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Tektronix 606B User's Manual
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1. 8068 MONITOR INTENSITY Controls brightness of the crt display Vertical Position Positions the crt beam in the Y axis Horizontal Position Positions the crt beam in the X axis FOCUS Provides adjustment to obtain a well defined display POWER indicator llluminates when instrument is on ON OFF Controls power to the monitor Insrument is on when pushbutton is in TRACE ALIGN Provides slight beam rotation for alignment in the X axis X GAIN Provides 10 adjustment of nominal X gain setting Y 10 adjustment of nominal Y gain setting D D Option 7 Front panel controls are screwdriver adjust Figure 2 1 Front panel controls and indicators Option 7 Position FOCUS and INTENSITY controls are screwdriver adjustable 2 2 e Operating Information 606B Tektronix MONITOR ALTERNATE INPUTS MAX INPUT ANALOG 35 nl CAUTION Sui FOR CONTINUED PROTECTION as AGAINST RRE HAZARD REPLACE ONLY WITH SAME TYPE AND RATING OF FUSE ELECTRIC SHOCK HAZARD DO NOT REMOVE THIS COVER OR CABINET COVERS REFER SERVICING QUALIFIED SERVICE PERSONNEL TO CHANGE LINE VOLTAGE REFER TO MANUAL WATTS MAX 16 AMPS MAX 03 AT TEN SET FOR VOLTS AC T 9i CES pens nez LEN
2. ALTERNATE INPUTS multi pin connector provides alternate inputs for the X and Z axis signals and Remote Defocus X INPUT bnc input connector to allow application of input signals A positive signal applied deflects beam to the right negative signal deflects beam to the left X INPUT bnc input connector with grounding cap A positive signal deflects beam to the left negative signal deflects beam to the right Y INPUT bnc input connector A positive signal applied deflects beam up a negative signal deflects beam down Y INPUT bnc input connector with grounding cap A positive signal applied deflects beam down a negative signal deflects beam up Z INPUT bnc input connector A positive signal applied provides a linear function to increase display brightness a negative signal decreases display brightness Z INPUT input connector with grounding cap A positive signal applied provides a linear function to decrease display brightness a negative signal increases display brightness TTL Z INPUT bnc input connector to allow application of TTL compatible voltages to unblank the crt display Line Fuse 120 V 1 2 A SLOW 220 V 0 6 A SLOW use 3 AG 250 V fuse Power Connector allows connection to the ac power source to operate the instrument D 2821 5A Figure 2 2 606B Rear panel controls and connectors REV A MAY 1980 2 3 Operating Information 606B
3. MM MM MM M pr NP EA AER isi 15 V dc Regulated 1 0 5 250 V fast biow 250 V de Regulated 0 15 A 250 V fast blow 2821 6A Figure 1 1 Location of line valtag s lector plugs regulating range pins and fuses t g REV A MAY 1980 General Information 606B INPUT IMPEDANCE SLIDE OUT TRACKS The slide out tracks provided in the conversion kits The X Y and Z Axis amplifiers of the 6068 Monitor are support the monitor in their fully extended position This shipped from the factory with an input impedance of 50 Q llows access to the instrument for maintenance without Jumpers are provided on the X Y Pre Amplifier board for removing it from the rack Be sure the power cord and the X and Y amplifiers and on the Low Voltage Power andZ _ Signal cables are long enough to allow operation in the Axis board for the Z Axis amplifier to facilitate changing extended position Refer to the instructions in the the input impedance from the factory setimpedance 50 N appropriate rackmount kit for information on track to 1 MQ i installation and adjustment Refer to Internal Control and Selector Locations foldout REMOVING OR INSTALLING THE INSTRUMENT page in Section 8 Diagrams and Circuit Board Illustrations for locations and positions E instrament can be installed or removed by following ne instructions given in Figure 1 2 No further dju
4. _ 10 Atten 606 Rear Dual Input Coupler Function Generator Ramp Generator Square Wave O Ramp Out Trig Out bnc Cables Test Equipment Controls Ramp Generator Ramp Signal Triggering AUTO Ext Amplitude full screen Function Generator Function Square wave Amplitude 2 5 V Referenced to gnd 2821 48 2821 88 Calibration Part 1 606B Performance Check a Disconnect the signal to the Y INPUT b EXAMINE That the full square wave is visible Connect the signal to the Y INPUT C Turn off the 6068 Move P176 and P179 to the LO position d CHECK That only the positive portion of the square wave is displayed e Turn off the 606B POWER Move the jumpers P176 P179 to the position f CHECK That only the negative portion of the square wave is displayed NOTE The Blanking Level Selecting jumpers should remain in the LO position for normal operation 5 25 Calibration Part 1 606 Performance Check F DYNAMIC FOCUS Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 Digital Voltmeter DVM 3 Ramp Generator 2 required 8 Digital Counter 15 bnc cables 4 required 22 24X Magnifier F1 DYNAMIC FOCUS PRELIMINARY SETUP a Perform the Performance Check Power Up Sequence given at the beginning of Part i Performance Check b Refer to Section 6 instrument Options and
5. Diode CR303 provides overdrive protection to the output amplifier REV A MAY 1980 Theory of Operation 6068 STIGMATOR 1 OUTPUT AMPLIFIER AND LEVEL SHIFTER The stigmator 1 output amplifier is a feedback amplifier consisting of 0310 0320 0330 0340 0350 0360 The feedback network consists of R373 C373 C374 with C373 and C374 supplying high frequency compensation The input signal is applied to the bases of emitter followers Q310 Q320 and fed to complimentary amplifiers Q330 Q340 Complimentary coupled emitter followers Q350 Q360 supply the high current necessary to drive the capacitive load The output signal of the stigmator 1 output amplifier at Q360 is approximately 43 volts at zero deflection and plus or minus 40 volts from the 43 V reference at maximum deflection The correction required by the stigmator 1 elements of the crt needs to be centered around the deflection plate average 125 volts Transistor Q380 and associated circuitry provides the necessary correction to shift the output voltage level before it s applied to the crt through P298 pin 1 REMOTE DEFOCUS The Remote Defocus provides a means of increasing the crt spot size The circuit creates an error in the stigmator voltage that if the crt is otherwise correctly focused will make the dot larger and stili fairly round Adjusted for a round dot rather than a small dot Quiescently Q390 is biased off When Q390 turns on either by placement of the jump
6. 13 12 T USED 41 NOT U 10 9 GROUND TTL NOT USED TTL INPUT REMOTE DEFOCUS GROUND TTL 19 NOT USED 18 GROUND 2 17 GROUND Y 16 Y INPUT 15 GROUND X 14 15V THRU 4700 LOGIC GROUND GROUND 2 Z INPUT GROUND Y GROUND X X INPUT o 9 o9 Figure 2 3 Alternate input connector data The input signal required for maximum display intensity through the Z INPUT connector is set at the factory for approximately 1 volt The input signal required to visually cut off the display intensity INTENSITY set at midrange is set at the factory for approximately 1 volt The best transient response of the Z Axis Amplifier is achieved when the input signal is the minimum required to provide the desired intensity change An additional bnc connector is provided on the rear panel for application of TTL compatible input voltages to blank the crt display The input voltage level necessary to produce blanking is internally selectable Refer to the Internal Contro and Selector Locations foldout in Section 8 Diagrams and Circuit Board Locations at the rear of the manual CHECKOUT PROCEDURE The Checkout Procedure may be used to verify proper operation of the front panel controis and for familiarization with the instrument Only instrument functions not measurement quantities or specifications are checked in the procedure therefore
