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MNL, M4/PLATINUM SVC

1. 4 16 Figure 4 8 Adjustment Light Field Lamp 4 17 Figure 4 9 Check Light Field Edge Contrast 4 18 Figure 4 10 Check IRSD Shielding 4 22 Figure 4 11 Check Tubehead Shielding 4 23 Eu E 5 1 Figure 5 2 Operator Console Covers eene 5 Figure 5 3 Operator Console Covers Removal 5 2 Figure 5 4 Gantry Covers Remosval 5 3 Figure 5 5 Compression Device Covers Removal 5 4 Figure 5 6 Tube head Covers RemlOVal aca e enne aene enin 5 5 Figure 5 7 IRSD and IRSD Cover Remowval eene 5 6 5 7 gu PIE m 5 9 aux G nry DC Tu s OP 5 9 Figure 6 1 Operator Console Components 6 1 Figure 6 2 Console Keyboard kRemoval 6 2 M IV Figure 6 3 X ray and Compression Release Switch Board Removal 6 3 Figure 6 4 X ray and ON OFF Switch Board Remowval sss 6 4 Figure 6 5 Console Display amp Remowval eene 6 5 Figure
2. 2 A E I sn l n a a Hi HHHH eee EEE EES EOE ESP mR11 AL 0 0 1 0 2 0 3 0 4 0 5 0 6 Chapter 4 Performance Compliance Checks and Adjustment M IV 2 2 Reproducibility and Linearity Manual Mode Check The following test verifies that the x ray system including the controls and x ray tube is operating within the reproducibility and linear requirements of 21 CFR Failure to meet these performance stan dards indicates the need to check the calibration of the H V Generator or the x ray tube WARNING Observe all safety precautions while mak ing an X ray exposure 1 Connecta 10 cm radiation probe to dosimeter then set the meter to read mil liroentgens Position the meter so that it can be read from behind the radiation shield See Figure 4 2 2 Turn the unit ON select Manual collima tion and then illuminate the light field Limit the field to the approximate size of the probe then center the probe s detector in the x ray field Align the surface of the probe so that it is perpendicular to the beam axis 3 Setthe unit for a Manual mode exposure at 25 kV 60 mAs Large focal spot Select the molybdenum filter Mo and make an expo sure Record the milliroentgen reading on the Reproducibility Worksheet Table 4 2
3. 9 19 Bucky Interface Board Test Point Voltages 8 19 Accessory Sensor Combinations 0 23 Image Receptor Sensor Combinations 0 23 Remote Console Replacement Parts 9 1 CB Replacement PariS 9 2 9 3 9 4 6 Service Manual IV Service Manual Preface 1 0 Using the Service Manual The first four chapters of this service manual are designed to provide a service representative with a sequence for setting up and calibrating the M IV The remaining chapters detail the maintenance procedures General description of the contents of each chapter is as follows Chapter 1 General Information Contains general system descriptions x ray electrical and mechanical safety precautions and compliance information Chapter 2 System Installation Contains information for unpacking positioning and installing the unit Attaching the interconnections mounting the accessories connecting to power and the power up sequence are covered Chapter 3 System Setup Contains information on system setup switch settings and connections functional checks setting system defaults calibrating the exposure control system and final set up checks
4. 7 19 4 13 Power Distribution 7 19 5 0 Tests Adjustments and Calibrations 7 20 5 1 V Control Board Over Current Over Voltage Adjustment 7 20 5 2 Filament Control Board Over Current Over Voltage Adjustment 7 20 5 3 Rotation Angle 7 21 5 4 C Arm Switch Interlocks Verification 7 22 XII _ IV Service Manual Chapter 8 C arm Assembly Maintenance 1 0 Parts Identification 8 1 2 0 Remove and Replace Tubehead Components 8 3 2 1 Beam Limiting lt 8 3 nC CI cT 8 5 2 3 Tubehead Cooling 8 6 2 4 Filament Protection Board 8 6 2 5 Tubehead Switch Boards 8 7 2 6 Tubehead Microprocessor and Tubehead Motor Driver Board 8 8 3 0 Remove and Replace Compression Components 8 9 3 1 Compression Thickness 8 9 3 2 Upper and Lower Bellows Assemblies 8 10 3 3 Compression AEC Position Display Board 8 10 3 4 Compression Accessory Detect Board 8 11 3 5 Compression Clutch and Clutch Brake Assembly 8 12 3 6 Compression Motor and Motor 8 13 UNA uis C 8 13 4 0 R
5. 1 3 4 3 Mechanical Safety 1 3 4 4 Radiation Safety 1 4 T u u sees Cheese eta E 1 5 5 1 The Operator Console 1 5 5 2 The Gantry 1 6 6 0 Compliance 1 7 6 1 Responsibility 1 7 6 2 Compliance 5 1 7 6 3 Certifiable Components 1 8 6 4 Compliance and Identification Label Locations 1 8 vli M IV Chapter 2 System Installation 1 0 Unpacking The 2 1 1 1 Receiving 5 5 2 1 1 2 Un crating Gantry 2 1 1 3 Un crating Operator 5 2 2 1 4 Unpacking Accessories 2 2 2 0 Unit Installation 2 3 2 1 1 5 2 3 2 2 Installation Operator 2 4 2 3 Installation Footswitches 2 6 2 4 Installation Radiation Shield 2 7 2 5 Installation Bar Code 2 8 3 0 M IV
6. 8 8 Figure 8 10 Compression Timing 4 8 9 Figure 8 11 Compression Thickness Potentiometer Removal 8 9 Figure 8 12 Removing the Bellows 8 10 Figure 8 13 Compression AEC Position Display Board Remowval 8 10 Figure 8 14 Compression Accessory Detect Board Remowval 8 11 Figure 8 15 Compression Clutch and Clutch Brake Remowval 8 12 Figure 8 16 Compression Drive Assembly Removal 8 13 Fipure 9 17 Timing DelE R6ITIOVA 8 13 Figure 8 18 IRSD Components rear frame Removal 8 15 Figure 8 19 IRSD Components breast tray Removal 8 15 Figure 8 20 AEC Detect 1 8 16 Figure 8 21 Compression Chain Tension Adjustment 8 21 Figure A 1 M IV System Dimensions 2 IV Service Manual List of Tables Table P 1 List of Acronyms for M IV nnn XX Table 1 1 M IV Certifiable Components 1 8 Table 3 1 Remote Console Operator Microprocessor Board DIP Switch S1 3 1 Taple 3 2 3 2 Table 3
7. 3 24 5 0 Automatic Exposure Control Calibration 3 25 5 1 AEC Detector Gain Calibration 3 27 Del PEGA u s uruy ae sed 3 27 5 3 Preparation for Compression Thickness Threshold Adjustment 3 32 5 4 Reduced Large Spot mA Calibration 3 32 5 5 Compression Thickness Threshold Adjustment 3 32 5 6 HTC Filament Off Time Auto kV Calibration 3 33 5 7 Reduced mA Optical Density Offset Calibration 3 34 6 0 Download Calibration 3 34 7 0 Final Set Up Checks 3 35 7 1 AutoFilm ID Setup 3 35 7 2 Exposure Counter Reset 3 35 7 3 C arm Rotation Speed Check 3 35 7 4 Setting Compression Release Distance 3 36 7 5 Setting Auto Filter kV Threshold and Offset 3 36 IV Service Manual Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 1 2 0 X ray System Performance 4 2 2 1 Half Value Layer Check 4 2 2 2 Reproducibility and Linearity Manual Mode Check 4 5 2 3 Reproducibility Auto Time Mode Check 4 8 2 4 Reproducibility Auto kV Mode Check 4 9 2 5 Reproducibility Auto Filter Mode 4 9 3 0 X ray and
8. Always wear a grounded electrostatic dis charge strap when handling static sensitive 3 Remove three screws securing upper bel components lows assembly to C Arm sub fully remove assembly 1 Turn power OFF then remove the top Com pression Device cover as per Chapter 5 Fig ure 2 3 Use care not to damage the Compression Device bellows 4 Remove three screws securing lower bel lows assembly to bearing block assembly Carefully remove assembly 5 Reverse procedures to replace the bellows assemblies 2 Disconnect the cable connectors from the Compression AEC Position Display Board to be removed left or right 3 Remove the hardware that secures the Com pression AEC Position Display Board left or right to be removed to the standoffs on the top cover 4 Reverse these steps to install the replace ment display board Bellows Rods 5 Perform the Section 6 1 Compression Force Calibration procedures Figure 8 12 Removing the Bellows Rods Figure 8 13 Compression AEC Position Display Board Removal 8 10 Chapter 8 C arm Assembly Maintenance M IV 3 4 Compression Accessory Detect Board The Compression Accessory Detect Board Figure 8 14 has four sensors that detect the type of Compres sion Paddle installed on the Compression Device This board mounts to the bottom Compression Device frame near the front E Turn power OFF then r
9. 7 6 2 6 C arm Microprocessor Board 7 6 2 7 Host Microprocessor Board 7 7 2 8 Motor Lamp Control 7 7 2 9 Rotation Display 7 8 3 0 Gantry Frame Components Remove and Replace 7 9 3 1 VTA Motor Driver 7 9 3 2 C arm Rotation Drive Motor and Gearbox Assembly 7 10 3 3 C arm Vertical Drive Motor and Gearbox Assembly 7 11 3 4 C arm Rotation 7 12 3 5 Gantry Components Preventive Maintenance 7 13 AO ost VOWS Q maaa 7 14 4 1 High Voltage Inverter Board and High Voltage Multiplier Board 7 14 4 2 High Voltage Control 7 14 4 3 Filament Control 7 15 4 4 Generator Microprocessor Board 7 16 4 5 Rotor Control 7 16 4 6 Mains Power Board 7 17 4 7 C arm Microprocessor Board 7 17 4 8 Host Microprocessor Board 7 17 4 9 Motor Lamp Control 7 18 4 10 VTA Motor Driver 7 18 4 11 Rotation Display 7 18 4 12 15 V Power Supply
10. 3 Press Enter to complete the change Note The label DST season appears next to the Time data field during the daylight savings time season M IV 3 4 11 The Institution s name displays in the space at the top of each Mode Screen and is part of the AutoFilm ID label The Institution data field permits entry of up to 32 characters to identify the name of the host institution Use the Institution data field to enter or change the name of the institution clinic or hospi tal Institution Data field must be backspaced to clear old screen film information 3 4 12 Setting Address Data Field The Address data field permits entry of up to 32 characters to identify the address of the host institu tion This data is also part of the AutoFilm ID label Use the Address data field to enter or change the address of the institution clinic or hospital Address Data field must be backspaced to clear old screen film information 3 4 13 Setting lInstitution Data Field Setting Tech ID Cleared with Clear Key This data field permits the user to set the Clear Key so that is also removes the data from the Tech ID field when it is pressed The choices for this data field are Yes or No Service Manual 3 4 14 setting Auto ID Contrast Use this data field to change the contrast of the AutoFilm ID data when it is flashed onto the film Lower values decrease contrast while higher values Increase contrast 1 H
11. 8 Amp 250 V 5 8 Chapter 5 Covers Panels Fuses and Jumpers Service Manual lt F12 5 Amp SB Er eo gt o 00 amp Figure 5 10 Gantry D C Fuses N N 3 gt gt 53 ic o T Tl o o w 00 5 5 gt gt gt T o o 00 00 o 17 15 y F18 15 Amp FB 19 30 Q F20 30 Amp FB Figure 5 9 Gantry Fuses Chapter 5 Covers Panels Fuses and Jumpers 5 9 IV Service Manual 40 Jumpers Table 5 4 and 5 5 provide information regarding circuit board jumper settings Table 5 4 Circuit Board Jumper Settings CIRCUIT BOARD JUMPER JUMPER POSITION open JP 1 4 oins 1 and 2 all Table 5 5 Operator Microprocessor Jumper Settings JUMPER FUNCTION SETTING Not Used N A AutoFilm ID Tones 1 and 2 Hi 3 and 4 Med 5 and 6 Lo RIS Serial Protocol 1 and 2 422 2 and 3 232 1 and 2 Hi 3 and 4 Med 5 and 6 Lo Note Jumper pins are numbered left to right for horizontal orientation or top to bottom for ver tical orientation 5 10 Chapter 5 Covers Panels Fuses and Jumpers M IV Chapter 6 Operator Console Maintenance 10 Parts Identification Figure 6 1 shows the locations of the Operator Console components Legend for Figure 6 1 Keyboard X ray and ON
12. Filter kV 1 of 3 film screen combinations calibrated Molybdenum Mo or Rhodium Rh 25kV 26kV or 28kV Rh mAs Table not selectable Density 5 to 0 to 5 Spot Small Film 1 of 3 film screen combinations calibrated Auto kV Window 38mAs 50mAs 60mAs Auto In these instances and when the system is operating with an HTC Bucky the default kV is 25 kV 3 20 Chapter 3 System Setup Service Manual 4 0 Exposure System Calibration Use the following section to setup check and calibrate the M IV exposure generating system 4 1 Line Regulation Check 1 Turn the system OFF Place a true RMS AC voltmeter on L and N at the rear panel of the Gantry Turn the system ON then record the line voltage below 2 Select 32 kV 200 mAs then make an expo sure Record the line voltage below 3 Calculate the line regulation using the for mula below Verify that this value does not exceed 10 VNL VL VNL x 100 lt 10 4 2 Setting X ray Tube Type This procedure sets the Host for the type of x ray tube installed Perform this procedure as a preoper ational check or after replacing the x ray tube 1 Setthe M IV to the calibration mode S6 switch 4 2 ON Set the Host Microproces sor for the X ray Tube Selection mode S4 to position 1 S6 switch 8 2 ON 2 Determine the type of x ray tube installed on the M IV r
13. 2 9 3 1 Interconnections Gantry to 2 9 3 2 CONDECUNEIO POWC dtu eda gua awd oes 2 11 4 0 System Power UD done bh eben oho aes 2 12 VIII M IV Chapter 3 System Setup 1 0 Switches and Connections 3 1 1 1 Remote Console Switch Settings 3 1 1 2 Host Microprocessor Board Switch Settings 3 2 2 0 Functional 3 6 2 1 Functional Checks Compression System 3 6 2 2 Functional Checks C arm Movement System 3 6 2 3 Functional Checks Collimator Lamp Button 3 7 2 4 Functional Checks Collimator Override Switch 3 7 3 0 Setting System Defaults 3 8 3 1 Making Selections Entering 3 10 3 2 The Default 3 10 3 3 Setting Defaults Setup Mode Screen 3 13 3 4 Default Settings Additional Setup Mode Screen 3 16 4 0 Exposure System 3 21 4 1 Line Regulation 3 21 4 2 Setting X ray Tube 3 21 4 3 Tube Bias Adjustment 3 21 4 4 Tube Current mA Adjustment 3 22 4 5 Tube Voltage Potential KV Adjustment
14. 4 Change the exposure techniques for both kV and mAs then return them to 25 kV and 60 mAs Again make an exposure and record the milliroentgen reading on the Reproducibility Worksheet 5 Continue to randomly change the technique data for kV and mAs and return them to 25 kV and 60 mAs Make exposures in this manner until 10 individual exposure are made Record each milliroentgen reading on the Reproducibility Worksheet Chapter 4 Performance Compliance Checks and Adjustment Procedures Service Manual Compute and record the average milliroent gen reading on the Reproducibility Work sheet Subtract each actual reading from the average and square each difference Add the squares and divide the sum by 9 Then take the square root of the result Divide the number calculated in Step 6 by the average milliroentgen reading to obtain the coefficient of variation The coefficient of variation must be less than 0 05 Leave the configuration on the IRSD the same Change the exposure data to 25 kV and 20 mAs Make an exposure and record the milliroentgen reading on the Linearity Worksheet Table 4 3 Figure 4 2 Setup Reproducibility and Linearity Check Repeat Step 8 changing the mAs to 60 100 150 200 250 300 400 and 500 for each exposure Record milliroentgen read ings at each setting on the Linearity Work sheet 4 5 Sen eA 1 1 1u uinoop Ja1eJnooe eorues eu
15. 5 6 Chapter 5 Covers Panels Fuses and Jumpers IV Service Manual 3 0 Fuses This sections provides information regarding system fuses their locations and their ratings 3 1 Fuses Operator Console Figure 5 8 shows the fuses in the Operator Console These fuses are attached to the components panel which is accessed by removing the front cover of the Operator Console Table 5 1 provides each fuse rating and cir cuit Table 5 1 Operator Console Fuse Matrix FUSE RATING CIRCUIT Operator Microprocessor Operator Microprocessor NENNEN Figure 5 8 Console Fuses 3 2 AC Fuses Gantry Figure 5 9 shows the AC fuses on the Fuse Board The Fuse Board is attached to the Gantry frame and is accessed by opening the right side Gantry door Table 5 2 provides each fuse rating and circuit 3 3 DC Fuses Gantry Figure 5 10 shows the D C rail fuses These fuses are attached to a fuse panel which is accessed by opening the left side Gantry door Table 5 3 provides each fuse rating and circuit Chapter 5 Covers Panels Fuses and Jumpers EFA Service Manual Table 5 2 Gantry A C Fuses RATING CIRCUIT 90 VDC 90 VDC 120 VAC Console LVPS 120 VAC Console LVPS 24 VAC Motor Control 24 VAC Motor Control 28 VDC 28 VDC Filament Filament AEC Bucky AEC Bucky 15 VDC 15 VDC 10 VDC 10 VDC 525 VDC 525 VDC 325 VDC F20 30 Amp SB 600 V 325 VDC RATING
16. 21 225 295 Monitor the angle display and continue clockwise the Rotation Limit Switch should engage and shut the unit off before the angle display reads 183 198 15 If it does not adjust the rotation limit switch as follows e Rotate C arm to 4182 197 15 e Manually adjust the rotation limit switch until the Detent arm on the side of the switch is positioned within the detent slot on the side of the pivot tube it may be necessary to loosen the two screws on the face of the limit switch and or the top and bottom adjustment screws on the limit switch mounting plate in order to adjust the switch e The M IV will shut off when the detent arm is positioned within the detent slot on the pivot tube Manually close the rotation limit switch to return power to the M IV Holding the protractor against the side of the C arm rotate the C arm until the pro tractor display reads 0 Press S1 on the Host Microprocessor Board to zero the rotation angle display and save the C arm position to memory Rotate the C arm to 90 and cycle through the collimator sizes to verify no binding occurs Repeat at 90 Rotate the C arm to 4 180 and verify the angle indication is correct Verify the C arm can be moved through a minimum travel of 150 2 1 to 195 1 0 Return C arm to the 0 position Verify Rotation Memory WARNING Observe all safety procedures while making an X ray exposure
17. 4 4 Generator Microprocessor Board Service Manual Table 7 5 shows the test points and their voltages or signals on the Generator Microprocessor Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 5 Generator Microprocessor Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND 1 DGND TP3 5V TP1 2 1 1 4 5 Rotor Control Board Table 7 6 shows the test points and their voltages or signals on the Rotor Control Board When taking mea surements connect the voltmeter ground appropriately according to the table below Table 7 6 Rotor Control Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 1 TP7 TP2 IE TP3 TP7 4 TP7 5 TP6 TP6 N A 7 N A TP8 TP9 ul N A RPM 5V N A COM N A 7 16 Chapter 7 Gantry Maintenance M IV 4 6 Mains Power Board Tables 7 7 and 7 8 show the test points and their voltages or signals or the resistance on the Mains Power Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 7 Mains Power Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND 1 TPS TP2 TP6 TPS TP8 TP8 Table 7 8 Switch Test Points TEST POINT RESISTANCE GROUND TP3 Less than 50 TP8 TP4 Less than 50 TP8 TP5 Less than 50 TP8 4 7 C arm Microprocessor B
18. Chapter 4 Performance Compliance Checks and Adjustment Procedures Contains the procedures that verify system compliance including performance checks for the x ray tube the automatic exposure control system and the x ray field Chapter 5 Covers Panels Fuses and Jumpers Contains information detailing the removal of the unit s covers and panels the locations and ratings of the fuses used on the system and the jumper settings for each of the circuit boards Chapter 6 Operator Console Maintenance Contains the information necessary to repair and adjust the various assemblies and subsections of the Opera tor Console Chapter 7 Gantry Maintenance This section provides the information necessary to repair and adjust the various assemblies and subsections on the Gantry including the x ray generation system and the C arm movement system Chapter 8 C arm Assembly Maintenance This section provides the information necessary to repair and adjust the various assemblies and subsections of the M IV C arm including the beam limiting assembly the compression assembly and the image receptor support assembly Chapter 9 Parts List Contains tabular listings of the replacement parts for the M IV Mammography System Appendix A Specifications Contains system specifications including performance specifications x ray tube and exposure specifications compression specifications and beam limiting specifications Preface xix
19. Drive Mount Drive Slot Floppy Disk Drive Figure 6 7 Floppy Disk Drive Removal 6 7 _ IV Service Manual 27 Operator Interface Microproces 6 Verify that the display works Check that sor Board the display presentation is crisp and bright and that the text and graphics are clear leg The Operator Microprocessor Board mounts to ible and not blurred standoffs in the front component compartment of the 7 Set unit for a short exposure 25 kV 3 mAs Operator Console Access the circuit board by Manual Mode Large Focal Spot press both removing the front cabinet panel poe X ray switches and verify proper switch operation 8 Remove the cassette from the Bucky The Operator Interface Microprocessor then insert it in the AutoFilm ID to flash the contains data storage components that are data onto the film Develop the film and sensitive to electromagnetic fields NEVER verify the flashed data for accuracy place items with a magnetic charge or items that produce an electromagnetic field on or near the Operator Interface Microprocessor 1 Remove the Front Cabinet Panel from the Console as per Chapter 5 Section 5 2 1 Steps 1 through 5 2 Remove all cables and cords from their respective connectors on the microproces sor board Note all cable and cord loca tions 3 Remove the hardware that secures the Operator Interface Microprocessor to the
20. X2 is less than or equal to 0 10 X1 X2 where X1 and X2 are average mR mAs values for consecutive exposures 21 CFR kV Accuracy Within 1 kV of the indicated kV level mAs Accuracy 5 or 2mAs whichever is greater from indicated measured in the ground side of the tube circuit Post mAs Accuracy 5 or 2mAs whichever is greater from actual mAs mA Accuracy The actual value will not differ by more than 5 for the indicated value 14 Image Receptors Standard Types 18 x 24 cm Full pass Linear Bucky 24 x 30 cm Full pass Linear Bucky 18 x 24 cm HTC Bucky 24 x 30 cm HTC Bucky StereoLoc II DSM Magnification Table M IV 1 15 Automatic Exposure Control A 8 AEC Specifications AEC Detector Solid state three square centimeter active sensing area The detector is centered later ally in the Image Receptor Support Device and may be moved forward or rearward to one of 7 detent locations The detent posi tion of the AEC sensor will be displayed on the corresponding LED on the AEC Position Indicator and its position is indicated on the AutoFilm ID marker Detents are provided in 1 7 cm increments AEC kV and Thickness Tracking AEC compensates for kV between 20 kV and 39 kV as well as for breast thickness tracking including different breast composi tions Optical density is within 0 12 OD from the mean optical density value at any point within the clinically defined range of kVs fo
21. ON 2 Set the Rotary Switch for the Rotation and Vertical Speed Controls mode S4 to posi tion 5 S6 switch 8 ON 3 On the Host Microprocessor press Select S2 until the desired category displays i e Rotation or Vertical Speed then press 53 to decrease the speed or 55 to increase the speed 4 Set the Host Microprocessor for normal operation S6 switch 4 OFF 5 Turn the M IV OFF wait a few seconds then switch the unit back ON to have the desired change take effect M IV 7 4 Setting Compression Release Distance The Compression Release Distance is factory set at 10 cm If the need arises to change it the service engineer has additional options for either 5 cm 7 5 cm or 12 5 cm settings The procedure to change the recommended setting is as follows 1 Setthe Host Microprocessor to the calibra tion mode S6 switch 4 2 ON 2 Setthe Rotary Switch for the Compression Release Distance mode S4 to position 7 S6 switch 8 ON 3 On the Host Microprocessor press Select 52 until the desired setting appears 5 cm 7 5 cm 10 cm or 12 5 cm 4 Setthe Host Microprocessor for normal operation S6 switch 4 OFF 5 Turn the M IV OFF wait a few seconds then switch the unit back ON to have the desired change take effect 3 30 Service Manual 7 5 Setting Auto Filter kV Thresh old and Offset The Auto Filter kV Threshold and the Auto Filter kV Offset selection for the Rhodium f
22. Radiation Safety The radiation safety of the unit complies with all requirements of 21 CFR Part 1020 and complies with IEC 601 The operator control panel contains two x ray expo sure buttons which must be pressed simultaneously for the entire duration of the exposure and released before initiating another exposure An audible tone will sound for the entire time x rays are produced The exposure duration is controlled by the following normal conditions The X ray exposure switches must be held continuously By the microprocessor pre set back up time By an independent safety hardware back up timer By detection of a generator fault The control electronics prevent the unit from initiat ing an X ray exposure unless The cassette is installed with Bucky use The room door interlock is closed The X ray exposure footswitch interlock is closed NYC requirement Two X ray switches must be activated simul taneously The radiation shield provides a minimum of 0 5 mm of lead equivalent attenuation at 35 kV Chapter 1 General Information Service Manual M IV 5 0 Unit Layout Service Manual The M IV Mammography Unit consists of three major assemblies e the Operator Console e Gantry e the C arm 51 Operator Console The Operator Console controls x ray exposures through the operator interface Flat Panel Display screen and keyboard on the Console Data and technique inputs are m
23. 24 25 26 Remove the HV cable from the High Volt age Multiplier test well Rotate the C arm to 63 and release a large focal spot 20 kV 3 mAs exposure Rotate the C arm to 63 and verify the soft ware initiated detent pause 7 21 5 4 C Arm Switch Interlocks Verifi cation The following procedures verify that the switch sens ing circuits of the Motor Lamp Control Board are functioning The first test checks that the system senses a stuck switch upon initial power up the sec ond test checks that C arm motion is prevented if a movement switch is held during an exposure 5 4 1 Switch Interlock Power Up Check 1 Turn the unit OFF 2 Have an assistant hold the COMPRESSION UP button on the M IV C arm 3 With the switch held apply power and enter the Run Mode Verify that the system displays a Motion Error 63 4 Release the switch and clear the error press reset 5 Repeat steps 1 through 4 for the following C arm switches and verify the proper motion error e Compression Down Motion Error 64 e C arm Up Motion Error 66 e C arm Down Motion Error 67 e C arm Rotation Motion Error 61 e C arm Rotation CCW Motion Error 60 7 22 Service Manual 5 4 2 Switch Interlock Exposure Check Set the system for a Manual Mode exposure at 22 kV 160 mAs Move the footswitch so that it can be depressed from behind the Operator Console Press and hold both X ray But
24. Appendix A Specifications 1 0 M IV Series System A 1 1 1 Electrical Input Specifications A 1 1 2 Operating 1 1 3 Storage ENVINONIMNCN IR aee d 1 Td Umit MOSSUPemmTe De secate kaga 2 1 5 C arm 5 A 3 1 6 Compression Specifications A 3 1 7 X ray Tube 5 5 A 5 1 8 X ray Tube Housing Specifications A 5 1 9 X ray Beam Filtration and Output Specifications 5 1 10 X ray A 6 1 11 Light Field Specifications A 6 1 12 High Voltage Generator Specifications 6 1 13 Accuracy Reproducibility and Linearity Specifications A 7 bel Oe RECODO e rmm A 7 1 15 Automatic Exposure Control AEC Specifications A 8 XIV IV Service Manual List of Figures Figure 1 1 M IV Operator Console Components 1 5 Figure 1 2 M IV Gantry and 1 6 eo Tanel OC rere ee terete 1 9 Fipure2 1 Un cratng TE 2 2 2 3 Figure 2 3 Installation Operator Console esee 2 4
25. Compression Thickness Potentiome 10 11 12 13 ter Removal De solder the three wires connections white red and black from the posts on the potentiometer Note the color wire for each post Reverse steps 3 through 7 to install the replacement potentiometer Perform the Section 6 4 Compression Thickness Potentiometer Mechanical Adjustment procedures Replace the lower bellows assembly Replace the compression device assembly upper and lower covers Perform the Section 6 1 Compression Force Calibration procedures Perform the Section 6 2 Compression Thickness Potentiometer Calibration proce dures 8 9 IV Service Manual 3 2 Upper and Lower Bellows 3 3 Compression AEC Position Dis Assemblies play Board 1 Remove IRSD as per Chapter 5 section 2 5 The Compression AEC Position Display Boards left Image Receptor Support Device IRSD Cov right see Figure 8 13 provide readouts for com ers Steps 1 and 2 pression thickness compression force and the posi 2 Unscrew and remove two bellows rods tion of the AEC Sensor Board These display boards Refer to Figure 8 12 mount to the inside of the top Compression Device cover Note To access the bellows screws for both upper and lower pull cover and CAUTION bellows away from C Arm easily Be aware of the damage static electricity ensure bellows clears sub frame can inflict on electronic components GR LL LL ILLI
26. High Voltage Transformer Part of High Volt age Generator Assy 3 High Voltage Multiplier Board Part of High Voltage Generator Assy 4 High Voltage Inverter Board Part of High Voltage Generator Assy 5 High Voltage Control Board Part of High Voltage Generator Assy 6 Generator Microprocessor Board 7 Filament Control Board 8 Rotor Control Board 9 Mains Power Board 10 C arm Microprocessor Board 11 Host Microprocessor Board 12 Motor Lamp Control Board 13 Fuse Panel 2 14 VTA Motor Driver Board 15 Power Distribution Board 16 Isolation Transformer 17 Power Supply Interconnect Board 18 15 V Power Supply Board StereoLoc II only 13 19 Pivot FRONT VIEW Doors Open Figure 7 1 Gantry Circuit Boards Chapter 7 Gantry Maintenance 7 1 2 M IV Legend for Figure 7 2 1 O C C arm Rotation Drive Motor and Gearbox Assembly C arm Vertical Drive Motor and Gearbox Assembly C arm Rotation Potentiometer C arm UP DOWN Limit Switches C arm Rotation Limit Switch Lead Screw Service Manual GANTRY REAR VIEW Figure 7 2 Gantry Mechanical Components Chapter 7 Gantry Maintenance M IV 2 0 Gantry Door Components Remove and Replace Before performing any remove and replace procedure ensure that all electrical safety precautions are met Service Manual Power down the unit set the input power circuit breaker to OFF then disengage
27. Liftthe radiation shield and place it on the support shelf attached to the front shield support with the LORAD logo facing the patient 4 Align the holes in the shield with the threaded holes in the front support 5 Position the protective plates 2 over the shield mounting holes 6 Secure the plates and the shield to the front shield support using the four bolts supplied See Figure 2 6 Installation Radiation Shield 7 Position the hooks on the rear shield sup port so that they align with the slots in the front shield support 8 Insert the hooks into the slots then slide the rear support down to secure in place 9 Mount the front and rear fascia strips onto the shield support as shown Note The fascia strips are self adhesive and are used to cover the gap between the shield and the shield support Chapter 2 System Installation Service Manual Figure 2 6 Installation Radiation Shield 2 IV Service Manual 2 5 Installation Bar Code Reader 5 Position the Utility Shelf so that the three 3 screws align with the mounting holes in the side of the Control Console Tighten each screw to secure the shelf and mounting plate This procedure details installing the optional Bar Code Reader Wand and the Utility Shelf Note that this procedure is only valid for units that are shipped Bar Code Reader ready Refer to Figure 2 7 throughout the following 6 Replace the previous
28. Movement controls on both sides of C arm and on footswitch Alignment of Focal Spot Compression Device and Image Receptor The focal spot of the x ray tube is located so that the ray falling on the edge of the image receptor closest to the chest wall is perpen dicular to the image receptor The system allows the plane formed by the focal spot and the chest wall of the device to be per pendicular to that ray and motion of the compression device provides parallel com pression of the breast with respect to the plane of the image receptor The compres sion paddle is adjustable chest wall to nip ple to provide for this alignment requirement MQSA Source to Image Distance SID 65 cm from the nominal position of the Large Focal Spot to the image receptor film within the Bucky Magnification 1 8x for objects 22 5 mm above the magni fication stand breast support surface breast support surface is at approximately 1 7x This provides a balance between resolution signal to noise and scatter reduction The breast support surface material is made up of carbon fiber The magnification table is constructed as a tower to provide rigidity 1 6 Service Manual Image Receptor Support Device The Image Receptor Support Device IRSD is removable from the C Arm There is an electrical interlock to prevent X ray expo sure when removed The IRSD houses the 3 cell AEC detector movable to 7 positions The IRSD limits the
29. Press the lt ENTER gt or DOWN ARROWS key to save the entry and READY MANUAL mode filter Lage Kodak density spot film Institution Name Full Compression Force 80 Compression Release MANUAL Collimator AUTOMATIC Default Exposure Mode MANUAL Pre Compression Force 50 Printer OFF Auto ID Tube black on white Cassette Sense ON Retain patient data for 5 days Setup Options Additional Setup Default Magnification Mode MANUAL View Reminder OFF mAs Table 1 Set Pre Compression Force limit using the CHANGE key to view and select the available limits from 10 to 100 of the range of 15 to 30 16 or 66 75 to 133 5 Press the ENTER or DOWN ARROW key to proceed to the next field Perss SETUP the lt SETUP RUN gt key to retun to the Run Mode Kodak MANUAL Mo filter Large spot film mode density Institution Name 06 25 1998 Thursday 2 43p m DST season Institution Address Institution Address Tech ID field cleared with Clear Key Auto ID Contrast Auto ID Offset Daylight Savings Time Enabled NEWTONS Date RIS NOT Attached Flash time 1 Flash time 2 Flash Time 3 Use the CHANGE keyto view the options Select Compression Force Units of either LBS or NEWTONS Press the ENTER or DOWN ARROW key to proceed to the next field Press the lt SETUP RUN gt key to return to the Setup Mode ADDITIONA
30. focal spot at 10 X ray tube angle at 6 to provide 22 Large and 16 Small anode to film plane angle Provides film coverage of 24 x 30 cm for Large Focal Spot and 18 x 24 cm for Small Focal Spot magnification Anode Material Molybdenum X ray Window Beryllium 0 8 mm thickness maximum Beam Quality for Mo Mo and Mo Rh Operation Service Manual X ray Tube Housing Specifica tions Over Temperature Protection Sensor Internally connected in series with the stator common lead Maximum Temperature Tube Housing Surface 55 C Maximum Temperature Tube Head Cover Sur face 41 C Safety Class IEC 601 2 8 Class 1 IEC 601 2 8 X ray Beam Filtration and Output Specifications Inherent Tube Filtration 0 0 mm Al equivalent Added Filtration 2 position filter changer mechanism that houses a 25 micron 0 025 mm Molybde num foil filter and a 25 micron 0 025 mm Rhodium filter The filters are placed at a 22 angle which provides an effective 27 5 micron thickness Filter is user selectable in all exposure modes except Auto Filter Mode where it is selected automatically HALF VALUE LAYER Must use type 1145 aluminum 99 9 pure All units are in millimeters of aluminum Target Filter Combination Minimum HVL Maximum HVL Mo Mo kV 100 0 03 kV 100 0 12 with compression paddle in place Mo Rh kV 100 0 03 kV 100 0 19 with compression paddle in place Mo Mo kV 100 without compression paddle in pla
31. then develop the films 6 Check the 24 x 30 cm film on each of the non chest wall edges for white space The x ray field at each of these edges MUST NOT exceed the film edge 0 mm but must be within 1 of SID 6 5 mm from each edge Chapter 4 Performance Compliance Checks and Adjustment M IV 7 If any adjustments are necessary first note the distances required to correct each edge then press S2 lt Select gt until the desired col limator blade value displays i e rr 2222 24 x 30 x ray field Large focus rear blade See Table 4 4 for all collimator blade settings 8 Press 55 lt increase gt or 53 lt decrease gt on the Host to change the value for the selected collimator blade Note that 10 increments on the display equals approxi mately 1 mm movement at the film plane for the adjusted blade 9 Perform the adjustment for each edge requiring change then repeat the verifica tion exposure Check both films to ensure that each edge falls within specifications Repeat the adjustments and verification films as necessary for the 24 x 30 cm field format Note The front collimator blade value will remain the same for all subsequent large focus x ray field formats There fore enter the 24 x 30 cm front colli mator blade value for the remaining large focal spot field sizes 10 Remove the 24 x 30 cm Bucky device and replace it with a loaded 18 x 24 cm Bucky device Place a loaded 18 x 24 cm cas
