UltraTec PFM1s2 Service Manual Issue 3
Contents
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4. connecting the lid to the base and carefully disconnecting the keyboard and display interface cables Ultrasound Technologies Ltd Issue 3 December 2001 Page 11 Ultrasound Technologies Ltd Access to the bottom of the Main Board can be achieved removing all the screws and RS232 lock nuts Disconnect all cables before removing the boards The Keyboard and display module can be removed from the lid by careful removal of the 4 nuts holding the parts in place Be careful not to loose the spacers lying behind these cards Ultrasound Technologies Ltd Circuit Description Power supply Circuit The 240 110 VAC supply enters the PFMI via an IEC double fused inlet mains filter and switch and is fed to a torroidal transformer The input supply voltage is stepped down to a nominal 24 VAC and is then bridge rectified by D19 smoothed by C140 Regulated Supplies The voltage regulators U28 and 029 are fed from D19 at a voltage of around 36VDC These oscillate at approximately 120 KHz transferring pulses of current into L12 and L14 respectively The output of inductor is fed back directly into U28 29 which at pin 1 is reference comparator and alters the pulses transferred into the inductor to obtain a stable voltage output The output of 028 is 5V DC 029 is 12V DC Pulses of current in to inductor L14 are also taken into a charge pump to pr
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14. Ultrasound Technologies Ltd U12 U25 U1 2 4 5 6 26 32 U27 U3 7 24 U10 09 D20 21 22 23 D1 2 6 7 9 10 14 15 17 18 24 25 D3 11 D4 5 8 12 13 16 26 D27 28 D19 Q13 Q1 5 6 10 11 12 Q14 Q2 3 4 7 8 9 X2 3 R95 96 117 118 R2 6 40 44 133 158 R14 52 100 132 R1 9 32 36 39 47 70 74108 110 122 152 R141 R18 56 165 813 17 37 51 55 75 120 121 130 148 149 179 R79 82 125 R8 46 R11 19 49 57 140 143 R135 138 139 R180 181 R34 72 144 150 151 154 155 R5 20 21 22 23 24 35 38 43 58 59 60 61 62 73 76 78 81 83 85 86 87 88 89 90 91 92 93 94 97 99 101 104 106 111 112 114 115 116 123 126 131 142 153 160 161 162 167 168 172 173 174 176 178 R119 R98 128 R84 R27 65 137 156 157 R7 45 77 80 127 R25 63 R30 68 124 R12 16 28 50 54 66 83 4 10 15 29 33 41 42 48 53 67 71 109 134 136 170 171 R26 64 R163 177 Ultrasound Technologies Ltd Issue 3 December 2001 Page 19 O NNNNA V N E m WN FD AR c m N N Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 296 sm 0805 Variable R Multiturn Variable R Multiturn Inductor Inductor Inductor Inductor Inductor Inductor Connector Connector Connector Connector Connector Connector Connector 330K 680K 1M 10M 2 0 Bourns 3224W 5KO Bourns 3224W 22uF Panasonic ELC 100uH Torroid Toco 215PN0838X Toco 215PN0842Z Toco 215PNA0841HF Toco 215PN0876N Mole
15. Value 10000uF Electrolytic 35V Panasonic TSUP snap in 1000uF Electrolytic 35V Panasonic EEUFC1V102 270uF Electrolytic 16V Panasonic FC 220uF Electrolytic 35V BCC 136 60221 120uF Electrolytic 50V Panasonic EEUFC1H121 100uF Electrolytic 16V ssm 16V 22uF 100V Panasonic EEUFC2A220 1uF Ceramic Z5U 1206 100nF Ceramic X7R 0805 47nF Ceramic X7R 0805 33nF Ceramic X7R 0805 10nF Ceramic X7R 0805 4n7F Ceramic X7R 0805 3n3F Ceramic X7R 0805 1nF Ceramic COG 0805 680pF Ceramic COG 0805 470pF Ceramic COG 0805 220pF Ceramic COG 0805 100pF Ceramic COG 0805 47pF Ceramic COG 0805 22pF Ceramic COG 0805 10uF Tantalum 20V Case size B 1uF Tantalum 35V Case size A 0u47F Tantalum 25V Case size A CD74HCT04D CD74HCT541E MC68HC812A4 AM27C256 150JC HM62256 uPD43256BGU 70LL NJM3777E3 PBL3777so NJU39612E2 96250 LT1076CQ LM338T DS1305E MAX202E MAX549ACUA MAX1243BESA Ref C130 C134 C142 148 C96 108 133 138 C131 136 C22 30 38 65 73 81 99 119 156 C143 146 151 C37 80 160 162 C1 2 6 10 11 13 14 19 20 21 23 24 27 28 32 33 40 41 44 45 49 53 54 56 57 63 64 66 67 70 71 75 76 83 84 87 90 91 93 94 97 98 100 104 105 106 107 109 110 111 113 114 115 116 117 120 121 122 123 125 1 27 128 129 132 135 141 145 149 150 154 155 157 158 15 9 161 163 164 C43 86 C88 C9 18 29 34 35 36 39 52 61 72 77 78 79 82 137 140 C112 C89 C4 8 17 26 42 47 60 62 69 85 124 C7 15 50 58 C48 C3 16 46 51 55 59 C5 C12 C10