7. 606B Adjustment and Performance Check Check that the Input Impedance Selecting jumpers for the X and Y Amplifiers are in the 50 Q position 6 Check that the crt has an implosion shield with 8 x 10 division graticule 7 Connect the Monitor and appropriate test equipment to the power source 8 Set 6068 INTENSITY to midrange m n a CAUTION 0 Do not allow a high intensity dot to remain stationary on the crt The crt phosphor could be permanently damaged 9 Switch on the Monitor and appropriate test equipment and allow at least 20 minutes warmup before proceeding 5 29 Calibration Part lI 606B Adjustment and Performance Check A POWER SUPPLIES Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 Digital Voltmeter DVM low voltage supplies 2 DC Voltmeter high voltage supply 21 Variable AC Power Supply A1 POWER SUPPLIES PRELIMINARY SETUP a Perform the Adjustment and Performance Check Power Up Sequence b Refer to Section 6 Instrument Options and the Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMI INTERNAL CONTROL AND SELECTOR LOCA pages in Section 8 Diagrams and Circuit Board Illustrations d Set 606B controis INTENSITY neo eot fully counter clockwise Vertical and Horizontal Position off screen A2 ADJUST 15 V SUPPLY NOT
8. C4 CHECK HORIZONTAL BANDWIDTH NOTE if the preceding step was not performed first perform step C1 then proceed C4 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear Ramp Generator Sine Wave Generator Ramp Out bnc Cables Test Equipment Controls Ramp Generator 2 err xir e UTR 10 msec Triggering 2 tAUTO Amplitude sc ood co ee oy eats wih ba ce cee wd set for 8 div deflection Sine Wave Generator Frequency 50 kHz Amplitude Set for 8 div deflection 2821 34 2821 77 a Slowly increase the Sine Wave Generator output frequency until the display amplitude is 5 6 divisions b CHECK That the Sine Wave Generator frequency is at least 3 MHz C5 CHECK HORIZONTAL INPUT ATTENUATION NOTE if the preceding step was not performed first perform step C1 then proceed C5 SETUP CONDITIONS 6068 Controls Power 606B Rear bnc Cables Ramp Generator Calibration Generator Ramp Out Trig In High Amp Output Dual input Coupler Test Equipment Controls Ramp Generator Duration ed Triggering e AUTO Ext Calibration Generator Output Std Ampl Amplitude Period 2821 35 2821 78 a Set the and atten switches S100 S105 in the 5X position back Turn on the 606B POWER b CHECK For 8 divisions of hor
9. Triggering 2821 45 2821 85 a Connect a 10X probe from the test Oscilloscope vertical input to TP280 b Set the INTENSITY 606B control and Calibration Generator amplitude for 60 Volts 6 divisions amplitude as indicated on the test Oscilloscope 5 23 Calibration Part 6068 Performance Check c CHECK The square wave displayed on the test Oscilloscope for 0 6 division 3 volts or less aberrations on the top front corner of the displayed pulse NOTE Probes having an input capacitance greater than 4 pF will cause some front corner overshoot at higher output levels A 3 596 overshoot at 70 V output s normal with probes having 10 pF capacitance E3 CHECK Z AXIS AMPLIFIER BANDWIDTH NOTE if the preceding step was not performed first perform step E1 then proceed E3 SETUP CONDITIONS 6068 Controls Vertical or Horizontal Position fully clockwise 606B Rear Oscillo bne Cable Vertical input 7 Sine Wave Out 10X Probe Test Equipment Controls Sine Wave Generator Frequency Test Oscilloscope Deflection Factor Input Coupling Triggering suis d Sweep Rate AUTO Internal 10 us div 2821 46 2821 86 Connect a 10X probe from the test Oscilloscope vertical input to TP280 b Set the 6068 INTENSITY control and the Sine Wave Generator Amplitude for a 7 division 70 V display on the test Oscilloscope Make sure no clipping occurs on the test Oscilloscope
10. Adjustment and Performance Check b Refer to Section 6 Instrument Options and the Change information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foidout pages in Section 8 Diagrams and Circuit Board illustrations d Set 6068 controls INTENSITY 1 ei deter rete Visible display Vertical and Horizontal POSItIOD sis cau Position the dot to center screen within 0 2 division F2 ADJUST BIAS R306 NOTE Perform Step F1 then proceed F2 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Monitor Test Equipment Controls DVM Digital Voltmeter Range Function 2821 59 a Connect the DVM between TP370 and ground b EXAMINE For a voltmeter reading between 42 5 V and 43 5 V c ADJUST R306 Bias for a voltmeter between 42 5 V and 43 5 V reading 5 51 Calibration Part 606 Adjustment and Performance Check F3 ADJUST FOCUS AND STIGMATORS WITH DOT GENERATOR NOTE Perform Step Fi then proceed If a dot Generator is unavailable go to Step F4 Adjust Focus and Stigmators Without Dot Generator SETUP CONDITIONS 6068 Controls Detocus internal jump FOCUS INTENSITY Position 8 Midrange lt fully CCW Dot Generator 606B Rear x 2 Out Out Out bnc Cables Oscillo scop
11. 20 cm of screen center Spot must reach new writing position within 0 008 cm 0 003 inch within 700 ns C3 Check Horizontal Settling Time C5 Check Horizontal Settling Time Risetime 116 nsec or less Common Mode Rejection Atten in X1 Position DC to 500 kHz At least 100 1 for signals of V peak or less 500 kHz to At least 40 1 for signals 1MHz of 15 V peak or less Atten in X5 Position DC to 500 KHz At least 40 1 for signals of 15 V peak or less Does not normally require cu stomer verification However risetime can be calculated from the Horizontal Bandwidth C6 Check Horizontal Common Mode Rejection C8 Check Horizontal Common Mode Rejection 5 4 TABLE 5 2 CONT Performance Check Summary Calibration 6606B Characteristic Performance Requirement Part Performance Check Procedure Title i Part lI Adjustment and Performance Check Procedure Title Maximum Non Destructive Input Voltage fault condition only 1 MQ input impedance 100 V or 100 V dc peak ac 50 Q input impedance 15 V or 5 V dc peak ac Position Range Spot can be positioned anywhere on the screen Specification applicable under fault condition only therefore this is not a procedural check q C2 Check Positioning and Gain C3 Adjust X Amplifier Gain and Check Positioning Posit
12. COMPOSITION TANTALUM CAPACITORS RESISTORS ELECTROLYTICS RESISTORS CAPACITORS DIPPED SIGNIFICANT TANTALUM COLOR FIGURES MULTIPLIER r5 crance MULTIPLIER TOLERANCE VOLTAGE OHMS OVER 10pF UNDER 10 i 4 BLACK 0 1 E 1 20 2 4 0 4 BROWN 1 10 i196 10 1 6VDC RED 2 102 or 100 i296 102or 100 2 10VDC E 4 ORANGE 3 1030r 1 K 3 103 or 1000 3 15VDC i YELLOW 4 104 or 10K t4 104 or 10 000 20VDC 5 GREEN 5 105 or 100K 1 2 067 25VDC 6 BLUE 6 106 or tM 1 4 M lin pen M 3svoc Ec T VIOLET 7 Eu 1 10 10 ds 00 50VDC 80 2 0 25 E 1g id 10 S D GOLD em 101 or 0 1 15 ds wee SILVER 10 0 01 10 ee TS 4 20 1096 1 1862 74 1866 57 1 Figure 4 1 Color code for resistors and capacitors e 4 3 Maintenance 6068 INDEX L PLASTIC CASE METAL CASE TRANSISTOR TRANSISTOR METAL HEAT SINK POWER TRANSISTORS POWER L DUAL METAL INTEGRATED TRANSISTOR CASE FET CIRCUIT 1 INDEX configuration may vary from one IC to the next 821 11 2 Figure 4 2 Semiconductor lead configuration 4 4 e END LEAD MULTI PIN CONNECTOR END LEAD MULTI PIN CONNECTOR MULTI PIN CONNECTOR INDEX 2821 12 Figure 4 3 Orientation of multi pin