32. 15 Power Distribution Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 525V 28V 32VAC 20V TP 11 DGND gt j 16V 40V Chapter 7 Gantry Maintenance 7 19 Service Manual 5 0 Tests Adjustments and Calibrations This section covers voltage tests mechanical adjustments and calibrations for the components in the M IV Gantry 5 1 Control Board Over Current Over Voltage Adjustment The following outlines maintenance procedures checks and adjustments for the High Voltage Con trol Board CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 1 Turn power ON On the High Voltage Con trol Board connect a voltmeter to TP8 and TP24 2 Check that the Small spot over current read ing matches the value in Table 7 3 Make the proper potentiometer adjustment as required 3 Connecta voltmeter to TP9 and TP24 Check that the Large spot over current read ing matches the value in Table 7 3 Make the proper potentiometer adjustment as required 4 Connect a voltmeter to TP2 and TP24 Check that the inverter over current reading matches the value in Table 7 3 Make the proper potentiometer adjustment as required 5 Connect a voltmeter to TP1 and TP24 Check tha
33. 2 Small 18 x24 1 Large 18 x 24 X L 13 Small 15 x 15 Large 15 x 15 li4 Small 10 10 3 Large 10 x 10 X L11 Small 18 x 24 Large 6 x 7 5 3 The X ray field must be adjusted to fall within the 5 mm guidelines portrayed on the template for the X ray size being cali brated 4 After completing the calibration remove the template and install a Bucky assembly with the appropriate image receptor cassette installed 5 Setthe system for Manual 22 kV 16 mAs exposures 6 Expose and develop X ray films for each required spot size and collimator opening Measure the films in accordance with the X ray field size Record the actual values in Table 4 5 Chapter 4 Performance Compliance Checks and Adjustment IV Service Manual Table 4 5 X ray Field Adjustment Small Focal Spot HOST DISPLAY SELECTED FIELD SIZE FOCALSPOT BLADE ADJUSTMENT FINAL VALUE Rear Blade light field Left Blade light field 18x24cm Field SmallSpot Right Blade light field 18x24cm Field SmallSpot Front Blade light field __ 7m 18x24cm Field SmallSpot Rear Blade light field __ Left Blade light field ws 7rm 18 24 SmallSpot Right Blade light field Front Blade light field Ore d5x15cm Field Small Spot Blade lightfield bee l5x15cm Fild Sp
34. 2 1 Disconnect the Console Display ribbon cable from TJ28 on the Operator Interface Microprocessor Item 4 Figure 6 1 in the front component compartment Disconnect the backlight connector from TJ27 on the Operator Interface Micropro cessor Item 4 Figure 6 1 in the front com ponent compartment Disconnect the Keyboard LED Item 11 Fig ure 6 1 cable from P4 part of the sub panel cable harness in the front component com partment Remove the hardware that fastens the Dis play mount to the console frame see Figure 6 5 Lift the Display and mount out of the console Carefully pull the cable s up and out of the console Disconnect the ground wire from the mount Remove the hardware that fastens the Dis play to the mount Install the replacement Display onto the mount then attach the ground wire Route the Console Display cable s through the slot in the console top shelf Connect the Console Display ribbon cable to TJ28 on the Operator Interface Microprocessor then connect the backlight connector to TJ27 on the Operator Interface Microprocessor Chapter 6 Operator Console Maintenance 10 11 12 Service Manual Connect the Keyboard LED cable to P4 part of the sub panel cable harness in the front component compartment Align the holes in the Display and mount with the holes in the console frame Install and tighten the mounting hardware Apply power to the system and verify that t
35. 4 25 Service Manual 4266 Chapter 4 Performance Compliance Checks and Adjustment Service Manual M IV Chapter 5 Covers Panels Fuses and Jumpers 1 0 Parts Identification Figures 5 1 and 5 2 show the locations of the covers and panels on the Gantry and the Operator Console Legend for Figure 5 1 Legend for Figure 5 2 Gantry Door Left Side 1 Radiation Shield Gantry Door Right Side 2 Operator Control Panel Front Cover Left Side 3 Front Cabinet Panel Front Cover Right Side VTA Vertical Travel Assembly Frame Upper Rear Panel Lower Rear Panel Upper Tubehead Cover Lower Tubehead Cover Upper Compression Device Cover ON BW Lower Compression Device cover FRONT VIEW Figure 5 2 Operator Console Covers REAR VIEW Figure 5 1 Gantry Covers Chapter 5 Covers Panels Fuses and Jumpers Ss M IV 2 0 Remove and Replace Covers Service Manual The following paragraphs detail the cover removal procedures for the Operator Console the Gantry and the C arm Note that instructions for removing the Radiation Shield covers are detailed in Section 2 2 1 Operator Console Covers WARNING Always remove power before performing any removal or replacement procedure Access to the serviceable components and assem blies of the Operator Console are through these cov ers e Operator Control Panel Item 1 Figure 5 3 e Front Cabin
36. 5 Section 5 2 1 Steps 6 through 10 Turn the Control Panel over to access the Keyboard Refer to Figure 6 2 2 Disconnect the Keyboard cable from the Operator Microprocessor TJ29 Note that it will be necessary to remove the front cab inet panel to access the Operator Micropro cessor 3 For units with the optional Bar Code Reader disconnect the Keyboard cable from the Bar Code Reader Module keyboard jack The Figure 6 2 Console Keyboard Removal module is in the Console top shelf structure behind the AutoFilm ID assembly 4 Remove the ground wire from the Keyboard mount chassis Remove all mounting hard ware then lift the mounting chassis and keyboard off of the Control Panel 5 Reverse this procedure to install the replacement keyboard Note BE SURE to reconnect the ground wire before replacing the Control Panel 6 2 Chapter 6 Operator Console Maintenance M IV 2 2 X ray and Compression Release Switch Board Right Side The system incorporates two x ray switch boards one on the left side of the control panel and one on the right side The x ray switch board on the right side also contains the Compression Release switch 1 Remove the Operator Console Control Panel as per Chapter 5 Section 5 2 1 Turn the Control Panel over to access the switch board Refer to Figure 6 3 Remove the cables from connectors UJ1 compression release and UJ2 X ray Remove the hardware that mounts th
37. C arm Components M IV 6 0 Compliance Data Service Manual The following section details the M IV compliance requirements and the manufacturer s responsibilities 6 1 Responsibility Statement LORAD is responsible for the effects of reliability and performance of this equipment with the follow ing provisions The electrical installation of the room com plies with the appropriate requirements The equipment is used in accordance with instructions for use To ensure safe operation assembly opera tions extensions readjustments modifica tions or repairs must be performed by authorized persons only Chapter 1 General Information 6 2 Compliance Statement The manufacturer of this device complied with the following requirements applicable at the time of manufacture e 50 9001 e SO 13485 e EN 46001 FDA Quality System Regulation QSR 21 CFR 820 The system is designed tested and classified to comply with the following requirements IEC 601 1 IEC 601 2 7 IEC 601 2 32 IEC 601 1 2 IEC 601 2 28 IEC 601 2 45 EMC Directive Medical Device Directive UL 2601 CSA 22 2 No 601 1 21 CFR Subchapter J IVI IV Service Manual Certifiable Components These components are identified using individual serial numbers refer to Table 1 1 Table 1 1 M IV Certifiable Components messes mr mms masm _ Wise 2 Acn _ IMPORTANT When replacing a certified component
38. Drive Assembly 1 8 20 Apply power to the M IV then rotate the C arm to the degree position Set the M IV for the Calibration Mode S6 switch 4 ON Set the Host for the Com pression Height and Force Calibration 54 5 S6 switch 8 OFF Toggle Switch S2 until the Host Board Display reads C20f Install an 18 x 24 cm Bucky on the IRSD Place a force gauge in the approximate cen ter and cover with a folded towel for absorption Install the 18 x 24 cm Compression Paddle onto the Compression Device Manually apply compression onto the towel and gauge until the gauge display indicates 20 pounds of force Press Switch S1 on the Host Microproces sor to record the setting to memory Toggle Switch 52 until the Host Board Display reads C40f Manually apply compression onto the towel and gauge until the gauge display indicates 40 pounds of force Press Switch S1 on the Host board to save the setting Set the system back for normal operation Apply compression onto the force gauge and compare the force gauge reading with the Compression Force Display on the Com pression Device The readings should match within 4 5 pounds 20 Release the gauge from compression then repeat step 7 with the C arm rotated first 90 and then rotated 180 6 2 Compression Thickness Potenti ometer Calibration Perform this calibration procedure after servicing or replacing the Compression Thickness Potenti
39. ENTER key or by pressing TAB Note however that some entries are not complete recorded until the ENTER key is pressed M IV 3 1 Making Selections Entering Data Note There are some data fields in the RUN MODE that require an entry before the highlight can be moved from that field Once a data field is selected highlighted the required data is either manually entered using the alphanu meric keys i e ID NAME etc or selected from the available choices using the CHANGE key i e COM PRESSION data field Also the CPT CODE key and the VIEW key change the selection for their corresponding data fields CPT CODE and EXAM VIEW Exposure techniques are selected using the corre sponding Exposure Technique select keys 3 2 Default Worksheet Use the Default Worksheets Tables 3 7 3 8 and 3 9 to record the system defaults and the exposure tech niques typically used by the customer Inquire as to the users preferences prior to making changes in the Setup Mode This worksheet also provides an area for recording label information i e Institution name and Film Type etc Table 3 7 Setup Mode Default Worksheet Data Field Available Choices User Preference Default Magnification Mode mAs Table manual amp mag manual 1 coarse modes 2 fine Printer ON or OFF Auto ID Tube Side black on white Emulsion Side black on white Tube Side white on black Emulsion Side white on black OFF Casset
40. Figure 2 4 Installation Console Display 2 5 Ligure 255 Footswitch COnnechoNS 2 6 Figure 2 6 Installation Radiation Shield 2 7 Figure 2 7 Installing tbe Bar Code Reader 2 8 Feur 2 0 COMING C u uyu uuu 2 10 Figure 2 9 Input Power Configuration 2 11 Ip ure po toi O iris Sir f tu edu 2 12 Figure 3 1 Host Microprocessor Switches eee 3 1 sore e 3 7 B10 TENHA 3 8 Figure 3 4 Operator Console 3 9 Figure 3 5 Waveforms Patterns 3 23 Figure 3 6 Test Well and Banana Jack High Voltage Inverter 3 24 7 ID Ec P 3 35 Figure 4 1 Half Value Layer Setup 4 2 Figure 4 2 Setup Reproducibility and Linearity Check 4 5 picure 4 3 Field Size Poire m 4 10 Figure 4 4 X ray Field Size 18 x 24 cm 4 11 Figure 4 5 X ray Field Size 15 cm 10 cm and 7 5 cm Formats 4 12 Figure 4 6 Probe Locations Light Field 4 16 Figure 4 7 Adjustment Light Field Illluminance
41. HTC Grids and with HTC Grids only Chapter 3 System Setup 3 25 IV x Service Manual Table 3 15 AEC Calibration Procedures Linear Grids Only Linear HTC Grids HTC Grids Only Section 5 1 AEC Detector Section 5 1 AEC Detector Gain Section 5 1 AEC Detector Gain Gain Calibration Calibration Calibration Section 5 2 AEC Calibration Section 5 2 AEC Calibration Section 5 3 Preparation for Compression Thickness Thresh old Adjustment Section 5 3 Preparation for Section 5 4 Reduced Large Compression Thickness Thresh Spot mA Calibration old Adjustment Section 5 4 Reduced Large Section 5 2 AEC Calibration Spot mA Calibration Section 5 5 Compression Section 5 5 Compression Thickness Threshold Adjust Thickness Threshold Adjust ment ment Section 5 6 HTC Filament Off Section 5 6 HTC Filament Off Time Auto kV Calibration Time Auto kV Calibration Section 5 7 Reduced mA Opti Section 5 7 Reduced mA Opti cal Density Offset Calibration cal Density Offset Calibration 3 26 Chapter 3 System Setup M IV 5 1 AEC Detector Gain Calibration 1 Remove the IRSD cover as per Chapter 5 Section 2 5 Steps 1 through 6 2 Install the IRSD on the C arm cover removed 3 Install an M IV Bucky Linear or HTC on the IRSD Install a loaded cassette Center 2 cm of B E M on the surface of the Bucky so that it covers the AEC detectors and extends beyond the chest wall edge 4
42. Half value 4 4 Table 4 2 Reproducibility Worksheet 4 6 Table 4 3 4 7 Table 4 4 X ray Field Adjustment Matrix Large Focal Spot 4 13 Table 4 5 X ray Field Adjustment Small Focal 4 15 Emor COC 4 24 Table 4 6 Error Codes Continued obe REP II ceu heads 4 25 Table 5 1 Operator Console Fuse MatriXx 5 7 IE 0 2 Ga 5 8 5 8 Table 5 4 Circuit Board Jumper Settings 5 10 Table 5 5 Operator Microprocessor Jumper Settings 5 10 Table 6 1 Test Point Voltage Matrix 6 10 Table 7 1 High Voltage Inverter Board Test Point Voltages 7 14 Table 7 2 High Voltage Control Board Test Point Voltages 7 14 Pubehead 7 15 Table 7 4 Filament Control Board Test Point 7 15 Table 7 5 Generator Microprocessor Board Test Point Voltages 7 16 Table 7 6 Rotor Control Board Test Point Voltages 7 16 Table 7 7 Mai
43. IV 1 2 5 Peripheral Monitor Ports Service Manual The M IV permits the user to connect a computer via serial port to the Host Microprocessor This permits the user to monitor various subsystem serial communication transfers Use Table 3 4 Rotary Switch S4 Set tings as a guide when connecting the computer s serial port to the Host Microprocessor Note The computer used to monitor the serial communication transfers must have terminal emu lation i e VTERM ANSI VT100 etc Set the computer s serial port as follows Baud Data Bits Parity Stop Bits Flow Control SERIAL CONNECTOR XON XOFF Table 3 6 Host Peripheral Ports SWITCH SETTING N A PERIPHERAL Console X ray x ray N A Console kV mAs etc N A NOT USED N A NOT USED S6 4 ON 8 OFF CAL Data Download S6 1 OFF 2 OFF Tubehead Motors S6 1 ON 2 OFF Generator S6 Motor Controls C arm up down rotation Chapter 3 System Setup 56 1 ON 2 ON 1 OFF 2 ON Ima e Receptor AEC accessory detection 3 5 M IV 2 0 Functional Checks Mechanical These functional checks ensure that the M IV electromechanical systems are working properly Refer to Figure 3 2 C arm Controls for location of C arm and Tubehead controls 2 1 Functional Checks Compres sion System The following steps check the function of the Com pression Device dri
44. Rh 20kV 35kV Mo 28kV 39kV Hh mAs Table not selectable Density 5 to 0 to 5 Spot Large or Small Film Filter kV 1 of 3 film screen combinations calibrated Molybdenum Mo or Rhodium Rh 25kV 26kV Mo or 28kV Rh mAs not selectable Density 5 to 0 to 5 Spot Large or Small Film 1 of 3 film screen combinations calibrated Auto kV Window Filter kV 125mAs 165mAs 200mAs Auto Large 38mAs 50mAs 60mAs Auto Small not selectable Mo is the starting default 25kV 26kV mAs Table not selectable Density 5 to 0 to 5 Spot Large Film 1 of 3 film screen combinations calibrated Auto kV Window 200mAs Auto In these instances and when the system is operating with an HTC Bucky the default kV is 25 kV only Chapter 3 System Setup M IV Service Manual Table 3 11 Exposure Mode Parameter Matrix Continued TECHNIQUE Filter kV PARAMETER Molybdenum Mo or Rhodium Rh 20kV 35kV Mo 28kV 39kV Rh mAs Table 1 8mAs 125mAs 17 steps 2 150mAs 41 steps Density not selectable Spot Small Film Filter kV 1 of 3 film screen combinations calibrated Molybdenum Mo or Rhodium Rh 20kV 35kV 28kV 39kV Rh mAs Table not selectable Density 5 to 0 to 5 Spot Small Film
45. Setthe unit for a Manual mode exposure at 30 kV 50 mAs 5 Connect an oscilloscope to AOUT on the Image Receptor Microprocessor Board Connect the scope ground to TP22 AGND 6 Make an exposure and verify that the scope reading is between 9 0 VDC and 9 5 VDC If it is not the AEC Detector Gain will need to be adjusted to obtain a voltage reading as close to but not exceeding 9 5 VDC If adjustment is required proceed to the next step If no adjustment is required proceed to the next section Note Refer to Section 1 0 of this Chapter for further information on switch set tings 7 Set the Host Microprocessor for AEC Detec tor Gain Calibration S4 E S6 switch 4 ON S6 switch 8 ON Press S2 until the display reads DetGNz 22 Press 55 to change the value 8 Ifthe initial voltage reading is more than 9 5 VDC reduce the GAIN value by 1 then retake the measurement Continue the adjustment and measurement until the volt age reading falls below 9 5 VDC DO NOT reduce the GAIN value any further than the value that first achieves a voltage below 9 5 VDC 9 If the initial voltage reading is already less than 9 5 VDC first increase the GAIN value by increments of 1 until you obtain a volt age reading above 9 5 VDC then incremen tally reduce the GAIN value as stated in step 6 10 Remove IRSD from C arm and replace the cover by reversing the procedures in Chap ter 5 Section 2 5 Chapter 3 Syst
46. Switches 1 1 Remote Console Switch Settings 1 1 1 Operator Microprocessor Board DIP Switches Table 3 1 identifies the Remote Console Operator Microprocessor Board DIP switch S1 functions Table 3 1 Remote Console Operator Microprocessor Board DIP Switch S1 SWITCH ON FUNCTION OFF FUNCTION Reverse Video Normal Video LCD Display EL Display DD MM YYYY Date format MM DD YYYY Date format Not Used Test Screen ID amp Name Required For Ready No ID amp Name Required for Ready Floppy Disk Drive Installed No Floppy Disk Drive Installed Check Floppy upon Run Screen Access Skip Floppy check upon Run Screen Access Not Used Load Defaults on Power Up lt Shift gt lt Clear gt Chapter 3 System Setup 3 1 IV Service Manual 1 2 Host Microprocessor Board Switch Settings 1 2 1 Host Push buttons S1 S2 S3 S5 Use the four push buttons S1 S2 S3 S5 Items 3 through 6 Figure 3 1 below the LCD Display Item 2 Fig ure 3 1 to switch among the variables for the selected calibration to increase or decrease the displayed vari ables and to save the changed information see Table 3 2 Table 3 2 Host Push buttons SWITCH FUNCTION Save Select Decrease Increase 1 2 2 Calibration Mode DIP Switch S6 Settings Prior to calibrating any system parameter it will be necessary to first set the appropriate switches on the Cali bration Mode Dip Switch S6
47. after turning off the equipment CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components The procedures for removing and replacing the VTA Motor Driver Board in an M IV configured unit are described in Section 3 1 1 The procedures for removing and replacing the VTA Motor Driver Board in a StereoLoc 11 configured M IV unit are described in Section 3 1 2 3 1 1 M IV Configuration VTA Motor Driver Board Always remove power before performing any removal or replacement procedure 1 Remove the VTA frame as per Chapter 5 Section 2 2 Steps 1 through 7 2 Disconnect harness connectors WJ1 WJ3 WJ5 WJ6 WJZ WJ12 W 13 W 14 and WJ16 from the VTA Motor Driver Board 3 Remove 7 screws and associated hardware securing board to the VTA Remove board 5 Reverse the above procedures to install new VTA Motor Driver Board Chapter 7 Gantry Maintenance 6 Perform the following procedures before returning unit to service e Section 2 1 Functional Checks Com pression System e Section 2 2 Functional Checks C arm Movement System e Section 5 4 1 Switch Interlock Power Up Check StereoLoc 11 Configuration VTA Motor Driver Board 3 1 2 Always remove power before performing any removal or replacement procedure 1 Open the left and right front Gantry Covers as per Chapter 5 S
48. checks as necessary to calibrate the AutoFilm ID or to reset the x ray tube exposure counter 7 1 AutoFilm ID Setup This procedure checks that the AutoFilm ID is work ing properly and that the information on the film label is legible 1 Set the unit for a MANUAL mode exposure at 25 kV 20 mAs For this exposure use Film 1 and the Molybdenum Mo filter 2 Inthe ID Data Field type 1 for each char acter in the field In the Patient Name Data Field type A for each character in the field 3 Typein the Birth Date 01 01 50 then set the Sex data field to F Enter the 123 as the Tech ID Enter 12345 as the CPT Code then select L MLO as the exam view 4 n the Comments data field type the fol lowing Routine Screening 5 Place a loaded Bucky device on the IRSD Install a Compression Paddle then place 4cm of B E M on the Bucky Apply com pression until the force readout indicates 20 lbs and the thickness readout indicates 4cm 6 Rotate the C arm to 50 then move the AEC detector to position 4 7 Make the exposure remove the cassette insert the cassette into the AutoFilm ID then remove the cassette and develop the film 8 Check the contrast of the flashed label If adjustment is necessary access the Addi tional Setup screen and change the value in the Auto ID Contrast data field then repeat the test 9 Check the character definition of the flashed label If adjustment is
49. codes for floor mounting and load requirements and all OSHA requirements for safety 1 Remove the front panel from the Operator Console to access the mounting holes refer to Chapter 5 Covers Panels Fuses and Jumpers Section 2 1 for remove and replace procedures for the Operator Console Cov ers 2 Move the Operator Console near the pre installed floor anchors Note that it may d Holes require two people to move the console into 90899 position 3 Carefully position the Console over the floor Figure 2 3 Installation Operator Console anchors so that the mounting holes align over the threaded floor anchors 4 Secure the Console to the floor using the required anchor bolts and washers See Fig ure 2 3 Installation Operator Console 5 Install the console display as per Section 2 2 1 below 6 Replace the Operator Console front panel as per Chapter 5 Covers Panels Fuses and Jumpers Section 2 1 2 4 Chapter 2 System Installation IV x Service Manual 2 2 1 Installation Console Display The M IV Console Display mounts to a bracket beneath the control panel which must be removed to access the mounting hardware refer to Chapter 5 Section 2 1 for remove and replace procedures for the Operator Console Covers 1 Remove the Operator Console control panel as per Chapter 5 Section 2 1 2 Remove the hardware that fastens the con sole display mount Item 1 Figure 2 4 to the console fra
50. duplicate label on the exterior of the unit MUST BE replaced at the time of service IMPORTANT When replacing a surface i e cover panel etc that has a certified component duplicate label s a label s that represents the certified component label s MUST BE placed on the new surface at the time of service Chapter 1 General Information Figure 1 3 Label Locations Service Manual 1 10 Chapter 1 General Information IV Service Manual Chapter 2 System Installation 1 0 Unpacking The Unit This section contains procedures for unpacking setting up positioning and installing the M IV Mammogra phy System Procedures for measuring the input power receptacle voltage and for tapping the units isolation transformer are also included 1 1 Receiving Instructions The unit is shipped in three main crates which tain the following Avoid damaging the Radiation Shield by AN impact or scratching DO NOT store the e the Gantry radiation shield flat or damage may occur e Operator Console e the Radiation Shield Before opening the crates perform the following 1 2 Un crating Gantry e Inspect each crate and box for external damage e Note any observable damage on the ship ping manifest e Notify LORAD of any incident The Gantry is crated and shipped in the prone posi tion After removal from the shipping crate it will be necessary to upright the Gantry before it can be
51. e Section 4 9 Check Light Field Edge Contrast e Section 5 2 X ray Tubehead Leakage Check Perform the following Compliance Require ments before releasing the unit to the user e Affix new compliance label e Complete FDA 2579C form tube exchange Loosen Clamp NOTE Toshiba Tube mounting hardware is METRIC M6 Varian Tube mounting hardware is SAE 1 4 20 Figure 8 5 X ray Tube Removal 8 5 M IV 2 3 Tubehead Cooling Fan The tubehead cooling fan mounts to the tubehead frame on the bulkhead directly behind the x ray tube 1 Remove the tubehead top cover Locate the tubehead cooling fan on the rear of the tubehead frame Disconnect the fan power cable Remove all cable ties from the power cable then remove the hardware that secures the cooling fan mounting bracket to the tube head frame Lift the fan and bracket assem bly out of the unit If necessary remove the hardware that secures the mounting bracket to the cooling fan Reverse these steps to install the replace ment cooling fan Perform the X ray Tubehead Leakage Check before releasing the unit to the user refer to Chapter 4 Section 5 2 Figure 8 6 Tubehead Cooling Fan Removal 2 4 Filament Protection Board The Filament Protection Board mounts to the left rear side tubehead frame directly behind the x ray tube 8 6 CAUTION Be aware of the damage static electricity can inflict on electronic
52. f during the diagnostic checks the system detects a fault or error condition a message appears in the Message Area 4 After the self diagnostic checks the display screen shows the Run Mode and the start up sequence is complete Note After turning on the system a tone will sound and the Operator Console display will illumi nate These associated indicating devices indicate that system power is applied 2 12 Chapter 2 System Installation IV Service Manual Chapter 3 System Setup 1 0 Switches and Connections The Remote Console Operator Interface Microprocessor Board contains one DIP Switch S1 Refer to Chap ter 6 Operator Console Maintenance Figure 6 1 for board location within the Remote Console The Host Microprocessor Board contains a Rotary Selection switch S4 four push button switches S1 S2 S3 and 55 a Calibration Mode DIP Switch S6 a Default DIP Switch S7 and an LED display Refer to Chapter 7 Gantry Maintenance Figure 7 1 for board location within the Gantry The tables that follow detail M IV switch and jumper configurations Refer to Figure 3 1 for switch identification and location on the Host Microprocessor Board Rotary Button S4 5 Decrease Button S3 LED Display Pad 6 Increase Button S5 Save Button S1 7T Calibration Mode DIP Switch S6 Select Button S2 8 Default DIP Switch S7 LILILILI joo Figure 3 1 Host Microprocessor
53. film then measure the Optical Density Make sure that the Optical Density reading is within x0 12 OD of that at 5 cm Record the value on the Perfor mance Test Worksheet Table 3 16 Repeat the entire procedure for each kV sta tion 25 kV to 32 kV being calibrated Chapter 3 System Setup Service Manual l Table 3 16 Performance Test Worksheet Large Focal Spot Cal Check Offset Cal O D Offset These values may exceed the timing capabilities of the system due to different screen film speeds 5 2 2 Input AEC Values 20 kV 23 kV and 33 kV 39 kV Large Focus 1 Input the values for MASTER DENSITY GAIN and OFFSET used at 24 kV for each corresponding value for 20 kV 23 kV 2 Input the values for MASTER DENSITY GAIN and OFFSET used at 32 kV for each corresponding value 33 kV and above 5 2 3 AEC Calibration Large Focal Spot Rh Filter 1 Repeat Section 5 2 1 using Rhodium Rh filter at 28 kV 32 kV Record the values on the Perfor mance Test Worksheet Table 3 17 2 Useappropriate phantom material thicknesses 3 cm to 7 cm typical starting at 28 kV to make GAIN adjustments in the 20 to 35 mAs range 3 Use appropriate phantom material thicknesses to make OFFSET adjustments in the 200 mAs to 350 mAs range Table 3 17 Performance Test Worksheet Large Focal Spot Rh Gain Cal Cal Check Offset Cal O D Gain cm mAs Offset These values may need to
54. guide for troubleshooting the circuit boards in the M IV Gantry CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic discharge strap when handling static sensitive components 4 1 High Voltage Inverter Board and High Voltage Multiplier Board Table 7 1 shows the test points and their voltages or signals on the High Voltage Inverter Board Some of these test points refer to voltages or signals on the High Voltage Multiplier Board which is not accessible When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 1 High Voltage Inverter Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND _ TP 15SVREURN _ _ IP 320V RETURN 1 4 2 High Voltage Control Board Table 7 2 shows the test points and their voltages or signals on the High Voltage Control Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 2 High Voltage Control Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 1 TP2 TP3 TP4 TP5 TP6 7 TP8 TP9 N A 5V T4 j _ TO I See Table 7 3 7 14 Chapter 7 Gantry Maintenance M IV 4 3 Filament Control Board Tables 7 3 and 7 4 show the test points and their voltages or signals on the Filament Control Board
55. increase mAs or remove attenuation to decrease mAs Reload the Bucky using the same cassette and film type and repeat the exposure Verify that the mAs falls within the specified range If it does remove the cassette and develop the film Verify the absence of grid patterns in the developed film Repeat steps 1 through 7 with the C arm rotated to 90 grid travel in the direction of gravitational pull Verify the absence of grid lines on the developed film for all expo sures Repeat the entire procedure for the 24 x 30 cm Bucky Device Repeat steps 1 through 7 with the C arm rotated to 490 grid travel against the direc tion of gravitational pull Verify the absence of grid patterns on the developed film for all exposures Repeat the entire procedure for the 24 x 30 cm Bucky Device If grid patterns are present on any exposure replace with a new HTC Bucky device and repeat this procedure Chapter 4 Performance Compliance Checks and Adjustment 4 3 M IV Maximum mAs in Auto Time Mode Performance Check This check verifies that the system automatically ter minates exposures whenever the automatic expo sure control circuitry senses that optimum film density cannot be obtained within the 5 second maximum exposure time To comply the system must terminate Auto Time exposures below 5 mAs 4 4 WARNING Observe all safety precautions while mak ing an X ray exposure Place a lead blocker on the IR
56. ing an X ray exposure 1 Remove Bucky device from IRSD and the A FIELD LEFT RIGHT BORDER ADJUST compression paddle from the C arm B OVERALL FIELD SIZE INCREASE DECREASE FIELD FRONT BACK BORDER ADJUST 2 Position X ray to Light Field Template 3 405 8005 on the breast tray template will self align when positioned correctly as out lined Position intensifying screen material under template such that the entire artwork appears on the screen 3 Adjust the left and right front and rear bor ders of the light field by loosening the two screws holding the rear panel to the lamp cradle A Move the rear panel left to move the field to the right or right to move the field to the left Refer to Figure 4 8 4 Adjust the front back borders of the light field by loosening the two screws holding the lamp socket to the cradle C Move the socket up to move the field forward or down to move the field rearward To achieve front to back it may necessary to rotate lamp socket Figure 4 8 Adjustment Light Field Lamp 5 To adjust the overall field size loosen the screws holding the right panel to the lamp cradle B Move the right panel forward to increase field size or rearward to decrease field size 6 After any adjustment tighten any loose hardware then press the light field button Repeat the adjustments steps 6 7 and 8 as necessary to align the light field to the 18 x 24 cm gri
57. mounted into position 1 Cut the straps that secure the cardboard shipping carton to the shock mounted wooden pallet If shipping damage is of a concealed nature contact the carrier as soon as such damage is found and request an inspection for shipping damage Nor mally any claims for shipping damage must be com pleted within 15 days of receiving the shipment 3 Carefully remove all shipping materials i e foam padding tie downs straps shipping wrap etc that protect the Gantry during 2 Liftthe carton from the wooden pallet After the external inspection perform the following e Open all crates and boxes shipment e Check contents against packing list sales 4 Liftall accessory boxes from the pallet 5 Carefully push the entire Gantry assembly Report ALL discrepancies to LORAD forward in the direction of the base plate If it is necessary to repack any items for future instal dolly until the dolly frame clears the lation use the original packaging materials pallet approximately 1 foot See Figure 2 1 Un crating the Unit Use two people MINIMUM to lift the Gantry upright onto CAUTION the attached shipping dolly DO NOT attempt to lift or move the Gan 6 Carefully roll the Gantry to the installation try by the C arm or by either hinged door site on the left and right side of the Gantry 0 00 0 0 2L frame or damage may occur Note It is the responsibility of the dealer
58. necessary adjust the Flash Duration increase value to increase character brightness decrease value to decrease character brightness 10 Check the placement of the flashed label relative to the edge of the film If adjust ment is required access the Additional Setup screen and change the value in the Auto ID Offset data field then repeat the test Chapter 3 System Setup 11 Check that all the information on the flashed label is correct An example is shown in Figure 3 7 MCCORMICK LINDA 012 34 5678 INSTITUTION NAME 03 18 1997 12 12 1934 62 F 2 52 D No Mo 3 354 I MLO 6 123 ANYTOWN ANYSTATE U S A 28kV 226mAs PAIN LT VOQ Figure 3 7 Example AutoFilm ID Label 7 2 Exposure Counter Reset This procedure details resetting the exposure counter Perform these steps only after replacing the x ray tube 1 the Host Microprocessor board set the system to display the exposure counter S4 S6 switch 8 ON 2 Reset the exposure counter by pressing the Host switches 52 and S5 below the LED Display together 3 When complete return all switches to their normal operating positions 73 C arm Rotation Speed Check The C arm Rotation and Vertical Speed Control are both factory set at 90 of their maximum possible levels If the need arises to change them the proce dure to do so is as follows 1 Set the Host Microprocessor to the calibra tion mode S6 switch 4
59. that is concealed a surface i e cover panel etc the components duplicate label on the exterior of the unit MUST BE replaced at the time of service IMPORTANT When replacing a surface i e cover panel etc that has a certified component duplicate label s a label s that represents the certified component label s MUST BE placed on the new surface at the time of service 6 4 Compliance and Identification Label Locations The unit conforms to all applicable FDA regulations Labels addressing the certifiable components are fixed to the unit at several points Refer to Figure 1 3 Obtain each device s serial number from the main identification label and write it down on the inside cover of both the Operator s and Service manuals The Main Frame serial number is used to track units for warranty and service purposes and will be requested should it become necessary to contact LORAD regarding the device Note LORAD Bucky s 18 x 24 cm and 24 x 30 cm are certified components which are not subject to 21 CFR1020 30 d and therefore do not have to be reported on form FDA 2579 Ref BRH Doc MA3499 1 8 Chapter 1 General Information MAGNIFICATION TABLE U S and CANADA Label 1 Main Frame Gantry MADE IN USA DATE OF MANUFACTURE gt COMPLIES WITH FDA RADIATION PERFORMANCE 1 STANDARDS 21CFR SUB CHAPTER J APPLICABLE AT DATE OF MANUFACTURE MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING PA