16. on off switch which is located on the rear of the unit as part of the AC line input socket When the unit is on the front panel LED N will be illuminated The starts and then enters its User Configuration Mode release the Toco Zero button as soon as Calibrate System is displayed You are then prompted to enter the date if different to that displayed To change the day and month press the Volume Up button One press advances the day by one pressing the Volume Up button for longer advances the day by 10 To change the year press the Volume Down button One press advances the year by one pressing the Volume Down button for longer advances the year by 10 When the correct date is displayed press the Toco Zero button once You are then prompted to enter the time if different to that displayed This works in a similar manner to the date with the Volume Up button advancing the hours and the Volume Down button advancing the minutes When the correct time is displayed press the Toco Zero button once You are then prompted to enter the Toco Base Line offset This sets an artificial zero line for the toco transducer above zero it can be set by pressing the Volume Up or Volume Down buttons for a value between 0 20 After setting this value the Toco will be set to this every time the Toco Zero switch is pressed and allows small negative Toco excursions to be seen on the chart When the correct time is displayed press the Toco
17. reset on the CPU high logic 1 to 5 v This starts the CPU working by reading the bytes at the very top of its memory map from the EPROM ROM This shows the CPU the start position in ROM from which to start executing This sets up all the peripheral devices which includes an interrupt timer starts the system clock which consists of interrupts from the cpu to the watchdog ic at the rate of 1 every millisecond As all functions are time dependant nothing starts without this clock The CPU now reads all the preset variables from the battery protected RAM within the real time clock The battery source is a lithium 3 6 v cell with a nominal life of 10 years After the CPU has loaded the variables it rums a system check for any internal problems which are reported on the system display Selection of the individual devices is controlled by cpu internal the chip select circuits Most analogue signals eventually require digital signal processing for display chart recording or digital transmission the signals are presented to CPU where an internal 8 bit A D converter with an 8 way multiplexed input converts the signals to digital form The converter accepts unipolar signals of 0 5 v The CPU with the display and keyboard circuit using on chip peripheral interface as well as detecting selection of ultrasound and the presence of an Event keypress Printer Interface A proportion of the micro circuit is dedicated to printer interface and control
18. the primary interface circuit contains timers serial drivers and peripheral drivers The principal of operation of the printhead and motor drive circuit is as follows Data is decoded by the software into bit positions within the allowable area of the printhead This data is then passed in serial form with a clock signal into the printheads serial buffer The data is latched by a pulse from the cpu via CMOS buffer this gives added protection in the case of device failure Data is then burnt onto the printhead by strobes 1 to 4 from the cpu which last less than 1 mS Under normal conditions with the printer OFF there is no supply connected to the printhead or chart motor Only when printing is requested does the cpu turn on the 24VDC supply The cpu also drives the chart recorder stepper motor via the high current microstep interface Ultrasound Technologies Ltd Issue 3 December 2001 Page 15 Ultrasound Technologies Ltd Test Procedures Introduction The following sections details tests to ensure that the is operating within specification These tests may be performed in whole or part however if any repairs are carried out to the power supply circuits then it is recommended that the whole test calibration procedure is undertaken The test procedures may be performed without removal of the circuit board from the unit Performance Checks The following procedure is intended to provide a means of determining the functional status of