13. Connect the DVM between TP280 Z Axis output and ground Rotate the INTENSITY control till a reading of 20 V is measured at TP280 NOTE The intensity is now set to approximately 3 5 uW cm This setting is sufficiently accurate under norma circumstances for verification of the spot size however a photometer may be used if available Place the Photometer probe against the face of the crt while displaying a 700 line 7 x 9 cm raster Rotate the INTENSITY until reading of 3 5 uW cm is read on the photometer b Disconnect the DVM Do not move the INTENSITY control Using the Level control of Ramp Generator provide a synchronized raster d While viewing the raster with a 24X magnifier rotatethe duration multiplier Ramp Generator A clockwise until the lines just merge to a uniform field REV A MAY 1980 Calibration Part i 606B Performance Check e Record the Counter reading f Turn off the 606B POWER g Interchange the 606B X and Y inputs to check horizontal spot diameter h Turn on the 6068 POWER i Set the Amplitude of Ramp Generator B to provide exactly one inch of deflection j Repeat part d CHECK The average of the present Counter reading and the reading recorded in part e The average of the two readings must be 0 0031 inch or less i Turn off the 606B POWER This completes the Part 1 Check procedure 5 27 Calibration Part lI 606B Adju
14. DETAILED OPERATING INFORMATIO SIGNAL CONNECTORS INPUT SIGNAL REQUIREMENTS 5 CHECKOUT PROCEDURE pg 715 VOLT REGULATED SUPPLY TEST EQUIPMENT REQUIRED INTERCONNECTIONS PRELIMINARY SET Sp DISPLAY FUNCTIONS s 4 MAINTENANCE DEFLECTION AND Z AXIS FUNCTIONS PREVENTIVE MAINTENANCE 44 VISUAL INSPECTION 244 SECTION 3 THEORY OF OPERATION 7 CLEANING 41 BLOCK DIAGRAM it eee eee EXTERIOR 4 1 DETAILED CIRCUIT OPERATION CRI S od ross 241 HORIZONTAL X AMPLIFIER INTERIOR 24 1 MINPUTS pear e iet 3 SEMICONDUCTOR CHECKS 244 X PREAMPLIFIER PERIODIC ELECTRICAL ADJUSTMEN 244 SCAN LIMITER TROUBLESHOOTING 4 X FOCUS CORRECTION PICKOFF X OUTPUT AMPLIFIER VERTICAL Y AMPLIFIER DIAGRAMS CIRCUIT BOARD ILLUSTRATIONS 3 Y INPUTS TROUBLESHOOTING CHART Y PREAMPLIFIER TEST POINT AND ADJUSTMENT SCAN LIMITER LOCATIONS 442 Y FOCUS CORRECTION PICKOFF e 4 2 Y OUTPUT AMPLIFIER 2 SEMICONDUCTOR LEAD CONFIGURATIONS 4 2 Z AXIS AMPLIFIER MULTI PIN CONNECTOR HOLDERS ZINPUTS TROUBLESHOOTING EQUIPMENT Z PREAMPLIFIER cire see eer Dueh prse TA TROUBLESHOOTING TECHNIQUES LIMITER 1 CHECK CONTROL SETTINGS Z FOCUS CORRECTION PICKOFF Z OU
15. and ground Rotate the INTENSITY control till a reading of 20 V is measured at TP280 REV A MAY 1980 Calibration Part lI 606B Adjustment and Performance Check NOTE The intensity is now set to approximately 3 5 uW cm This setting is sufficiently accurate under normal circumstances for verification of the spot size however a photometer may be used if available Place the photometer probe against the face of the crt while displaying 700 line 7 x 9 cm raster Rotate the INTENSITY until a reading of 3 5 uW cm is read on the photometer b Disconnect the DVM Do not move the INTENSITY control c Using the Level control of Ramp Generator A provide 8 synchronized raster d While viewing the raster with a 24X magnifier rotate the duration multiplier Ramp Generator A clockwise until the lines just merge to a uniform field e Record the Counter reading f Turn off the 6068 POWER g Interchange the 6068 X and Y inputs to check horizontal spot diameter h Turn on the 6068 POWER i Set the amplitude of Ramp Generator B to provide exactly 1 inch of deflection j Repeat part d k CHECK The average of the present Counter reading and the reading recorded in part e The average of the two readings must be 0 0031 inch or less Turn off the 606B POWER m Remove all test equipment from the Monitor This completes Part II Performance Check and Adjustment 5 55
16. including necessary tools instructions and replacement pins with attached spare ferrules is available from Tektronix Inc Order Tektronix Part 040 0542 00 To replace a damaged pin first disconnect any pin connectors Then unsolder see Soldering Techniques the damaged pin and pull it from the board with a pair of pliers leaving the ferrule see Fig 4 11 in the hole if possible If the ferrule remains in the circuit board remove the spare ferrule from the replacement pin and press the new pin into the hole in the circuit board If the ferrule is removed with the damaged pin clean out the hole using solder removing wick and a scribe Then Maintenance 606B REPLACEMENT PIN FERRULE PROPER PLACEMENT OF FERRULES IN CIRCUIT BOARD 2821 24 Figure 4 11 Exploded View of circuit board pin and ferrule press the replacement pin with attached spare ferrule into the hole Position the replacement pin in the same manner as the original pin had been Solder the pin to the circuit board on each side of the circuit board If the original pin was bent at an angle to mate with a connector carefully bend the new pin to the same angle Replace the pin connector END LEAD PIN CONNECTORS The pin connectors used to connect the wires to the interconnecting pins are clamped to the ends of the associated leads To remove or replace damaged end lead pin connectors remove the old pin connector from the end of the lead and cl
17. 1 606 Performance Check PART I PERFORMANCE CHECK The following procedure Part Performance Check verifies electrical specifications without making internal adjustments All tolerances given are as specified in the Specification tables section 1 in this manual Part ll Adjustment and Performance Check provides the information necessary to 1 verify that the instrument meets the electrical specifications 2 verify that the controls function properly and 3 perform all internal adjustments A separate Checkout Procedure is provided in section 2 to provide instrument familiarization and to verify that the controls function properly See Table 5 1 Calibration Procedure Electives at the beginning of this section for information on performing a Partial Part Performance Check procedure INDEX TO PART 1 PERFORMANCE CHECK PAGE A POWER SUPPHES cca ce eee re 5 13 B CRTu idu eae wes Pet a cen Lene ama 5 14 1 Crt Preliminary 5 14 2 Check Orthogonality 0 0 6 ccc cece ee eee 5 14 3 Check Geometry 5 14 C HORIZONTAL X 5 15 1 Horizontal X Amplifier Preliminary Setup 5 15 2 Check Positioning and 5 15 3 Check Horizontal Settling 5 16 4 Check Horizontal Bandwidth 5 16 5 Check Horizontal Input Attenuation 5 17 6 Chec
18. 1 V square wave signal to the Z INPUT connector g ADJUST R124 Z Axis Gain so that the upper level of the square wave displayed on the test Oscilloscope is 70 volts higher than the cutoff level noted in step e h Check the 6088 for a fully brightened trace 5 48 E3 ADJUST Z AXIS COMPENSATION R239 AND C285 AND CHECK ABERRATIONS NOTE If the preceding step was not performed first perform step then proceed SETUP CONDITIONS 6068 Controls Make no changes to the control settings Test Oscillo scope 606B Rear Panel Vertical Input Fast Rise Out 10X Probe Test Equipment Controls Calibration Generator Output Ameren fast rise Period 10 us 100 kHz Test Oscilloscope Deflection Factor 10 V Div Sweep Rate input Coupling Triggering 2821 45 a Connect a 10X probe from the test Oscilloscope vertical input to TP280 6068 b Set the INTENSITY 6068 contro and Calibration Generator amplitude for 60 Volts 6 divisions amplitude as indicated on the test Oscilloscope c CHECK The square wave displayed on the test Oscilloscope for 0 6 divisions 3 volts or less aberrations the top front corner of the displayed pulse NOTE Probes having an input capacitance greater than 4 pF will cause some front corner overshoot at higher output levels A 3 5 overshoot at 70 V output is normal with probes having 10 pF capacitance