60. the side of the C arm rotate the C arm until the pro tractor display reads 22 5 0 12 Set power to the M IV to OFF Remove CJ16 from the Motor Lamp Control Board refer to Figure 7 1 for board loca tion Adjust the rotation display potentiometer to its center position measure 2 5 kQ from the wiper to one side of the potentiometer Set backlash tension as follows e Advance backlash gear by 2 teeth Slide Angle Pot bracket to mesh the back lash and main gears insure the gears are meshed to full depth of teeth Back off less than half a tooth of the pot gear to make clearance between the gears Tighten angle pot bracket screws Reconnect CJ16 on the Motor Lamp Control Board Set power to the M IV to ON Verify Rotation Limit Switches 12 Holding the protractor against the side of the C arm rotate the C arm to 15 40 19 Note Refer to Chapter 3 Section 1 0 Switches and Connections throughout the following steps Set the Host Microprocessor Board DIP switch S4 to position 5 and S6 switch 4 to ON refer to Figure 7 1 for board location Press S2 on the Host Microprocessor Board until ang 222 is displayed on LED Dis play Pad Press S1 to zero the rotation angle display and save the C arm position to memory Rotate the C arm clockwise until the angle display reads 4 180 195 15 Chapter 7 Gantry Maintenance Service Manual 16 17 18 19 20
61. three exposure modes are always available in the Run Mode to accommo date various applications The available exposure modes for this data field are Default Setting Exposure Mode e MANUAL e AUIO TIME e AUIO KV e AUTO FILTER 3 3 6 Default Setting Magnification Mode This data field permits the user to select which one of the available exposure modes is automatically selected each time the Magnification Table is installed The choices for this data field are e MANUAL e AUIO TIME e AUTO KV 3 14 Service Manual 3 3 7 The machine may be set so that exposures are not possible unless an exam view is set in the Run Mode Typically the view reminder is turned on for clinical examinations However the user may opt to switch it off to perform verification exposures using a phantom or a service technician may turn it off while calibrating the unit Default Setting View Reminder The only options for the View Reminder are ON or OFF 3 3 8 Default Setting Timing Windows mAs Table Manual exposures require that the user set a fixed mAs for exposure timing Two mAs modes available for exact mAs step values for both modes refer to Table 3 9 are e Table 1 coarse selection e Table 2 fine selection For M IV mammography systems the selection of x ray tube kV and filter combination in Auto kV and Auto Filter modes is determined by a pre selected mAs window When the exposure mode is set to Auto
62. to return the Gantry dolly to LORAD via the supplied shipping documents Refer to LORAD Field Service Technical Bulletin No 94 0093 for policy details Chapter 2 System Installation 2 Service Manual M IV 1 3 Un crating Operator Console The Operator Console is crated and shipped upright with the console display not installed and without the radiation shield attached After removal from the shipping crate the Operator Console may be carried to its final mounting location 1 Cut the straps that secure the cardboard shipping carton to the shock mounted wooden pallet Lift the carton from the wooden pallet Carefully remove all shipping materials i e foam padding tie downs straps shipping wrap etc from the Console 4 Lift all accessory boxes from the pallet including the console display 5 Carefully lift the Operator Console off the pallet and place it gently on the floor 1 4 Unpacking Accessories The console display screen and all accessories are packed in separate boxes and containers which are stored in one of the two main shipping containers Gantry or Console The accessory containers are specially designed to minimize shipping damage and to facilitate equipment storage Note however that the radiation shield is shipped in its own box Check each item for damage 2 If it is necessary to repack any items for future installation use the original packag ing mat
63. to Figure 6 4 Remove the cables from connectors VJ1 X ray and VJ2 ON OFF Remove the hardware that mounts the board to the standoffs Gently pull the board straight off the Con trol Panel Use care not to damage the leads when removing Pull the three buttons out from the Control Panel then install the replacement buttons Carefully place the board onto the standoffs BE SURE that the button leads align with the receptacles in the sockets then press down gently to make the connection Secure the board with the mounting hard ware then replace the Control Panel Check each button function Press the ON button and verify that the system powers up Set the unit for a short exposure 25 kV 3 mAs Manual Mode Large Focal Spot press both X ray switches and verify proper operation Press the OFF button and verify that the sys tem shuts down Service Manual X RAY amp ON OFF SWITCH BOARD Figure 6 4 X ray and ON OFF Switch Board Removal Chapter 6 Operator Console Maintenance M IV 2 4 Console Display The M IV Console Display mounts to a bracket beneath the control panel which must be removed to access the mounting hardware For those units with the keyboard LED Item 11 Figure 6 1 installed in event of LED failure the Console Dis play must be replaced to correct the problem 1 Remove the Operator Console Control Panel and Front Cabinet Panel as per Chap ter 5 Section 5
64. wired Mains Impedance Maximum line impedance not to exceed 0 20 ohms for 208 220 230 240 VAC 0 16 ohms for 200 VAC IEC 601 2 7 Table 101 Maximum Power Consumption 6 5 kVA for 5 second duration Standby Current 2 0 A nominal over the entire mains voltage and frequency range Maximum Line Current 35 Amps for 5 seconds Circuit Breaker Rating 25 A time delay curve to allow for inrush currents 200 overload for 7 seconds Duty Cycle Full load 5 seconds on 30 seconds off Appendix A Specifications 1 2 Operating Environment Temperature Range 10 C to 40 C 50 F to 104 F Relative Humidity Range 30 to 75 non condensing ESD Susceptibility 3 kV for contact discharge to non grounded conductive accessible parts 8 kV air dis charge to all other accessible parts Test Method IEC 801 2 Test Levels IEC 601 1 2 EMI Susceptibility The system is immune to levels of EMI radi ation per IEC 601 1 2 EMI Generation Limits The system complies with the requirements of IEC 601 1 2 Input Line Surge fast transient burst per IEC 601 1 2 l3 Storage Environment Temperature Range 25 C to 60 13 F to 140 F Humidity Zero to 95 humidity non condensing not packaged for outdoor storage IV Service Manual 1 4 Unit Measurements Gantry with C arm Height 75 190 5 cm Crated 86 218 cm Width 25 5 64 2 cm Crated 40 102 _ cm 55 Depth 50 25 1
65. x ray field sizes all of which are available when using the large focal spot The five x ray field sizes are determined by the size of the various Compression Paddles used for large focal spot exposures i e 18 x 24 cm 24 x 30 cm The procedure that follows describes how to adjust the x ray field to the appro priate sizes for the large focal spot Refer to Table 4 4 1 Placea loaded 24 x 30 cm Bucky onto the IRSD Place a loaded 24 x 30 cm cassette on top of the Bucky Orient the cassette so that it is centered on the Bucky device then rotate it 90 degrees Slide the cassette for ward so that it overlaps the chest wall edge by approximately 3 cm see Figure 4 3 2 Install the 24 x 30 cm Compression Paddle onto the Compression Device Lower the Compression Device until the paddle just touches the surface of the cassette on the Bucky 3 Secure a marker i e coin solder etc at the front inside edge of the Compression Paddle to accurately mark the chest wall edge of the IRSD 4 Setthe Host Microprocessor for operation in the Calibration mode S6 position 4 ON Select the Collimator Position adjustment mode S4 position F 24 x 30 COMPRESSION PADDLE EDGES A B amp CHEST WALL EDGE D 6 5 mm 13mm 3mm nominal 5mm nominal Figure 4 3 X ray Field Size 24 x 30 cm 5 Set the unit for a Manual mode Large focal spot exposure at 25 kV 50 mAs Make the exposure remove both cassettes
66. x ray transmission to no more than 0 1 mR for the maximum tech nique exposure to comply with 21 CFR section 1020 31 and meets the 1 uGy per exposure as defined by IEC 601 1 3 section 292072 Compression Specifications Manual Compression Force Limited to a maximum of 67 4 Ib 300 N 0 Ib 20 Ib 0 89 from 0 to 90 C arm rotation Not less than 38 Ib 169 N for C arm angle range greater than 150 and an angle less than 150 Motorized Compression Functions in three operating modes user selectable through software e Pre Compression Force 15 7 Ib 0 5 Ib to 30 Ib 5 70 0 22 3 N to 133 5 222 3 e Full Range Compression Force 20 lb 5 to 40 Ib 5 84 9 22 3 178 22 3 e Dual Mode Compression Provides Pre Compression force upon first activation of compression switch then if switch is activated within 2 sec onds the force is increased incremen tally for each additional activation up to the user selected Full compression force Compression Controls Up Down controls on both sides of C arm and on 2 position footswitch Motorized Handwheel on both sides of Compression Device Manual Appendix A Specifications M IV Compression Release Motorized Release mode controlled by push buttons on both sides of the C arm and on the Operator Control panel User selectable automatic release mode raises Compression Device upon exposure termi nation available via Setup M
67. 28 Crated 54 137 5 cm Ng Weight 800 Ib 360 7 kg Crated 1050 Ib 473 kg includes shield assembly 5 190 5 cm Remote Console Height 35 5 90 2 cm minimum to front 42 106 7 cm maximum at rear 46 5 118 0 cm to top of display at maxi mum height Width 21 0 53 3 cm at shield including EMO switch 32 81 3 cm including radiation shield support min 36 5 92 7 cm at shield with Bar Code Reader installed Depth 1 7 43 2 cm including radiation shield Weight 214 Ib 96 3 kg Crated 260 Ib 117 kg includes accessories Radiation Shield Height 74 5 189 2 cm max height installed Width 32 81 3 cm Figure A 1 M IV System Dimensions gt Lo O No DN 53 134 7 Pb equivalent O 5 mm Pb equivalent min Appendix Specifications 2 M IV 1 5 A 3 C arm Specifications Motorized Rotation Variable speed 18 per second maximum Service selectable between 50 through 100 of full speed and displayed on the host microprocessor as 40 through 90 in increments of 5 Motor Control pro vides soft start and dynamic braking C arm Rotation 195 2 0 to 0 0 5 to 150 0 2 with electrical detents at 0 90 and 90 Rotation angle is displayed on both sides of Gantry Vertical Travel 25 to 55 63 5 cm to 140 cm from Bucky surface to floor for C arm positions at both 0 and 90
68. 3 Calibration Mode DIP Switch 56 3 2 Table 3 4 Rotary Switch 54 Settings 3 3 Table 3 5 Default DIP Switch S7 Settings 3 4 Pern nEri PONS E ern um o 3 5 Table 3 7 Setup Mode Default Worksheet 3 10 Table 3 8 Additional Setup Mode Default Worksheet 3 11 Table 3 9 Exposure Technique Default Worksheet 3 12 3 13 Table 3 11 Exposure Mode Parameter MatriXx 3 19 Table 3 11 Exposure Mode Parameter Matrix Continued 3 20 Table 3 12 X Ray Tube Date Code Month Matrix 3 21 Taole 3 13 T De Bids VONIG 3 22 Table 3 14 Typical kV range vs compressed thickness 3 25 Table 3 15 AEC Calibration Procedures 3 26 Table 3 16 Performance Test Worksheet Large Focal Spot Mo 3 29 Table 3 17 Performance Test Worksheet Large Focal Spot Rh 3 29 Table 3 18 Performance Test Worksheet Small Focal Spot Mo 3 31 Table 3 19 Performance Test Worksheet Small Focal Spot Rh 3 31 Table 4 1 Beam Quality Semi Log
69. 6 6 AutoFilm ID eee 6 6 Figure 6 7 Floppy Disk Drive Remowval eee 6 7 Figure 6 8 Operator Microprocessor Board Remosval 6 8 Figure 6 9 Low Voltage Power Supply Removal 6 9 MEGA rer dosis e N E 7 1 Figure 7 2 Gantry Mechanical 4 7 2 Figure 7 3 Removal High Voltage Generator Assembly 7 3 Figure 7 4 C arm Rotation Drive Motor and Gearbox Assembly Removal 7 10 Figure 7 5 C arm Vertical Drive Motor Removal 7 11 Figure 7 6 C arm Rotation Potentiometer Removal 7 12 Figure 8 1 Tubehead Component5s 8 1 Figure 9 2 Beam Limiting Assembly sa snrssseescessonsawesvenssavessoocsapeooeasee tasers 8 2 M cm 8 2 Figure 8 4 Beam Limiting Assembly Remosval 8 4 REMOVA 8 5 Figure 8 6 Tubehead Cooling Fan Removal a 8 6 Figure 8 7 Filament Protection Board Removal 8 6 Figure 8 8 Tubehead Switch Board Remowval esses 8 7 Figure 8 9 Tubehead Processor and Motor Control Boards Removal
70. 8 Lift the upper cover off the tubehead to access the following components e X ray Tube e Tubehead Cooling Fan e Filament Protection Board 9 Reverse procedures to replace the Tubehead Covers Chapter 5 Covers Panels Fuses and Jumpers F9 fastening hardware shown Figure 5 IV Service Manual 2 5 Image Receptor Support Device IRSD Covers 1 Remove the hardware that fastens the IRSD to the C arm frame refer to Figure 5 7 Note StereoLoc 11 models in place of the 7 will have two latches located on the rear of the C Arm sub frame 1 on each side These latches must be opened prior to removing the IRSD Z SUPPORT 2 Pull the IRSD forward to remove it from the lt LG BLOCKS C arm 3 Remove the IRSD cover to access the fol lowing components IR Microprocessor and Accessory Detect Board e AEC Detector Board e Bucky Interface Board 4 Set the IRSD down on a secure surface and Figure 5 7 IRSD and IRSD Cover Removal remove the two screws located on the sides of the IRSD which attach the cover 5 Disconnect the wiring harness from the C arm Rotation Switch and remove the two screws which attach the switch assembly to the IRSD and the IRSD cover Store the switch assembly safely 6 Grasp the IRSD firmly while pushing the cover down and forward taking care to clear the cover support brackets located in the front of the IRSD 7 Reverse procedures to replace the IRSD
71. ATI VE tide 5 7 3 3 DC lt 5 5 7 k eae sd 5 10 Chapter 6 Operator Console Maintenance 1 0 Parts Identification _ 6 1 2 0 Remove and Replace Procedures 6 2 2 1 Console Keyboard 6 2 2 2 X ray and Compression Release Switch Board Right Side 6 3 2 3 X ray and ON OFF Switch Board Left 14 6 4 2 4 Console Display titania 6 5 2 5 AutoFilm ID Assembly 6 6 2 6 Floppy DISK 6 7 2 7 Operator Interface Microprocessor 6 8 2 8 Low Voltage Power 5 6 9 240 esttrPOmis uu Ez EET ddar kerer eee eee see 6 10 3 1 Operator Interface Microprocessor 6 10 xi IV Service Manual Chapter 7 Gantry Maintenance 1 0 Parts Identification 7 1 2 0 Gantry Door Components Remove and 7 3 2 1 Generator Assembly 7 3 2 2 Generator Microprocessor Board 7 4 2 3 Filament Control 7 5 2 4 Rotor Control 7 5 2 5 Mains Power Board
72. Artwork and Signature File for 9 500 0276 MNL M4 PLATINUM SVC Artwork consists of e One hundred eighty six 186 8 V inch x 11 inch pages REV AUTHORED BY n a HOLOGIC COMPANY B MOSES DANBURY CT 06810 PROPRIETARY INFORMATION LITLE DOCUMENT NUMBER REV The content of this document is the exclusive property of Lorad and may MNL M4 PLATINUM SVC 004 not without prior written permission of Lorad be reproduced copied or used for any purpose whatsoever ARTWORK SIZE A SHEET 1 OF 1 ENG 0034 T33 Rev 001 Service Manual 9 500 0276 e _ MEO A TA i M anri M 1 x gm z V Series Hologic Company COPYRIGHT NOTICE This document is copyrighted by LORAD No part of this document may be reproduced transmitted or copied without the express written permission of LORAD A HOLOGIC COMPANY 36 Apple Ridge Road Danbury CT 06810 Phone 203 207 4500 Fax 203 207 4501 Service Support U S A 888 505 7910 Europe 32 2 711 4690 All Other 203 731 8320 2003 Hologic Inc and LORAD A Hologic Company All rights reserved Hologic LORAD LORAD A Hologic Company the LORAD logo LORAD DSM LORAD Elite Stereoloc SmartWindow StereoGuide MultiCare Dataport AutoFilm ID HTC Affinity Affinity Platinum ScoutMarc and Selenia are trademarks or registered trademarks of Hol
73. Assembly to access the x ray tube mounting hardware 2 Disconnect the high voltage cable and the filament cable from the rear of the x ray tube 3 Loosen the band clamp near the rear end of the x ray tube so that it can be slipped over the rear edge of the x ray tube 4 Remove the x ray tube mounting hardware from beneath the tubehead frame 5 Slide the x ray tube out of the tubehead frame from the front 6 Reverse this procedure to install the replacement x ray tube 7 Verify that DIP Switch S6 is set properly for the make and model x ray tube refer to Chapter 3 Section 4 2 Setting X ray Tube Type 8 Perform the following Exposure System Adjustments Calibrations and AEC Cali bration before releasing unit to the user refer to Chapter 3 e Section 4 3 Tube Bias Adjustment e Section 4 4 Tube Current mA Adjust ment e Section 4 5 Tube Voltage Potential kV Adjustment e Section 5 0 Automatic Exposure Con trol Calibration all applicable sections Chapter 8 C arm Assembly Maintenance 10 ments before releasing unit to the user refer to Chapter 4 e Section 2 1 Half Value Layer Check e Section 2 2 Reproducibility and Linear ity Manual Mode Check e Section 3 1 X ray Beam Alignment Check and Adjustment e Section 3 2 Light Field Check and Adjustment e Section 3 3 Light Field Alignment Check and Adjustment e Section 3 4 Light Field Edge Contrast Check
74. Auto Filter exposure mode is not available for magnification studies Appendix A Specifications AD Service Manual A 10 Appendix A Specifications
75. Compression Device from the left side Lift the clutch the armature and the brass spacer from the Compression Device If it is only necessary to replace the clutch skip step 5 and 6 Remove the screws that secure the clutch brake to the left side Compression Device frame Remove the clutch brake harness connector from the main harness Install the replacement clutch brake and tighten the mounting screws Connect the clutch brake harness to the main wiring har ness Slide the clutch shaft into the Compression Device from the left side the shaft end pro trudes through the opening in the clutch brake Slide the brass spacer raised edge first over the shaft and into the brake 8 10 11 12 13 Place the armature on the end of the replacement clutch machined side toward the brake Slide the clutch shaft through the clutch then out the opposite side of the Compression Device Install the previously removed knob and tighten the set screws Adjust the clutch shaft by sliding it back and forth until both knobs are equal distances from the sides of the Compression Device Place a 0 015 feeler gauge or shim stock between the armature and the clutch brake Spread the clutch mechanism so that the clutch sprocket is pressed firmly against the chain gears at right and that the armature is pressed against the feeler gauge Tighten the locking bar mounting hardware then remove the feeler gauge Check that
76. Figure 3 4 1 003 0357 Assy Operator Console Interface Microprocessor Bd Figure 6 1 1 003 0272 Assy X Ray Switch Left Figure 6 4 1 003 0278 Assy X Ray Switch Right Figure 6 3 Chapter 9 Parts List 9 1 IV Service Manual Table 9 2 C Arm Replacement Parts TABLE 9 2 C ARM REPLACEMENT PARTS FIGURE PART NUMBER DESCRIPTION NUMBER 3 530 0013 Stud Breast Tray AEC Det Position Handle Figure 8 19 4 000 0040 Assy Collimator Figure 8 2 1 080 0011 Lamp Collimator 24 V 150 W 1 080 1008 Lamp Holder Figure 8 2 1 003 0461 Assy Compression Accessory Detect PCB Figure 8 14 2 230 3006 Pulley Timing Belt Figure 8 17 4 000 0266 Assy Compression Cover Upper Figure 5 5 1 003 0465 Assy Compression AEC Position Display Right Figure 8 13 1 003 0466 Assy Compression AEC Position Display Left Figure 8 13 2 230 2006 Chain Roller 25 Figure 8 10 2 230 2001 Master Link 25 Chain Figure 8 10 4 000 0120 Assy Compression Cover Lower Figure 5 5 2 155 0006 Slip Clutch Compression Device Figure 8 15 2 320 0034 Gear Motor 24 VDC Figure 8 3 1 195 3053 Pot WW 10T 5K Ohm Figure 8 3 2 200 0016 Fan 24 VDC 5 5 CFM Collimator Assy Figure 8 2 2 200 0010 Fan 24VDC Tubehead Cooling Figure 8 1 1 003 0289 Assy Filament Protection Board Figure 8 1 4 000 0141 Image Receptor Figure 8 3 4 000 0139 AEC Assembly New Figure 8 20 1 003 0348 Assy AEC Detector Board Figure 8 20 1 003 0302 Assy Image Receptor Accessory Detect B
77. Item 7 Figure 3 1 as shown below Table 3 3 Calibration Mode DIP Switch S6 SWITCH STATUS FUNCTION see below Peripheral Monitor KJ26 Select see below Peripheral Monitor KJ26 Select ON Load TOSHIBA defaults OFF Load VARIAN defaults ON Calibration Mode Run Mode NOT USED 5 second STANDBY after x ray 30 second STANDBY after x ray Host Alarm Enabled Host Alarm Disabled Alternate S4 function 1 Alternate S4 function 2 6 1 S6 2 SWITCH SETTING PERIPHERAL Monitored at KJ26 OFF OFF Tubehead OFF ON Generator ON OFF Motor ON ON Image Receptor Normal Operating Position Refer to Table 3 4 Rotary Switch S4 Settings 3 2 Chapter 3 System Setup IV Service Manual 1 2 3 Rotary Switch S4 Settings The Rotary Selection switch 54 Item 1 Figure 3 1 is a 16 position switch numbered 0 through 9 and A through F Each switch position selects a calibration parameter see Table 3 4 The LCD display Item 2 Fig ure 3 1 will show the selected calibration parameter Table 3 4 Rotary Switch S4 Settings 4 S6 8 POSITION POSITION FUNCTION CALIBRATION Exposure Counter kV amp Mode Display Tube Type Select Varian 0 Varian 1 Toshiba mAs manual mAs Window auto modes HTC Thickness Threshold Filament Preheat Calibration Not Used Density Filter Spot Size Display HTC AKV Filament Calibration 2nd Sample Exposure Tube Grid Bias Calibration Rotation amp
78. L SETUP Time Film 1 Film 2 Film 3 Figure 3 3 The M IV Screens 3 8 Chapter 3 System Setup Service Manual icu iu B 1 w INN B B 4 ES 2 94 T I aS X 7 AN T FRAIS zm NWS Jou 8 SN WARNING This X ray unit may be dangerous to patient and operator unless safe exposure factors and operating instructions are observed For use only by qualified operators Figure 3 4 Operator Console Keyboard Figure 3 4 Legend E E A T X ray Exposure Switch 2 Compression Release Switch Power ON and OFF Switches Function Keypad Alphanumeric Keypad View Keypad Exposure Technique Keypad StereoLoc Il Option Keys not present on units without LORAD StereoLoc II option Chapter 3 System Setup S A Sas S A S gt haao E qu A BZ 2 Q to SN IE B S Za 2 N d S A T Za 2 Za S A S A S x 32 A A S dt o 3 9 Service Manual Select data fields by moving the on screen highlight bar to the data field requiring change The M IV permits several methods of selecting or highlighting the data fields Use the ARROW keys on the Function Keypad to move the highlight bar up down left or right on the screen The highlight bar also advances to the next data field by pressing the
79. Light Field Compliance 4 10 3 1 X ray Beam Alignment Check and Adjustment 4 10 3 2 Light Field Illuminance Check and Adjustment 4 16 3 3 Light Field Alignment Check and Adjustment 4 17 3 4 Light Field Edge Contrast 4 18 4 0 System Performance 4 19 4 1 M IV Bucky Device Linear Performance Check 4 19 4 2 M IV Bucky Device HTC Grid Performance Check 4 20 4 3 Maximum mAs in Auto Time Mode Performance Check 4 21 4 4 System Level Functional 4 21 4 5 Optical Density Users Preference Verification 4 21 5 0 X ray Shielding 4 22 5 1 IRSD Leakage Check tr eds 4 22 5 2 X ray Tubehead Leakage 4 23 6 0 Error Code Displays 4 24 IV Service Manual Chapter 5 Covers Panels Fuses and Jumpers 1 0 Parts Identification 5 1 2 0 Remove and Replace Covers 5 2 2 1 Operator Console Covers 5 2 T 5 3 2 3 Compression Device 5 4 2A Tab ngad buen ade dorsi oad bea se pia a 5 5 2 5 Image Receptor Support Device IRSD Covers 5 6 5 7 3 1 Fuses Operator Console 5 7 CIT
80. M IV 1 1 Warnings Cautions and Notes Definitions of Warnings Cautions and Notes used throughout this manual are as follows WARNING CAUTION data or corruption of files in software applications CAUTION ESD Cautions identify potential damage to electronic components caused by static electricity identified by this caution Service Manual Warnings point out procedures that you must follow precisely to avoid injury to yourself or others Cautions point out procedures that you must follow precisely to avoid damage to equipment loss of Always wear a grounded electrostatic discharge strap when handling static sensitive components Note Notes indicate important information that must be followed to ensure the proper operation of the system 2 0 Acronym List The following table provides a list of the common Acronyms used throughout the M IV Service Manual XX Table P 1 List of Acronyms for M IV Preface M IV Acronym O Preface Table P 1 List of Acronyms for M IV Beam Quality Half Value Layer m jme Service Manual xxi Service Manual xxii Preface IV Service Manual Chapter 1 General Information 1 0 Intended Use The M IV Mammography System is intended to produce radiographic images of the breast Its specific intended use 15 for screening and diagnostic mammography 2 0 Introduction The M IV Mammography System combines LORAD Clean Powe
81. OFF Board AutoFilm ID Assembly Operator Interface Microprocessor Low Voltage Power Supply Fuses Console Display X ray and Compression Release Board Bar Code Reader Assembly optional Floppy Disk Drive GON OQ BW N O Keyboard Illuminator Figure 6 1 Operator Console Components Chapter 6 Operator Console Maintenance 6 1 IV x Service Manual 2 0 Remove and Replace Procedures Before performing any remove and replace procedure ensure that all electrical safety precautions are met Power down the unit switch OFF the input power circuit breaker then disengage the voltage source Perform the applicable lock out or tag out procedure at the source junction box before removing any covers Refer to Section 5 for cover removal procedures 6 Apply power to the system Check the Con CAUTION trol Panel Keypads functionality Alphanu Be aware of the damage static electricity meric Mammographic View Function and can inflict on electronic components Exposure Technique Select by pressing Always wear a grounded electrostatic dis each key and verifying the key performs as charge strap when handling static sensitive described in Chapter 3 of the Operators components Manual 2 Console Keyboard KEYBOARD This procedure describes removing the keyboard CHASSIS from the Operator Console control panel 1 Remove the Operator Console Control Panel from the Console as per Chapter
82. S5 to decrease Items 5 and 6 Figure 3 1 5 Set S6 switch 4 to OFF to disable calibra tion Service Manual 3 4 Default Settings Additional Setup Mode Screen The Additional Setup Mode is a second setup screen which permits setting the interface entering system labels and changing the time and date To access the Additional Setup mode screen perform the fol lowing 1 Highlight the Setup Options data field 2 Press the Change key until Additional Setup appears in the data field Press the Enter key to switch screens Default Setting Compression Force Units Use this data field to set the method with which the system displays the compression force units of mea sure The two choices are NEWTONS or LBS Pounds 3 4 2 This data field sets the system for use with the Hospi tal or Clinic Radiographic Information System RIS The options for this data field are ATTACHED or NOT ATTACHED 3 4 3 Use this data field to type in the name of the first screen film combination to appear as a choice in the Film Type data field in the Run Mode To enter a film type follow the steps below Note that film type entry is the same for all three film type data fields 1 Highlight the Film 1 data field 2 Film fields must be backspaced to clear old screen film information Type the name of the screen film combination then press Enter 3 4 1 Default Setting RIS Setting Film 1 Note The 200 mrad windo
83. SD e IRSD Leakage Check X ray Tubehead Leakage Check Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 1 M IV 2 0 X ray System Performance The following checks verify the quality of the x ray beam the reproducibility of the x ray generation system and the consistency of the automatic exposure control system 2 1 Half Value Layer Check This compliance check verifies the quality of the x ray beam This ensures that the half value layer HVL meets the requirements set forth by the FDA 21 CFR and the recommendations by the ACR CDC This check requires the use of the following equipment 4 2 Dosimeter Type 1145 aluminum filter pack gt 99 99 pure WARNING Observe all safety precautions while mak ing an X ray exposure Mount the 18 cm x 24 cm Compression Paddle upside down onto the Compression Device Raise the Compression Device until the paddle is approximately 1 cm below the tubehead port See Figure 4 1 Place a radiation probe approximately 5 cm above the IRSD Position it so that it is cen tered laterally and 4 cm from the chest wall edge of the support device Be sure that the probe is completely within the x ray field Turn the system ON Press the LIGHT FIELD button to illuminate the x ray field Reposition the probe so that the radiation detector is centered in the beam and 4 cm from the chest wall edge Align the surface of the probe perpendicular to the beam
84. SD so that it blocks the AEC sensors within the IRSD Set the unit for an Auto Time exposure at 22 kV Large focal spot Set the Density com pensation to 5 and select the film type being used Make an exposure and verify that the post exposure mAs value is less than 5 mAs and the message Calculated Exposure Time Exceeds Maximum appears Verify that the unit displays a caution that informs the user that the calculated expo sure has exceeded the maximum Try to make another exposure before resetting the unit and verify that x ray generation is pre vented Clear the message by selecting RESET Repeat the test at 34 kV and verify that the same caution appears in the message area System Level Functional Check This check verifies system functionality 1 Chapter 4 Performance Compliance Checks and Adjustment Procedures Apply power to the system Verify the dis play works and power is applied to Gantry Check console display for error messages Set unit for a short exposure 25 kV 3 mAs Manual Mode Large Focal Spot Take exposure If no problems found with exposure return unit to service Service Manual 4 5 Optical Density Users Prefer ence Verification This procedure verifies that the system falls within the users preference for optical density 1 Install the jumper into the banana jack on the High Voltage Multiplier Remove any meter scope or probe from the machine that was us
85. Section 4 4 System Level e Chapter 4 Section 3 0 X ray and Light Functional Check Field Compliance all e Chapter 4 Section 4 0 System Perfor mance all e Chapter 4 Section 5 0 X ray Shielding Compliance all e Chapter 7 Section 5 0 Tests Adjust ments and Calibrations all e Chapter 8 Section 6 0 Tests Adjust ments and Calibrations all Chapter 7 Gantry Maintenance 7 7 M IV 2 9 Rotation Display Boards Always remove power before performing any removal or replacement procedure There are two Rotation Display Boards CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 2 9 1 Right Rotation Display Board The right rotation display board is accessed by open ing the right side Gantry door Remove and replace the board as follows 1 Disconnect the harness from the rear of the board 2 Disconnect the RJ45 jack from the rear of the board 3 Remove the mounting hardware 4 hex nuts that secure the board to the chassis then lift the Rotation Display Board out of the Gan try door 4 Reverse procedures to replace the Rotation Display Boards 5 Perform the following procedures before returning unit to service e Chapter 4 Section 4 4 System Level Functional Check 7 8 2 9 2 Service Manual Left Rotation Display Board The High Vol
86. T WALL EDGE D 13 5 nominal Figure 4 5 X ray Field Size 15 cm 10 7 5 cm Formats Chapter 4 Performance Compliance Checks and Adjustment IV Service Manual Table 4 4 X ray Field Adjustment Matrix Large Focal Spot HOST DISPLAY SELECTED FIELD SIZE FOCAL SPOT BLADE ADJUSTMENT FINAL VALUE Rear Blade x ray field Left Blade x ray field Right Blade x ray field Front Blade x ray field 1 rr Large Spot Rear Blade x ray field Large Spot Left Blade x ray field Large Spot Right Blade x ray field Large Spot Front Blade x ray field Rear Blade x ray field Left Blade x ray field Right Blade x ray field Front Blade x ray field Rear Blade x ray field Left Blade x ray field Right Blade x ray field Front Blade x ray field Rear Blade x ray field Left Blade x ray field Right Blade x ray field Front Blade x ray field Note access Host Display 6 and 7 make sure the 18 x 24 cm Bucky is installed and Small Focal Spot is selected Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 13 3 1 2 Light Field Adjustment Small Focal Spot The system requires that the light field for each colli mation size be adjusted separately for the Small focal spot before adjusting the small focus x ray fields Refer to Table 4 5 The X ray to Light Field Template 3 405 8005 is required to perform this proce
87. TENTS 5 331 567 5 280 520 5 231 564 5 216 250 OTHER US AND FOREIGN PATENTS PENDING 5 335 161 D 349 160 LORAD A HOLOGIC COMPANY DANBURY CT 06810 USA Label 4 Warning CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE RISK OF ELECTRIC SHOCK CAUTION R NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL IMPORTANT GANTRY A v Label 2 X ray Tube X RAY TUBE MANUFACTURED BY INSERT INSERT SER Manufacture date Complies with FDA Radiation Performance Standards 21 CFR Subchapter J Minimum Inherent Filtration Label5 ULCompliance MSS M 7 wW Label 9 MEDICAL EQUIPMENT KSS UL2601 1 CAN CSA C22 2NO 601 1 Gy 5D32 Label 10 Certified EN60601 1 RWTUV 601 1 IEC 601 1 x IEC 601 2 xx Service Manual CONSOLE NOTE Labels not drawn to scale for identification purposes only Label 3 Certified Component MANUFACTURED BY LORAD paneury 06810 USA MODEL SERIAL NO DATE OF MANUFACTURE COMPLIES WITH FDA RADIATION PERFORMANCE STANDARDS 21CFR SUB CHAPTER J APPLICABLE AT DATE OF MANUFACTURE Label 6 O A Label 7 Label 8 0044 3 310 0548 Label 11 LABEL 12 P N SP S516 107 REV cc NEMA TYPES 1 2 4 amp 2 5A 25 VAC 50 60 Hz LORAD DANBURY CT USA When replacing a certified component that is concealed by a surface i e cover panel etc the component s
88. Use TP7 as ground when making Filament Board measurements and TP24 when making H V Control Board measure ments Refer to Table 7 3 when test point voltages depend upon the type of tube present Table 7 3 Tubehead Variables FILAMENT FUNCTION OVER SMALL FIL OVER LARGE FIL OVER FILAMENT CTRL BD CURRENT CURRENT CURRENT Pa UST R5 R4 RO TOSHIBA 43VDC 43VDC 100VDC VARANM 83 0 60VDC 125VDC amp MARIANM HHS A 60VDC 60VDC 125VDC _ VARIANM 13 A 48VDC 48VDC 110VDC P VARIAN M 113 R O H V CTRL BD FUNCTION TEST POINT ADJUST VOLTAGE SMALOC R33 18 HAREOC TP9 9 R32 60VDC E R3 OV TP8 R20 INVERTER TP2 R3 85VDC OVER VOLTAGE TP1 R6 11 0VDC The Varian tubes are identified by their labels on the cathode end of the tube hous ing Varian types and 1 are labeled M113 Varian type 1A is labeled M113 1A Table 7 4 Filament Control Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 1 TP7 TP2 TP3 IP DGND m 5V 5 TP7 TP6 TP7 T T TP7 TP9 TP7 TP7 TP7 TP7 7 TP7 TP7 TP7 TP7 7 mo mo re TP7 E TET TP7 TP7 TP7 TP7 TP7 TP7 V REF 5 1 TP7 See Table 7 3 Chapter 7 Gantry Maintenance 7 15
89. Vertical Speed Control amp Force Load Cell Select Calibration Compression Height amp Force C arm Angle Auto Filter kV Threshold and Offset Compression Force Limits Calibration Compression Release Distance Compression Force amp Release Mode Display Not Used Small Focal Spot Collimator Calibration Software Version Display M3 Style Bucky Calibration Not Used Host Status Error Codes Image Receptor Detector Voltages I R Accessory amp Paddle Accessory Display Not Used Mirror Position Calibration Not Used Filter Position Calibration AEC Detector Gain Cal amp HTC Reduced mA Cal Factor AEC Calibration Gain Offset Mean Not Used Collimator Position Calibration aperture blade position Chapter 3 System Setup 3 3 IV Service Manual 1 2 4 Default DIP Switch S7 Settings Various states foreign communities and individual sites have instituted the 2 mGy 200 mrad maximum average glandular dose requirement The M IV meets these requirements by providing switch enabled options Prior to releasing the unit for use the 200 mrad operating requirements must be set via the Default DIP Switch 57 Item 8 Figure 3 1 as shown in Table 3 5 Note The 200 mrad window is most effective when the screen film speed is 170 or less It is gen erally not necessary to use the 200 mrad window when the screen fi