19. the unit It should be included as part of a preventive maintenance plan and should be performed on a regular basis 1 Plug the monitor line cord into grounded receptacle of suitable line voltage and frequency as indicated on the rear panel of the PFMI 2 Turn monitor on The green front panel LED will illuminate 3 The display will first show the system selftest followed by the software revision This indicates the instrument is switched on and awaiting inputs 4 Load chart paper to recorder for assistance see operating instructions ensure paper is correctly aligned 5 Depress printer on off and recorder will run at either 1 2 or 3 cm min dependent on the user preset value Ultrasound 6 Connect ultrasound transducer to the yellow or blue US sockets on the front panel and increase volume to maximum 7 Place transducer in palm of hand and gently stroke the back of the hand at a constant rate of about 2 times a second 8 Check audio volume is present digital display will display the simulated rate approx 120 and correspond with the data being printed on the chart paper UA Toco Contractions 9 Connect the toco transducer to the grey UA input socket on the front panel and press UA zero to set the baseline baseline resets to value 1 gt 20 as selected in set up procedure 10 Apply pressure onto the centre of transducer and check that the toco trace on chart recording increases to 100 10 Remove load and trace
20. 1 Signal Pre processing The detected audio complex is fed to U5 a bandpass amplifier where the filter characteristics are arranged to reject signals below 150Hz and above 1KHz and the output is taken do a digital AGC U3 The amplitude stabilised signal is then amplified and full wave rectified by U2 This full wave rectified signal is then buffered and smoothed by an active filter The smoothing is achieved by the low pass active filter having a 3db at 5Hz hence giving the average value of the audio complex This signal is then passed to the A D converter stage of the cpu U8 for further digital signal processing Toco Circuit A stabilised 5V is fed to the toco transducer along with OV which form the excitation of a Whetstone bridge in the transducer The Differential output of the transducer is fed via a high gain differential amplifier U26 to a low pass filter U32 for signal smoothing into the A D converter U11 further digital signal processing U8 Toco Zero is automatically adjusted by D A converter U31 providing an offset voltage into the input of U32 Overall gain is adjusted by VR2 Ultrasound Technologies Ltd Issue 3 December 2001 Page 14 Ultrasound Technologies Ltd Microprocessor Circuit The microprocessor circuit is arranged around MC68HC812 a fast second generation central processing unit CPU When power is applied to the circuit a monitor circuit waits for the power rail to become stable and then 100 ms later takes the
21. 1 102 C153 C118 126 139 144 C25 31 68 74 U15 016 U8 09 022 020 023 028 29 030 U13 U14 U31 U11 Ultrasound Technologies Ltd Issue 3 December 2001 Page 18 Quantity nm 77 Dv BR b pp ae IC Analogue sm IC Analogue sm IC Analogue sm IC Analogue IC Analogue sm IC Analogue sm IC Socket sm Diodes sm Diodes sm Diodes sm Diodes sm Diodes sm Diodes Bridge Transistor Transistor sm Transistor sm Transistor sm Crystal Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 Resistors 196 sm 0805 ZM33064G DG211DY LM324M TDA2614 X9C103S LM336M 2 5 PROM 32way plcc IR10BQ040 BAS16 BAT54 BZX84 C5V1 BZX84 C6V2 GBU4A RFD8P05SM BC848B FZT949 MMBF4416LT1 32KHz 85SMX 1R 10R 22R 100R 120R 470R 1KO 1K2 1K5 2 2 2 7 3K3 4K7 10K 12K 15K 16K 22K 27K 36K 47K 68K 100K 180K 220K