19. 4 Turn the Vertical and Horizontal Position controls and notice that the spot position can be controlled by both controls DEFLECTION AND Z AXIS FUNCTIONS 1 Perform the Preliminary Set Up procedure 2 Set the function generator for a 1 volt peak to peak 50 kilohertz sine wave output as measured through a ohm terminator 3 Connect the function generator output to the rear panel X INPUT connector via the 42 inch cable and the 50 ohm terminator 4 Center the display with the horizontal Position control and check for 8 divisions of horizontal deflection 5 Remove the grounding cap from the X INPUT connector 6 Disconnect the signal from the X INPUT connector and apply it to the X INPUT connector through the 50 ohm terminator 7 Place the grounding cap on the X INPUT connector 8 Center the display with the horizontal Position control Operating Information 6068 9 Check for 8 divisions of horizontal deflection 10 Disconnect the signal from the X INPUT connector and apply it to the Y INPUT connector through the 50 ohm terminator 11 Center the display on the crt with the vertical Position control 12 Check for 8 divisions of vertical deflection 13 Remove the grounding cap from the Y INPUT connector 14 Disconnect the signal from the Y INPUT connector and apply it to the Y INPUT connector through the 50 ohm terminator 15 Place the grounding cap on the Y INPUT connector 16
20. Adjust Focus and Stigmators without Dot Generator nn Connect the DVM between TP280 Z Axis output and ground Provide synchronized non merged raster covering an area of 1 square inch on the screen pp Turn the INTENSITY control to obtain a 60 V reading at TP280 qq ADJUST R455 Z Focus for best focus rr Turn INTENSITY down F5 CHECK SPOT DIAMETER NOTE If the preceding step was not performed first perform step F1 then proceed F5 SETUP CONDITIONS 606B Controls INTENSITY fully counterclockwise bnc Cable Ramp Generator A 606B Rear Panel Ramp Out Gate Out bnc Cables gt Ramp Generator B Ramp Out O Trig In O Gate Out Dual input Coupler bnc Cables gt Counter Test Equipment Controls Ramp Generator A Ramp Signal 100 us Triggering AUTO Amplitude provide approx 1 inch deflection Ramp Generator Ramp Signal 2 10 ms Triggering i n norm Ext Amplitude provide exactly 1 inch deflection Counter Atten 2 1 Coupling IAN Function Ratio A B averaged over 10 cycles of B Slope 2 NESSES d Slope DVM Digital Voitmeter Range Function 2128 58 2821 74A a Connect the DVM between TP280 Z Axis output
21. Center the display on the crt with the vertical Position control 17 Check for 8 divisions of vertical deflection 18 Adjust the INTENSITY controi for a barely visible display 19 Remove the grounding caps from the X INPUT and the Z INPUT connectors 20 Disconnect the signal from the Y INPUT connector and apply it to the X INPUT and the Z INPUT connectors via the 42 inch cable bnc to bnc adapter bnc T connector and the two 18 inch cables Connect a 5X attenuator between the 18 inch cable and the Z INPUT 21 Place the grounding caps on the X INPUT and the Z INPUT connectors 22 Notice that the right end of the crt display becomes bright and that the left end disappears 23 Remove the grounding cap from the Z INPUT connector 24 Disconnect the signal from the Z INPUT connector and apply it to the Z INPUT connector through the 5X attenuator 25 Place the grounding cap on the Z INPUT connector 26 Notice that the left end of the crt display becomes bright and that the right end disapppears 27 Disconnect the Function Generator This completes the Checkout Procedure 2 5 Section 3 606B THEORY OF OPERATION This section of the manual describes the circuitry in the 606B Monitor The description begins with a discussion of the instrument using a block diagram then continues in detail showing the relationships between the stages in each major circuit Schematics of all major circuits are g
22. Generator Output Ramp Out Trig Out O Trig In X bnc Cables Test Equpment Controls Ramp Generator Duration 10 ms Triggering AUTO Ext Amplitude set for 10 div deflection Function Generator Function Sine wave Frequency 500 kHz Amplitude 8 V 2821 42 a Move the 50 0 1 Y INPUT Impedance Selecting Jumpers to the 1 MQ position b Turn on the 606B POWER c Connect the Function Generator output to the test Oscilloscope vertical input Do not terminate d Set the Function Generator controls for a kHz 3 volt p p sine wave as indicated on the test Oscilloscope e Disconnect the sine wave signal from the test Oscilloscope and connect it using the dual input coupler to both the Y and Y INPUT connectors on the 606B f CHECK For 0 24 division or less of free running vertical display on the 6068 position as necessary 9 Turn off the 606B POWER Set S200 Y Atten and 105 Y Atten to the 5X position switches back h Turn on the 6068 POWER 5 45 Calibration Part 606 Adjustment and Performance Check i Repeat part c and d then increase the Function Generator output to 15 volts p p j Repeat part e CHECK For 0 6 division or less of free running vertical display on the 6068 position as necessary Turn off the 6068 POWER Return S200 Y ATTEN and 105 Y
23. INPUT bnc connector J70 or ALTERNATE INPUTS connector see Fig 2 3 may be either a TTL LO 0 to 0 8 volt or a TTL level 2 4 to 5 volts The TTL level necessary to provide blanking of the crt display is determined by the blanking level selecting jumpers P176 and P179 With P176 P179 in the plus position a TTL LO level will blank the display with P176 P179 in the minus position a TTL Hi level will blank the display Refer to internal Control and Selector Locations foldout in section 8 for locations of jumpers With no signal applied to the TTL INPUT connector an internal pull up circuit consisting of R175 and R176 will pull the input to a TTL HI level 3 5 Theory of Operation 606B Transistors 0170 0175 are connected as a voltage comparator The reference voltage for the comparator developed across R178 and R179 is approximately 2 volts In the blank position as shown on the schematic input signals are applied to Q170 and the base of Q175 is connected to the reference voltage A HI TTL input turns off Q175 and turns on Q165 The bias on Q165 with Q175 off is approximately 10 volts which when Q165 conducts forward biases CR170 The TTL blanking stage overrides Z Preamplifier signals and clamps the output of the Z Axis Amplifier LO e DYNAMIC FOCUS The Dynamic Focus circuit provides focus correction as the crt beam is deflected to the edges of the display area both the vertical Y and horizont
24. Line Voltage Range 180 to 220 V ac L 220 V ac M 220 V ac 198 to 242 V ac H 240 V ac 218 to 250 V ac Line Frequency 48 to 440 Hz Power Consumption Maximum 75W 120 V ac 60 Hz Nominal BOW 120 V 60 Hz 1 10 REV A MAY 1980 TABLE 1 3 CONT Electrical Characteristics General information 606B Characteristic Performance Requirement Fuse Data LO Line Voltage Slow blow 1 2 Amp HI Line Voltage Slow blow 0 6 Amp POWER SUPPLIES Supply dc Voltage Range Ripple p p 15 V dc 15 2 V to 14 8V 2 mV or less 15 V dc 14 95 V 911505 V 2 mV or less 95 V dc 94 0 V to 98 0 V 7 100 mV or less m 250 V dc 249 V to 251 V 150 mV or less 5 4 kV dc 5 35 kV to 5 45 kV TABLE 1 4 Environmental Characteristics Characteristic Information Ventilation Convection cooling m Position Instrument has to be positioned with the bottom or the tegr panel down within 45 degrees Temperature ambient Operating 0 C to 60 C 432 F to 122 F Nonoperating 40 C to 70 C 40 F to 158 F Altitude Operating n Ta 4 5 km 15 000 ft Nonoperating eTes 4 5 km 50 000 ft Vibration With the instrument complete and operating vibration frequency swept 10 to to 10 Hz at 1 minute per