90. ade via the keyboard while the screen displays all exposure options and selec tions for the selected exposure mode Manual Auto Time Auto kV or Auto Filter Data fields on the screen list patient information name identification number gender etc exam data view CPT code and technologist identification data Status lines also inform the user as to the condition of the accessories printer AutoFilm ID compression image receptor in addition to the current date and time The display screen provides illumination for the keyboard and is manually adjustable forward and back The Operator Console houses the following compo nents Keyboard for data and technique input X ray Exposure Buttons Console Display operator interface AutoFilm ID Low Voltage Power Supply Operator Interface Microprocessor System Peripheral floppy disk drive ON and OFF Buttons Remote Compression Release Button Emergency OFF Switch Keyboard Illuminator Refer to Figure 1 1 to identify the Operator Console components Legend for Figure 1 1 Display Screen Emergency OFF Switch left side of console Data Entry Exposure Control Keyboard AutoFilm ID Cassette Storage Both Sides Radiation Shield Bar Code Reader optional Floppy Disk Drive Input Power Data Cable Connector Panel rear of console 10 Keyboard Illuminator ee Figure 1 1 M IV Operator Console Components Chapter 1 General Information Service Manua
91. al 200 mrad Screen Film Speed Requirements The 200 mrad window is most effective when the screen film speed is 170 or less It is generally not necessary to use the 200 mrad window when the screen film speed is greater than 170 Please consult your Medi cal Physicist regarding screen film combi nations and the 200 mrad window for specific recommendations default to 28 kV The exposure will be termi nated at a mAs value near one of the three mAs windows 125 mAs 165 mAs 200 mAs or the automatic 200 mrad window selectable by operator The final kV and post mAs will be displayed upon termina tion of exposure Note The sample pulse determines what kV is selected Auto Filter Exposure Mode In this mode density is selectable Auto Fil ter Exposure mode provides full automatic operation of all technique factors When this mode is selected the kV defaults to 25 kV The exposure is initiated and sampled to determine if the kV needs to be increased upward to provide an exposure within the 200 mAs or the automatic 200 mrad win dow When determined by the Auto Filter algorithm the exposure will be momen tarily interrupted and the Rhodium filter will be moved into the beam in place of the Molybdenum filter After the kV or kV filter has been selected by the algorithm the Auto Time function completes the expo sure The final kV post mAs and filter will be indicated upon termination of the expo sure 2 Note
92. al Cable with 2 x 5 header on one end Lead Shield Blocker Approximately 4 x 4 cm Feeler Gauges 0 015 and 0 020 Compression Scale Force Gauge Aluminum Aperture for Light Meter 1 mm diameter Note B E M refers to breast equivalent material such as BR 12 50 50 Breast Tissue equivalent material or Acrylic Chapter 1 General Information Service Manual M IV 4 0 Safety This portion of the manual details electrical mechanical and radiation safety as well as precautions concern Service Manual ing static electricity and magnetic media storage The equipment complies with IEC 601 General Collateral and applicable Particular Standards UL 2601 and CSA 22 2601 41 Electrical Safety The system is classified as CLASS I TYPE B perma nently connected equipment as per IEC 601 1 and Class Il Medical Devices per 21 CFR 892 1710 There are no special provisions to protect the system from flammable anesthetics or ingress of liquids Three Emergency OFF EMO switches are provided Two switches are located on the Gantry one on each side and the third switch is located on the operator console Each of these switches disables power to the entire system WARNING Only qualified electronic technicians who are certified and experienced in the main tenance and repair of high voltage x ray equipment should attempt to service this equipment WARNING LETHAL voltages are present within the interi
93. al density requirement can be met it attempts to maximize contrast by terminating the exposure as near the set timing window as possible less than or equal to should not exceed This however must be achieved while still maintaining the optical den sity requirements Priority 23 The third priority of the system is to reduce patient dose This is done by maintaining the starting kV level or by incrementing the kV to a level less than the maximum Reduction of patient dose however must not compromise the optical density and or the contrast requirements 3 3 8 2 Auto Timing Window The auto timing window based on breast thickness should be selected by those users who are required to meet the 2 mGy 200 mrad maximum average glandular dose requirement The auto timing window is calculated by the M IV during the exposure When the Auto timing window is selected the final kV or kV filter combination is determined as follows If breast thickness T is 4 5 cm mAs window 60 maximum kV 28 Else if T 4 5 mAs window 165 minimum kV 28 maximum kV 30 for Auto kV maximum kV 32 for Auto Filter Chapter 3 System Setup Service Manual In practice the kV selected for exposing the stan dard breast phantom will be between 27 and 28 kV depending on the desired film density The corre sponding average glandular dose will be less than 2 mGy 200 mrad 3 3 9 To print hard copy labels of pa
94. all the replace ment Low Voltage Power Supply BE SURE to fasten the earth ground wire with one of the mounting screws during installation Connect a DMM to the Operator Interface Board at TP21 GND and TP4 Adjust V1 on the Low Voltage Power Supply located in the upper left corner of the power supply for 5 15 VDC Perform the System Level Functional Check as per Chapter 4 Section 4 5 3 Chapter 6 Operator Console Maintenance Service Manual LOW VOLTAGE POWER SUPPLY Figure 6 9 Low Voltage Power Supply Removal 6 9 M IV 3 0 Test Points Use the following test point table as a guide for troubleshooting the circuit board in the M IV Operator Con sole 3 1 Operator Interface Microprocessor Table 6 1 shows the test points and their voltages signals on the Operator Interface Microprocessor When taking measurements connect the voltmeter ground appropriately according to the table below Table 6 1 Test Point Voltage Matrix TEST POINT VOLTAGE SIGNAL GROUND BACKLIGHT CASSETTE EL DRIVE LCD VEE 6 10 Chapter 6 Operator Console Maintenance IV x Service Manual Chapter 7 Gantry Maintenance 1 0 Parts Identification Figures 7 1 and 7 2 show the locations of the serviceable Gantry components Figure 7 1 shows the locations of the gantry circuit boards Figure 7 2 shows the locations of the gantry mechanical assemblies Legend for Figure 7 1 1 Rotation Display Board 2 2
95. andoffs 1 Disconnect the harness connectors from 4 Reverse procedures to replace the C arm REID and ABJ6 at the top of the board Microprocessor Board 2 Disconnect the harness connectors from 5 Chapter 8 Section 6 5 Setting Force Load ABJ2 ABJ5 and ABJ7 at the left side Cell of the board 3 Disconnect the harness connectors from ABJ3 ABJ4 and ABJ10 at the right side of the board 4 Liftthe Mains Power Board off of the mount ing standoffs 5 Reverse procedures to replace the Mains Power Board 6 Perform the following procedures before returning unit to service e Turn power ON Check for abnormal odors or any other indication of an electrical malfunction e Chapter 3 Section 2 0 Functional Checks Mechanical e Chapter 4 Section 4 4 System Level Functional Check 7 6 Chapter 7 Gantry Maintenance M IV 2 Host Microprocessor Board 2 8 Motor Lamp Control Board Always remove power before performing any Always remove power before performing any removal or replacement procedure Access the Host removal or replacement procedure Access the Microprocessor Board by opening the right side Motor Lamp Control Board by opening the right Gantry door side Gantry door CAUTION CAUTION Be aware of the damage static electricity Be aware of the damage static electricity can inflict on electronic components can inflict on electronic components Always wear a grounded electrostatic dis Always
96. ard connec tors Note each cable location for replace ment Remove the hardware that secures the Switch Board mounting bracket to the tube head frame Lift the Switch Board and mounting bracket off the tubehead frame as an assembly Reverse these steps to install the replace ment Switch Board Verify all switch functions before releasing the unit to the user refer to Chapter 3 Sec tion 2 2 Functional Checks C arm Move ment System Steps 3 and 4 Section 2 3 Functional Checks Collimator Lamp But ton and Section 2 4 Functional Checks Collimator Override Switch Chapter 8 C arm Assembly Maintenance Service Manual Figure 8 8 Tubehead Switch Board Removal 8 7 IV x Service Manual 2 6 Tubehead Microprocessor and 6 Reverse these steps to install the replace Tubehead Motor Driver Board ment Tubehead Microprocessor and the Tubehead Motor Driver Board The Tubehead Motor Driver Board mounts to the 7 Perform the following Checks and Adjust bottom of the tubehead frame directly behind the ments before releasing the unit to the user beam limiting assembly The Tubehead Micropro refer to Chapter 4 cessor mounts to standoffs on the Tubehead Motor Diver board e Section 3 2 Light Field Check and Adjustment e Section 3 3 Light Field Alignment CAUTION Check and Adjustment Be aware of the damage static electricity e Section 3 4 Light Field Edge Contrast can
97. at monitor operation before during and after an x ray exposure If these diagnostic routines detect a malfunction further operation is prevented until the detected fault is cleared All fault messages are displayed on the Operator Console Flat Panel Display Chapter 1 General Information 1 1 M IV 3 1 Required Tools and Equipment The following is a list of the tools and equipment necessary to perform the maintenance procedures detailed in this manual Standard Hand Tools Oscilloscope Digital Multimeter DMM Hex Allen Wrench Set standard Light Detector Model 268P or equivalent Light Meter UDT Instruments Model 351 or equivalent Radiation Meter with probe calibrated in the Mammographic ranges Aluminum Filter Pack Ultra high purity type 1145 99 99 pure 3 8 Drive Socket Set P M M A Acrylic Attenuators or B E M 1 cm thick min of 10 x 12 5 cm P M M A Acrylic Attenuators or B E M 2 cm thick min of 10 x 12 5 cm P M M A Acrylic Attenuators or B E M 4 cm thick min of 10 x 12 5 cm High Voltage Divider with a ratio of 10 000 1 or 100 000 1 High Voltage Adapter Cable LORAD P N 2 425 3015 mAs Meter Light Field Alignment Bars 9 060 0173 Light X ray Field Template 9 060 0140 Field Service Belt Adjustment Tool 9 061 0107 Loctite 242 Blue 2 580 0542 Masking Tape Laptop Computer P C with serial port Mammography Phantom ACR MAP PLCC EPROM Remover Seri
98. axis Adjust the collimator to the smallest field size that can fit the radiation probe Select Manual mode and the Large focal spot Set the unit for an exposure at 30 kV 100 mAs molybdenum Mo filter Make an exposure without an aluminum sheet in the x ray field and record the milliroentgen reading on the semi log Table 4 1 Service Manual Aluminum Filter 99 pure Compression Tray Up Side Down Figure 4 1 Half Value Layer Setup Add 0 2 mm of aluminum between the x ray tube and the radiation probe by placing the aluminum sheet in the Compression Paddle Use the light field lamp to verify that the aluminum sheet completely blocks the x ray beam path to the radiation probe Make another exposure and record the mil liroentgen reading on the semilog Repeat step 5 with additional 0 1 mm sheets of aluminum between the x ray tube port and the radiation probe Record the milliroentgen reading on the semi log after each exposure until the reading is less than one half the original step 4 exposure read ing without aluminum Draw a line on the semilog through the plotted mR readings It may be necessary in cases where the plotted readings are not linear to draw the line to achieve a best fit path Chapter 4 Performance Compliance Checks and Adjustment M IV 8 Determine the exact half value of the step 4 mR reading and record this on the semi log Draw a horizontal line starting from
99. be increased to meet the timing capabilities of the system Chapter 3 System Setup 3 29 M IV Small Focal Spot Mean Optical Density and Thickness Tracking Note Use the same cassette for all cali bration steps Set the unit for an exposure Auto Time exposure at 25 kV Small focal spot Mo fil ter Remove the Bucky device and install the Magnification Table Place 2 cm of BR 12 50 50 B E M or P M M A acrylic on the Magnification Table centered laterally and extending over the chest wall edge approxi mately 1 cm using the 10 cm or 15 cm mag paddle Note Phantom material thickness requirements may vary depending on kV station being calibrated Place the AEC detector in the position clos est to the chest wall Take an exposure develop the film then measure the optical density OD Note Always measure the Optical Den sity with the lower edge of the film flush with the front edge of the Densit ometer and centered side to side approximately 5 0 cm into film plane Service Manual 10 Using initial shot as starting point adjust the Optical Density to the value requested by the customer Press 52 until the GAIN value appears on the display Decrease 53 the value if the density is too light or increase S5 the value if the density is too dark then press S1 to save the new value Make another exposure develop the film then measure the Optical Density Repeat the GAIN ad
100. bel 1 L1 Film Label 2 L1 Film Label LARGE 1200 mAs Auto Chapter 3 System Setup M IV 3 3 Setting Defaulis Setup Mode Screen Use the following as a guide when setting system defaults to the user preferences previously recorded in Tables 3 7 3 8 and 3 9 3 3 1 Default Setting Pre Compression Force This data field permits selection of the motorized pre compression force to the values in the chart below The force setting selected here will also be the pre compression force setting for the Dual Compression Force mode The approximate Pre Compression Forces available are listed below 3 3 2 Default Setting Full Compression Force This data field permits selection of the motorized full range compression force to the values in the chart below The force setting selected here will also be the full range compression force setting for the Dual Com pression Force mode The approximate Full Compression Forces available are listed in Table 3 10 Table 3 10 Compression Force PRE COMPRESSION FULL COMPRESSION OF FORCE FORCE FORCE FORCE FORCE RANGE LBS N LBS N 3 3 3 Default Settings Compression Release Mode The compression release function operates in one of two user selectable modes The setting made here dictates which release mode the unit will be in when system power is first applied The compression release modes are MANUAL and AUTOMATIC The Compre
101. c dis charge strap when handling static sensitive components Turn power OFF then remove the bottom IRSD cover Locate the switch board near the center of the frame as viewed from the rear then disconnect the wiring harness from AAJ2 Loosen the two screws that secure the switch board bracket to the IRSD frame then pull the entire assembly out of the unit Remove the screws that fasten the switch board to the bracket Reverse these steps to install the replace ment C arm Rotation Switch Board Perform the following procedures before returning unit to service e Chapter 3 Steps 3 and 4 of Section 2 2 Functional Checks C arm Movement System Chapter 8 C arm Assembly Maintenance M IV 4 3 Bucky Driver Board The Bucky Driver Board is mounted to the rear frame of the IRSD Figure 8 18 Access this board by removing the IRSD bottom cover CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 1 Turn power OFF then remove the bottom IRSD cover 2 Locate the driver board near the left side of the frame as viewed from the rear then disconnect the wiring harnesses from ARJ1 ARJ2 and ARJ3 3 Remove the hardware that secures the Bucky Driver Board to the IRSD frame then lift the board out of the unit 4 Reverse this procedure to install the replacement Bucky Driv
102. ce Appendix A Specifications M IV Radiation Output 1 10 1 11 Equal to or greater than 800 mR second 7 16 Gy sec for at least 3 seconds output measured through the Compression Paddle 4 5 cm above the breast support 4 0 cm from the chest wall edge using exposure techniques of Mo Mo target filter large focal spot 28 kV MQSA X ray Collimation System detects the attached image receptor and automatically adjusts the field size to limit the beam as required by 21 CFR With no accessory installed the beam is limited to the size of the image receptor support device 18 x 24 cm Light Field Specifications Collimator Lamp Illuminates for 30 seconds 5 seconds upon pressing a Light Field button on either side of the x ray tubehead and from the operators console key F6 or by pressing a compression Down Function Extinguishes automatically upon exposure initiation Service Manual Light Field Illuminance 160 lux minimum meets 21 CFR 1020 31 requirements Lamp is adjustable to provide alignment of the light field to the x ray field Light Field to X ray Field Congruency 1 12 X ray field to light field misalignment for both length and width is 296 of the SID 1 30 cm Comply with IEC 601 1 3 and 21 CFR High Voltage Generator Specifi cations Output Rating 3 2 kilowatt maximum isowatt 100 mA at 32 kV Ripple 2 or less typical maximum 4 Topology Pulse widt
103. ce Manual M IV 7 Disconnect PJ1 Unscrew the EMO switch assembly and move wires out of the way 2 2 Generator Microprocessor Board Always remove power before performing any removal or replacement procedure Access the Gen erator Microprocessor Board by opening the left side Gantry door 9 Remove the middle and bottom screws holding the assembly to the gantry 10 Disconnect the connectors NJ1 NJ4 and NJ5 the HV control board 11 With one hand on the multiplier board and one hand under the HV control board frame lift up the assembly taking care to clear the bottom studs removing the assem bly from the gantry CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 12 Once it is clear slide it down to clear the upper studs removing the entire assembly 13 Reverse procedures to replace the H V Generator Assembly 1 Disconnect the harness connectors from AGJ2 AGJ7 and AGJ8 on the board 2 Disconnect the 40 pin ribbon cable from AGJ3 on the board Disconnect the 20 pin ribbon cable from AGJ1 on the board 14 Perform the following procedures before returning unit to service e Chapter 3 Section 4 1 Line Regulation Check e Chapter 3 Section 4 4 Tube Current 3 mA Adjustment e Chapter 3 Section 4 5 Tube Voltage Potential kV Adjust
104. cm to the readout logic module of a radiation rate meter Set the meter s operat ing mode to read in mR hr Place the read out logic module so that it can be viewed from behind the radiation shield 2 Mount an 18 x 24 cm Bucky to the IRSD Place a 1 16 inch thick 1 6 mm sheet of lead with a 5 inch 12 7 cm diameter hole a in it on the IRSD Slide this lead sheet to Figure 4 10 Check IRSD Shielding position the hole at the position marked Figure 4 10 Collimate the x ray field to the 18 x 24 cm field size 3 Position the probe beneath the IRSD relative to the center of the hole in the lead sheet Raise or lower the support stand until the probe is exactly 5 centimeters below the bottom of the tray structure Face the probe s detector surface toward the x ray source 4 Apply power to the unit Set the system for a Manual mode exposure at 39 kV 220 mAs using the Large focal spot 5 Make an exposure and record the mR read ing If the reading exceeds 0 05 mR correc tive action is indicated 6 Repeat steps 2 through 5 for positions B and in Figure 4 10 7 Mount a 24 x 30 cm Bucky on the IRSD Repeat steps 2 through 6 for positions E F G and H in Figure 4 10 Replace any image receptor holder if there are any readings above 0 05 mR Ensure x ray field size is 24 x 30 cm 42200 Chapter 4 Performance Complionce Checks and Adjustment M IV 5 2 X ray Tube
105. components Always wear a grounded electrostatic dis charge strap when handling static sensitive CONNECTOR components Remove the tubehead top cover Locate the Filament Protection Board near the left rear side of the tubehead frame Remove all cables from their board connec tors Use Table 8 2 to determine jumper locations during reinstallation Table 8 2 Filament Protection Board Cables CABLE DESCRIPTION from Filament Board to X ray Tube from C arm Interlock Interface board to Tube Temp to Lamp Lamp Fan Remove the mounting hardware that secures the Filament Protection Board to the tubehead frame Lift the board off of the standoffs Reverse these steps to install the replace ment Filament Protection Board Perform the X ray Tubehead Leakage Check refer to Chapter 4 Section 5 2 Perform the Tube Current mA Adjustment before releasing the unit to the user refer to Chapter 3 Section 4 4 Figure 8 7 Filament Protection Board Removal Chapter 8 C arm Assembly Maintenance Service Manual M IV 2 5 Tubehead Switch Boards There are two Tubehead Switch Boards one on either side of the tubehead The Switch Boards mount onto brackets which are then mounted on the side of the tubehead frame 1 Remove the top and bottom tubehead cov ers Locate the Switch Board one on each side of the tubehead frame that requires replacement Remove all cables from their bo
106. console frame standoffs Lift the board out of the console Refer to Figure 6 8 Figure 6 8 Operator Microprocessor Board Removal 4 Install the replacement Operator Interface Microprocessor by reversing this procedure 5 Apply power to the system Verify that the floppy disk drive indicator lamp illuminates for approximately three seconds during the boot up process indicating drive recogni tion Check the Control Panel Keypads func tionality Alphanumeric Mammographic View Function and Exposure Technique Select by pressing each key and verifying the key performs as described in the Opera tors Manual 6 8 Chapter 6 Operator Console Maintenance M IV 2 8 Low Voltage Power Supply The Low Voltage Power Supply mounts to the Con sole chassis in the front component compartment Refer to Figure 6 9 Access the power supply by removing the front cabinet panel 1 Remove the Front Cabinet Panel from the Console as per Chapter 5 Section 5 2 1 Steps 1 through 5 Remove the input power wires from the ter minal block TB1 The terminal block TB1 configuration is as follows Pin 1 Ground Pin 2 Neutral Pin 3 Line Remove the large connector and the 5 volt input wires from the terminal block TB2 Remove the hardware that secures the Low Voltage Power Supply to the Console frame Note that one of the mounting screws secures an earth ground wire Reverse these steps to inst
107. conversion table on the meter or in the meter manual Subtract the background lux value from the light field lux value and record the difference 4 Repeatthis illuminance test for the remain ing positions C and D in Figure 4 6 Service Manual If necessary loosen the two screws that secure the lamp socket to the lamp cradle Figure 4 7 Increase the light field illumi nance by adjusting the lamp position within the cradle Rotate the lamp and socket together clockwise or counterclockwise so that the lamp filament is parallel with the plane of the mirror Tighten the screws replace the tubehead cover then repeat the test Verify that the length to width ratio of the light field is not altered Note The lamp socket mounting screws are metric If the check still fails replace the lamp and repeat the entire check When complete perform the light field alignment Figure 4 6 Probe Locations Light Field nance 5 The difference between the background reading and the illuminated reading in any quadrant must be 160 lux or greater Figure 4 7 Adjustment Light Field Chapter 4 Performance Compliance Checks and Adjustment M IV 3 3 Light Field Alignment Check and Adjustment The X ray to Light Field Template 3 405 8005 and intensifying screen material are required to perform this procedure WARNING Observe all safety precautions while mak
108. cross the filaments System Error 43 Measure mAs error Error indicates problem with mAs High Voltage Control Bucky Error 50 Fault detected from the Bucky non HTC grid Image Receptor Control Bucky Error 51 Bucky Fault HTC Bucky not communicating with IR Bucky IR Control microprocessor serial interface Rotation Switch Error 60 CCW rotation switch closed Check tubehead switches CCW Rotation Rotation Switch Error 61 CW rotation switch closed Check tubehead switches Lamp Switch Error 62 Lamp switch closed Check tubehead switches Collimator Lamp Compression Up switch closed Check C Arm and foot switches Compression Down switch closed Check C Arm and foot switches switches C Arm Vertical Switch Error 66 C Arm Vertical Up switch closed Check C Arm and foot C Arm Up switches C Arm Vertical Switch Error 67 C Arm Vertical Down switch closed Check C Arm and C Arm Down foot switches SL IIl Motion Error 68 StereoLoc Il out of alignment StereoLoc II Stage Motion Error 69 C Arm drive motor communication fault Vertical rotation C Arm Drive Motors and compression drive motors ubehead Error 70 Motorized collimator error Check collimator blade drives Tubehead Microprocessor Tubehead Error 71 Motorized mirror error Check mirror drive Tubehead Microprocessor Tubehead Error 72 Motorized filter error Check filter drive ubehead Microprocessor Chapter 4 Pertormance Compliance Checks and Adjustment Procedures
109. d Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 17 M IV 3 4 Light Field Edge Contrast Check This check ensures the contrast of the lighted x ray field complies to the performance standard set forth by FDA 21 CFR Subchapter J Always perform this test with the ambient light reduced darken the room The following equipment is required for this test Light Detector Model 268P Light meter UDT Instruments Model 351 Aluminum Aperture 1 mm diameter or equivalent Place the probe of a light detector on the IRSD and center it Place the aluminum aperture directly on the probe Position it so that the aperture is centered on the probe s sensor Turn the room lights OFF and record the ambient light reading as IA Place the light detector in area A on the IRSD see Figure 4 9 Orient the center of the probe 3 mm from the edge of the defined light field toward the center of the field 11 Collimate the light probe so that only a 1 square centimeter area near the center is visible Press the light field button and record the inside lux value 11 Move the probe 3 mm from the edge of the defined light field away from the center of the field Reposition the aluminum filter press the light field switch then record the outside lux reading 12 Subtract both edge readings from the ambi ent reading and record each of the differ ences IA D1 and IA 12 02 Divide the insid
110. d momentarily to prevent over or undershoot during the second sample This procedure adjusts the filament off time to provide a stable second sample 5 6 1 Adjustment Off Time 100 mA 1 Install the HTC Bucky Device on the IRSD then raise the Compression Device com pletely 2 Set the unit for an Auto kV exposure with a 25 kV start Completely block the AEC detector with lead 3 Connect a storage oscilloscope to TP4 mA sense on the High Voltage Control Board then connect the probe ground to TP24 AGND 4 Make an exposure and check the second sample waveform for under or overshoot If adjustment is required set the Host Micro processor for the 100 mA off time adjust ment S4 at position 4 S6 switch 8 ON Press S2 until the display reads HfilHi 5 Decrease the value if the waveform indi cates undershoot increase the value if the waveform indicates overshoot 6 Continue making adjustments and expo sures until the second sample waveform is stable Chapter 3 System Setup 5 6 2 1 Service Manual Adjustment Off Time reduced mA With the HTC Bucky Device on the IRSD lower the compression device completely Set the unit for an Auto kV exposure with a 25 kV start Completely block the AEC detector with lead Connect a storage oscilloscope to TP4 mA Sense on the High Voltage Control Board then connect the probe ground to TP24 AGND Make an exposure and check the s
111. dure 1 Press the Light Field button and observe illu minated area on the X ray to Light Field Template 9 060 0140 2 If any adjustments are necessary press S2 lt Select gt on the Host Microprocessor Board until the desired collimator blade value displays i e 7 rr 18 x 24 cm light field small focus rear blade See Table 4 5 for all collimator blade settings 3 Press 55 lt increase gt or 53 lt decrease gt on the Host to change the value for the dis played collimator blade under adjustment Note that 10 increments on the display equals approximately 1 mm movement at the film plane for the adjusted blade Service Manual 3 1 3 X ray Field Adjustment Small Focal Spot Perform these steps only after adjusting the collima tor blades for the small focal spot light field formats Refer to Table 4 5 The X ray to Light Field Template 3 405 8005 and intensifying screen material are required to perform this procedure 1 Install the X ray to Light Field Alignment Template 9 060 0140 Insure correct align ment on the C arm assembly before pro ceeding 2 Collimator blade positions for the small X ray field are 11 12 13 14 and 15 on the Host Display Referencing the Intensifying Screen Template Fixture adjust collimator sizes for the small focal spot as listed below and labeled small on your template Ap Code FS SIZE Code FS SIZE 15 Small 6x7 5 0 Large 24 x 30 XL_
112. e switch board to the standoffs Gently pull the switch board straight off the control panel Use care not to damage the switch leads when removing Pull the two switches out from the Control Panel then install the replacement switches Carefully place the switch board onto the standoffs Be sure that the switch leads align with the receptacles in the switch sockets then press down gently to make the connection Secure the board with the mounting hard ware then replace the control panel Apply power and check each switch func tion Set the unit for a short exposure 25 kV 3 mAs Manual Mode Large Focal Spot press both X ray switches and verify proper switch operation Press the Compression Release Switch and verify the Compression Clutch Brake disen gages and the Compression Device moves up Chapter 6 Operator Console Maintenance X RAY amp COMPRESSION RELEASE SWITCH BOARD Service Manual Figure 6 3 X ray and Compression Release Switch Board Removal 6 3 M IV 2 3 X ray and ON OFF Switch Board Left Side The system incorporates two x ray switch boards one on the left side of the control panel and one on the right side The x ray switch board on the left side also contains the power ON and OFF buttons 1 6 4 Remove the Operator Console Control Panel from the Console as per Chapter 5 Section 5 2 1 Steps 6 through 10 Turn the Control Panel over to access the board Refer
113. e a single sweep as follows Trigger Channel 1 Vertical DC Volts 0 2 division small focus DC Volts 0 5 division large focus Horizontal 20 milliseconds Single Sweep Set the unit for Manual mode exposure at 20 kV 3 mAs Press x ray switches and examine the acquired waveform Examine the waveform 10 ms 0 01 sec from the leading edge of the waveform for under or over shoot A reference waveform is shown Figure 3 5 If undershoot or overshoot exists set the Host Microproces sor for Filament Calibration S4 to position 2 S6 switch 8 OFF Press 55 to increase for undershoot or press S3 to decrease for overshoot the displayed value Objective is to ensure the waveform is flat from 10 ms and greater Chapter 3 System Setup Service Manual 3 A M IV 10 Make another exposure and check the waveform again for under or overshoot Repeat the adjustments and exposures until the waveform is stable 11 Advance to the next kV station 21 then repeat the exposures and adjustments as per Step 9 Continue advancing through the kV stations for the large focal spot until all kV stations have been adjusted 12 Repeat Steps 9 through 11 for small focal spot Reference Waveform Patterns ADJUSTMENT CORRECT VALUE TOO LOW UNDERSHOOT GOOD Service Manual 13 For units that do not have an HTC Bucky go to Step 14 For units equipped with HTC Bucky install HTC Bucky and repeat Step
114. e difference by the outside difference and record the ratio D1 D2 R Repeat the procedure for the remaining light field edges Place the light meter probe at positions B C and D for these checks A contrast ratio less than 4 at any edge is cause for rejection Service Manual 1mm dia DETECTOR Figure 4 9 Check Light Field Edge Contrast Chapter 4 Performance Compliance Checks and Adjustment M IV 4 0 System Performance Service Manual The following checks verify performance of the Bucky device motor drive circuitry and the automatic expo sure termination circuitry 4 1 M IV Bucky Device Linear Per formance Check Perform this performance check after servicing the M IV style Linear Bucky device or before utilization of a new Linear Bucky device This procedure requires the user to make exposures to check for grid lines on the developed film Grid lines are typically visible under the following conditions 1 Long exposures grid moving too fast or 2 Short expo sures grid moving too slow Mount the 18 x 24 cm Bucky device on the IRSD sure the Bucky s electrical connection is made This procedure requires exposing and developing films It will be necessary to place attenuation between the tubehead and the Bucky for these tests WARNING Observe all safety precautions while mak ing X ray exposure Note Use the same Bucky device cas sette and film type for all expos
115. e front edge of the Densit ometer and centered side to side approximately 5 0 cm into film plane Using initial exposure as starting point adjust the Optical Density to the value requested by the customer Press 52 until the GAIN value appears on the display Decrease 53 the value if the density is too light or increase S5 the value if the density is too dark then press S1 to save the new value Make another exposure develop the film then measure the Optical Density Repeat the GAIN adjustments and exposures as necessary to obtain the 0 12 OD from the mean OD requirement Always save the val ues after making a change Record the value on the Performance Test Worksheet Table 3 16 Replace the 2 cm phantom material with the 5 cm phantom material Using the same techniques make an exposure develop the film then measure the Optical Density Press S2 until the OFFSET value appears on the display Modify the value to increase or decrease the Optical Density S3 and 55 Increasing the OFFSET decreases the Opti cal Density decreasing the OFFSET increases the Optical Density Make an exposure develop the film then measure the Optical Density Repeat the OFFSET adjustments and exposures as nec essary to obtain the 0 12 OD from the mean OD requirement Record the value on the Performance Test Worksheet Table 3 16 Replace the 5 cm phantom material with the 4 cm phantom material make an expo sure develop the