22. Protection against electrical shock in the event of failure of basic insulation is provided by the connection of the chassis to the safety ground Safety grounding occurs only when the 3 wire cable and plug provided with the system are connected to a properly grounded receptacle Do not remove the System cover The System should be serviced by trained and qualified personnel only Contacting the hazardous voltages within the System could cause serious injury Do not use the System if the power cord has any cuts or openings Ultrasound Technologies Ltd Issue 3 December 2001 Page 6 Ultrasound Technologies Ltd Do not use the transducer if the cable has any cuts or openings Do not use the transducer if the transducer face is cracked or chipped Do not immerse the transducer cable connectors in any liquids Electrical shock could result Should the electrical safety fuses have to be replaced use only fuses of the same type and rating Explosion Hazard Do not operate or use this system in the presence of flammable anaesthetics or gases as it could lead to explosion Handling the Delicate Transducers The transducers are delicate parts of the ultrasound system and should be treated with care The delicate crystals in the transducer may crack and render the transducer unusable if the transducer is subject to shock Room temperature liquids should be used for cleaning Never use alcohol or mineral oil as an acoustic coupling agent as
23. Ultrasound Technologies Ltd 1 8 and 2 1 MHz continuous wave Multi element wide angle 300 1 Khz 50 210 bpm European 30 240 bpm Americas Within European standard LCD heart rate and pulse indication Differential External pressure transducer 0 5 Hz 0 100 LCD Toco level indication strip chart recorder and alphanumeric display module Printhead Resolution Speeds Paper Paper type Display Keys Indicators Power Supply AC input voltage Frequency Power Enclosure Material Safety Classification Computer interface Transfer Data Rate Data Standard Data Format 4 inch thermal solid state printhead 8 dots mm 1 2 3 cm min Roll or Z fold Plain black thermal 32 character by 2 line LCD display module 6 Keys for paper start stop Volume up Volume down HR1 2 Toco Zero and Event Green power on off 200 260 100 130 User selected 46 64 Hz 60VA Steel Class 1 Type B IEC60601 1 3 wire RS232 9600 baud 8 bits no parity 1 stop bit UltraTec Comms Standard Ultrasound Technologies Ltd Issue 3 December 2001 Page 4 Ultrasound Technologies Ltd User Configuration Firstly connect the AC supply cord Itis necessary to set the operation of to meet your requirements Before turning on press and hold down the Zero button Then whilst keeping the Toco Zero button pressed down turn the on by flicking the AC input
24. Ultrasound Technologies Ltd UltraTec PFM1s2 Service Manual Issue 3 Ultrasound Technologies Ltd e Contents 3 OSES Ultrasound Technologies Ltd Issue 3 December 2001 Page 2 Ultrasound Technologies Ltd This booklet explains the operation of the PFM1 Antenatal Cardiotocograph Care has been taken during the design and manufacture of this product so that it meets all of the current safety standards set down by IEC601 1 1988 If you require assistance understanding any part of this document or have any questions relating to the operation of the please contact Ultrasound Technologies Ltd Lodge Way Caldicot NP26 5PS UK Tel 44 0 1291 425425 Fax 44 0 1291 427093 EMAIL service ultrasound demon co uk This service manual contains circuit descriptions diagrams parts and spares lists is available for the that are correct at the time of printing Due to continuous improvement certain sections may differ in newer units if you have any doubt please contact the address above To maintain the PFM1 s performance it is recommended that it be included in a periodic maintenance programme Ultrasound Technologies Ltd Issue 3 December 2001 Page 3 Specification Ultrasound Frequency Transducer Audio Response Range Power Output Indicators Toco Transducer Response Scale Indicators Data Presentation