25. Selector plug has been set to the appropriate line voltage and range See Fig 1 1 of Section 1 General Information 3 Check the rear panel to determine which options have been installed in your Monitor 4 Check that grounding caps are on the INPUTSs 5 Check that the Input Impedance Selecting jumpers for the X and Y Amplifiers are in the 50 Q position 6 Check that the crt has an implosion shield with 8 x 10 division graticule 7 Connect the Monitor and appropriate test equipment to the power source 8 Set 606B INTENSITY to midrange CAUTION Do not allow a high intensity dot to remain stationary on the crt The crt phosphor could be permanently damaged 9 Switch on the Monitor and appropriate test equipment and allow at least 20 minutes warmup before proceeding A POWER SUPPLIES There are no performance checks for the Power Supplies Calibration Part 606B Performance Check Calibration Part 1 606 Performance Check B CRT Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 DVM Digital Voltmeter 15 50 ohm bnc cable 1 required 3 Ramp Generator 1 required B1 CRT PRELIMINARY SETUP Position the trace to the center vertical graticule line a Perform the Performance Check Power Up Sequence given at the beginning of Part I Performance Check b CHECK That the vertical trace is aligned with the center vertical graticule li
26. Tektronix Inc P O Box 500 Beaverton Oregon MANUAL PART NO 070 2821 00 97077 COMMITTED TO EXCELLENCE CHANGE INFORMATION atthe Rear of this Manual 6B MONITOR WITH OPTIONS SERVICE MANUAL First Printing SEP 1979 Revised JAN 1981 This equipment gecierate renergy and tay cause ji installedsand used in aceorc hascbeen tested and found to With the limits for Class B computing devices pursuant to Subpart Jof Part 15 of FCC Rules k 3 Which are designed t provide protection against such cinterference when this equipment is operated in a commercial environment Operation iri a residentiaf areais likely to cause interference in which case the users at their own expense must take whatever measures may be required to correct the 7 interference E an radiate radio frequency adio communications if not instruction manual It Copyright 4979 Tektr hix he All rights reserved Zontents ofthis publication nd not be inany TEKTRONIX scope MOBILE and are reg istered trademarks of Tektronix Inc TELEQUIPMENT is registered trademai Bktronix U K Limited Printed in USA Specification and price change privileges are feserved NI 6068 Service TABLE OF CONTENTS PAGE LIST OF ILLUSTRATIONS DYNAMIC FOCUS eden 3 6 LIST OF TABLES X ABSOLU
27. The 5X position of each attenuator is a frequency compensated voltage divider These step attenuators are set in the 1X position when shipped from the factory A jumper is provided on each input line to allow selection of either 1 MQ or 50 input impedance Both jumpers P201 P205 should normally be in the same position for proper circuit operation Stray signal pickup and cross coupling are prevented by the use of grounding caps on the unused inputs When the ALTERNATE INPUTS connector is used the grounding cap is installed on the Y INPUT Y PREAMPLIFIER The Y Preamplifier is a differential amplifier employing two identical and inverting feedback amplifiers The feedback amplifiers consisting of Q220A Q230 0240 and 02208 0235 0245 supply the push pull voltage required to drive the Y Output Amplifier Field effect transistor Q220 provides high input impedance and temperature stability The FET gates are diode clamped on the negative going overdrive signals to protect the field effect transistors from excessive input voltages 3 4 The Y Gain adjust R229 allows settling the 8 cm deflection from 0 5 volts to at least 2 5 volts 12 5 volts with attenuator switches S200 and S205 in the 5X position Front panel control R56 provides vertical positioning by differentially altering the bias voltage on the base elements of Q250 and Q255 Transistors Q250 and Q255 function as a differential current source for the push pull
28. Z AXIS 6 5 47 1 Z Axis Amplifier Preliminary Setup 5 47 2 Adjust Z Axis Gain R124 5 47 3 Adjust Z Axis Compensation R239 And C285 And Check Aberrations 5 48 4 Check Z Axis Amplifier Bandwidth 5 49 5 Check Z Axis Common Mode Rejection 5 49 6 Check Z Axis Blanking 5 50 DYNAMIC FOCUS 0 0 cece cece nne 5 51 1 Dynamic Focus Preliminary Setup 5 51 2 Adjust Bias 9306 5 51 3 Adjust Focus And Stigmators With Dot Generator eee xe ner ee 5 52 4 Adjust Focus And Stigmators Without Dot Generator eee 5 Check Spot Diameter REV A MAY 1980 ADJUSTMENT AND PERFORMANCE CHECK POWER UP SEQUENCE NOTE The performance of this instrument can be checked at any ambient temperature from 0 to 50 C unless otherwise stated Adjustments must be performed at an ambient temperature from 15 to 25 C for specified accuracies 1 Remove any cabinet panels to gain access to the internal controls selectors and test points 2 Check that the internal Line Voltage Selector plug has been set to the appropriate line voltage and range See Fig 1 1 of Section 1 General Information 3 Check the rear panel to determine which options have been installed in your Monitor 4 Check that grounding caps are on the INPUTSs Calibration Part l1
29. board removal 6 Unsolder the 2 leads behind the Voltage Selector Plug and the 4 leads 2 black and 2 red that come to the board from the transformer 7 Remove the remaining 6 Harmonica connectors 8 Remove 5 Board Mounting Screws 9 Pry up on the board near the interboard connectors 2 while guiding the two heat sinks from their slots See step 3 10 Remove the board 11 To install the board reverse the removal procedure 4 12 4 Converter Board Remove the Converter board as follows refer to Fig 4 8 1 Follow the procedure for the High Voltage board removal delete step 7 then proceed with the following instructions 2 Remove the 2 transitor Spring Clips Retain the white Insulating Chips 2 located between the transistors and the chassis 3 Unplug the 2 single Harmonica connectors 4 Remove 8 board mounting screws 5 Pry up on the board near the Interboard Connector REV A MAY 1980 Maintenance 606B HARMONICA SPRING INSULATING CLIPS 2 CHIPS 2 2119 REMOVE ga SCREWS J rere enews e amp 4 INTERBOARD CONVERTER CONNECTOR BOARD 2821 21 Figure 4 8 A4 Converter board removal INTERBOARD 01 yt CONNECTOR CAPACITOR REMOVE SCREWS 3 5 HIGH VOLTAGE BOARD 2821 22 Figure 4 9 A5 High Voltage board removal 4 13 Maintenance 606B 6 Rem
30. connector J50 2 the Z INPUT inverting bnc connector J60 and 3 the ALTERNATE INPUTS noninverting cannon connector J25 Signals can be applied to any Z input connector as a single ended input or to either noninverting Z input J50 or J25 and the Z iNPUT inverting for a differential input Refer to Figure 2 3 in Section 2 Operating Instructions for J25 ALTERNATE INPUTS connector pin assignments A jumper is provided on each input line to allow selection of either 1 MQ or 50 Q input impedance Both jumpers P102 P106 should normally be in the same position for proper circuit operation Stray signal pickup and cross coupling are prevented by the use of grounding caps on the unused inputs When the ALTERNATE INPUTS connector is used the grounding cap is installed on the Z INPUT Z PREAMPLIFIER The Z Preamplifier is a differential amplifier employing two identical and inverting feedback amplifiers The feedback amplifiers consisting of Q120A Q130 Q140 and Q120B 0135 0145 supply the push pull voltage required to drive the Z Output Amplifier Field effect transistor Q120 provides high input impedance and temperature stability Theory of Operation 606B The FET gates are diode clamped on the negative going overdrive signals to protect the field effect transistors from excessive input voltages Front panel control R46 provides intensity control by differentially altering the bias voltage on the base elements o