116. eam Limiting Assembly Chassis DM EUR LX Fan Assembly FILTER MIRROR ASSEMBLY upper tier COLLIMATOR ASSEMBLY lower tier Figure 8 2 Beam Limiting Assembly Service Manual Legend for Figure 8 3 1 W E id ul Compression AEC Position Display Boards 2 Compression Accessory Detect Board Compression Clutch and Clutch Brake Assembly Manual Compression Handwheels Compression Thickness Potentiometer Compression Drive Brake Compression Drive Motor Compression Drive Chain IRSD Figure 8 3 C arm Components Chapter 8 C arm Assembly Maintenance Service Manual 2 0 Remove and Replace Tubehead Components Before performing any remove and replace procedure ensure that all electrical safety precautions are met Power down the unit set the circuit breaker to OFF then disengage the voltage source Perform the applicable lock out or tag out procedure at the source junction box before removing any covers CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic discharge strap when handling static sensitive components 2 1 The Beam Limiting Assembly mounts below the x ray tube inside the tubehead enclosure The Beam Limiting Assembly is a 2 tier mechanism an upper tier containing the dual filter changer and the mirror lamp assembly and a lower tier containing the 4 blade au
117. econd sample waveform for under or overshoot If adjustment is required set the Host Micro processor for the reduced mA off time adjustment S4 at position 4 S6 switch 8 ON Press S2 until the display reads Decrease the value if the waveform indi cates undershoot increase the value if the waveform indicates overshoot Continue making exposures and adjust ments until the second sample waveform is stable 5 7 M IV Reduced mA Optical Density Offset Calibration This procedure is only necessary if you have HTC grid Buckys Install the HTC Bucky device on the M IV image receptor support Place a loaded cassette into the Bucky device Service Manual Place the same cassette in the HTC Bucky with 3 cm of B E M and lower the compres sion device on to the phantom paddle must be below the threshold Release an expo sure and develop the film The Reduced mA exposure must be within 0 12 OD of the 100 mA exposure If it is not set the Host Microprocessor for HTC REDUCED mA CAL 54 at position E 56 switch 8 ON Press 52 until the Host dis play reads HaecF 2 Settheunitfor an Auto Time exposure at 25 kV Place 3 cm of B E M on the Bucky and If the OD is too light increase 53 the center it over the exposure detectors Raise value then repeat the exposure and optical the compression device above the compres density measurement sion height threshold setting I
118. ection 2 2 Steps 2 through 4 2 Disconnect harness connectors WJ1 WJ3 WJ5 WJ6 WJZ WJ12 WJ13 WJ14 and WJ16 from the VTA Motor Driver Board 3 Locate 3 locking standoffs at top of board release standoff locks and remove top of board from standoffs 4 Lift board slightly up and away from VTA and remove board through right side of Gantry frame 5 Reverse the above procedures to install new VTA Motor Driver Board 6 Perform the following procedures before returning unit to service e Section 2 1 Functional Checks Com pression System e Section 2 2 Functional Checks C arm Movement System e Section 5 4 1 Switch Interlock Power Up Check 7 9 10 C arm Rotation Drive Motor Gearbox Assembly Remove the upper rear Gantry panel as per Chapter 5 Section 2 2 Steps 8 and 9 Position C arm so the C arm Rotation Drive Motor and Gearbox Assembly Item 1 Fig ure 7 2 is accessible through the Gantry upper rear access hole Turn power OFF From rear of unit disconnect the motor power cable from the wiring harness Cut all cable ties securing the harness to the motor and gearbox assembly On the drive coupling Item 1 Figure 7 4 loosen the upper coupling screw Item 2 Figure 7 4 Remove the four bolts Item 3 Figure 7 4 that mount the motor and gearbox assembly to the VTA Lift assembly shaft Item 4 Figure 7 4 out of drive coupling and remove motor and gear assembly through Ga
119. ed in any procedures prior to beginning this verification Install the HTC Bucky device with a loaded cassette on the IRSD For units that do not have the HTC Bucky device option install the linear Bucky device Place the ACR Phantom on the IRSD cen tered laterally and positioned 1 cm back from the chest wall edge Move the AEC Detectors so that they are directly under the ACR Phantom Set the unit for an exposure using the default exposure mode Make an exposure Remove the cassette and develop the film Check the film s optical density and verify that it is at the mean optical density as required by the site If the optical density of the film is not within the limits stated in step 7 perform the AEC Calibration procedures as per Chapter 3 Section 5 0 4 2 M IV Service Manual po 5 0 X ray Shielding Compliance Lead shielding in the x ray tube housing and in the lower tubehead enclosure minimizes leakage radiation The IRSD and the space behind the AEC sensor also incorporate lead shielding The following procedures check the shielding performance of the IRSD and the tubehead 5 1 IRSD Leakage Check This check is performed at the factory and is not required at installation However it will be neces sary to perform this check after repairing or replac ing the IRSD WARNING Observe all safety precautions while mak ing an X ray exposure 1 Connect a radiation scatter probe 100 square
120. edge Use motor ized compression to lower the compression paddle onto the phantom material Insert a loaded cassette into the Bucky then make a 25 kV Auto Time exposure Record the mAs value as point A on the semi log worksheet Chapter 4 Table 4 1 Beam Quality Semi Log Half value Layer Release compression and place 5 cm of phantom material on the Bucky Reapply compression then make a second expo sure Record this mAs value as point B on the semi log worksheet Draw a line between points A and B on the semi log Follow the left side of the graph and locate the 80 mAs point Draw a straight line and intercept the line between the 2 points Draw a vertical line from that point to the bottom of the graph and note the compres sion thickness value indicated This is the compression thickness threshold value Turn S4 to position 2 on the Host board Place 58 to ON Using S3 decrease or 55 increase change the displayed value to the value calculated on the graph Chapter 3 System Setup M IV 5 6 HIC Filament Off Time Auto kV Calibration The Auto kV Mode makes either one or two sample exposures depending on if the kV changes or remains the same The system enters a standby con dition filament at load no x rays after the first sam ple which permits the HTC grid to return to the home position During the standby condition the filament must turn off load remove
121. eet For each pair of successive tests 20 mAs and 60 mAs then 60 mAs and 100 mAs and so on calculate the sum of each Step 10 result and record on the Linearity Work sheet Divide each Step 11 difference value by each Step 12 sum value If the result for any pair exceeds 0 10 the test is considered failed Repeat steps 8 through 13 using the Small focal spot If the unit fails any part of the above test first recheck all calculations then repeat the tests Reproducibility Auto Time Mode Check The following test verifies that the Automatic Expo sure Control system is reproducible in the Auto Time exposure mode Failure to meet this performance test indicates the need to check the calibration of the Automatic Exposure Control System WARNING Observe all safety precautions while mak ing an X ray exposure Mount a cassette holder with an empty cas sette onto the IRSD Place a 4 cm acrylic phantom on the cassette Position a radia tion probe 10 square cm on top of the phantom Align the probe position with the AEC sensor at front center on the IRSD Use the light field and collimate the x ray field to the approximate size of the probe Set the unit for an exposure with the follow ing factors 25 kV Large focal spot Molyb denum filter Select Auto Time exposure mode then make 10 exposures Record mil liroentgen reading for each exposure Calculate the average milliroentgen reading Sub
122. efer to x ray tube s documen tation On the Host press Select S2 until the installed x ray tube type appears Varian 0 Varian 1 or Toshiba The Varian tubes are identified by their labels on the cathode end of the tube housing 3 Select Varian 0 for Varian M113 and M1 13R x ray tubes refer to tube serial num ber and Table 3 12 if necessary Select Varian 1 for M113 1 and M113 1A Varian x ray tubes Note The last two digits of the tube serial number is the date code The alpha digit indicates the month see Table 3 11 the numeric digit indicate the year i e R7 May 1997 Chapter 3 System Setup Table 3 12 X Ray Tube Date Code Month Matrix CODE MONTH CODE MONTH CODE MONTH N JANUARY R MAY V SEPTEMBER FEBRUARY 5 JUNE W OCTOBER P MARCH T JULY X NOVEMBER Q APRIL U AUGUST Y DECEMBER 4 Press S1 to save the selection the saved selection is displayed in capital letters Set the Host for normal operation S6 switch 4 OFF 4 3 Tube Bias Adjustment This procedure sets the Tube Bias to the manufac turer s specification The tube bias is set at the fac tory or at the site after replacing the x ray tube BE SURE to select the proper x ray tube as determined by the previous procedure BEFORE making the Tube Bias Adjustment 1 Set the Host Microprocessor for the calibra tion mode S6 switch 4 ON 2 Ensure the proper tube is selected S4 to posi
123. eft side Gantry door 1 Disconnect the harness connectors from MJ1 MJ2 and MJ3 on the board Disconnect the 20 pin ribbon cable from MJ4 on the board Lift the Rotor Control Board off of the mounting standoffs Reverse procedures to replace the Rotor Control Board Perform the following procedures before returning unit to service e Chapter 4 Section 4 4 System Level Functional Check Disconnect E1 and E2 quick disconnects 7 5 M IV 2 5 Mains Power Board 2 6 Microprocessor Board Always remove power before performing any Always remove power before performing any removal or replacement procedure removal or replacement procedure Access the C arm Microprocessor Board by opening the right side Gantry door WARNING Circuit breaker must be OFF before pro ceeding CAUTION Be aware of the damage static electricity can inflict on electronic components CAUTION Always wear a grounded electrostatic dis charge strap when handling static sensitive Be aware of the damage static electricity components can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive 1 Disconnect the harness connectors from components AEJ3 and 4 on the board 2 Disconnect the RJ45 jack from AEJ5 on the board Access the Mains Power Board by opening the left side Gantry door Lift the C arm Microprocessor Board off of the mounting st
124. ehead and the Bucky for these tests WARNING Observe all safety precautions while mak ing X ray exposure Note Use the same Bucky device cas sette and film type for all exposures 1 With the C arm at 0 set the unit for an Auto Time 25 kV exposure Large spot Normal density Select the Film Type being used 2 Placea loaded cassette in the Bucky device then place 2 cm of B E M or M M A acrylic on the Bucky Device Hold the attenuation in place with the compression device 3 Verify a low mAs reading is obtained nomi nally between 12 and 20 mAs dependent on film speed If the mAs reading is above or below the specified range add attenua tion to increase mAs or remove attenuation to decrease mAs 4 20 Service Manual um 10 Reload the Bucky using the same cassette and film type and repeat the exposure Verify that the mAs falls within the specified range If it does remove the cassette and develop the film Verify the absence of grid patterns in the developed film Place 5 cm of B E M acrylic on the Bucky and hold it in place with the paddle Reload the same cassette with the same film type then load it into the same Bucky Make an exposure using the technique fac tors from step 1 Verify a high mAs read ing is obtained nominally between 250 and 350 mAs dependent on film speed If the mAs reading is above or below the specified range add attenuation to
125. el off the console This 11 provides access to the following compo nents e Keyboard e Switch Boards e ID e Floppy Disk Drive Reverse procedures to replace the Operator Control Panel and the Front Cabinet Panel Chapter 5 Covers Panels Fuses and Jumpers M IV Gantry Covers WARNING Always remove power before performing any removal or replacement procedure Access to the serviceable components and assem blies of the Gantry are through these covers e Left and Right Side Doors hinged Items 1 and 2 Figure 5 1 e Left and Right Front Covers Items 3 and 4 Figure 5 1 e VIA Frame Item 5 Figure 5 1 e Upper Rear Panel Item 6 Figure 5 1 e Lower Rear Panel Item 7 Figure 5 1 Refer to Figure 5 4 throughout the following Left and Right Side Gantry Doors hinged To open Left or Right Gantry doors access the top restraining hardware and release locking mechanism Left and Right Front Covers Remove the hardware that fastens the Left Front Gantry cover to the VTA vertical travel assembly frame FRONT and SIDE GANTRY COVERS Service Manual 3 Pull the cover off the locating pins then lift it off the frame 4 Repeat Steps 2 and 3 for the Right Front Gantry Cover VTA Frame 5 Attop of M IV Unit locate two bolts secur ing top of the VTA frame to Gantry Remove bolts spacers and washers 6 Locate two bolts securing bottom of the VTA frame to the Gantry base R
126. em Setup Service Manual 5 2 5 2 1 AEC Calibration Initial Calibration Mean Optical Density and Thickness Tracking For systems with Linear Grids only perform this pro cedure as written For systems with the HTC Grid only Section 5 3 Preparation for Compression Thickness Threshold Adjustment and Section 5 4 Reduced Large Spot mA Calibration must be per formed prior to AEC calibration For systems incor porating both Linear and HTC Grid perform this procedure using the Linear Bucky Note To ensure proper AEC tracking exposures used to adjust the OFFSET must be taken between 200 mAs and 350 mAs Exposures used to adjust the GAIN must be taken between 20 mAs and 35 mAs By remaining within the specific mAs range settings given for both GAIN and OFFSET adjustments made to one will minimally affect the other Note Always take sample exposures then adjust the amount of attenuation to achieve the proper mAs before making GAIN or OFFSET adjustments Note All kV stations used clinically must be calibrated as per this procedure Note To accurately perform AEC Calibra tion you will need an 18 x 24 cm cas sette and a 24 x 30 cm cassette that are matched for OD within 0 05 OD 1 Open the right side Gantry door to access the Host Microprocessor Set the Host Microprocessor to the Calibration Mode S6 switch 4 ON then set the system for AEC Calibration S4 to position E S6 switch 8 OFF 2 In
127. emove and Replace IRSD Components 8 14 4 1 Image Receptor Accessory Detect Board 9 14 4 2 C arm Rotation Switch 8 14 4 3 Bucky Driver Board 8 15 4 4 Image Receptor 8 15 4 5 AEC Detect 8 16 m 8 17 5 1 Filament Protection Board 8 17 5 2 Tubehead Microprocessor 8 17 5 3 Tubehead Motor Driver Board 8 18 5 4 Compression AEC Position Display 8 18 5 5 Image Receptor 8 19 5 6 Bucky Interface 8 19 6 0 Tests Adjustments and Calibrations 8 20 6 1 Compression Force 8 20 6 2 Compression Thickness Potentiometer Calibration 8 20 6 3 Compression Chain Tension Adjustment 8 21 6 4 Compression Thickness Potentiometer Mechanical Adjustment 8 22 6 5 Setting Force Load Cell 8 22 6 6 Compression Accessory Detect Board Verification 8 23 6 7 Image Receptor Detect Board Verification 8 23 Chapter 9 Parts List 1 0 Introduction 9 1 1 1 The Replacement Parts 11515 9 1 xiii M IV
128. emove and replace procedure ensure that all electrical safety precautions are met Power down the unit switch OFF the input power circuit breaker then disengage the voltage source Perform the applicable lock out tag out procedure at the source junction box before removing any covers 4 1 Image Receptor Accessory Detect Board The Image Receptor Accessory Detect Board is mounted to the rear frame IRSD Figure 8 18 Access this board by removing the IRSD bottom cover CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 1 Turn power OFF then remove the bottom IRSD cover 2 Locate the detect board on the right side of the frame as viewed from the rear then disconnect the wiring harness from AFJ1 3 Remove the four mounting screws then lift the board out of the IRSD 4 Reverse this procedure to install the replacement Image Receptor Detect Board 5 Perform the following procedures before returning unit to service e Chapter 8 Section 6 7 Image Receptor Detect Board Verification 9 14 4 2 C arm Rotation Switch Board A C arm Rotation Switch Board is mounted to the rear frame of the IRSD Access this board by remov ing the IRSD bottom cover CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostati
129. emove bolts and washers 7 Pull VTA frame forward on pivot tube to enable access to VTA components It may be necessary to rotate VTA frame to a hori zontal position in order to facilitate access Upper Rear Access Panel 8 9 Remove the mounting hardware that fastens the Upper Rear access panel to the Gantry cover Lift the upper rear access panel off the unit Lower Rear Access Panel 10 Remove the mounting hardware that fastens 11 the Lower Rear access panel to the Gantry cover Lift the lower rear access panel off the unit REAR GANTRY COVERS Figure 5 4 Gantry Covers Removal Chapter 5 Covers Panels Fuses and Jumpers 5 3 M IV 2 3 Compression Device Covers Access to the serviceable components and assem blies of the C arm are through these covers A 5 4 Upper Compression Device Cover Lower Compression Device Cover CAUTION Note The top and bottom Compression Device covers are fastened to the compres sion bellows Use care not to damage the bellows when removing these covers Remove the mounting hardware that fastens the Compression Device covers top and bottom to the Compression Device See Figure 5 5 Carefully lift the covers off the compression Device to access the following components e Compression Clutch e Compression Clutch brake e Compression Drive e Compression Brake e Compression Paddle Detection Board Disconnect the wiring between the c
130. emove the top and bottom Compression Device covers as per Chapter 5 Section 2 3 Compression Device Covers Use care not to damage the Compression Device bellows Remove the harness connector from ADJ1 on the board Remove the hardware that secures the Com pression Accessory Detect Board to the Compression Device frame Reverse these steps to install the replace ment detect board Perform the Compression Accessory Detect Board Verification Section 6 6 before releasing the unit to the user Figure 8 14 Compression Accessory Detect Board Removal 8 11 Chapter 8 C arm Assembly Maintenance M IV 3 5 Service Manual Compression Clutch and Clutch Brake Assembly The Compression Device houses a clutch and clutch brake assembly for patient safety during compression Figure 8 15 The clutch brake prevents Compression Device backlash after motorized compression the clutch stops manual compression before the maximum compression force is exceeded 8 12 Clutch Brake Armature Figure 8 15 Compression Clutch and Clutch Brake Removal Turn power OFF then remove the top and bottom Compression Device covers Use care not to damage the Compression Device bellows Loosen the set screws that secure the right side compression knob to the clutch shaft Slide the knob off the shaft Loosen the screws that secure the locking bar to the clutch shaft Slide the clutch shaft out of the
131. er Board Verify operation of the Bucky Device 5 Perform the following procedures before returning unit to service e Chapter 4 Section 5 1 IRSD Leakage Check Bucky Driver Board Figure 8 18 IRSD Components rear frame Removal Chapter 8 C arm Assembly Maintenance Service Manual 4 4 Image Receptor Microprocessor The Image Receptor Microprocessor is mounted beneath the breast tray on the IRSD Figure 8 19 Access this board by removing the IRSD bottom cover CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive componen s 1 Turn power OFF then remove the bottom IRSD cover 2 Locate the microprocessor board beneath the breast tray as viewed from below then disconnect the wiring harnesses from FJ1 FJ2 FJ3 FJA FJ7 FJ8 and FJ11 3 Remove the ribbon cable from AEC Detec tor Assembly from FJ5 on the Microproces sor 4 Remove the mounting hardware that secures the microprocessor to the standoffs on the bottom of the breast tray then remove the board from the unit 5 Reverse these steps to install the replace ment Image Receptor Microprocessor Board 6 Perform the following procedures before returning unit to service e Chapter 4 Section 5 1 IRSD Leakage Check Figure 8 19 IRSD Components breast tray Removal 8 15 IV Ser
132. er until the machine lock is broken and the coupler and drive pulley can be removed from the assembly shaft Item 3 Figure 7 5 Figure 7 5 C arm Vertical Drive Motor Removal 8 Remove coupler drive pulley and key Item 4 Figure 7 5 take care not to drop key Note pulley position and key way orienta tion As pulley is removed belt may fall to bottom of unit around lead screw 6 Figure 7 2 Set coupler drive pulley and key aside 9 From rear of unit remove the four bolts Item 5 Figure 7 5 that mount the motor and gearbox assembly to the Vertical Travel Assembly VTA 10 Reverse this procedure to reinstall the C arm Rotation Drive Motor and Gearbox Assembly Ensure the following e Belt is positioned around the C arm drive pulley and the lead screw nut pul ley prior to tightening the 2 C arm drive pulley hex head bolts e Pulley is positioned and key way is aligned with drive shaft as noted in Step 7 above e Key is installed Chapter 7 Gantry Maintenance 7 1 M IV 3 4 7 12 C arm Rotation Potentiometer Access the C arm Rotation Potentiometer by removing the upper rear Gantry cover as per Chapter 5 Section 2 2 Steps 5 and 6 Raise C arm so the C arm Rotation Potenti ometer Item 2 Figure 7 6 is positioned as shown in Upper Rear Access Hole Item 1 Figure 7 6 at the rear of the unit Remove cable ties securing wires to mount ing bracket Note position of wires on p
133. erials 3 Open the radiation shield container and carefully remove the glass shield 4 Check the shield for nicks cuts scratches or Figure 2 1 Un crating the Unit other damage 5 Place all accessories in a storage area or compartment near the installation site Note The storage area should provide conve nient access to each accessory but should not interfere with C arm or patient move ment 2 2 Chapter 2 System Installation IV Service Manual 2 0 Unit Installation Note that the installation site exam room must be properly prepared by qualified personnel prior to installing the unit Verify that the following are complete prior to transporting the unit to the installation site e Floor modifications anchor bolts for Gantry and Console e Pre installed Wire runs and Conduits e Voltage source facilitating a hard wire configuration Position the Gantry and the Operator Console in the appropriate room Pay particular attention to the follow ing e Clearances for C arm rotation and rear Gantry access e Positioning of Console and radiation shield relative to x ray source e Space for patient movement Avoid obstructions in the room that may hinder access to the Operator Console or the patient Provide conve nient storage for patient records film cassette holders and other accessories 2 1 Installation Gantry 5 Secure the Gantry to the floor using the rec ommended anchor bolts and washe
134. erify the following e C arm moves upward e C arm stops automatically upon reach ing travel limit 2 Press and hold a C arm DOWN button Item 6 Figure 3 2 and verify the following C arm move downward e Carm stops automatically upon reach ing travel limit Note Repeat steps 1 and 2 using the attached Footswitches 3 Press and hold counterclockwise C arm ROTATION button Item 3 Figure 3 2 and verify the following e rotates counterclockwise as viewed from the front e Rotation speed gradually increases e stops automatically upon reach Ing 150 4 Press and hold a clockwise C arm ROTA TION button Item 2 Figure 3 2 and verify the following e C arm rotates clockwise as viewed from the front e Rotation speed gradually increases C arm slows then pauses momentarily at 0 before continuing e stops automatically upon reach Ing 195 Chapter 3 System Setup IV Service Manual 2 3 Functional Checks Collimator 2 4 Functional Checks Collimator Lamp Button Override Switch The following check verifies proper function of the The following check verifies proper function of the Collimator Lamp the Collimator Lamp buttons and Collimator override button Item 1 Figure 3 2 the Collimator Lamp logic circuitry Press the Collimator Lamp button 1 Press a Collimator Lamp button Item 4 2 Press the COLLIMATOR OVERRIDE button Figure 3 2 and
135. es are marked with loca tion of the AEC sensor positions The pad dles are composed of polycarbonate The sensor position marking is not detectable on film when imaged with 1 cm of acrylic attenuator at 20 kV to an optical density of 1 2 OD Paddle attenuation is less than 15 reduction of mrad mAs at 25 kV The pad dles provide a parallel plane to the image receptor under 25 Ib of compression force The paddles are adjustable to provide the focal spot compression device and image receptor alignment requirement The following paddles are available e 24 30 cm Compression paddle e 18x24 cm Compression paddle e 24x 30cm F A S T paddle 18x24 cm FA S T paddle e 15 cm Contact paddle e 10 cm Spot Contact paddle e 15 cm Magnification paddle e 10 cm Spot Magnification paddle e 15 cm Perforated Local paddle 10 cm Perforated Local paddle e 15 cm Rectangular Open paddle e 10 cm Rectangular Local paddle e Frameless Spot paddle e 15 cm Ultrasound paddle e Small Breast paddle e 7 5 Spot Mag paddle e 7 5 cm Spot paddle A 4 M IV X ray Tube Specifications Focal Spot NEMA IEC Large Focal Spot 0 3 mm Small Focal Spot 0 1 mm Tube Voltage 20 kV to 39 kV maximum Tube Current maximum Large Focal Spot 100 mA minimum between 25 and 32 kV Small Focal Spot 30 mA minimum between 25 and 32 kV Anode Rotation 180 Hz 9600 RPM minimum Anode Angle Bi angular Large focal spot at 16 Small
136. et Panel Item 2 Figure 5 3 Remove the Front Cabinet Panel 1 Remove the decorative hole covers from the bottom corners of the front panel to access the mounting hardware Item 3 Figure 5 3 Use care not to damage the covers during removal 2 Disengage the one quarter turn fasteners that secure the front panel to the console frame 3 Pull the bottom of the panel away from the frame so that the top edge clears the locat Ing pins 4 Remove ground lead attached to panel CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components 5 Liftthe front panel off the Console frame to access the following components e Operator Microprocessor Board e Low Voltage Power Supply e Operator Console Fuses e Floppy Disk Drive Remove the Operator Control Panel 6 Remove the two screws Item 4 Figure 5 3 that fasten the Control Panel to the Console frame 5 2 ie Lift the Control Panel far enough to gain access to the console cables Disconnect connector JP1 from the Control Panel Disconnect the Sub Panel Cable Harness Assembly connector located behind and below the LCD Display Item 5 Figure 5 3 2 2 lt 26 752 In Do 2 a 29524 Ss a gt lt a A a a wa Figure 5 3 Operator Console Covers Removal 10 Lift the Control Pan
137. f the OD is too dark decrease S5 the 3 Make an exposure remove the cassette value then repeat the exposure and optical then develop the film Measure the optical density of the film and record density measurement Continue this process until the reduced mA OD measurement matches the 100 mA OD measurement within 0 12 OD 6 0 Download Calibration Values The following method permits the user to download the calibration data to text file or a floppy disk via Win dows M terminal mode which can then be saved to a computer 1 Use a serial cable to link the laptop computer to the Host Microprocessor Board KJ15 Enter Win dows M terminal mode on the computer Insert a floppy diskette into the computer s floppy disk drive 2 On the Host Microprocessor set the system for the calibration mode S6 switch 4 ON Set the sys tem for calibration range 2 S6 switch 8 2 OFF Select position O on the Host Rotary Switch S4 3 On the Host Microprocessor press S1 seven times once for each page of the calibration printout When the transfer is complete select Stop from the menu The file printout will contain the calibration values for Filament Preheat Angle Compression Force and Compression Height Magnification Compression Height Mirror Filter and Aperture Blade Positions Film 1 2 and 3 AEC Values Mo and Rh 3 34 Chapter 3 System Setup 7 0 Final Set Up Checks Service Manual Perform these
138. g from the aver age Square each difference Add the squares and divide their sum by 9 Take the square root of the result 4 Divide the number obtained in Step 3 by the average milliroentgen reading The quo tient called the coefficient of variation must be less than 0 05 Note To calculate the coefficient of vari ation use the Reproducibility Work sheet Table 4 2 which sequences the steps to calculate the quotient Table 4 2 also provides a formula to calculate the quotient using a statistical calcula tor Note that the kV and mAs values are not set for this check Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 9 M IV Service Manual 3 0 X ray and Light Field Compliance The following checks and adjustments are used to ensure that the alignment of the x ray field and light field are within the specifications set forth by the FDA 21 CFR and the recommendations by the ACR CDC 3 1 X ray Beam Alignment Check and Adjustment The following paragraphs describe how to adjust the collimator blades to the appropriate field sizes for both the large and small focal spots Two reference tables are provided for these adjustments Table 4 4 for large focal spot adjustments and Table 4 5 for small focal spot adjustments WARNING Observe all safety precautions while mak ing an X ray exposure 3 1 1 X ray Field Adjustment Large Focal Spot The automatic beam limiting device provides five
139. h modulated High Frequency active servo controlled Duty Cycle 5 seconds on 30 seconds off Table A 1 kV mA Range Appendix Specifications A M IV mAs Range The M IV employs an integrating mAs timer for use as manual timing and as the backup timer An additional hardware safety timer is employed Manual mAs Range TABLE 1 default 3 mAs through 500 mAs 23 steps 3 4 5 6 4 8 10 12 5 16 20 25 32 40 50 64 80 100 125 160 200 250 320 400 and 500 TABLE 2 user selected 3 mAs through 500 mAs 59 steps 3 4 5 6 7 8 9 10 12 14 16 18 20 22 24 26 28 30 32 5 35 37 5 40 42 5 45 47 5 50 55 60 65 70 75 80 85 90 95 100 110 120 130 140 150 160 170 180 190 200 220 240 260 280 300 325 350 375 400 425 450 475 500 Mag Manual mAs Range TABLE 1 3 mAs through 125 mAs 17 steps 3 4 5 6 4 8 10 12 5 16 20 25 32 40 50 64 80 100 and 125 TABLE 2 3 mAs through 150 mAs 41 steps 3 4 5 6 7 8 9 10 12 14 16 18 20 22 24 26 28 30 32 5 35 37 5 40 42 5 45 47 5 50 55 60 65 70 75 80 85 90 95 100 110 120 130 140 and 150 Appendix Specifications Service Manual 1 13 Accuracy Reproducibility and Linearity Specifications Reproducibility 0 05 coefficient of variation for 10 consecu tive exposures 21 Linearity 0 10 for adjacent mAs selections per the fol lowing
140. he Display works Check that the Display presentation is crisp and bright and that the text and graphics are clear legible and not blurred Replace all covers and panels before releas ing the unit to the user CONSOLE DISPLAY DISPLAY MOUNT Figure 6 5 Console Display Removal 6 5 M IV 2 5 AutoFilm ID Assembly The AutoFilm ID assembly Item 2 Figure 6 6 mounts to the base of the Operator Console top shelf The mounting hardware is accessed by remov ing the Control Panel 1 1 Remove the Operator Console Control Panel and Front Cabinet Panel as per Chap ter 5 Section 5 2 1 Remove the Console Display as per Section 6 2 4 Remove the hardware Item 1 Figure 6 6 that secures the AutoFilm ID Cassette Guide Assembly Item 8 Figure 6 6 to the Console top shelf Remove the hardware Item 3 Figure 6 6 that mounts the plastic bezel Item 4 Figure 6 6 to the AutoFilm ID Base assembly Item 9 Figure 6 6 At this time the two insu lated grounding straps Item 7 Figure 6 6 between the Cassette Guide Assembly and the Base Assembly will be removed Remove the plastic bezel from the front slot Item 5 Figure 6 6 in the Console It may be necessary to work the bezel back and forth while pulling the bezel from the Con sole Disconnect the AutoFilm ID cables from the connectors on the Operator Microprocessor TJ8 TJ10 Lift the entire AutoFilm ID assembly from the Console Reverse thi
141. he connection of the protective earth ter minal ts critical to the safety of the opera tor and the patient ALWAYS ensure that this connection Is made prior to replacing the rear panel Under no circumstances should this equipment be operated with the protective earth connector not in place 3 310 0638 Figure 2 10 Connecting to Source 4 0 System Power Up For normal operation always perform the following checks prior to applying power to the M IV e Check that the primary source power circuit breaker is ON e Check that the M IV circuit breaker on the back of the Gantry is ON e Verify that ALL Emergency OFF Switches two on the Gantry one on the Console are in the RESET position When complete follow the start up sequence below to power up the system 1 On the Operator Console press the ON button to apply power 2 The system performs a series of checks of the internal subsystems During this time the remote micro processors activate and report to the Host microprocessor During boot up the current software versions will be displayed on the bottom of the screen will stay on screen for approximately 10 seconds To freeze view press shift view at same time repeat to un freeze view Failure of a subsystem to report causes an error condition To hold the start up sequence so that the error mes sage remains on the screen press the SHIFT and VIEW keys To resume press the SHIFT and VIEW keys again 3
142. he exposure will exceed the Backup time exposure will be limited within one of the following lim Its 1 50 milliseconds 2 5 mAs 3 with an entrance exposure to the ACR Accreditation Phantom of less than 50 mR Indication is made to the operator A man ual reset is required to continue Auto kV Exposure Mode In this mode filter and density are select able Linear Bucky Operation When Auto kV and the Molybdenum filter are selected the kV will default to 25 kV The starting kV may be incremented to 26 kV by the operator If the Rhodium filter is selected the kV will default to 28 kV Upon exposure initiation the AEC signal is sam pled and the kV may be incremented upward to a maximum of 30 kV if the Molybdenum filter is selected or 32 kV if the Rhodium filter is selected The exposure will be terminated at a mAs value near one of the three mAs windows 125 mAs 165 mAs 200 mAs or the automatic 200 mrad window selectable by operator The final kV and post mAs will be displayed upon termination of exposure Appendix A Specifications M IV HTC Bucky Operation When Auto kV and the Molybdenum filter are selected the kV will default to a value determined by the Compression Height Threshold setting The kV will default to 24 kV for a compression height value less than the threshold or to 25 kV for compression height values above the threshold When the Rhodium filter is selected the kV will Service Manu
143. head Leakage Check This check is performed at the factory and is not required at installation However it will be neces sary to perform this check after repair or replace ment of the tubehead housing or the lower tubehead cover WARNING Observe all safety precautions while mak ing an X ray exposure My Mh 1 Block the tubehead window with approxi mately 4 x 4 cm lead shield blocker 2 Connect a radiation scatter probe 100 square cm to the readout logic module of a Figure 4 11 Check Tubehead Shielding radiation rate meter Set the meter s operat ing mode to read in milliroentgens per hour mR Hour Place the readout logic module so that it can be viewed from behind the radiation shield 3 Use fixtures to hold the probe in position with relation to the tubehead as shown in Figure 4 11 Position the probe at location A Make sure the distance between the probe and the focal spot source is exactly 1 meter 39 3 8 inches 4 Apply power to the unit Set the system for a Manual mode exposure at 39 kV 220 mAs using the Large focal spot Make an expo sure and record the mR reading 5 Make exposures using the same technique factors for positions B through H Fig ure 4 11 Record each mR reading For position H rotate the C arm to position the probe directly behind the tubehead Be sure the distance between the probe and the focal spot re