25. Zero button once You are then prompted to enter the Toco Filter Value This sets the filtering within the monitor to produce a smoother Toco trace if required The filter can remove some of the maternal breathing artefact It is set by pressing the Volume Up button for a value soothing value between 1sec and 2sec When the correct filter value is displayed press the Toco Zero button once You are then prompted to enter the Toco Range This sets the response of the Toco transducer to either a full scale of 100 or 200 on the chart print out It is set by pressing the Volume Up button for a value between 100 and 200 When the correct range is displayed press the Toco Zero button once Ultrasound Technologies Ltd Issue 3 December 2001 Page 5 Ultrasound Technologies Ltd You are then prompted to enter the Chart recorder speed This sets the initial turn on speed of the chart recorder Then once the chart is running the speed can be further changed to 1 2 or 3 cm min It is set by pressing the Volume Up button for a value of 1 2 or 3 cm min When the correct speed is displayed press the Toco Zero button once You are then prompted to select the Data Block on or off The Data Block is printed at the start of each recording this function can be disabled by setting Data Block to off It changes from on to off and back again by pressing the Volume Up button When the Data Block is set to your requirements press the Toco Zero butt
26. ay FM1D105 Printer Cross Brace FM1D106 Recorder Hinge Block FM1D117 Door Hinge Bar FM1D116 Paper tray side plate FM1D118 Printer roller bush FM1D111 Printer inner door FM1D114 Printer catch clamp 10115 Printer Door top FM1D100 Printer Door middle FM1D101 Printer Door botton FM1D102 AAA Spring RH F2648 Spring RH F2649 Spring LCM 060C 8 MW Southco Catch E4 10 103 10 Tyrap TB RSTY100 18 100 Eclip SFCSMO0032 Eyelet Connector 4mm Faston Connector Screws M3x8 pan ss Screws M3x6 pan ss printhead fixing Screws M3x6 csk ss Washers plane ss 14 Shakeproof internal ss 14 Nuts M4 Full ss 3 Washers M4 Plane ss 3 Shakeproof M4 internal ss 3 1 TOCO Transducer Ultrasound Technologies Ltd Issue 3 December 2001 Page 21 Ultrasound Technologies Ltd Device Value Quantity PFM1 US Buckle Grey TM1D101 104 1 PFM1 Transducer Cover TM1D100 104 1 PFM1 Toco Faceplate TM1D102 103 1 PFM1 Toco Button TM1D106 102 1 Toco Cable Assembly TM1D112 1 Strain Gauge and Diaphragm FMD105 101 1 Connector Plug Redel Grey PAG M0 5GL AC39G 1 Screw Stainless steel 2 5 mm pan 5 Screw Stainless steel M3x6 mm Pozi csk 1 Insert KFS2 M3 1 FM1D110 1 1 Ultrasound Transdcuer 1 5MHz US2 Device Value Quantity PFM1 US Buckle Blue TM1D101 104 1 PFM1 Transducer Cover TM1D100 104 1 PFM1 Transducer Faceplate TM1D104 103 1 Ultras
27. nal ss Full ss M3 5x10 pan ss 5 internal 55 Issue 3 December 2001 Quantity 0 1 gt Ultrasound Technologies Ltd Page 20 a TO m m I Ultrasound Technologies Ltd LCD MDLS16268C LV 1 Molex Housing M 22 01 2115 15 Way 1 Molex Crimps 14 Top Cover Bush FM1D110 2 Spacer Switch Board 3 3mm x 8mm AI FEC 151 045 4 Spacer Display 3 3mm x 6mm ss FEC 146 4 322 Spacer Display MG plain ss washer fit between 8 spacer and Lid Faston Connector 0 25in shrouded 1 Eyelet Connector 4mm 1 FEC 712 176 White UL 1061 FEC 0 09 Tyrap TB RSTY100 18 100 4 Washers Display and switch fixing plain ss 8 Shakeproof Display and switch fixing internal ss 8 Nuts Display and switch fixing Full ss 8 Screws Lid fixing M3 5x10 pozi pan ss 4 Shakeproof Lid fixing M3 5 internal ss 4 Washers Lid fixing M3 5 plain washer ss 4 Shakeproof Earth Bond Fixing internal ss 1 Nuts Earth Bond Fixing M4 Full ss 1 PFM1 Switch PCB Assembly 1 Recorder Assembly Device Ref Quantity Printhead QP104 1 Stepper Motor 103H546 0410 1 Molex Housing 4 way 1 Molex crimps 4 Gear Motor 28MP025 1 Gear Print roller 15MP025 1 Gear Belt 53MP025 1 Recorder Roller FM1D120 1 Printhead connection FM1D125 1 cable Printer side left FM1D103 Printer side right FM1D104 Printer Paper tr