31. corner focus may be further improved by slight compromises of edge S2 adjustments nn Turn off the 6068 POWER oo Move P398 Defocus jumper to position A Turn on the 6068 POWER pp ADJUST R76 Focus front panel for roundest center dot qq Connect the Test Oscilloscope to TP280 Z Axis output rr Set the Dot Generator Amplitude to 1 V and adjust the 606B INTENSITY for 70 V at TP280 ss ADJUST R455 2 Focus for roundest dot tt Turn off the 606B POWER and move P398 Defocus jumper to position B CAUTION an n aan as Always turn off the 606B POWER before turning off the Dot Generator The INTENSITY contro may be set to a level that will cause burning of the crt phosphor when the display is a single stationary dot REV A MAY 1980 Caiibration Part lI C 606B Adjustment and Performance Check F4 ADJUST FOCUS AND STIGMATORS WITHOUT DOT GENERATOR NOTE Perform Step then proceed See Step to Adjust Focus and Stigmators With Dot Generator F4 SETUP CONDITIONS 606 Controis INTENSITY FOCUS dim dot Midrange 606B Monitor Test Equipment Controis none a Turn off the 606B POWER b Locate the Defocus jumper P398 and check that it is in position B Turn on the 606B POWER c Set the INTENSITY for a barely visible dot and position it to center screen d Set the FOCUS R76 front panel to midrange NOTE For optimum performance a hand magnifier of at
32. display c Slowly increase the Sine Wave Generator output frequency until the display amplitude is 4 9 divisions on the test Oscilloscope d CHECK That the Sine Wave Generator frequency is at least 5 megahertz output 5 24 E4 CHECK Z AXIS COMMON MODE REJECTION NOTE if the preceding step was not performed first perform step Et then proceed E4 SETUP CONDITIONS 6068 Controls Z Axis Gain internal 1 volt full intensity See Step 2 50Q Terminator Test Oscillo scope Dual Input Coupler Function Generator Vertical Input Sine Wave Out bnc Cable 10X Probe Test Equipment Controls Function Generator Function Sine wave Frequency Amplitude Test Oscilioscope Deflection Factor Input Coupling Triggering Sweep Rate Internal ese fms 2821 47 2821 87 NOTE Verify that the Z Axis Gain is set for 1 volt full intensity before performing this step Input Impedance Selecting jumpers P102 P106 are in the 1 MQ position as shipped from the factory a Connect the 10X probe from TP280 to the vertical input of the test Oscilloscope b CHECK The test Oscilloscope for 3 5 divisions 3 5 V or less e E5 CHECK Z AXIS BLANKING NOTE If the preceding step was not performed first perform step 1 then proceed E5 SETUP CONDITIONS 6068 Controls Make no changes to the control settings
33. for which the Monitor was not set when shipped from the factory is clipped to the Low Voltage Power amp Z Axis board see Fig 1 1 IE REV A MAY 1980 CB the attenuator switches General Information 606B E Change the voltage range indicating screw to the appropriate hole in the line voltage information chart on the 606B rear panel 5 Apply power to the Monitor INSTALLATION IN PATIENT CARE M ITA E FACILITIES WARNING Do not use the amplifier INPUTS for direct Datient connection Signal currents at these connectors as well as leakage currents may exceed values considered nonhazardous for direct patient connection Although this Monitor is not to be connected directly to a patient interconnecting this Monitor to ether equipment can result in the application of excessive current to a patient It is extremely important that the interconnection is made in accordance with NFPA 768 5 Tentative Standard for the Sate Use of Electricity in Patient Care Areas of Health Care Facilities section 3038 Signal Transmission Between Appliances Among the situations involving the above mentioned patient hazard is one in which two or more pieces of interconnected equipment are grounded at locations r mote from one another The standard mentioned in the preceding warning describes both this hazard and the iate corrective measures INPUT ATTENUATION 1 The
34. off the 606B POWER i Remove the test leads from the Monitor and replace the rear cover and the high voltage shield Calibration Part 11 6068 Adjustment and Performance Check B CRT Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 DVM Digital Voltmeter 3 Ramp Generator 2 required 15 50 ohm bnc cable B1 CRT PRELIMINARY SETUP a Perform the Adjustment and Performance Check Power Up Sequence given at the beginning of Part 11 Adjustment and Performance Check b Refer to Section 6 Instrument Options and the Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board Illustrations d Set 606B controls INTENSITY seo Ee TUS Visible display Vertical and Horizontal Position Midrange FOCUS c enticed ent heros Well defined display B2 ADJUST CRT GRID BIAS R245 NOTE First perform Step B1 then proceed B2 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 6068 Monitor Test Leads Test Equipment Controls DVM Digital Voltmeter Range Function 2821 55 a Position the sharply focused dot display near graticule center b Rotate the INTENSITY control counter clockwise till the dot just disappears c Connect the DVM be
35. or other information is to be found AS MARKED ON EQUIPMENT 4 DANGER voltage Protective ground earth terminal A ATTENTION refer to manual WARNINGS POWER SOURCE This product is intended to operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation GROUNDING THE PRODUCT This product is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired receptacle before connecting to the product input or output terminals protective ground connection by way of the grounding conductor in the power cord is essential for safe operation iv e 606 Service USE THE PROPER POWER CORD Use only the power cord and connector specified for your product Use only a power cord that is in good condition Ay For detailed information on power cords and connectors see th Operating Power Information in Section 1 General information DANGER ARISING FROM LOSS OF GROUND m Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating can render an electric shock USE THE PROPER FUSE i To avoid fire hazard use only the fuse specified in the par
36. output of the Y Preamplifier SCAN LIMITER Transistors Q280 Q285 and diodes CR280 CR285 prevent overdriving the Y Output Amplifier by limiting the Y Preamplifier signals to within about 5 volts of each other Y FOCUS CORRECTION PICKOFF Samples of the Y and Y signals are coupled from the Y Preamplifier to the Y Absolute Value Amplifier diagram 4 for focus correction in the Y axis A sampling of the Y voltage signal is converted to a current signal by Q270 and the voltage signal by Q275 before being applied to the Y Absolute Value Amplifier Y OUTPUT AMPLIFIER The Y Output Amplifier consists of two identical and noninverting operational amplifiers connected in a differential configuration For ease of explanation only the side will be discussed Transistors 0200 0220 0230 0240 0250 0260 0270 and Q280 are the active components of the Y operational amplifier Feedback is provided through R274 and C274 to the emitter of Q200 Transistor O215 provides additional emitter current to Q200 This current determines the dc voltage output level The signal from the Y Preamplifier stage is amplified by Q200 and fed through emitter followers 0220 0230 to a cascode driver Q240 Complimentary amplifiers Q250 Q260 provide the final gain for the Y Output Amplifier signals with emitter followers Q270 Q280 supplying the high current to drive the capacitive load of the crt plates The capacitance between the mounting tabs of
37. proceed D2 SETUP CONDITIONS 5068 Controls Make no changes to the control settings 606 Rear Panel Ramp Generator Q Ramp Out bnc Cable Test Equipment Controls Ramp Generator Ramp Signal Triggering Amplitude deflection 2821 56 2821 70 a CHECK Rotate the vertical Position control and check that the horizontal trace can be positioned vertically anywhere in the graticule area b Reduce the Ramp Generator Amplitude to provide 8 div deflection on the 606B c Disconnect the Ramp Generator from the X INPUT and apply it to the test Oscilloscope vertical input Set Volts Div switch to 1 V position with 10X probe d CHECK For a Oscilloscope 1 division display on the test 5 19 Calibration Part i 606B Performance Check D3 CHECK VERTICAL SETTLING TIME NOTE if the preceding step was not performed first perform step D1 then proceed D3 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear Panel bne Cables Test Equipment Controls Ramp Generator Duration Triggering tAUTO Ext set for 10 div deflection Amplitude Calibration Generator fast rise 10 ys 100 kHz 2821 39 2821 80 Period a Rotate the Var Period contro Calibration Generator until 1 full cycle is displayed on the crt b CHECK That the time required for the leading edge of the square wave