144. i Ag peidoo eq Aew 1 510 x s JO 4 J x lt 9 D ejnui40 y NOILVIHVA JO 14319144309 94 eje noje NOILVIA3G QHVQNVIS 9ului1919 dW 80 0 NVHL SS31 38 LSNW NOILVIYVA dO 09191544900 NVAI JO 1U9I21jJ909 y NOILVIHVA 1 SIY JO ooejd ui 401e n9 e9 21 11 e esn o L 19191343909 9 9915 6 3 15 3 9915 9 4315 LOOd AYVNOS JAVL Chapter 4 Performance Compliance Checks and Adjustment 1009 OS D ACIAIC 4 SAN IVA AYVNOS id 4915 qav Reproducibility Worksheet 3SVddAV AHL 4915 HOV3 LOVELENs l9valgsfs o IL JL j 1L j j jO j L esses 94109 94109 94109 94109 94109 94109 94109 94109 4109 94109 ONILLAS Table 4 2 SONIQV3H V 431 JO JOVH3AV AAG NASC NAGZ NAGZ NASZ NAGE ANODINHOSAL 59 50 01 1 59 1591 1 1531 ALIMNEIONGOddsAd 318V 1 4 6 Sen eA 1591 jueuunoop eui peid
145. ield Small Spot Rear Blade x ray field L T3 t 15 15 4 SmallSpot Left Blade x ray field 13 15x15cm Field Small Spot Right Blade x ray field 13 15x15cm Field SmallSpot Front Blade x ray field pa Small Spot Rear Blade x ray field 6xl0cm Field SmallSpot Left Blade x ray field SmallSpot Right Blade x ray field C Small Spot Front Blade x ray field L i5mi f 6x75cm Field SmallSpot Rear Blade x ray field T5lt 6x75cm Field SmallSpot Left Blade x ray field 1588 6x75cm Field SmallSpot Right Blade x ray field 15 6x7 5cm Fild SmallSpot Front Blade x ray field Chapter 4 Pertormance Compliance Checks and Adjustment Procedures 4 15 3 2 Light Field llluminance Check and Adjustment Intensity and consistency of the Light Field is checked by performing the following procedure 1 Place a light meter probe at position A Figure 4 6 on the IRSD with its sensor fac ing up 2 Take a background light reading with the light field lamp OFF and record the results Take a light reading with the light field lamp ON and record the results 3 Convert both readings to lux values use the
146. igh Voltage Generator M IV 1 003 0266 Assy Host Microprocessor Board 1 003 0354 Assy Mains Power Board 1 070 5019 Fuse 1 32A SB 250V F1 Mains Power Board Fuse 1 2A SB 250V F2 Mains Power Board Assy Motor Lamp Control Board Figure 7 1 Assy Power Distribution Figure 7 1 Assy Power Distribution Board Figure 7 1 Assy Power Supply Interconnect Board Figure 7 1 Assy Rotation Display Board Figure 7 1 Assy Rotor Control Board Figure 7 1 Assy VTA Motor Driver Board Figure 7 1 1 003 0347 Assy 15V Power Supply StereoLoc II ready units only Figure 7 1 Figure 7 1 Figure 7 1 Figure 7 1 Figure 7 1 Figure 7 1 Chapter 9 Parts List 9 3 M IV Table 9 4 Miscellaneous Tools Items TABLE 9 4 MISCELLANEOUS TOOLS ITEMS PART NUMBER DESCRIPTION 9 061 0106 Tool 1 4lb Belt Adjustment 2 580 0506 Adhesive LOCTITE 242 Blue 2 580 0203 Grease Synthetic 9 200 0426 Kit M4 Poweraid Upgrade Mobile application only 2 580 0207 Grease Mobile XHP222SPCL 9 4 Chapter 9 Parts List M IV Service Manual Appendix A Specifications 1 0 M IV Series System Specifications The following section details the M IV Series specifications including performance specifications x ray tube and exposure specifications compression specifications and beam limiting specifications 1 1 Electrical Input Specifications Mains Voltage 200 208 220 230 or 240 VAC nominal tap selectable at installation 10 50 60 Hz permanently
147. ighlight the data field 2 Enter the desired value between 1 and 19 then press Enter to record the change 3 4 15 Setting Awuto ID Offset Use this data field to adjust the distance from the edge of the film that the AutoFilm ID flashes the label Higher values move the label farther from the edge while lower values move it closer to the edge 1 Highlight the data field 2 Enter the desired value between and 7 then press Enter to record the change 3 4 16 Setting Daylight Savings Time Use this data field to permit the system to automati cally adjust the time display for the daylight savings time season The only choices for this field are YES or NO Chapter 3 System Setup M IV 3 4 17 Service Manual Default Settings Exposure Techniques Use the area along the bottom of the screen to define the exposure parameters that will appear as defaults in the Run Mode s Exposure Technique Window A unique set of parameters may be chosen for each exposure mode Table 3 11 details the exposure parameters available for each exposure mode Table 3 11 Exposure Mode Parameter Matrix TECHNIQUE Filter kV PARAMETER Molybdenum Mo or Rhodium Rh 20kV 35kV Mo 28kV 39kV Rh mAs Table 1 8mAs 500mAs 23 steps 2 3mAs 500mAs 59 steps Density not selectable Spot Large or Small Film Filter kV 1 of 3 film screen combinations calibrated Molybdenum Mo or Rhodium
148. ilter are factory set at 30 kV and zero kV respectively The Auto Filter kV Threshold setting is the kV value that results in pro ducing images with essentially the same image con trast regardless of the beam filter used Mo or Rh At this kV the patient dose may be reduced by use of the Rh filter without a reduction of image quality This Auto Filter kV Threshold value is dependent on several factors including compressed thickness breast composition screen film speed and the x ray spectra The nominal setting is 30 kV However it may be set at 29 through 32 kV at installation In addition to the kV Threshold selection the change over kV may be altered downward by 1 kV 1 kV Offset selection This selection results in Rh filter imaging at 1 kV less than if the image was taken with the Mo filter This results in improved image contrast However the patient dose reduction is not as much as it would be with no kV Offset If the need arises to change these values the proce dure to do so is as follows 1 Set the Host Microprocessor to the calibra tion mode S6 switch 4 ON 2 Set the Rotary Switch for the Auto Filter kV Threshold and Offset selection S4 to posi tion 6 and S6 switch 8 ON 3 On the Host Microprocessor press Select 52 until the desired setting appears i e Auto Filter kV Threshold or Auto Filter Off set then press S3 to decrease the value or S5 to increase the value 4 Set the Host Microproce
149. inflict on electronic components Check Always wear a grounded electrostatic dis e Section 4 9 Check Light Field Edge charge strap when handling static sensitive Contrast components e Section 2 1 Half Value Layer Check e Section 2 2 Reproducibility and Linear 1 Remove the top and bottom tubehead cov ity Manual Mode Check ers Locate the Tubehead Microprocessor e Section 5 2 X ray Tubehead Leakage Board which is mounted to the Tubehead Check Motor Driver Board beneath the tubehead frame to the rear of the beam limiting assembly 2 Remove the hardware that secures the Tube head Microprocessor to the standoffs attached to the Tubehead Motor Driver Board 3 Carefully pull the connector on the Tube head Microprocessor from its mating socket on the Tubehead Motor Driver Board 4 Disconnect all cables from their connectors on the Tubehead Motor Driver Board Note each location for replacement 5 Remove the hardware that secures the Tube head Motor Driver Board to the tubehead frame Carefully remove the board from the tubehead Figure 8 9 Tubehead Processor and Motor Control Boards Removal 8 8 Chapter 8 C arm Assembly Maintenance 3 0 Remove and Replace Compression Components Before performing any remove and replace procedure ensure that all electrical safety precautions are met Power down the unit set the circuit breaker to OFF then disengage the voltage source Perform the applicable lock ou
150. justments and exposures as necessary to obtain the 0 12 OD from the mean OD requirement Always save the val ues after making a change Record the value on the Performance Test Worksheet Table 3 18 Replace the 2 cm phantom material with the 4 cm phantom material Using the same techniques make an exposure develop the film then measure the Optical Density Press S2 until the OFFSET value appears on the display Modify the value to increase or decrease the Optical Density S3 and S5 Increasing the OFFSET decreases the Opti cal Density decreasing the OFFSET increases the Optical Density Make an exposure develop the film then measure the Optical Density Repeat the OFFSET adjustments and exposures as nec essary to obtain the 0 12 OD from the mean OD requirement Record the value on the Performance Test Worksheet Table 3 18 Replace the 4 cm phantom material with the 3 cm phantom material make an expo sure develop the film then measure the Optical Density Make sure that the Optical Density reading is within x0 12 OD of that at 4 cm Record the value on the Perfor mance Test Worksheet Table 3 18 Repeat the entire procedure for each kV sta tion 25 kV to 30 kV being calibrated Chapter 3 System Setup Service Manual Table 3 18 Performance Test Worksheet Small Focal Spot Mo For these kV values 3 cm or greater may be required 5 2 5 Input AEC Values 20 kV 24 kV and 5 2 6 AEC Calibra
151. kV or Auto Filter this data line reads Auto kV Window and the system determines the exposure factors neces sary to make films at the optimum optical density with ideal contrast To do this the user must set a timing window that determines when to terminate the exposure In Auto kV mode three manual 125 165 and 200 mAs and one automatic 200 mrad timing window can be selected In Auto Filter mode there is only one manually selectable window 200 mAs available along with the automatic 200 mrad window The Auto kV and Auto Filter operation principles are to select a kV or kV filter combination so that the final exposure in mAs will not exceed the pre selected mAs window value Chapter 3 System Setup M IV 3 3 8 1 Manual Timing Windows The Auto kV manual timing window selections vary depending on the whether Large or Small Spot is selected The Large Spot manual timing window choices are 125 165 and 200 mAs the Small Spot timing window choices are 38 50 and 60 mAs When one of the manual timing windows is set for Auto kV or Auto Filter Modes the system termi nates an exposure using the following criteria Priority 1 The first priority of the system is to ensure optimum optical density on the developed film If necessary to meet the optical density requirement the system increments the kV to its maximum and surpasses the set timing window Priority 22 When the system determines that the optic
152. kness Cali bration before releasing the unit to the user Chapter 8 C arm Assembly Maintenance M IV 6 6 Compression Accessory Detect Board Verification A strip of tape on the rear of each Compression Paddle blocks the 4 optical sensors on the Compression Accessory Detect Board The strip is patterned using reflective and non reflective material Blocking an opti cal sensor with reflective material causes that sensor to generate a logic high signal blocking it with non reflective material keeps the sensor at a logic low The combination of these highs and lows generate the signals which are used to determine the attached com pression accessory Use Table 8 9 to verify the optical sensor combinations for each Compression Paddle Note that H signifies a logic high reflective while L signifies a logic low non reflective Table 8 9 Accessory Sensor Combinations ISO1 ISO2 ISO3 ISO4 T I T t 6 7 Image Receptor Detect Board Verification A strip of tape on the rear of each image receptor blocks the four optical sensors on the Image Receptor Detect Board The strip is patterned using reflective and non reflective material Blocking an optical sensor with the reflective material causes that sensor to generate a logic high signal blocking it with the non reflec tive material causes the sensor to remain at a logic low The combination of these highs and lows generate the signals which are u
153. l M IV 5 2 The Gantry and C Arm Legend for Figure 1 2 The Gantry is the main support for the C arm and tubehead assembly It is permanently connected to the input power source and supplies power to all amp Tienes Controls unit subsystems through an isolation transformer ace Shica The following components or subsystems are found 5 Compression Displays and AEC Position in the Gantry Display 6 Compression Device Exposure Control Electronics 7 Emergency OFF Switch 2 e High Voltage Generator 8 IRSD Cam Rotation Drive 9 Dual Function Footswitch Cam Vertical Drive 10 Patient Handle e Power Distribution Input Power Circuit it Carer Controle Breaker 12 C arm Pivot Tube Vertical Travel Assembly 13 Circuit Breaker rear of gantry The M IV C arm which suspends from the pivot 14 Footswitch Receptacles rear of gantry tube on the Gantry is made up of the following 15 C arm Rotation Control rear of IRSD components or subsystems 16 AEC Detection Position Handle bottom of X ray Tube Beam Limiting Device Compression Device C arm Controls IRSD Accessory Detect Systems Automatic Exposure Control System Bucky Device Control Refer to Figure 1 2 to identify the Gantry and C arm components Chapter 1 General Information ED 9Uoi r a lt lt IRSD J P q AV 5 A Figure 1 2 M IV Gantry and
154. l Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 1 M IV 16 20 21 2 23 24 If any adjustments are necessary first note the distances required to correct each edge then press S2 Select until the desired col limator blade value displays i e 1 rr 2222 18 x 24 x ray field Large focus rear blade See Table 4 4 for all collimator blade settings Press S5 increase or S3 decrease on the Host to change the value for the dis played collimator blade Note that 10 incre ments on the display equals approximately 1 mm movement at the film plane for the adjusted blade Perform this for each edge requiring change then repeat the exposure Check both films to ensure that each edge falls within the specification stated Repeat the adjustments and verification films as necessary for the 18 x 24 cm field format Remove the 18 x 24 cm Bucky Position a loaded 24 x 30 cm cassette on the IRSD and center it laterally Pull the cassette for ward so that its front edge overlaps the chest wall edge of the IRSD by approximately 3 cm See Figure 4 5 Install the 15 cm format Compression Pad dle then lower the Compression Device so that the Paddle just touches the cassette Place markers i e coins solder etc at each inside edge of the Compression Paddle and secure them in place Set the unit for a Manual mode Large focal spot exposure at 25 kV 50 mAs the
155. lm speed is greater than 170 Please consult your Medical Physicist regarding screen film combinations and the 200 mrad window for specific recommendations Table 3 5 Default DIP Switch S7 Settings SWITCH STATUS FUNCTION 1 ON ower Aid 5 sec delay OFF ormal OT USED NOT USED Z OT USED OT USED see below uto kV Window Options 7 uto kV Window Options I SWITCH SETTING Auto kV Window Options 57 6 57 7 SM HV Enable does not include boost SM HV Enable includes boost I Auto Windows only enabled ON OFF Manual Windows only enabled OFF Manual Windows and Auto Windows enabled Normal Operating Position For sites which must meet the 200 mrad maximum average glandular dose requirement due to either regu lations or site preference and who do not have the option of selecting manual timing window 125 165 and 200 mAs Large Spot and 38 50 and 60 mAs Small Spot For sites not required to meet the 200 mrad maximum average glandular dose requirement and who choose to only have the option of selecting the manual timing window 125 165 and 200 mAs Large Spot and 38 50 and 60 mAs Small Spot sites not required to meet the 200 mrad maximum average glandular dose but which choose to pro vide the option of auto window or manual timing window selection 125 165 and 200 mAs Large Spot and 38 50 and 60 mAs Small Spot 3 4 Chapter 3 System Setup M
156. ly removed covers 1 Make sure system power is OFF Remove the Control Console to access the top shelf components Remove the Console front cover Refer to Chapter 5 Covers Panels Fuses and Jumpers for cover removal proce dures 2 Slip the D sub connector of the Reader Wand through the cutout in the right side of the Control Console Route the connector around the back side of the AutoFilm ID Assembly 3 Slip the Reader Wand connector through the access hole in the rear of the top shelf then route it downward toward the Opera tor Microprocessor Board Attach the con nector to TJ24 on the Operator Microprocessor 4 Secure the Reader Wand Cord to the exist ing wiring harness using several cable ties Figure 2 7 Installing the Bar Code Reader 2 8 Chapter 2 System Installation 3 0 M IV Interconnections The following procedures detail making the connections between the Gantry and the Operator Console and how to connect the unit to power Refer to Figure 2 8 throughout the following 3 1 Interconnections Gantry to Console At the rear of the remote console connect one end of the power cable Item 1 Figure 2 8 to the Power In receptacle Item 2 Figure 2 8 on the console connector panel At the rear of the Gantry remove the lower rear gantry cover Route the free end of the power cable by the pre installed conduits wire runs to the Gantry Fasten the power cable connector to the J2 C
157. m ID flashes for film type 2 The entry procedure is the same for all three Flash Times Flash Time fields must be backspaced to clear old screen film information 3 4 8 Use this data field to type in the length of time that the AutoFilm ID flashes for film type 3 The entry procedure is the same for all three Flash Times Flash Time fields must be backspaced to clear old screen film information Setting Flash Time 3 Chapter 3 System Setup Service Manual 3 4 9 Use this field to change the date display which appears in the Run Mode The date format depends on the DIP Switch setting on the Microprocessor Board e DIP S1 switch 3 OFF MM DD YYYY USA format e DIP S1 switch 3 DD MM YYYY International format setting Date 1 Highlight the Date data field then use the Backspace key to delete the displayed date 2 the new date in the selected format shown above 3 Press Enter to complete the change Note The day of the week will show to the right of the Date data field 3 4 10 Use this data field to change the time display which appears in the Run Mode The format of the time display is selectable e HH MM AM PM 12 hour format e HH MM 24 hour format Setting Time 1 Highlight the Time data field then press Change to select the desired format 2 Use the backspace key to delete the dis played time then type in the new time in the proper format shown above
158. mains exactly one meter for each measurement position Note Any reading above 45 0 mR is unacceptable Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 23 M IV 6 0 Error Code Displays The M IV control console displays error codes using a two digit base ten numeric system Table 4 6 describes each of the M IV error codes and messages that appear on the Run Mode screen Table 4 6 Error Codes MESSAGE DESCRIPTION ORIGIN Exposure switch released early Operator Exposure time required exceeded software back up time Generator Microprocessor 500 mAs back up timer Auto Time Auto kV and Auto Filter modes Image Receptor Microprocessor X ray switches not released during post exposure routine Host Microprocessor Ensure switches are not stuck X ray switches are closed during unit power up Release and Host Microprocessor ensure switches are not stuck HTC only minimum time for grid operation is 400 ms Host Microprocessor Rotor Error Check tube for overheat rotor fault or open Rotor Control thermal switch Check 525 VDC of rotor control board Check Fuse F21 on DC fuse panel Check rotor control board EPROM Start from Host withou x ray switch fault Host Microprocessor Tube Arc Fault kV arc detected Fault diode D19 kV High Voltage Control control board Tube Overcurrent mA level more than 12 5 higher than High Voltage Control set mA level Fault diode D15 kV c
159. me Item 2 Figure 2 4 Lift the mount out of the console 3 Install the console display Item 3 Figure 2 4 onto the mount then attach the ground wire provided 4 Route the console display cables through the slot in the console top shelf 5 Connect the Console Display ribbon cable to TJ28 on the Operator Interface Micropro cessor Board Item 4 Figure 2 4 6 Connectthe backlight connector to TJ27 on the Operator Interface Microprocessor Board 7 Connect the keyboard LED cable to P4 part of the sub panel cable harness in the front component compartment Item 5 Figure 2 4 8 Align the holes the display and mount with the holes in the console frame Install and tighten the mounting hardware 9 Replace the Operator Console control panel as per Chapter 5 Section 2 1 e vie A Z lt Figure 2 4 Installation Console Display Chapter 2 System Installation 2 5 IV x Service Manual 2 3 Installation Footswitches The system permits attachment of two dual function footswitches that plug into receptacles inside the Gantry Use the following procedure to install the footswitches WARNING To avoid accidental footswitch activation DIGITIZER keep both footswitches clear of the patient and C arm setup area 1 Remove the lower rear panel from the Gan try by removing the six cover screws 2 the footswitches to the left and right foot
160. ment e Chapter 3 Section 5 0 Automatic Exposure Control Calibration all Disconnect the RJ45 jack from AGJ5 on the board Disconnect 40 pin ribbon cable from AGJ4 Lift the Generator MPU Board off of the e Chapter 4 Section 2 0 X ray System Performance all e Chapter 4 Section 4 2 M IV Bucky Device HTC Grid Performance Check mounting standoffs 7 Reverse procedures to replace the Genera tor Microprocessor Board Chapter 4 Section 4 3 Maximum mAs 8 Perform the following procedures before in Auto Time Mode Performance Check returning unit to service e Chapter 7 Section 5 1 H V Control e Chapter 3 Section 4 4 Tube Current Board Over Current Over Voltage mA Adjustment Adjustment e Chapter 3 Section 4 5 Tube Voltage Potential kV Adjustment e Chapter 3 Section 5 0 Automatic Exposure Control Calibration all e Chapter 4 Section 2 0 X ray System Performance all e Chapter 4 Section 4 1 M IV Bucky Device Linear Performance Check if applicable e Chapter 4 Section 4 2 M IV Bucky Device HTC Grid Performance Check if applicable 7 4 Chapter 7 Gantry Maintenance M IV 2 3 Filament Control Board Always remove power before performing any removal or replacement procedure Access the Fila ment Control Board by opening the left side Gantry door CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electro
161. n paddle on the compression device Chapter 8 C arm Assembly Maintenance 8 6 3 Center 5 cm of B E M the Magnification Table and orient it so that it is even with the chest wall edge of the image receptor Move the compression device down until the compression force display indicates 30 pounds of force 133 5 N On the Host Microprocessor press S1 to calibrate the compression thickness for the installed pad dle receptor combination Raise the compression device off of the B E M then lower it again until the force reading indicates 30 Ib 133 5 N Verify that the thickness reading indicates 5 cm Compression Chain Tension Adjustment Perform this procedure after servicing or replacing the Compression Motor Brake assembly or the Com pression Clutch Brake assembly 1 Remove the lower Compression Device cover Use care not to damage the bellows Manually move the Compression Device completely UP Loosen the hardware A that secures the lower compression chain sprocket mount to the C arm frame refer to Figure 8 21 Adjust the sprocket tension screws B appropriately so that the chain deflection near the center is approximately 1 2 inch Adjust both tension screws evenly Tighten the sprocket mount hardware A Manually move the Compression Device completely down then back up Verify that the travel is smooth and that the chain does not bind Use motorized compression to move
162. n make the exposure Remove the cassette and develop the film Check the film on each of the non chest wall edges for white space The x ray field at each of these edges MUST BE within 196 of SID from each edge 6 5 mm Check the film for proper chest wall edge overlap The x ray field MUST minimally reach the chest wall edge O mm but MUST NOT exceed the marker by more than 13 mm 5 mm nominal If any adjustments are necessary first note the distances required to correct each edge then press S2 Select until the desired col limator blade value displays i e 2 rr 2222 15 cm x ray field large focus rear blade See Table 4 4 for all collimator blade set tings Service Manual 25 26 27 Press S5 lt increase gt or S3 lt decrease gt on the Host to change the value for the dis played collimator blade Note that 10 incre ments on the display equals approximately 1 mm movement at the film plane for the adjusted blade Perform this for each edge requiring change then repeat the exposure Repeat the adjust ments and verification films as necessary for the 15 cm field format Perform steps 18 through 26 for the 10 cm x ray field size then again for the 7 5 cm x ray field size ALWAYS use the large focal spot for all exposures BE SURE to enter the exact value for the front collimator blade for all field sizes IMAGE RECEPTOR SUPPORT COMPRESSION PADDLE 15cm 10cm 7 5cm CHES
163. nal of the Voltage Divider to chassis ground on the Gantry Connect the free end of the High Voltage Adapter cable to the high voltage receptacle well on the High Voltage Multiplier item 2 Figure 3 6 Push the adapter cable into the receptacle well until it is firmly seated 4 Turn the system ON Set the system for a 30 kV 160 mAs Manual mode exposure While monitoring the meter from behind the protective radiation shield take an exposure 5 Confirm that the meter reading falls into these ranges 2 94 3 06 volts using a 10 000 1 divider 29 4 30 6 volts using a 1 000 1 divider 3 24 Service Manual 6 Ifthe voltage reading is more than 2 of the kV setting adjust R18 on the High Voltage Control Board clockwise to increase coun terclockwise to decrease may be necessary to adjust R18 so that the voltage reading for the 30 kV exposure is within 1 of the kV setting to ensure that the remaining kV levels fall within the 2 tolerance Re check the mA output if R18 is adjusted 7 Repeat the exposure and adjustment as nec essary to achieve the required voltage read ing 8 Selectintermediate kV settings and confirm that the meter readings are within 2 o their kV settings mAs Bananna Jack 2 High Voltage Test Well 29 02 TINS 7 I Figure 3 6 Test Well and Banana Jack High Volt age Inverter Chapter 3 System Setup IV Service Manual 5 0 A
164. nd inspect the gear assembly for loose hardware 4 Check harnesses for proper dress and clear ances 5 Clean and lightly lubricate C arm rotation gear assembly if required using approxi mately 1 tablespoon of synthetic type lubri cant LORAD PN 2 580 0207 Apply lubricant with brush ensuring gear teeth and worm gear are evenly coated Turn power ON 7 Rotate C arm through full operational travel Remove any excess lubrication 8 Replace Upper Rear Access Panel Chapter 7 Gantry Maintenance Service Manual 3 5 2 VTA Lead Screw Inspection and Lubri cation The recommended periodicity for this procedure is annually or as required any time the left front cover is off the unit for service the VTA lead screw should be inspected Turn power OFF 2 Remove the Gantry Left Front Cover as per Chapter 5 Section 2 2 Steps 1 through 4 do not remove right front cover 3 Locate and inspect the VTA lead screw for loose hardware 4 Check harnesses for proper dress and clear ances 5 Clean and lightly lubricate the VTA lead screw if required using approximately 2 tablespoons of synthetic type lubricant LORAD PN 2 580 0207 Evenly coat all metal surfaces Turn power ON 7 Raise C arm to top of vertical travel Lower C arm to bottom of vertical travel Remove any excess lubrication 8 Replace Gantry Left Front Cover 7 13 M IV 4 0 Test Points Use the following test point tables as a
165. ndling static sensitive components 5 1 Filament Protection Board Table 8 3 shows the test points and their voltages signals on the Filament Protect Board When taking mea surements connect the voltmeter ground appropriately according to the table below Table 8 3 Filament Protection Board Test Point Voltages Voltage Signal GND TP TP Voltage Signal GND TP TSTPT GRID TSPT MA TSPT GND TP4 TSTPT SM TSTPT LG TP 5 2 Tubehead Microprocessor Table 8 4 shows the test points and their voltages signals on the Tubehead Microprocessor When taking mea surements connect the voltmeter ground appropriately according to the table below Table 8 4 Tubehead Microprocessor Test Point Voltages TP Voltage Signal GND TP TP Voltage Signal GND TP D2ACLK P41 D2AIN 41 FILTER P41 MIRROR TP44 F pat C TPA DGND pat Chapter 8 C qrm Assembly 8 17 M IV 53 Tubehead Motor Driver Board Table 8 5 shows the test points and their voltages signals on the Tubehead Motor Driver Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 8 5 Tubehead Motor Driver Board Test Point Voltages Voltage Signal GND TP TP Voltage Signal GND TP TP34 5 4 Compression AEC Position Display Table 8 6 shows the test points and their voltages or signals on the Compression AEC Position Display Boa
166. ns Power Board Test Point Voltages 7 17 Table 7 8 Switch Test Points 7 17 Table 7 9 Table 7 10 Table 7 11 Table 7 12 Table 7 13 Table 7 14 Table 7 15 Table 8 1 Table 8 2 Table 8 3 Table 8 4 Table 8 5 Table 8 6 Table 8 7 Table 8 8 Table 8 9 Table 8 10 Table 9 1 Table 9 2 Table 9 3 Table 9 4 Table A 1 C arm Microprocessor Board Test Point Voltages 7 17 Host Microprocessor Board Test Point Voltages 7 17 Motor Lamp Control Board Test Point Voltages 7 18 VTA Motor Driver Board Test Point Voltages 7 18 Rotation Display Board Test Point Voltages 7 18 15 V Power Supply Board Test Point Voltages 7 19 Power Distribution Board Test Point Voltages 7 19 T benead Controller 8 3 Filament Protection Board Cables 8 6 Filament Protection Board Test Point Voltages 8 17 Tubehead Microprocessor Test Point Voltages 8 17 Tubehead Motor Driver Board Test Point Voltages 8 18 Compression AEC Position Display Test Point Voltages 8 18 Image Receptor Microprocessor Test Point Voltages
167. nt Data 3 3 13 Default Setting Variable Speed Compression The Variable Speed Compression Feature establishes the rate at which the compression device moves down and can be adjusted in 10 steps displayed in the range of 00 to 90 Set compression speed default as follows Open M IV Gantry right door 2 On the Host board set S6 switch 4 Item 7 Figure 3 1 to ON to enable calibration 3 Rotate 54 Item 1 Figure 3 1 to position 5 and set S6 switch 8 to ON 4 Press S2 Item 4 Figure 3 1 twice to display the compression speed calibration on the LED display pad Item 2 Figure 3 1 5 Verify that the displayed speed can be adjusted in 10 steps using 53 to increase and 55 to decrease Items 5 and 6 Figure 3 1 6 Setthe compression speed default to 8096 using 53 and S5 as necessary 7 Press S1 Item 3 Figure 3 1 to save com pression speed default 8 Set 56 switch 4 to OFF to disable calibra tion 3 3 14 Default Setting Density Step Front panel density steps 696 8 10 and 12 5 can be selected The default selection is 1096 Set the density step default as follows Open M IV Gantry right door 2 On the Host board set S6 switch 4 Item 7 Figure 3 1 to ON to enable calibration 3 Rotate 54 Item 1 Figure 3 1 to position 3 and set S6 switch 8 to ON to display the density step on the LED display pad Item 2 Figure 3 1 4 Set density step to desired percent using S3 to increase and
168. ntry upper rear access hole Reverse this procedure to reinstall the C arm Rotation Drive Motor and Gearbox Assembly Turn power ON Verify the C arm Rotation Drive Motor and Gearbox Assembly is working properly before releasing the unit to the user refer to Chapter 3 Section 2 2 Steps 3 and 4 Service Manual e ae Figure 7 4 C arm Rotation Drive Motor and Gear box Assembly Removal Chapter 7 Gantry Maintenance IV Service Manual 3 3 C arm Vertical Drive Motor and 11 Verify that the C arm Vertical Drive is work Gearbox Assembly ing properly before releasing the unit to the user refer to Chapter 3 Section 2 2 Steps 1 1 Remove the Gantry left front cover as per and Chapter 5 Section 2 2 Steps 1 through 3 2 Remove the upper rear Gantry panel as per Chapter 5 Section 2 2 Steps 8 and 9 3 Position C arm so the C arm Vertical Drive Motor and Gearbox Assembly Item 1 Fig ure 7 2 is accessible through the Gantry upper rear access hole Turn power OFF 5 From rear of unit disconnect the motor power cable from the wiring harness Cut all cable ties securing the harness to the motor and gearbox assembly 6 From front left side of unit at bottom of C arm drive pulley coupler Item 1 Figure 7 5 remove 2 hex head bolts 7 Insert lever or pry bar between the C arm drive pulley coupler and the C arm drive pulley Item 2 Figure 7 5 Using lever push down on the coupl
169. oard Table 7 9 shows the test points and their voltages or signals on the C arm Microprocessor Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 9 C arm Microprocessor Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 1 TP2 m2 TP3 CLK 4 SEL TP2 TP5 TP2 TP6 TP2 7 2 8 2 TP9 TP2 TP2 4 8 Host Microprocessor Board Table 7 10 shows the test points and their voltages or signals or the resistance on the Host Microprocessor Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 10 Host Microprocessor Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 1 R W TP2 TP3 TP5 TP6 7 TP8 _ 8RN_ 2ORIN j _ L U373 Chapter 7 Gantry Maintenance 7 17 IV x Service Manual 4 9 Molor Lamp Control Board Table 7 11 shows the test points and their voltages or signals or the resistance on the Motor Lamp Control Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 11 Motor Lamp Control Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND N A M 5 p e __ 4 10 VTA Moto
170. oard Figure 8 18 1 003 0293 Assy Image Receptor Microprocessor Board Figure 8 19 4 000 0039 Assy Mirror Filter 3 441 0010 Rod Bellows 2 230 4001 Timing Belt 3 32 x 32 PIT 1 003 0474 Assy Tubehead Motor Driver Board 1 003 0300 Assy Tubehead Microprocessor Board 4 000 0292 Assy Tubehead Switch Left 4 000 0291 Assy Tubehead Switch Right Kit X Ray Tube Toshiba E7290A Kit X Ray Tube Varian M113R 9 400 0212 Kit X Ray Tube Varian M113R Elite Figure 8 5 9 2 Chapter 9 Parts List M IV Table 9 3 Gantry Replacement Parts TABLE 9 3 GANTRY REPLACEMENT PARTS PART NUMBER DESCRIPTION NUMBER 1 003 0334 Assy C Arm Microprocessor Board Figure 7 1 1 003 0333 Assy Filament Control Board Figure 7 1 3 000 5020 Assy Footswitch Figure 1 2 4 000 0233 Assy Footswitch Connector Figure 2 5 1 070 1119 Fuse 30A 600V FB F19 F20 Power Dist Figure 5 9 1 070 1114 Fuse 15A 600V FB F17 F18 Power Dist 1 070 1332 Fuse KLK D25A 600V F22 Power Dist Figure 5 10 1 070 1333 Fuse Fast Acting 8A 600V F21 Power Dist Figure 5 10 1 070 1083 Fuse SB 8A 250V F23 F25 Power Dist Figure 5 10 1 070 1080 Fuse SB 5A 250V F11 F12 F15 F16 F24 Power Dist Figure 5 9 5 10 1 070 1072 Fuse SB 2A 250V F4 Figure 5 9 1 070 1275 Fuse SB 10A 250V F1 F2 F5 F6 F7 F8 F9 F10 Figure 5 9 1 070 1079 Fuse SB 4A 250V F13 F14 Figure 5 9 1 003 0335 Assy Gen Microprocessor Board Figure 7 1 4 000 0014 Assy H
171. ode data field All release functions including automatic compression release are disabled if the Localization paddle is installed Automatic Compression Release Moves the compression device to a distance of 5 cm 7 5 cm 10 cm or 12 5 cm selected upon installation For Mag this may be less Backdrive After Compression Does not exceed 1 5 mm in either motor ized or manual drive between 90 0 and 90 positions and no greater than 3 mm at all other positions Compression Down Motion Variable Speed Selectable between approximately 10 through 100 of full speed and displayed on host microprocessor as 0 through 90 in increments of 10 Compression Force Display LED Display on Compression Device shows the compression force through the range of 10 Ib to 67 4 labs 44 5 N to 300 N Compression Force Display Accuracy Display accuracy of 4 5 labs 20 N Compression Thickness Display Two LED Displays on Compression Device measures between 0 and 15 cm above image receptor The displays compensate for type of image receptor installed i e no receptor cassette holder Bucky and magni fication device Display is in 0 1 cm incre ments The display is visible from both sides of the patient Appendix A Specifications Service Manual Compression Thickness Accuracy 0 5 cm for thicknesses between 0 5 cm and 15 cm Compression Paddles Compression paddles are transparent and the full field paddl