28. ng an arrow in the gap between the FHR and UA traces The maximum voltage that can be applied to this output is 15VDC Probe Connections US1 US2 Toco This is for the connection of approved Doppler and toco transducers The maximum voltage that can be applied to this output is 15VDC Ultrasound Technologies Ltd Issue 3 December 2001 Page 10 Ultrasound Technologies Ltd Internal Layout With the top cover removed and the front panel facing you there is one large printed circuit board fixed to the base of the monitor this contains all the power supply circuits printer drive circuits all the control circuits and the Ultrasound Toco and digital signal processing circuits In addition there is the Front panel displays and keyboard circuit card mounted on the Lid of the unit Dismantling Procedure Note Before disassembling the unit unplug the transducers accessories cable if present and the power cord from the instrument To remove the Top Cover remove the four screws around the edge at the rear of the unit Carefully push the lid forward until it touches the recorder door and then from the rear lift the lid slightly When raised by about 10 mm continue to push the lid forward until it has cleared the connectors then raise to its full height The Top Cover can now be removed taking care to disconnect the earth bonding cable
29. on once You are then prompted to select the Tachycardia Alarm on or off The Tachycardia Alarm is triggered when the system detects a Tachycardia above 170 bpm and an alarm tone sounds The alarm is tone is stopped by pressing the units volume button Tachycardia Alarm can be set to on to off and back again by pressing the Volume Up button When the Tachycardia Alarm is set to your requirements press the Toco Zero button once You are then prompted to select the Bardycardia Alarm on or off The Bradycardia Alarm is triggered when the system detects a Bradycardia below 100 bpm and an alarm tone sounds The alarm is tone is stopped by pressing the units volume button Bradycardia Alarm can be set to on to off and back again by pressing the Volume Up button When the Bradycardia Alarm is set to your requirements press the Toco Zero button once The PFMI will then restart and operate according to your settings The is now operational and the LCD screen will show 081 us2 Gf the unit is only a single fetus monitor it will only display 081 and a Toco value Special Precautions Your PFMI Antenatal Cardiotocograph has been designed for electrical safety the safety and operating instructions should be read before operating the PFMI Failure to do so could result in injury to the user patient or damage to the System and accessories Electrical Shock Hazard Do not defeat the grounding integrity of this System
30. option of two ultrasound circuits which operated at different frequencies the operation of each is identical as so only one is described here The current nominal frequencies are 2 1 MHz for 051 and 1 8MHz for 052 Oscillator and Transmitter output forms an oscillator with Q4 and its associated capacitors producing a sine wave drive at the required frequency This is fed via a high current output driver Q1 and output transformer LI Receiver and Detector The reflected Ultrasound signal is fed via a resonant transformer L1 to the gate of Q3 the drain of this FET connects to the source of Q2 to form a cascode amplifier From the drain of Q2 the amplitude complex of the received signal is detected by passing the signal through a detector diode D3 The raw low frequency heart complex is then amplified and filtered by Ul where its associated components form a bandpass filter amplifier with a bandwidth of 150Hz to 1KHz This signal is passed to the audio section and the signal pre processing Audio Amplifier The audio signal then passes to a input selector U25 where the user can select via the front panel which Ultrasound channel will pass to the audio circuits and then to digital gain control U24 and buffer amplifier U32 where the volume setting is determined by the microprocessor subject to the user setting From here the gain controlled signal is fed to the input of a monolithic power amplifier U27 and from here to the loudspeaker at J1