38. test leads Measurement range 5450V to 5350V Check adjust 5400 V supply a Triplett Model 630 NA b Simpson Model 262 3 Ramp Generator 2 required Ramp duration 5 ms to 100 us within 3 ramp amplitude 0 5 to 2 V into 1 MQ external trigger input compatible with square wave gen erator trigger output gate output 1 to 3 V into 1 Adiust gain and comp ensation of the vertical horizontal and Z axis amplifiers Check vertical and horizontal bandwidth common mode rejection and settling time Check vertical and horizontal positioning Adjust TRACE ALIGN and geometry Check Orthogonality and Waveforms for Dynamic focus circuit a TEKTRONIX RG 501 Ramp Generator operates in TM 500 series power module 4 Calibration Gen erator Square wave Generator Amplitude Calibrator Mode Frequency approx 1 kHz amplitude 0 5V to 10V into 2 MQ within 0 25 Pulse Mode High Amplitude Output Freq 1 kHz to 100 kHz amplitude 0 5V to 10V into 50 risetime 10 ns or less into 50 Adjust gain and comp ensation of the vertical horizontal and Z axis amplifiers Check vertical and horizontal settling time Check and adjust vertical and horizontal input attenuators a TEKTRONIX PG 506 Calibration Generator operates in TM 500 series power module REV A MAY 1980 5 9 Calibration 606B TABLE 5 3 CONT Test Equipment Descript
39. the Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board illustrations d Set 606B controis INTENSITY ENEKE SAE Visible display Vertical and Horizontal PoSItIOD eene ie eret eee Position the dot to center screen within O 2 division F2 CHECK SPOT DIAMETER NOTE Perform step F1 then proceed 5 26 F2 SETUP CONDITIONS 606B Controls INTENSITY debis fully counterclockwise bnc Cable Ramp Generator A 6068 Rear ORamp Out Gate Out bnc Cables 3 gt Ramp Generator B Ramp Out Dual input ler Couple O Gate Out bnc Cables Counter Test Equipment Controls Ramp Generator A Ramp Signal 100 us Triggering M AUTO eme provide approx 1 inch deflection Ramp Generator B Ramp Signal 10 ms Triggering norm Ext Amplitude provide approx 1 inch deflection Counter COUDIIBg vaca Era rasta Fa a AC Ratio averaged over 10 cycles of 8 Slope ere ors eats agen sarees ies Slope DVM Digital Voltmeter Range Function i Function 20 V dc 2821 58 2821 76 a
40. the graticule Then reconnect the Ramp Generator to the Y INPUT and repeat step B4 until optimum geometry is achieved Calibration Part 6068 Adjustment and Performance Check C HORIZONTAL X AMPLIFIER Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 Digital Voltmeter DVM 3 Ramp Generator 4 Calibration Generator 5 Sine Wave Generator 10 Function Generator 11 Dual Input Coupier 15 bnc cables 3 required 21 9X Magnifier C1 HORIZONTAL X AMPLIFIER PRELIMINARY SETUP a Perform the Adjustment and Performance Check Power Up Sequence given at the beginning of Part il Adjustment and Performance Check b Refer to Section 6 Instrument Options and the Change information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board illustrations d Set 6068 Controls INTENSITY rr pobres Visible display Vertical and Horizontal Position Midrange FOCUS ceo ecce etas Weil defined display C2 ADJUST X OUTPUT DC LEVEL NOTE Perform step C1 then proceed C2 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 6068 Monitor Test Equipment Controis DVM Digital Voltmeter Range Function 2821 30 a Position the display to graticule c
41. then combined and fed to the Stigmator 1 Output Amplifier and Level Shifter through a level shifter Q300 For reference in this description assume the crt beam is deflected to the upper left quadrant of the screen X O Y gt O The voltage at the collector of Q100 X Absolute Value Amplifier is greater than the clamp voltage 45 5 volts while the voltage at the collector of Q110 is clamped to 5 5 volts by CR110 Similarly the output of Q120 Y Absolute Value Amplifier is active while the voltage at the collector of Q130 is clamped to 5 5 volts by CR130 The output from Q100 is applied to U150 pin 9 through R152 Top Left S1 and to U160 pin 12 through R161 Bottom Left S1 The output from Q120 is applied directly to U150 pin 8 Looking at U150 the difference in the signal at pin 8 amptitude determined by the location of the trace in the Y axis and the 5 5 volts on pin 4 is multiplied 0150 by the signal present at pin 9 At U160 the signal at pin 12 is multiplied in U160 by the signal at pin 8 The signal at pin 8 however comes from the output of Q130 which is presently clamped Therefore the product is zero and there is no change in the current at U160 pin 14 The outputs at pin 14 of U150 and U160 are fed through a current to voltage converter Q300 to the Stigmator 1 Output Amplifier and Level Shifter The Bias control R306 is provided to center the output of the Stigmator 1 Output Amplifier and Level Shifter
42. voltage drop across R390 increases enough to forward bias CR385 This increases the conduction of Q380 which then reduces the conduction of O390 to limit the supply current to a safe level Fuse F320 provides circuit protection in the event of an overload long term or regulator malfunction D INTERCONNECTIONS Diagram 7 shows the six circuit boards in the Monitor and the source and destination schematic number of all signals and voltages applied to each pin 3 11 Section 4 606B MAINTENANCE This section of the manual contains information for performing preventive maintenance troubleshooting and corrective maintenance for the 606B Monitor PREVENTIVE MAINTENANCE Preventive maintenance when performed on a regular basis can prevent or forestall instrument breakdown and may improve the reliability of the instrument The severity of the environment to which the instrument is subjected will determine the frequency of maintenance A convenient time to perform preventive maintenance is preceding electrical adjustment of the instrument VISUAL INSPECTION The 606B Monitor should be inspected occasionally for such defects as broken connections improperly seated semiconductors damaged or improperly installed circuit boards and heat damaged parts The corrective procedure for most visible defects is obvious however particular care must be taken if heat damaged parts are found Overheating usually indicates other trouble
43. 068 Controls Make no changes to the control settings 606B Rear Ramp Generator Sine Wave Generator Ramp Out O U bnc Cables Test Equipment Controls Ramp Generator Ramp Signal 10 msec Triggering Amplitude Set for 8 div deflection Sine Wave Generator Frequency K 50 kHz Amplitude Set for 8 div deflection p a Slowly increase the Sine Wave Generator output frequency until the display amplitude is 5 6 divisions 2821 34 b CHECK That the Sine Wave Generator frequency is at least 3 MHz C7 ADJUST HORIZONTAL X ATTENUATOR COMPENSATION C103 C107 AND CHECK HORIZONTAL INPUT ATTENUATION NOTE If the preceding step was not performed first perform step C1 then proceed Before performing the following procedure set the Horizontal X Amplifier sensitivity 6068 for 1 V 8cm deflection See Step C7 SETUP CONDITIONS 606B Controls Make no changes to the control settings 6068 Rear bnc Cables a Ramp Generator Calibration Generator Ramp High Ampl Output Dual input Coupier Test Equipment Controls Ramp Generator Duration 10 ms Triggering AUTO Ext Calibration Generator Output cic cas Std Ampl sui MD 10v 0 1 ms 10 kHz 2821 35 NOTE In this step the test oscilloscope is used as