172. ogic Inc and LORAD A Hologic Company in the United States and other countries Service Manual for M IV Series Mammography Systems Second Edition Part Number 9 500 0276 Revision 004 This manual applies to M IV Mammography Systems manufactured after August 2001 For systems manufactured before August 2001 use part number 9 500 0170 Manufacturer EU Representative LORAD Hologic NV 36 Apple Ridge Road 0044 Horizon Park Danbury CT 06810 USA Leuvensesteenweg 510 Bus 31 www lorad com 1930 Zaventem Belgium M IV REVISION HISTORY REV DATE MODIFICATION PAGES AFFECTED Rev 1 8 22 2001 Initial Release of 2 Edition ALL Rev 2 9 05 2001 Incorporated review comments ALL Revised specifications Manual restructuring Rev 3 11 20 2002 Revised specifications Illustration 1 9 A 7 Rev 004 10 6 2003 Clarified specifications A 7 M IV IV Service Manual Table of Contents Preface 1 0 Using the Service Xix 1 1 Warnings Cautions and 20 Chapter 1 General Information LO Intended SB a oss 1 1 2 0 Introduction 1 1 330 Unit DESCON sess sadaa sapa sus aa 1 1 3 1 Required Tools and Equipment 1 2 2 M T rDP 1 3 4 1 Electrical Safety 1 3 4 2 Static Electricity and Magnetic Field Safety
173. ography units isolation transformer is configured at the factory to A match the voltage specified at the time the unit was ordered OPI Wu MP lt gt 3 sure the unit is OFF and that the input E power cord is detached from the mains N 4 Remove the Gantry s lower rear panel to access the input power terminal block 5 Verify the isolation transformer taps are wired to match the previously measured source voltage if not configure the isola O tion transformer input wiring and tap as lt shown in Figure 2 9 6 Verify that the line impedance does not an exceed 0 16 ohms 200 V line or 0 2 ohms for all other input voltages 208 V 220 V 230 V or 240 V Note The above requirements are met if the unit is operated on a line with no greater than 3 voltage drop under maximum lt operating load Large Focal Spot 32 kV Z Exceeding this requirement necessitates corrective action by the site Figure 2 9 Input Power Configuration Chapter 2 System Installation 2 11 M IV Perform the following to attach the system to a source of power 1 Connect the input power cord Item 14 Fig ure 2 8 to the input power terminal block Irem 13 Figure 2 8 on the rear of the Gan try Refer to Figure 2 10 2 Permanently wire the opposite end of the input power cord to a disconnect panel 3 Replace the lower rear Gantry cover tc 2 Oz Lu O OO a r lt LL CAUTION T
174. ometer Note The compression thickness MUST BE calibrated for each of the compres sion paddle image receptor combina tions used with the machine i e 18 x 24 cm Paddle with M IV Bucky If the user wishes to use a compression pad dle with a different image receptor that paddle receptor combination MUST BE calibrated by performing the procedure that follows If not already done apply power to the M IV system then open the right side Gantry door Set the Host Microprocessor for Cali bration Mode S6 switch 4 2 ON Select Motor Control calibration by placing S6 switch 8 2 OFF and turning the rotary switch S4 to position 5 On the Host Microprocessor toggle switch S2 until the Host Display reads Cht 2 If not already done install the 18 x 24 cm Bucky device and 18 x 24 cm paddle onto the compression Device Center 5 cm of B E M on the IRSD and ori ent it so that it is even with the chest wall edge of the image receptor Move the com pression device down until the compression force display indicates 30 pounds of force 133 5 N On the Host Microprocessor press S1 to calibrate the compression thickness for the installed paddle receptor combination Raise the compression device off of the B E M then lower it again until the force reading indicates 30 16 133 5 Verify that the thickness reading indicates 5 cm Remove the Bucky device and install the Magnification Table Install a magnificatio
175. onsole Power receptacle Item 3 Figure 2 8 on the Gan try connector panel Connect one end of the data cable Item 4 Figure 2 8 to the Host to Micro Comm receptacle Item 5 Figure 2 8 on the con sole connector panel Route the free end of the data cable by the pre installed conduits wire runs to the Gantry Fasten the data cable connector to the J1 Console Data receptacle Item 6 Figure 2 8 on the Gantry connector panel Fasten the data and power cable ground wires 4 wires Item 7 Figure 2 8 and the Gantry to Console ground wire to the appropriate ground studs Items 8 and 9 Figure 2 8 For systems with the optional Label Printer connect the printer s data cable connector to the Printer parallel port Item 10 Figure 2 8 on the Console connector panel Con nect the printer power cable to local power For systems with optional DSM connect the DSM data cable connector to the DSM port Item 11 Figure 2 8 on the console connector panel Connect the DSM power cable to local power Install the cable cover set aside during radi ation shied installation procedures on the base of the Operator Console Chapter 2 System Installation Service Manual Legend for Figure 2 8 N F 10 11 12 13 14 15 Power Cable Power In receptacle J2 Console Power receptacle Data Cable Host to Micro Comm receptacle J1 Console Data receptacle Data and Power Cable G
176. ontrol board kV level Fault diode D14 kV control board High Voltage Inverter overcurrent fault Fault diode D18 kV High Voltage Inverter control Board Filament overcurrent fault Filament current levels exceeded 12 5 of the set level Fault diode D2 filament control board Filament overvoltage fault Filament voltage levels exceeded 12 5 of the set level Fault diode filament control board Filament grid error Grid voltage error detected Fault diode mA Control D1 filament control board Error in Data from Host Error may indicate software lockup Image Receptor Microprocessor with the host High Voltage Inverter mA Control mA Control Chapter 4 Performance Compliance Checks and Adjustment M IV Table 4 6 Error Codes Continued DESCRIPTION ORIGIN System Error 31 Hardware backup timer If auto mode check IR Generator Microprocessor microprocessor If in manual mode check generator microprocessor System Error 32 Software Timeout Timer greater than 5 seconds Generator Microprocessor System Error 33 Image receptor exposure error Generator did not receive Generator Microprocessor Exposure Enable signal from IR board within 300 ms of Rotor Okay signal from motor control board System Error 34 Focal spot relay fault System Error 35 Tube current is below 10 of expected value Check tube mA Control current level calibration filaments and protective diodes a
177. oo eq Aew 199USMIOA SIU L SI 1591 AHL 0L0 SQ33OX3 d VA 3 4915 dl ALON Aq O INIA 431 SLI ANIA O 431 SHL B gt Q gt D U 3unsOdXa HOV3 ACIAIC 4 9 g snid z z snid WnS ALVINOWO SHIVd AAISSAOONS 9 431 HOV3 HOS E E Sm 2 016 g z z snuiu 3ON3H334Iq IHL 3415779799 m SHIVd JAISSSOONS 431 HOYI HOS par 5 LOVHLANS 9 r N E E aW MH B 3 YIVA SVU SLI Ag duu AHL 380S0dX3 V d31S HOV3 ACIAIC _ jJ dL dL PERO 41009 41007 41005 Syul0Sc 41006 94109 Syu 001 94109 SVWO0 E ONILLAS syw AMSC NAGE NAGZ NAGZ NAGE NAGZ AMSC NAGZ ONILLAS 9 r 2 Sdunsodxd 6 1 SgdufisOdXa 1 34 V AYNSOdxX4 LOdS TVO9Od TIVINS ONISN J 59315 INHOdHZd AYNSOdxX4 LOdS TV9Od 3j9uv 1 ONISN J Y 59315 WdOdddd LASAHSMYOM 1 34 ALIYVANIT 5 7 318V 1 47 Chapter 4 Performance Compliance Checks and Adjustment Procedures M IV 4 8 10 Divide each milliroentgen reading by its corresponding mAs value and record on the Linearity worksheet For each pair of successive tests 20 mAs and 60 mAs then 60 mAs and 100 mAs and so on calculate the difference between each corresponding Step 10 result and record on the Linearity worksh
178. or of the unit Use extreme caution to avoid contacting directly or indirectly through tools any connector pins termi nals or test points Remove all jewelry before working on the unit and avoid wearing loose fitting clothing WARNING Never perform service alone Only service this equipment in the company of someone who is capable of rendering aid should an accident occur 4 2 Static Electricity and Magnetic Field Safety Always be aware of the effects static electricity has on electronic components Take precautions for the safe handling and storage of electronic media CAUTION Electronic components within the unit are extremely sensitive to static electricity ALWAYS use a grounding electrostatic strap when handling these sensitive components CAUTION The floppy diskettes store data magneti cally DO NOT store or place any magnetic media near or on devices which produce magnetic fields or stored data may be lost 4 3 Mechanical Safety e The C arm rotation motor stops upon loss of power and braking is ensured e The Automatic Compression Release Mode is disabled when a Localization Paddle is installed e All C arm functions vertical drive rotation compression up down compression release light field etc are simultaneously operable Vertical drive and rotation are dis abled during the presence of at least 13 Ib of compression force Chapter 1 General Information A 4 4 M IV
179. ot Left Blade light field 15x15 cm Field_ SmallSpot Right Blade light field d5x15cm Field SmallSpot Front Blade light field 1 __9 __ 10x10cm Field_ SmallSpot Rear Blade light field 10 x 10 cm Field Small Spot Left Blade light field rr 10 x 10 cm Field Small Spot Right Blade light field CO 10 x 10 cm Field Small Spot Front Blade light field 6x75cm Field Small Spot Blade lightfield 101 _ 6x7 5cm Field SmallSpot Left Blade light field 6x75cm Field SmallSpot Right Blade light field pone 6x7 5cm Field Small Spot Front Blade light field f L Timet 18x24cm Field SmallSpot Rear Blade ray field L Mitet 18x24cm Field SmallSpot Left Blade x ray field 11 18x24cm Field SmallSpot Right Blade x ray field C L Tift 18x24cm Field SmallSpot Front Blade x ray field C 12 m 18x24cm Field SmallSpot Rear Blade x ray field L 12108888 18x24cm Field SmallSpot Left Blade x ray field L 1209488 18x24cm Field SmallSpot Right Blade x ray field _12 _ 18x24cm Field Small Spot Front Blade x ray field L i13mi f 15x15cm F
180. otentiometer Pins 1 2 and 3 on Figure 7 6 de solder wires Remove 2 screws securing rotation potenti ometer mounting bracket Item E Figure 7 6 to Vertical Travel Assembly VTA Remove bracket with potentiometer attached Note the alignment of potentiometer to mounting bracket Loosen the screw A on the end of the potentiometer shaft B Remove the sprocket assembly C refer to Figure 7 6 Remove the hex nut D that secures the potentiometer to the mounting bracket Slide the potentiometer out of the bracket Reverse steps 3 through 8 to install the replacement sensor Perform the Section 5 3 Rotation Angle Cal ibration procedures Service Manual GANTRY REAR VIEW Figure 7 6 C arm Rotation Potentiometer Removal Chapter 7 Gantry Maintenance M IV 3 5 Gantry Components Preventive Maintenance The following sections provide preventive mainte nance procedures for the following Gantry compo nents e C arm Rotation Gear Assembly part of Item 1 Figure 7 2 e VTA Assembly Lead Screw Item 6 Figure 7 2 C arm Rotation Gear Assembly Inspection and Lubrication 3 5 1 The recommended periodicity for this procedure is annually or as required any time the upper rear cover is off the unit for service the rotation gear assembly should be inspected 1 Turn power OFF 2 Remove the Gantry Upper Rear Access Panel as per Chapter 5 Section 2 2 Steps 8 and 9 3 Locate a
181. overs and the Compression device includes 1 ground wire for each cover Reverse procedures to replace the Compres sion Device Covers Service Manual Figure 5 5 Compression Device Covers Removal Chapter 5 Covers Panels Fuses and Jumpers M IV 2 4 Tubehead Covers Access to the serviceable components and assem blies of the Tubehead are through these covers refer to Figure 5 6 throughout the following e Upper Tubehead Enclosure e Lower Tubehead Enclosure 1 Remove the face shield 2 Remove the decorative logo covers from either side of the tubehead by pulling them out of their locating holes 3 Remove the hardware that fastens the lower tubehead cover to the tubehead frame two rear screws under the decorative logo cov ers two front screws in face shield mount 4 Slide the lower cover down and forward approximately 2 cm then angle it down ward to release Figure 5 6 Tubehead Covers Removal 5 Pull the lower cover off the tubehead to access the following components e Collimator Assembly e Light Field Mirror Assembly e Dual Filter Assembly e Motor Control Board e Tubehead Microprocessor Board e Tubehead Switch Boards 6 Remove the hardware that fastens the upper tubehead cover to the rear tubehead frame located under the decorative logo covers 7 Remove the hardware that fastens the upper cover to the front mounting bracket vertical screws under cover
182. posure using the Large focal spot and the Molybdenum filter Make 10 exposures and record the milliroentgen readings for each exposure 3 Calculate the average milliroentgen reading Subtract each actual reading from the aver age Square each difference Add the squares and divide their sum by 9 Take the square root of the result 4 Divide the number obtained in Step 3 by the average milliroentgen reading The quo tient called the coefficient of variation must be less than 0 05 Service Manual 2 5 Reproducibility Auto Filter Mode Check The following test verifies that the automatic expo sure control system is reproducible in the Auto Filter exposure mode Failure to meet this performance test indicates the need to check the calibration of the Automatic Exposure Control System WARNING Observe all safety precautions while mak ing an X ray exposure 1 Mount a cassette holder with an empty cas sette onto the IRSD Place a 6 cm acrylic phantom on the cassette Position a radia tion probe 10 square cm on top of the phantom Align the probe position with the AEC sensor at front center on the IRSD Use the light field and collimate the x ray field to the approximate size of the probe 2 Set the unit for an Auto Filter exposure using the Large focal spot Make 10 expo sures and record the milliroentgen readings for each exposure 3 Calculate the average milliroentgen reading Subtract each actual readin
183. r Driver Board Table 7 12 shows the test points and their voltages or signals or the resistance on the VTA Motor Driver Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 12 VTA Motor Driver Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND 4 11 Rotation Display Board Table 7 13 shows the test points and their voltages or signals or the resistance on the Rotation Display Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 13 Rotation Display Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND 5V VCC DGND 18 Chapter 7 Gantry Maintenance M IV 4 12 15 V Power Supply Board Table 7 14 shows the test points and their voltages or signals or the resistance on the 15 V Power Supply Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7 14 x15 V Power Supply Board Test Point Voltages TEST POINT VOLTAGE SIGNAL GROUND TEST POINT VOLTAGE SIGNAL GROUND 15V TP2 TP6 DGND Ls TP2 TP6 ROTATEC ARM TP2 TP6 ROTATE C ARM TP2 TP6 DGND Le 4 13 Power Distribution Board Table 7 15 shows the test points and their voltages or signals or the resistance on the Power Distribution Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 7
184. r Mammography technology with a micro processor controlled unit to make a complete diagnostic imaging system The full featured machine provides manual or automatic x ray control and accommodates a full range of options including stereo tactic localiza tion and digital imaging capabilities 3 0 Unit Description The is equipped with a bi angular dual focal spot x ray tube and features four menu driven exposure modes e Manual all exposure factors entered by user e Auto Time system determines exposure duration Auto kV system determines exposure kV and duration e Auto Filter system determines all exposure factors The unit accommodates all LORAD manufactured attachments such as cassette holders Bucky devices Compression Paddles Localization Paddles and the Magnification Table The unit also adapts for use with the LORAD StereoLoc II Localization and Biopsy System and the LORAD DSM Digital Spot Mammography System The unit s modular design separates the operator interface Operator Console and the patient support devices Gantry This permits configuration of the M IV to differing space allotments including installation as a mobile unit M IV Mobile The M IV incorporates multiple microprocessors that control the user interface mechanical operations C arm and collimator movement the x ray generation system and the automatic exposure control system The control system contains built in diagnostic routines th
185. r breast thicknesses between 2 and 8 cm of breast tissue equivalent material Exposure Termination The AEC system determines if the exposure will reach the Backup Time and if so will then terminate the exposure within one of the following limits 1 50 ms 100 ms in Auto kV and Auto Filter modes 2 5 mAs 10 mAs in Auto kV and Auto Fil ter modes 3 with an entrance exposure to the ACR Accreditation Phantom of less than 50 mR 100 mR in Auto kV and Auto Filter modes Indication is made to the operator A man ual reset is required to continue Density Range There are 11 density adjustment steps 5 through 5 These steps are adjustable between 6 8 10 and 12 5 of adjustment mAs values Default setting is 10 and is set upon installation by service engineer Manual Exposure Mode In this mode kV mAs and filter are all selectable When the kV is decreased to 20 kV the mAs will be adjustable from 3 to 100 125 mAs for specimen radiography Service Manual Auto Time Exposure Mode In this mode kV filter and density are all selectable system terminates exposure automatically at the mAs value that will yield the calibrated optical density System displays the Post mAs value after exposure termination and remains displayed until ini tiation of next molybdenum or rhodium fil ter selected The exposure mAs may be modified up to 80 by incrementing the DENSITY func tion If the system determines t
186. rd When taking measurements connect the voltmeter ground appropriately according to the table below Table 8 6 Compression AEC Position Display Test Point Voltages Voltage Signal GND TP TP Voltage Signal GND TP FORCE DGND poe 8 18 Chapter 8 C arm Assembly Maintenance M IV 5 5 Image Receptor Microprocessor Table 8 7 shows the test points and their voltages or signals on the Image Receptor Microprocessor When taking measurements connect the voltmeter ground appropriately according to the table below Table 8 7 Image Receptor Microprocessor Test Point Voltages Voltage Signal GND TP Voltage Signal GND TP AGDN DGDN __ 5 6 Bucky Interface Board Table 8 8 table shows the test points and their voltages or signals on the Bucky Interface Board When taking measurements connect the voltmeter ground appropriately according to the table below Table 8 8 Bucky Interface Board Test Point Voltages Voltage Signal GND TP TP Voltage Signal GND TP AGND NEL MISO HOME MOSI Chapter 8 C arm Assembly Maintenance 8 19 M IV 6 0 Tests Adjustments and Calibrations Service Manual This section covers voltage tests mechanical adjustments and calibrations for the components in the M IV C arm 6 1 Compression Force Calibration Perform this calibration procedure after servicing or replacing the Compression Clutch Assembly or the Compression
187. round Wires Qty 4 Ground Stud Ground Stud Printer Parallel Port DSM Port Isolation Transformer Input Power Terminal Block Input Power Cord Ground Wire 2 9 Service Manual Backside Gantry 4 1i J2 LIE n j Ti 13 WHITE P O 14 i BLACK P O 14 P O 14 iS aan S 14 E Backside Console psm LABEL Optional PRINTER i Optional 11 amp COMPRESSION RELEASE 11 Must be installed on bottom of Ground Connector to meet safety requirements Figure 2 8 Unit Interconnections 2 10 Chapter 2 System Installation IV Service Manual 3 2 Connecting to Power The M IV isolation transformer must be configured to match the power source at the site This portion of the manual details the steps to properly configure and connect the mammography unit to a voltage source Before connecting the unit to a mains dis connect perform the following 1 Measure the voltage at the mains discon nect 2 Inquire as to any history of voltage fluctua tions of voltage related problems that have occurred in other equipment at the site T After determining the input voltage range verify that unit s isolation transformer tap Item 12 Figure 2 8 co is correctly set or re configure the transformer taps Q as required by performing the following Note The mamm
188. rs The Gantry mounts to the floor onto pre installed threaded floor anchors Four floor anchors are required to secure the Gantry to the floor See Fig ure 2 2 Installation Gantry It is the responsibility of the health care facility to ensure that the Gantry mounting points floor anchors meet the federal state and or local building codes for floor mounting and load requirements and all OSHA requirements for safety 1 Move the Gantry into position near the pre drilled floor anchor holes 2 Remove the bolts that secure the Gantry to the shipping dolly then carefully remove the dolly from beneath the Gantry base plate WARNING It will require two people to remove the unit safely from the shipping dolly Figure 2 2 Installation Gantry 3 Carefully move the Gantry so that the base plate mounting holes align over the threaded floor anchors CAUTION AN NEVER maneuver the Gantry by lifting pulling or pushing on the C arm or the tubehead assemblies 4 Level the Gantry by adjusting the threaded Inserts in each of the baseplate mounting holes Chapter 2 System Installation 2 3 IV Service Manual 2 2 Installation Operator Console The Console mounts to the floor onto four pre installed floor anchors threaded It is the responsi bility of the health care facility to ensure that the Console mounting points floor anchors meet the federal state and or local building
189. s 9 through 11 for large focal spot In manual mode reduce mAs below 40 mAs Host will display HTC FIL 14 When complete turn the unit OFF then set the Host Microprocessor for normal opera tion S6 switch 4 2 OFF Remove all test equipment and Bucky then close all covers and panels VALUE TOO HIGH OVERSHOOT NO GOOD Figure 3 5 Waveforms Patterns Chapter 3 System Setup M IV 4 5 Tube Voltage Potential kV Adjustment Checking the Tube Voltage requires using an inva sive high voltage divider a digital voltmeter and an adapter cable to connect the divider to the test receptacle on the unit s High Voltage Generator WARNING This test generates extremely high LETHAL voltages Use all possible precautions to avoid accident or injury WARNING Observe all safety precautions while mak ing an X ray exposure 1 Make sure power is OFF Open the left and right side Gantry doors Allow sufficient time for the high voltage capacitor to dis charge Note red LED D14 on the Inverter board indicates the charge condition of the capacitor while the LED is glow ing the capacitor is charged to over 100 volts Allow the LED to stop glow ing then wait five additional minutes before continuing 2 Connect DC voltmeter to the low voltage terminals of a 10 000 1 or 1 000 1 Voltage Divider Position the meter where it can be read from behind the radiation shield 3 Connect the ground termi
190. s procedure to install the replacement AutoFilm ID assembly Note Before you tighten the mounting 6 6 hardware be sure to align the Auto Film ID assembly with the plastic bezel to form a direct path for cassette inser tion Apply power to the system Set the unit for a short Manual mode exposure 25 kV 3 mAs Manual Mode Large Focal Spot Install a loaded Bucky in the cassette slot Item 6 Figure 6 6 and make the exposure Remove the cassette then insert it into the AutoFilm ID to flash the data onto the film Develop the film and check the flashed data for accuracy If necessary adjust Auto Film ID Contrast the AutoFilm ID Offset and the flash duration for each film type W jp ls ew Service Manual Legend for Figure 6 6 Hardware secures AutoFilm ID to console top shelf AutoFilm ID Hardware mounts plastic bezel to AutoFilm ID Plastic Bezel Console Front Slot Cassette Slot Insulated Ground Strap AutoFilm ID Cassette Guide Assembly AutoFilm ID Base Assembly Figure 6 6 AutoFilm ID Assembly Removal Chapter 6 Operator Console Maintenance M IV 2 6 Floppy Disk Drive The floppy disk drive mounts to a bracket assembly on the inside rear bulkhead of the Operator Console The mounting hardware is accessed by removing the Control Panel 1 10 Remove the Operator Console Control Panel from the Console as per Chapter 5 Section 5 2 1 Steps 6
191. sed to determine the installed image receptor holder Use Table 8 10 to verify the optical sensor combinations for each image receptor Note that H signifies a logic high reflective 3 5 5 0 VDC while L signifies a logic low non reflective 0 5 1 5 VDC Table 8 10 Image Receptor Sensor Combinations 1501 1502 1503 1504 Chapter 8 C arm Assembly Maintenance 8 23 Service Manual 8 24 Chapter 8 C arm Assembly Maintenance _ IV Service Manual Chapter 9 Parts List 1 0 Introduction This Chapter of the manual provides tabular listings of the replacement parts for the M IV Mammography System Part numbers and descriptions are provided for component identification 11 The Replacement Parts Lists The replacement parts list is divided into two parts as follows e Part Number this is the order number for the part The LORAD Service Department will require this number when placing an order e Description identifies the part by name Table 9 1 Remote Console Replacement Parts TABLE 9 1 REMOTE CONSOLE REPLACEMENT PARTS PART NUMBER DESCRIPTION Figure 6 6 1251 5023 1 070 1013 Fuse 4 250V F1 Figure 6 1 1 070 1011 Fuse 2A F2 Figure 6 1 1 070 1007 Fuse 0 5A 250V F4 Figure 6 1 9 400 0099 Kit Mounting Shield and Display M4 Figure 2 6 9 400 0116 Kit Sub Assy Shield Figure 2 6 4 000 0284 Assy Display and Mount Figure 6 5 1 092 0035 Keyboard Operator Interface
192. sette on top of the Bucky Orient the cassette so that it is centered on the Bucky device then rotate it 90 Slide the cassette forward so that it overlaps the chest wall edge by approximately 3 cm Figure 4 4 11 Install the 18 x 24 cm Compression Paddle onto the Compression Device Lower the Compression Device until the paddle just touches the surface of the cassette on the Bucky 12 Secure a marker i e coin solder etc at the front inside edge of the Compression Paddle to accurately mark the chest wall edge of the IRSD 13 Set the unit for a Manual mode Large focal spot exposure at 25 kV 50 mAs then make the exposure Remove both cassettes and develop the films Service Manual 18 x 24 COMPRESSION PADDLE 18 x 24 18 x 24 CASSETTE BUCKY 4 d am B a i D EDGES A B amp C CHEST WALL EDGE D 6 5 13mm 3mm nominal 5mm nominal Figure 4 4 X ray Field Size 18 x 24 cm 14 Check the 18 x 24 cm film from the Bucky on each of the non chest wall edges for white space The x ray field at each of these edges MUST NOT exceed the film edge 0 mm but must be within 1 of SID from each edge 6 5 mm 15 Check the second 18 x 24 cm film for proper chest wall edge overlap The x ray field at the edge with the marker MUST minimally reach the chest wall edge 0 mm but MUST NOT exceed the coin marker by more than 13 mm 5 mm nomina
193. ssion Release Distance is factory set at 10 cm However this distance can be reset to 5 cm 7 5 cm or 12 5 cm Chapter 3 System Setup 3 13 M IV 3 3 4 The collimator device within the M IV tubehead operates in one of two modes MANUAL or AUTO MATIC When the Collimator Mode is set to AUTOMATIC detection circuitry senses the size of the installed image receptor and Compression Paddle then auto matically adjusts the field size appropriately for application When in automatic mode field size can be reduced by pressing collimator override but ton rear blade only will move When the Collimator Mode is set to MANUAL detection circuitry only senses the size of the installed image receptor and automatically limits the field size appropriately All subsequent field size adjustments for the application are made using the Collimator Override Switch on the tubehead Default Setting Collimator Mode In either Collimator Mode the maximum field size is always limited to the size of the installed image receptor Using standard screening paddles regardless of mode selected only the rear blade moves when col limator override switch is pressed With any other available paddle when in manual mode the user can select any of the available field sizes 3 3 5 The unit incorporates three automatic exposure modes and one manual exposure mode This default setting should be set to the exposure mode most often used however all
194. ssor for normal operation S6 switch 4 OFF Chapter 3 System Setup IV Service Manual Chapter 4 Performance Compliance Checks and Adjustment Procedures 1 0 Introduction This section of the manual details the compliance checks and their adjustment procedures These checks include the X ray System performance checks the X ray and Light Field Compliance checks System Perfor mance checks and X ray Shield checks This section also provides the M IV error codes and messages that appear on the Run Mode Screen After servicing the X ray System the following checks must be completed Half Value Layer Check Reproducibility and Linearity Manual Mode Check Reproducibility Auto Time Mode Check Reproducibility Auto kV Mode Check Reproducibility Auto Filter Mode Check After servicing the components in the Tubehead the following X ray and Light Field checks and adjustments must be completed to ensure compliance X ray Beam Alignment Check and Adjustment Light Field Check and Adjustment Light Field Alignment Check and Adjustment Light Field Edge Contrast Check The following are standard System Performance Checks Bucky Device Linear Performance Check Bucky Device HTC Grid Performance Check Maximum mAs in Auto Time Mode System Level Functional Check The following checks verify that the M IV shielding meets requirements Perform these checks as required after servicing the Tubehead or the IR
195. stall the 18 x 24 cm Bucky and insert a loaded cassette For Linear HTC combina tion systems install the 18 x 24 cm Linear Bucky and insert a loaded cassette Note Use the same cassette for all cali Note All AEC Calibrations should be done Note Phantom material thickness 3 28 Note The 200 mrad window is most effec tive when the screen film speed is 170 or less It is generally not necessary to use the 200 mrad window when the screen film speed is greater than 170 Please consult your Medical Physicist regarding screen film combinations and the 200 mrad window for specific recommendations Set the unit for an Auto Time exposure at 24 kV Large focal spot MO filter Select one of the three available screen film types to cali brate Enter the setup screen and enter the name Kodak Fuji etc bration steps in the Auto Time Mode Place 2 cm of BR12 or 50 50 Breast Equiva lent Material B E M or acrylic also known as phantom material on the Bucky centered transversely extending approximately 1 cm over the chest wall edge requirements may vary depending on kV station being calibrated Place the AEC detector in the position clos est to the chest wall Take an exposure develop the film then measure the optical density OD Service Manual Note Always measure the Optical Den 10 11 12 sity with the lower edge of the film flush with th
196. static dis charge strap when handling static sensitive components 1 Disconnect the harness connectors from AHJ1 AHJ2 and AHJ3 on the board 2 Disconnect the 40 pin ribbon cable from AHJ4 on the board Lift the Filament Control Board off of the mounting standoffs 4 Reverse procedures to replace the Filament Control Board 5 Perform the following procedures before returning unit to service Chapter 3 Section 4 3 Tube Bias Adjustment Chapter 3 Section 4 4 Tube Current mA Adjustment Chapter 3 Section 5 0 Automatic Exposure Control Calibration all Chapter 4 Section 2 0 X ray System Performance all Chapter 4 Section 4 1 M IV Bucky Device Linear Performance Check if applicable Chapter 4 Section 4 2 M IV Bucky Device HTC Grid Performance Check if applicable Chapter 7 Section 5 2 Filament Con trol Board Over Current Over Voltage Adjustment Chapter 7 Gantry Maintenance Service Manual 2 4 Rotor Control Board WARNING To reduce the risk of hazardous electrical shock DO NOT attempt service until 5 minutes have elapsed after turning off the equipment CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components Always remove power before performing any removal or replacement procedure Access the Rotor Control Board by opening the l
197. switch receptacles J3 and J4 by aligning the key to the key hole and pushing the connectors straight in See Figure 2 5 Footswitch Connections Figure 2 5 Footswitch Connections Note Either footswitch can be connected to either footswitch receptacle 3 Replace the lower rear panel to the gantry using six cover screws 4 To disconnect the footswitch repeat steps 1 through 3 but instead of pushing the con nectors in Step 2 disconnect by pulling the connectors straight out 2 6 Chapter 2 System Installation M IV 2 4 Installation Radiation Shield The radiation shield and the shield support are shipped in separate containers and must be fastened to the Console Set the cable cover aside for mount ing after the cable connections are made to the remote console The two halves of the shield sup port are shipped already attached Separate the two halves by lifting the rear shield support slightly and then pulling it away from the front shield support Follow the instructions below to install the radiation shield to the M IV Operator Console Note The M IV Mobile unit does not come with an operator shield Shielding will be provided and installed by the M IV Mobile installer at time of system installation 1 Position the front shield support so that the mounting holes align with the threaded holes in the rear of the operator console 2 Secure the front shield support with the four bolts supplied 3
198. t tag out procedure at the source junction box before removing any covers 3 1 Compression Thickness Potenti ometer The Compression Thickness Potentiometer is a 5 000 ohm 10 turn potentiometer that mounts to the left side bulkhead of the Compression Device frame 1 Turn power OFF then remove the and bottom Compression Device covers as per Chapter 5 Section 2 3 Compression Device Covers Use care not to damage the Compression Device bellows Remove the lower bellows assembly as per Section 3 2 Upper and Lower Bellows Assemblies Steps 1 2 and 4 Loosen two allen screws securing the Com pression Timing Belt to the Bearing Block Assembly refer to Figure 8 10 Remove timing belt from the bottom clamp y S ME MENGES Me cx o oo oX Au 5 n n AB Compression Timing Belt Bottom Clamp cl Assembly Figure 8 10 Compression Timing Belt Removal 4 Gently thread timing belt up and out of the pulleys Check timing belt if damaged order new belt PN 3 230 4002 and replace as per Section 3 7 Timing Belt Chapter 8 C arm Assembly Maintenance 5 Service Manual Loosen the clamp screw A on the end of the potentiometer B shaft Remove the clamp and the sprocket C together refer to Figure 8 11 Remove the hex nut D that secures the potentiometer to the mounting bracket E Slide the potentiometer off the bracket Figure 8 11