31. ound Cable Assembly TM1D111 1 Crystals 1 8 MHz 10mm 6 Connector Plug Redel Blue PAG M0 6GL AC39A 1 Insert PEM KFS2 M3 1 Screw Stainless steel M2x5 mm Pozi pan 3 Screw Stainless steel M3x6 mm Pozi csk 1 PCB TM1D105 Ultrasound Transducer 2 1MHz US1 Device Value Quantity PFM1 US Buckle Yellow TM1D101 104 1 PFM1 Transducer Cover TM1D100 104 1 PFM1 Ultrasound Faceplate TM1D104 103 1 Ultrasound Cable assembly TM1D111 1 Crystals 2 1MHz 10mm 6 Connector Plug Redel Yellow PAG M0 4GL AC39J 1 Insert PEM KFS2 M3 1 Screw Stainless steel M2x5 mm Pozi pan 3 Screw Stainless steel M3x6 mm Pozi csk 1 TM1D105 1 Ultrasound Technologies Ltd Issue 3 December 2001 Page 22 Ultrasound Technologies Ltd This section contains the following circuit diagrams PCB circuit Placement Diagram Ultrasound 1 Circuit Ultrasound 2 Circuit Digital Printer Control and user interface Circuit Power Supplies and Audio Circuit Toco Circuit This section contains the following engineering drawings Pfml Interconnection Detail General Assembly Recorder Assembly Ultrasound Transducer Assembly TOCO Transducer Assembly Ultrasound Technologies Ltd Issue 3 December 2001 Page 23
32. ovide a stable 12V DC after regulator transistor Q14 D19 also supplies current to the printhead and motor drive circuits via Q13 and U30 which provides a stable 24V Printhead and Motor Drive Supply The printhead requires pulses of current equalling 10A but for a very small amount of time therefore current is taken from the charge built up in C130 rather than expecting the power supply to supply the pulses Q13 is connected as an ON OFF switch to the printhead voltage circuits to act as protection An explanation of its operation can be found in section PRINTER INTERFACE When ON current is fed to U30 connected as a variable voltage regulator with a range of 18 v to 24 v where VR1 adjusts this voltage Ultrasound Circuit Overview The ultrasound circuit is built up of four discrete sections These are Oscillator and Transmitter amplifier Receiver and Detector Audio amplifier Signal pre processing These operate to produce a continuous wave of 2MHz ultrasound which is passed to the transmitter crystal in the transducer The signal is then reflected from moving interfaces within the body to the receiver crystal in the transducer amplified and then detected so the audio Doppler shift of that moving interface can be heard audibly or passed via signal pre processing to the A D converter for rate calculation Ultrasound Technologies Ltd Issue 3 December 2001 Page 13 Ultrasound Technologies Ltd The circuit board has the
33. rasound control channel for audio output Recorder On Off and speed change This key is used to control the operation of the recorder Press once and the chart recorder will start each consecutive short press will change the speed Press and hold the key will stop the recording Event Mark 1 Places an event mark arrow at the top of the FHR scale Volume Up This key is used to increase the audio volume level or in configuration mode to change user options Volume Down This key is used to decrease the audio volume level US1 052 Transducer Select Pressing this key changes the selected probe from US1 to US2 for volume output This is used when the unit is in Twins mode with two US channels for listening to either of the two fetus Toco Zero This key zeros the toco trace to the selected baseline Ultrasound Technologies Ltd Issue 3 December 2001 Page 9 Ultrasound Technologies Ltd Inputs outputs and displays Power on Indication The green LED associated with the above symbol when bright indicates that power is connected to the apparatus RS232 output This output is for the connection of an external computer for data transfer The maximum voltage that can be applied to this output is 15VDC WARNING external equipment connected to this output must meet the relevant safety standard Remote Event Marker Connection of an external event mark switch allows the patient to indicate events by printi