199. t the mAs falls within the specified range If it does remove the cassette and develop the film Verify the absence of grid lines in the developed film Repeat steps 1 through 7 with the C arm rotated to 90 grid travel in the direction of gravitational pull Verify the absence of grid lines on the developed film for all expo sures Repeat the entire procedure for the 24 x 30 cm Bucky Device Repeat steps 1 through 7 with the C arm rotated to 90 grid travel against the direc tion of gravitational pull Verify the absence of grid lines on the developed film for all exposures Repeat the entire procedure for the 24 x 30 cm Bucky Device If grid lines are present on any exposure replace with a new Linear Bucky device and repeat this procedure M IV 4 2 M IV Bucky Device HTC Grid Performance Check Perform this performance check after servicing the M IV style HTC Bucky device or before utilization of a new HTC Bucky device This procedure requires the user to make exposures to check for grid patterns on the developed film and error codes Note Grid patterns are typically visible under the following conditions 1 Exposures in Left or Right MLO 2 Short exposures or incorrect threshold calibration Mount the 18 x 24 cm Bucky device on the IRSD Ensure the Bucky s electrical connection is made This procedure requires exposing and developing films It will be necessary to place attenuation between the tub
200. t the tube over voltage reading matches the value in Table 7 3 Make the proper potentiometer adjustment as required 7 20 Filament Control Board Over Current Over Voltage Adjust ment The following outlines maintenance procedures checks and adjustments for the Filament Control Board CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive components Turn power ON On the Filament Control Board connect a voltmeter to TP17 and TP7 Check that the small filament over current reading matches the value for the appropri ate tube Table 7 3 Make the proper poten tiometer adjustment as required Connect a voltmeter to TP16 and TP7 Check that the large filament over current reading matches the value for the appropri ate tube Table 7 3 Make the proper poten tiometer adjustment as required Connect a voltmeter to TP8 and TP7 Check that the filament over voltage reading matches the value for the appropriate tube Table 7 3 Make the proper potentiometer adjustment as required Chapter 7 Gantry Maintenance A M IV 5 3 Rotation Angle Calibration The following procedures require the use of a Digital Protractor Set the Rotation Display Potentiometer 1 11 Zero the Digital Protractor on the base of the M IV Holding the protractor against
201. table Service Manual Auto Filter Not Selectable default is Mo 25 26 kV Not Selectable Not Selectable 5 to 0 to 5 5 to 0 to 5 5 to 0 to 5 L1 Film Label 1 L1 Film Label 2 L1 Film Label Not Selectable Technique Mag Manual Filter 3 gt o Density Spot Film Auto kV Window Molybdenum Mo L Rhodium L1 20 35 kV Mo LI 28 39 kV Rh Table 1 8 mAs 125 mAs 17 steps L1 Table 2 3 mAs 150 mAs 41 steps L1 Film Label 1 L1 Film Label 2 L1 Film Label 3 Not Selectable Mag Auto Time L1 Molybdenum Mo Rhodium LJ 20 35 kV Mo 128 39 kV Rh Not Selectable L1 Film Label 1 L1 Film Label 2 L1 Film Label LARGE 1125 mAs 1165 mAs 1200 mAs Auto SMALL 0 38 mAs 1150 mAs 160 mAs Auto Mag Auto kV Molybdenum Mo L Rhodium 25 26 kV L1 28 kV Rh Not Selectable Not Selectable 5 to 0 to 5 5 to 0 to 5 Small Small Small L1 Film Label 1 L1 Film Label 2 L1 Film Label 3 Not Selectable L1 Film Label 1 L1 Film Label 2 L1 Film Label Not Selectable n these instances and when the system is operating with an HTC Bucky the kV is 25 kV only L1 Film Label 1 L1 Film Label 2 L1 Film Label SMALL 138 mAs 450 mAs 160 mAs Auto Large Large Large Large Small Small Small L1 Film La
202. tage Generator Assembly must be removed to access the left rotation display board The high voltage generator assembly is accessed by opening the left side Gantry door Remove and replace the left rotation display board as follows 1 Remove the High Voltage Generator Assem bly as per Section 2 1 of this chapter Disconnect the harness from the rear of the board Remove the mounting hardware 4 hex nuts that secure the board to the chassis then lift the Rotation Display Board out of the Gan try door Reverse procedures to replace the Rotation Display Boards Perform the following procedures before returning unit to service e Chapter 4 Section 4 4 System Level Functional Check Chapter 7 Gantry Maintenance M IV Service Manual 3 0 Gantry Frame Components Remove and Replace Before performing any remove and replace procedure ensure that all electrical safety precautions are met Power down the unit switch OFF the input power circuit breaker then disengage the voltage source Perform the applicable lock out tag out procedure at the source junction box before removing any covers WARNING Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic discharge strap when handling static sensitive components 3 1 VTA Motor Driver Board WARNING To reduce the risk of hazardous electrical shock DO NOT attempt service until 5 minutes have elapsed
203. te Sense ON or OFF Retain Patient Data for 1 Day 2 Days 3 Days 4 Days 5 Days Variable Speed Compression 1 Steps in range of 00 to 90 Density Step 6 8 10 and 12 5 3 10 Chapter 3 System Setup IV x Service Manual Table 3 8 Additional Setup Mode Default Worksheet Data Field Available Choices User Preference Somoresson Fore unis ms ATTACHED orOTATTAGHED _ 2120000 _ Date MM DD YYYY USA Format Time HH MM AM PM 12 Hour Format Adres UbtoG2Chmaes Tech ID field cleared wiGlearKey o ooo o o Auto ID Contrast Contrast Adjustment of Film Label 1 to 19 Auto ID Auto ID Offset Film Label Placement Adjust 0 to 7 EE Last character denotes Unit Number Chapter 3 System Setup 3 11 lt Table 3 9 Exposure Technique Default Worksheet Technique Filter ll j gt Density Spot Film Auto kV Window L1 Molybdenum Mo L Rhodium LI 20 35 kV Mo LI 28 39 kV Rh Table 1 83mAs 500mAs 23 steps L1 Table 2 8mAs 500mAs 59 steps Auto Time Molybdenum Mo L Rhodium L 20 35 kV Mo 128 39 kV Rh Not Selectable Auto kV i Molybdenum Mo L Rhodium L1 25 26 kV Mo L1 28 kV Rh Not Selec
204. ter 8 C qrm Assembly 8 3 IV Service Manual CAUTION Chassis DO NOT touch either filter on the dual fil ter assembly Filter contact with bare skin or other materials can cause artifacts in a developed film 6 Remove the hardware that secures the Beam 7 Limiting Assembly chassis to the tubehead RE i frame to remove the Upper Tier D ALI es SS 7 Reverse these steps to install the replace S ment Beam Limiting Assembly Ensure the X lt Lamp Harness Cable is securely routed through the cable clamp as shown in Figure 8 4 8 Perform the procedures below before releasing the unit to the user refer to Chap ter 4 e Section 3 1 X ray Beam Alignment Check and Adjustment e Section 3 2 Light Field Check and Adjustment e Section 3 3 Light Field Alignment Check and Adjustment Figure 8 4 Beam Limiting Assembly Removal e Section 3 4 Light Field Edge Contrast Check e Section 4 9 Check Light Field Edge Contrast e Section 5 2 X ray Tubehead Leakage Check 8 4 Chapter 8 C arm Assembly Maintenance 2 2 X ray Tube Service Manual Perform the following Checks and Adjust The x ray tube mounts to the tubehead frame Note that the Beam Limiting Assembly must be removed to access the x ray tube mounting hardware 1 Turn the unit OFF then remove the top and bottom tubehead covers Remove the Beam Limiting
205. the Compression Device completely down then back up Verify that the travel is smooth and that the chain does not bind When complete replace the lower Com pression Device cover Chapter 8 C arm Assembly Maintenance Service Manual ELEME lt Tr MELLE oD E m ED Ho d i Gat r AE Y D s V CL I T Y fd LN 5 Figure 8 21 Compression Chain Tension Adjust ment 8 2 M IV 6 4 10 11 8 22 Compression Thickness Potenti ometer Mechanical Adjustment Ensure the timing belt is mounted on upper clamp block Refer to Figure 8 17 Bring the compression device to the bottom of its travel With clamp screw Item A Figure 8 11 loosened rotate the potentiometer in a counterclockwise direction when viewed from the right side of the C Arm assembly until it bottoms out then make one full turn of the pot in a clockwise direction Thread the timing belt through the pulleys ensuring the potentiometer does not move and the timing belt does not twist While holding on to the bottom of the tim ing belt raise the compression device to the top of its travel Insert the timing belt through the lower clamp on the bearing block assembly refer to Figure 8 10 and tighten the screws enough to hold the belt in place Affix the Field Service Belt Adjustment Tool PN 9 061 0107 to the bottom of the timing belt and loosen the screws securing
206. the C arm frame Pull the compression motor and brake out of the C arm as an assembly Loosen the set screws that secure the motor shaft to the motor sprocket Pull the brake with the sprocket off the motor shaft Remove the screws that fasten the compres sion motor to the mounting bracket Mount the replacement motor onto the bracket Reverse these procedure to install the replacement compression drive motor and brake assembly Perform the procedures below before releasing the unit to the user e Chapter 7 Section 6 1 Compression Force Calibration e Chapter 7 Section 6 2 Compression Thickness Potentiometer Calibration e Chapter 7 Section 6 3 Compression Chain Tension Adjustment e Chapter 4 Section 5 2 X ray Tubehead Leakage Check Chapter 8 C arm Assembly Maintenance Service Manual Figure 8 16 Compression Drive Assembly 3 7 Removal Timing Belt Perform this procedure only if the compression tim ing belt has been damaged Figure 8 17 1 Loosen two screws securing the timing belt in the upper clamp block Remove belt and discard Insert the new timing belt through the upper clamp on the Tubehead Support Plate Apply Blue Loctite 242 and retighten SCrews Perform the Compression Display Potenti ometer Adjustment Refer to Section 6 4 Figure 8 17 Timing Belt Removal 8 13 M IV Service Manual 4 0 Remove and Replace IRSD Components Before performing any r
207. the belt in the bottom clamp see Figure 8 10 Tighten screws Install the 18 x 24 cm Bucky device and 18 x 24 cm paddle onto the compression device Center 1 cm of B E M or acrylic on the IRSD Move the compression device down until the paddle is touching the B E M or acrylic Rotate the potentiometer fully clockwise Attach an Ohmmeter between the red and white wire connections on the potentiome ter posts Rotate potentiometer shaft counterclock wise till Ohmmeter reads between 500 and 600 ohms Tighten clamp screw Service Manual 6 5 Setting Force Load Cell This procedure sets the Host Microprocessor for the installed compression force load cell This setting is factory configured Only change this setting after replacing the assembly 1 Remove the Compression Device cover to expose the compression force load cell Remove the load cell from the compression device Install the replacement load cell and note the name of the manufacturer Replace the Compression Device cover Set the M IV to the calibration mode S6 switch 4 ON Set the Host Microproces sor for the Force Load Cell selection mode 54 5 56 switch 8 ON Press Select S2 until the installed compres sion force load cell displays i e REV or LCC Set 54 5 S6 switch 8 to OFF then return the Host to normal operation S6 switch 4 OFF Perform the Compression Force Calibra tion and the Compression Thic
208. the gap between the armature and the clutch is 0 010 minimum to 0 020 max imum Verify that there is no left to right olay in the clutch Replace the covers and verify compression movement functions Perform the Compression Chain Tension Adjustment Section 6 3 the Compression Thickness Sensor Adjustment Section 6 2 and the Compression Force Adjustment Section 6 1 before releasing the unit to the user Chapter 8 C arm Assembly Maintenance 3 6 M IV Compression Motor and Motor Brake The Compression Motor drives the compression chain through a series of gears to move the Com pression Device up or down The Compression Motor Brake holds the chain in place to prevent Compression Device backlash Figure 8 16 1 Turn power OFF then remove the top and bottom Compression Device covers Remove the three screws that secure the top bellow to the C arm frame then carefully remove the top bellow Remove the lower tubehead enclosure then remove the Tubehead Microprocessor and the Tubehead Controller Board from the tubehead frame Manually move the Compression Device to center it on the C arm Disconnect the mas ter link on the drive chain then remove the drive chain from around the Compression Motor sprocket Disconnect the input power wires from the rear of the compression motor Note the polarity for replacement purposes Remove the two screws that secure the compression motor bracket to
209. the voltage source Perform the applicable lock out or tag out procedure at the source junction box before removing any covers 21 Generator Assembly Always remove power before performing any removal or replacement procedure The High Volt age Generator Assembly panel consists of four cir cuit boards e the High Voltage Transformer e the High Voltage Multiplier e the High Voltage Inverter e the High Voltage Control Note In order to retain Compliance the High Voltage Generator Assembly must be removed as a single unit WARNING To reduce the risk of hazardous electrical shock DO NOT attempt service until LED D14 is unlit and at least 5 minutes have elapsed after turning off the equipment 1 Access the High Voltage Generator Assem bly panel by opening the left side Gantry door as per Chapter 5 Section 2 2 Step 1 2 Disconnect high voltage cable from high voltage test well near the top Refer to Fig ure 7 3 3 Remove ground wire 1 Loosen the two upper screws holding the assembly to the gantry 5 Cut all cable ties that secure the wiring har ness 6 Remove the bottom screw on the safety shield and loosen the top one enabling you to move the shield out of the way Chapter 7 Gantry Maintenance Figure 7 3 WARNING LED D14 must be OFF and five minutes must have elapsed since removing power to the equipment before continuing Removal High Voltage Generator Assembly 7 3 Servi
210. this plot across the semilog until it inter sects with the line plotted in step 7 Draw a vertical line through the intersection to the bottom of the semi log This is the half value layer Verify that the half value layer is equal to or greater than 0 33 mm AL and less than 0 42 mm Al Select the Rhodium Rh filter then repeat steps 4 through 9 to obtain the half value layer for the Rhodium filter Verify that the half value layer is equal to or greater than 0 33 mm Al and less than 0 49 mm Al Service Manual Chapter 4 Performance Compliance Checks and Adjustment Procedures 4 3 4 4 Service Manual HIS EH EHIH EH HHI EHIH EE 3 ELE EENSESEESEEFESSEHSSEESSEESEERSHE 9999 9911 H TT HR Ea mi BCL ELEC EGR EEE EEL EEC PUES RR i uu iu uL 3 EEEE EE E LLELTELELEEEEEEL ELTE EET EE EE ELE EL EE EE EEE ELE LE EEEESEEESEEESSHSESEERSHE 9999 999999991 EH EH a HHH FR EH E HH
211. through 10 Check the orientation of the ribbon cable then remove the ribbon cable Item 1 Fig ure 6 7 and the power cable from the con nector Item 2 Figure 6 7 on the rear of the floppy disk drive Item 7 Figure 6 7 Remove the hardware Item 3 Figure 6 7 that secures the floppy disk drive and drive mount Item 5 Figure 6 7 to the Console frame Pull the floppy disk drive assembly inward until the drive faceplate clears the Console frame then lift the assembly out of the Con sole Remove the hardware Item 4 Figure 6 7 that secures the floppy disk drive to the mount Secure the replacement floppy disk drive onto the mount then slide the disk drive into the drive slot Item 6 Figure 6 7 in the Console Adjust the floppy disk drive position so that the faceplate is flush with the Console frame then tighten the mounting hardware Replace the ribbon data cable and the power cable Replace the Operator Console Control Panel by reversing the procedures in Section 5 2 1 Steps 6 through 10 Apply power and verify that the floppy disk drive indicator lamp illuminates for approxi mately 3 seconds during the boot up pro cess indicating drive recognition Chapter 6 Operator Console Maintenance Service Manual Legend for Figure 6 7 Ribbon Data Cable Power Cable Connector Hardware secures floppy disk drive and drive mount to console frame Hardware secures floppy disk drive to drive mount
212. tient information and exposure factors the optional printer must be installed and the Printer data field in the Setup Mode must be set ON Default Setting Printer The user selectable choices for the Printer data field are ON or OFF 3 3 10 Default Setting Auto ID The system is equipped with the AutoFilm ID which places a photographic label of exposure techniques and identification data on the film The AutoFilm ID requires the use of DIN style cassettes with the built in sliding window The user selectable choices for the Auto ID data field are Tube Side black on white Tube Side white on black Emulsion Side black on white Emulsion Side white on black OFF Default Setting Cassette Sense 3 3 11 The Cassette Sense Interlock works with the M IV style Bucky Device or the Magnification Table only This data field permits the user to choose the Cas sette Sense Interlock status as ON or OFF When the interlock is ON the M IV prevents an exposure when a cassette is not inserted into the Bucky device or when the cassette has not been ejected and then replaced after an exposure When the interlock is OFF exposures are not inhibited 3 3 12 This data field permits the user to choose the length of time the M IV will store pre scheduled informa tion on the dynamic RAM located on the Remote Console Microprocessor Board The choices for this data field are 1 2 3 4 or 5 Days Default Setting Retain Patie
213. tion Small Spot RH Fil 33 kV 35 kV Small Focus ter 1 Input the values for MASTER DENSITY GAIN and OFFSET used at 25 kV for each corresponding value for 20 kV 24 kV Note While there are currently no requirements for Rh using Small Focal 2 Input the values for MASTER DENSITY Spot some physicists may require cali GAIN and OFFSET used at 32 kV for each bration be done on any user selectable corresponding value for 33 kV and above kV Filter combination therefore Rh 3 When complete return all switches to their Small Focal Spot calibration may be defaults and return unit to normal opera required tions Run Mode 1 Repeat Section 5 2 4 using Rhodium Rh filter at 28 kV 32 kV Ensure S4 is set to E S6 switch 4 ON and S6 switch 8 ON 2 Enter the values from the Small Focal Spot Performance chart as the starting values for Rhodium filter calibration 3 Record the values on the Performance Test Worksheet Table 3 19 4 When complete return all switches to their defaults and return unit to normal opera tions Run Mode Table 3 19 Performance Test Worksheet Small Focal Spot Rh For these kV values 3 cm or greater may be required Chapter 3 System Setup 3 3 1 M IV 5 3 5 3 1 5 4 3 32 Preparation for Compression Thickness Threshold Adjustment Verify the Optical Density Offset Factor is set at HaecF85 if not adjust to 85 Turn S4 to posi
214. tion 1 S6 switch 8 ON as per the previous procedure 3 Set the Host Microprocessor for the Tube Bias adjustment S4 to position 4 S6 switch 8 OFF 4 Obtain the Tube Bias value voltage for Varian resistance for Toshiba from the manufacturers documentation for both focal spots 5 Select the Large focal spot then increase S5 or decrease S3 the displayed value according to the chart below 6 Select the Small focal spot then increase S5 or decrease S3 the displayed value according to the chart below 7 When the appropriate Tube Bias is set press Save S1 then set the system to normal operation S6 switch 4 OFF 3 2 VARIAN M IV Table 3 13 Tube Bias Voltage TOSHIBA TOSHIBA BOTH SPOTS SMALL SPOT LARGE SPOT 4 4 Tube Current mA Adjustment The unit selects and regulates x ray tube current as a function of kV Check the x ray tube current by mea suring the voltage at TP4 mA Sense and TP17 DGND on the High Voltage Control board Item 5 Figure 7 1 The High Voltage Control board test points are identified in Chapter 7 Table 7 2 3 22 WARNING Observe all safety precautions while mak ing an X ray exposure Turn the unit OFF then open the left and right side Gantry doors On the Host Micro processor set the unit for the Calibration mode S6 switch 4 ON Check that the Host is set appropriately for the installed x ray
215. tion 2 on the Host Board and set 56 switch 8 to ON Using S3 55 change the displayed value to 4 cm Reduced mA OD Offset Factor Initial Adjustment Adjust the rotary switch on the Host Board to position E Press S2 until the Host display reads HaecF Using switch 53 on the Host adjust the dis play to read HaecF85 Turn S6 switch 8 OFF Reduced Large Spot mA Cali bration Return to Section 5 3 step 8 and program your calculated threshold Install the HTC Bucky Device on the IRSD Set the unit for a Manual mode exposure at 25 kV 12 mAs Return Host to Fil Cal Host Display should read HTC xxxx Connect Channel 1 of a storage oscillo scope to TP4 mA sense on the High Volt age Control Board Connect the probe ground to TP17 GND on the High Voltage Control Board Using the same sequence as the Tube Cur rent Adjustment mA check each kV sta tion for under or overshoot If adjustment is necessary set the Host Microprocessor for Filament Calibration 4 at position 2 Press S5 to increase for undershoot or press 53 to decrease for overshoot the displayed value Continue making exposures and adjust ments as needed until the waveform at each kV station is stable and at the correct ampli tude Service Manual 5 5 Compression Thickness Thresh old Adjustment Place 3 cm of B E M or P M M A acrylic on the Bucky centered laterally and extending 1 cm over the chest wall
216. tomatic beam collimator The lower tier must be removed before the upper tier The proce dure below explains how to remove the Beam Limit ing Assembly Beam Limiting Assembly 1 Turn the unit OFF then remove the top and bottom tubehead covers 2 Disconnect the Lamp Cooling Fan power cable from the Filament Protection Board 3 Disconnect the cables listed in Table 8 1 from the Tubehead Controller Board 4 Remove the hardware that secures the lower tier collimator blades to the Beam Limiting Assembly chassis Carefully remove the col limator assembly and set it aside Use care not to damage the lead lining on the colli mator blades 5 Remove the hardware that secures the upper tier mirror and filter assemblies to the Beam Limiting Assembly chassis Care fully remove the mirror and filter assembly and set it aside Note It is possible to install cables DJ1 DJ2 DJ3 and DJ4 incorrectly To avoid this note the cable position and orien tation before disconnecting Table 8 1 Tubehead Controller Board Cables CABLE DESCRIPTION eft Collimator Blade Position Detect L Left Collimator Blade Motor Filter Assembly Motor Filter Assembly Position Detect irror Lamp Assembly Position Detect M Mirror Lamp Assembly Motor Rear Collimator Blade Position Detect DJ10 Rear Collimator Blade Assembly Position Detect R DJ11 ight Assembly Position Detect DJ12 ight Assembly Position Detect Chap
217. tons to initiate an exposure During the exposure step on the C arm Up footswitch Verify that C arm up movement is prevented during the expo sure Continue to hold the footswitch button down until the exposure stops Verify that the Run screen message shows Motion Error 66 and that C arm up movement is still prevented Release the footswitch then press any of the C arm motion switches up down rotation etc Verify that movement is still pre vented Press the RESET button and verify that the error message is cleared and that all C arm motion buttons are active Repeat this check using the C arm Down footswitch Chapter 7 Gantry Maintenance IV Service Manual Chapter 8 C arm Assembly Maintenance 1 0 Parts Identification The following paragraphs detail the components within the M IV C arm Assembly as shown in Figure 8 1 Tubehead Components Figure 8 2 Beam Limiting Assembly and Figure 8 3 C arm Components Legend for Figure 8 1 X ray Tube Tubehead Switch Board 2 Filament Protection Board Tubehead Cooling Fan Beam Limiting Assembly Tubehead Motor Driver Board Tubehead Microprocessor Board N Oo BW NH Figure 8 1 Tubehead Components Chapter 8 C arm Assembly Maintenance 8 M IV Legend for Figure 8 2 Collimator Blades 4 Collimator Drive Motors 4 Collimator Lamp Assembly Mirror Assembly Lamp Mirror Drive Motor Dual Filter Motor Filter Drive Motor B
218. tract each actual reading from the aver age Square each difference Add the squares and divide their sum by 9 Take the square root of the result Divide the number obtained in Step 3 by the average milliroentgen reading The quo tient called the coefficient of variation must be less than 0 05 Note To calculate the coefficient of vari ation use the Reproducibility Work sheet Table 4 2 which sequences the steps to manually calculate the quo tient The worksheet also provides the formula for calculating the quotient using a statistical calculator Note that the mAs value is not set for this check Chapter 4 Performance Compliance Checks and Adjustment Service Manual 2 4 Reproducibility Auto kV Mode Check The following test verifies that the automatic expo sure control system is reproducible in the Auto kV exposure mode Failure to meet this performance test indicates the need to check the calibration of the Automatic Exposure Control System WARNING Observe all safety precautions while mak ing an X ray exposure 1 Mount a cassette holder with an empty cas sette onto the IRSD Place a 6 cm acrylic phantom on the cassette Position a radia tion probe 10 square cm on top of the phantom Align the probe position with the AEC sensor at front center on the IRSD Use the light field and collimate the x ray field to the approximate size of the probe 2 Set the unit for an Auto kV ex
219. tube S4 to position 1 S6 switch 8 ON Connect a voltmeter across R74 on the Fila ment Control board primary filament cur rent Item 7 Figure 7 1 The Filament Control board test points are identified in Chapter 7 Table 7 4 Connect Channel 1 of a storage oscilloscope to TP4 on the High Voltage Control board Connect the probe ground to TP17 on the High Voltage Control board Locate the two position banana jack Item 1 Figure 3 6 on the High Voltage Multi plier Board for board location refer to Chapter 7 Figure 7 1 Remove the jumper bar and plug in an mAs meter CAUTION NEVER operate the system without either the jumper or the mA meter installed into the mA mAs meter banana jack Apply power to the unit and perform the power up sequence Record the voltage reading on the meter connected across R74 Multiply the voltage reading by 10 and ver ify that the product is 2 45 to 2 55 indicat ing the standby current Disconnect the meter across R74 on the Filament Board Check Filament over current and over volt age levels as per Chapter 7 Section 4 3 Set the mAs Mode to MODE 2 59 mAs lev els Set the unit for a Manual mode expo sure at 25 kV Large focal spot 100 mAs then make an exposure Verify that the mAs reading on the meter is between 96 and 104 mAs 5 mAs If not adjust R20 on High Voltage Control board for 100 mAs as required Set the oscilloscope to acquire and stor
220. ures 1 Rotate the C arm to 0 Set the unit for an Auto Time 25 kV exposure Large spot Normal density Select the Film Type being used 2 Place a loaded cassette in the Bucky device then place 2 cm of B E M or acrylic on the Bucky Device Hold the attenuation in place with the Compression Device 3 Verify a low mAs reading is obtained nomi nally between 12 and 20 mAs dependent on film speed If the mAs reading is above or below the specified range add attenua tion to increase mAs or remove attenuation to decrease mAs 4 Reload the Bucky using the same cassette and film type and repeat the exposure Verify that the mAs falls within the specified range If it does remove the cassette and develop the film Verify the absence of grid lines in the developed film Chapter 4 Performance Compliance Checks and Adjustment Procedures 10 Place 5 cm of B E M or P M M A acrylic on the Bucky and hold it in place with the paddle Reload the same cassette with the same film type then load it into the same Bucky Make an exposure using the technique fac tors from step 1 Verify a high mAs read ing is obtained nominally between 250 and 350 mAs dependent on film speed If the mAs reading is above or below the specified range add attenuation to increase mAs or remove attenuation to decrease mAs Reload the Bucky using the same cassette and film type and repeat the exposure Verify tha
221. utomatic Exposure Control Calibration These procedures detail the steps necessary to calibrate the M IV Automatic Exposure Control AEC System Calibration of the AEC is performed at the factory to assure that the system is capable of proper calibration and performance in the field At installation the AEC must be adjusted to obtain films of the proper mean optical density typically 1 3 OD optical density to 1 6 OD depending on the radiologist s preference using the site s processing equipment AEC system performance is specified at the kV stations which are normally used clinically Table 3 14 Typi cal kV range vs compressed thickness presents a guideline for typical clinical values for breast composition and thickness Table 3 14 Typical kV range vs compressed thickness THICKNESS FATTY 50 50 DENSE 2cm 23 4kV 24 25kV 25 26kV 4 cm 25 26kV 26227kV 27 28kV 6 cm 26 27kV 27 28kV 29 30kV Note 2 cm thickness imaging is not appropriate above 26 kV while 6 cm thickness imaging is not appropriate below 26 kV ALWAYS perform this calibration and setup procedure in the sequence presented to ensure accurate calibra tion Section 4 0 the Exposure System Calibration Procedures must be performed prior to starting AEC Calibra tion Table 3 15 AEC Calibration Procedures provides a Flow Chart of the order in which the AEC Calibration procedures must be performed on systems with Linear Grids only both Linear and
222. ve motor and brake controls and the compression force and thickness indicators To complete this check install a compression acces sory then place 4 cm of B E M on the IRSD 1 Press and hold a COMPRESSION DOWN button Item 9 Figure 3 2 and verify the following e Compression Device moves downward e Compression Thickness Display decreases e Collimator lamp illuminates for 30 sec onds e Compression Force display increase upon compression of B E M e Compression Device stops upon releas ing key e Compression clutch brake engages Press and hold a COMPRESSION UP button Item 8 Figure 3 2 and verify the following e Compression Device moves upward e Compression Thickness Display Increases e Compression Force display decreases e Compression Device stops upon releas ing key Note Repeat steps 1 and 2 using the 3 6 attached Footswitches Press and release a COMPRESSION RELEASE button Item 7 Figure 3 2 and verify the following e Compression clutch brake disengages e Compression Device moves upward e Compression Thickness Display Increases e Compression Force display decreases e Compression Device stops automati cally Service Manual 2 2 Functional Checks C arm Movement System The following steps check for proper function of the C arm movement motors and brakes and the opera tion of the C arm rotation indicators 1 Press and hold a C arm UP button Item 5 Figure 3 2 and v
223. verify the following and verify the following e Collimator Lamp illuminates Collimator Lamp automatically turns off after approximately 30 seconds e 4 blade collimator device moves to another field size TUBEHEAD CONTROLS 1 Collimator Override 2 C arm Rotation CW 3 C arm Rotation CCW 4 Light Field 5 C arm Up 6 C arm Down 7 Compression Release 8 Compression Up 9 Compression Down Figure 3 2 C arm Controls Chapter 3 System Setup 3 7 3 0 Setting System Defaults Service Manual The user can select system default settings for many system functions by entering the Setup Mode The Changes made in the Setup Mode will define how the system is set each time power is turned on This sec tion of the manual describes how to set system functions and exposure parameters To enter the Setup Mode from the Run Mode press the Run Setup key The M IV Run Mode and Setup screens are shown in Figure 3 3 The locations of the Console keys are shown in Figure 3 4 ANYTOWN HOSPITAL ID Name Birth Date Sex Compression DUAL Comment Tech ID CPT Code Exam View 01 07 1996 2 43 p m OFF Date Time Printer Auto ID Tube black on white Comp Release MANUAL 18x24 HTC Grid AUTOMATIC OFF Receptor Collimator View Reminder proceed to the next field Enter the Patient Identification An alpha numeric patient ID MUST be entered before continuing
224. vice Manual 45 AEC Detect Board The AEC Detect Board Assembly is mounted beneath the breast tray on the IRSD Figure 8 20 Access this board by removing the IRSD bottom cover CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic dis charge strap when handling static sensitive componen s 1 Turn power OFF Remove the bottom IRSD Figure 8 20 AEC Detect Board Removal cover and the front rail of the breast tray 2 Remove the ribbon cable from FJ5 on the Microprocessor Board 3 Slide the entire AEC Detect Assembly out from the front of the IRSD 4 Reverse these steps to install the replace ment AEC Detect Board Assembly 5 Perform the Image Receptor Leakage Test Chapter 4 Section 5 1 IRSD Leakage Check 6 Perform the following procedures before returning unit to service e Chapter 3 Section 5 0 Automatic Exposure Control Calibration e Chapter 4 Section 2 3 Reproducibility Auto Time Mode Check e Chapter 4 Section 2 4 Reproducibility Auto kV Mode Check 8 16 Chapter 8 C arm Assembly Maintenance IV Service Manual 5 0 Test Points Use the following test point tables as a guide for troubleshooting the circuit boards the M IV Assem bly CAUTION Be aware of the damage static electricity can inflict on electronic components Always wear a grounded electrostatic discharge strap when ha
225. w is most effec tive when the screen film speed is 170 or less It is generally not necessary to use the 200 mrad window when the screen film speed is greater than 170 Please consult your Medical Physicist regarding screen film combinations and the 200 mrad window for specific recommendations Chapter 3 System Setup M IV Use this data field to type in the name of the second screen film combination to appear as a choice in the Film Type data field in the Run Mode Film fields must be backspaced to clear old screen film infor mation 3 4 5 Use this data field to type in the name of the third screen film combination to appear as a choice in the Film Type data field in the Run Mode Film fields must be backspaced to clear old screen film infor mation 3 4 6 Use this data field to type in the length of time that the AutoFilm ID flashes for film type 1 The value entered here represents time in milliseconds This data field holds up to four digits and must be in the range of 1 to 9999 500 is the default To enter a flash time perform the following Highlight the Flash Time 1 data field 2 Flash Time fields must backspaced to clear old screen film information Type the desired value 1 to 9999 for film type 1 then press Enter to record the value Setting Flash Time 2 Setting Film 2 Setting Film 3 Setting Flash Time 1 3 4 7 Use this data field to type in the length of time that the AutoFil
226. wear a grounded electrostatic dis charge strap when handling static sensitive charge strap when handling static sensitive components components 1 Disconnect the harness connectors from 1 Disconnect the harness connectors from KJ2 KJ3 KJ7 KJ8 KJ9 and KJ12 on the CJ7 CJ8 CJ10 CJ14 15 CJ16 board 17 CJ20 CJ21 CJ22 CJ23 CJ24 CJ25 2 Disconnect the RJA5 jacks from KJ18 KJ19 C 26 CJ27 and CJ29 on the board KJ20 KJ21 KJ22 KJ23 KJ24 and KJ25 on 2 For units with StereoLoc II disconnect CJ12 the board 3 Disconnect the 45 jacks from CJ1 CJ2 3 Liftthe Host Microprocessor Board off of CJ3 and CJ5 on the board the mounting standoffs 4 Liftthe Motor Lamp Control Board off of 4 Reverse procedures to replace the Host the mounting standoffs Microprocessor Board 5 Reverse procedures to replace the Motor 5 Perform the following procedures before Lamp Control Board returning unit to service 6 Perform the following procedures before e Chapter 3 Section 4 0 Exposure Sys returning unit to service tem Calibration all e Chapter 3 Section 2 0 Functional e Chapter 3 Section 5 0 Automatic Checks Mechanical all Exposure Control Calibration all e Chapter 3 Section 7 3 C arm Rotation e Chapter 3 Section 7 0 Final Set Up Speed Check Checks e Chapter 7 Section 5 4 C Arm Switch Chapter 4 Section 2 0 X ray System Interlocks Verification Performance all e Chapter 4

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