34. transducer or cable damage could occur A H s 5 Ultrasound Technologies Ltd Issue 3 December 2001 Page 7 Symbols used Ultrasound Technologies Ltd The following symbols are used on the and are in accordance with IEC60601 1 1990 Where they are associated with the connection of external equipment that equipment in all cases must meet the relevant safety standard p5 os Alternating current Associated with power on indicator Type B Equipment Unit classification Off power disconnection from the mains On power connection to the mains Attention consult accompanying documents Associated with auxiliary connections see operating instructions Dangerous voltage Associated with components internal to the Ultrasound Technologies Ltd Issue 3 December 2001 Page 8 Ultrasound Technologies Ltd front panel controls The front panel keyboard area contains 6 keys used to control the operation of the unit they are all indicated by Icons to aid language variations Volume Up Event mark 1 Pl 1 aces BOW in Volume Down upper portion of chart H Mains ON indicator Toco Zero Sets toco channel to h preset baseline value 3 Recorder On Off and speed Select Ult
35. v Thy gain 007 JO To si 20 SV sio w dn Wd EPA To 0 Ig a Ww TN 19 A FO I aw 09 V so Bran Tog er ov CU A 76 Thi 5 Toa i 9 OV orto B UN 20 dO or A sr zen toy 85 99 914 0201 9897 io SERIES 28 5v K 020 0 201 RA Kejdsiq joueq W014 UEM Lz eeaferdsia alo e 9jereaferdsia ao L 19 sleeaAeldsig zo aua an e ereafeidsia Li eeaferdsia 5 T zsa isa Lm 8 1 9 v i 50 Y 19905 OWEN 289 10 6661 791201 Wd 20 7 2 00 81 04 SYN weg s s 104
36. will return to baseline Event Marker 11 Connect the hand held remote event marker to the external mark socket Depress the button once and note that a half arrow is printed on the bottom of FHR recording Ultrasound Technologies Ltd Issue 3 December 2001 Page 16 Ultrasound Technologies Ltd Setting up the monitors The mode of operation of the monitor is programmable through the front panel to give a certain amount of customisation The programming mode is entered by pressing and holding UA Zero while turning the monitor ON Details of the user programmable options are at the beginning of this manual Ultrasound Technologies Ltd Issue 3 December 2001 Page 17 Parts lists Ultrasound Technologies Ltd The following section contains parts list for the Signal Board Device Capacitor electrolytic Capacitor electrolytic Capacitor electrolytic Capacitor electrolytic Capacitor electrolytic Capacitor Capacitor electrolytic Capacitor sm 1206 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm 0805 Capacitor sm Capacitor sm Capacitor sm IC Digital sm IC Digital sm IC Digital sm IC Digital sm IC Digital sm IC Digital sm IC Digital sm IC PSU sm IC PSU IC RTC sm IC Digital sm IC Digital sm IC Digital sm
37. x 2 way header 22 27 2021 Molex 4 way header 22 27 2041 Molex 6 way header 22 27 2061 Molex 8 way header 22 27 2081 Molex 14 way header 22 27 2141 Molex 15 way header 22 27 2151 9 way RS232C D female McMurdo R31 69 129 145 147 175 R169 R146 R113 VR1 VR2 L10 15 L12 14 L1 L5 L3 7 L4 8 L2 6 J7 11 J8 9 10 J1 2 12 J5 J4 15 way with 1 pin removed J6 SDBX25PNTD PFMI Chassis Assembly Device PFM1 Base Mains Inlet Filter Fuses Transformer Molex Housing Molex Housing Molex Housing Molex IDT Molex crimps Loudspeaker Redal Connector Redal Connector Redal Connector Jack socket Feet Spade terminal Faston Connector Eyelet Connector Tyrap Tyrap Base Spacer boards Spacer speaker Screws Screws Washers Shakeproof Nuts Screws Shakeproof PFM1 Recorder PCB PFM1 Signal Recorder Assy PFM1 Cover LCD window Value FM1D108 PSOSXDH6A 20mm 500mA T FEC 148 958 PN 22 01 2025 PN 22 01 2045 PN 22 01 2065 PN 22 50 3125 FEC 745 637 Yellow Blue Grey 0 25 in RS 226 375 0 25 rt angle 0 25in shrouded RS 543 428 RS 666 751 Assembly Assembly Assembly FM1D107 FM1D113 Ultrasound Technologies Ltd J3 Ref 60VA 25 25 2 4 6 12 way 3in 10W PLG MO 4GL LJ PLG MO 6GL LA PLG MO 5GL LG Pack of 4 3mm TB RSTY100 18 100 Hellermann MB2A NAT 25mm piller M3 Full Nut ss M3x8 pozi pan ss M3x6 pan ss plain ss M3 inter
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