44. 20 V AC ANSI C73 20 PAS C112 BS 1363 5CEE 7 sheets IV VI and VII NEMA 6 15 P ANSI American National Standard Institute 2 National Electrical Manufacturer s Association AS Standards Association of Australia BS British Standards Institution CEE International Commission on Rules for the Approval of Electrical Equipment For medical dental applications use NEMA 5 15 P Hospital Grade plug for 120 volt operation or NEMA 6 15 P plug for 220 voit operation line Voltage and Regulating Range Selection Pu Damage to the instrument may result from incorrect placement of the line voltage selector plug See Ambient Temperature Considerations page 2 1 To select the correct nominal line voltage and regulating range proceed as follows 1 Disconnect the instrument from the power source 2 Insert the proper line voltage selector plug the brawn plug for 120 volt operation or the red plug for 220 volt operation on the line voltage selector pins located n the Low Voltage Power amp Z Axis board labeled for the desired nominal line voltage range Refer to Figure 1 1 for location and additional information 3 Remove the line fuse from the fuse holder and check for the correct rating Replace it with one having the correct rating if necessary Refer to Figure 1 1 for fuse information and location NOTE An alternate line fuse intended for the line voltage source
45. 2821 57 2821 71 a CHECK Rotate the horizontal Position control and check that the vertical trace can be positioned horizontally anywhere in the graticule area b Disconnect the Ramp Generator for the Y INPUT and apply the ramp to the test Oscilloscope vertical input Set Volts Div switch to 1 V position with 10X probe c CHECK For a Oscilloscope 1 division display on the test 5 15 Calibration Part 606B Performance Check C3 CHECK HORIZONTAL SETTLING TIME NOTE If the preceding step was not performed first perform step then proceed C3 SETUP CONDITIONS 6068 Controls Make no changes to the contro settings 606B Rear Calibration Generator Fast Rise Out bnc Cables Test Equipment Controls Ramp Generator Duration Triggering Amplitude 2e 10 AUTO Ext Set for 8 div deflection Calibration Generator Output fast rise 10 ps 100 kHz 12821 33 2821 76 a Rotate the Var Period control Calibration Generator until 1 full cycle is displayed on the crt b CHECK that the time required for the leading edge of the square wave to travel from the zero percent level to the 100 percent level see Fig 5 1 is 500 ns 0 4 div or less within a trace width 0 008 cm 096 100 epg TIME 2531 58 Figure 5 1 Typical crt display for horizontal settling time measurement 5 16
46. ATTEN to the 1X forward position Turn on the 606B POWER D8 CHECK PHASING NOTE If the preceding step was not performed first perform step D1 then proceed D8 SETUP CONDITIONS 6068 Controls Make no changes to the controi settings Dual input Coupier 6068 Rear bnc Cable Sine Wave Generator Output O Test Equipment Controls Sine Wave Generator Frequency Ampiitude 2821 43 a Center the display within the graticule area b CHECK That the diameter of the displayed ellipse measured vertically at the center of the graticule is O 1 division or less 5 46 Calibration Part 1 606B Adjustment and Performance Check NOTE The following procedure sets Z Axis Amplifier Gain for full intensity range from a 1 volt input This procedure can be repeated for any voltage up to 5 volts to provide the desired intensity control range a Set the Calibration Generator Pulse Amplitude for 1 volt as indicated on the test Oscilloscope b Disconnect the 1 volt square wave from the test oscillosocpe c Connect a 10X probe from the test Oscilloscope vertical input to TP280 606B Set the test Oscilloscope for dc input coupling end a deflection factor of 20 volts div with the 10X probe d Set the INTENSITY control so that the trace on the 606B just disappears e Note the dc level on the test Oscilloscope denotes Z Axis cutoff level f Connect the
47. Check h Turn on the 6068 POWER i Repeat part c and d then increase the Function Generator output to 15 volts p p j Repeat part e 5 18 CHECK For 0 6 division or less of free running horizontal display on the 6068 position as necessary 1 Turn off the 6068 POWER Return S100 X Atten and 105 X Atten to the 1X forward position m Change the input impedance to 50 Q Calibration Part 1 606B Performance Check D VERTICAL Y AMPLIFIER 3 Ramp Generator 4 Calibrator Generator 5 Sine Wave Generator 9 Test Oscilloscope with 10X probe Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 10 Function Generator 11 Dual Input Coupler 1 required 15 bnc cables 3 required D1 VERTICAL Y AMPLIFIER PRELIMINARY SETUP a Perform the Performance Check Power Up Sequence given at the beginning of Part I Performance Check b Refer to Section 6 Instrument Options and the Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board lilustrations d Set 6068 controls INTENSITY sc ovre dk Hee Visible display Vertical and Horizontal Position Midrange FOCUS oce vus Well defined display D2 CHECK POSITIONING AND GAIN NOTE Perform step D1 then
48. Checkout procedure a TEKTRONIX part 011 0060 02 14 10X Attenuator 10X 500 2 W Check Z axis blanking a TEKTRONIX part 011 0059 02 15 50 ohm cables Impedance 50 Q Provide signal inter a TEKTRONIX part 4 required length 42 inches connection 012 0057 01 connectors bnc en 16 Screwdriver 3 32 inch bit Front panel screwdriver adjustments a XCELITE R3323 17 Low capaci tance Screwdriver Double blade 3 64 and 7 64 inch Total length 4 3 8 inches Adjust variable capaci tors and internal variable resistors a TEKTRONIX part 003 0675 01 18 Screwdriver 7 32 inch bit Adjust internal variable a TEKTRONIX part insulated with resistors 003 0000 00 metal tip b TEKTRONIX part 003 0374 00 i 19 T Connector Connectors bnc to bnc Checkout procedure a TEKTRONIX part 103 0030 00 20 Variable AC Power Supply 90 V to 120 V Adjust Freq R124 a General Radio W8MT3VM Variac Autotransformer 21 9X Magnifier 5X to 10X magnifi cation Adjust X and Y amplifier compensation settling time Adjust stigmators a Edmund Scientific Co mode no 30224 9X Magnifier 22 24X Magnifier 15X to 30X magnifi cation Check spot diameter a Southern Precision model no 1836 6X used with aux 4X eyepiece Comes standard with 10X eyepiece REV A MAY 1980 5 11 Calibration Part
49. Drawing LIST OF TABLES TABLE PAGE 1 Power C rd Conductor Identification 1 2 2 Location of Power Cord Configuration Information seu tre peer rera RE Henn Electrical Characteristics Environmental Characteristics Physical Characteristics Low Voltage Supply Limits Calibration Procedure Electives Performance Check Summary Test Equipment Low Voltage Supply Limits Option Information Locator 6 1 Onan pa zu REV JAN 1982 606 Service SAFETY SUMMARY The general safety information contained in this summary is for servicing personnel Specific warnings and cautions will be found throughout the manual where mey apply but may not appear in this summary TERMS IN THIS MANUAL CAUTION statements identify conditions or practices th d result in damage to the equipment or other property WARNING statements identify conditions or practic s tth t co ld result in personal injury or loss of life AS MARKED ON EQUIPMENT CAUTION indicates a person l injury hazard not AERIS IM accessibla as one reads the marking or a hazard to property including the equipment itself ate Bap DANGER indicates a personal injury hazard immedi t h accessible as one reads the marking IN THIS MANUAL Static Sensitive Devices symbol indicates where applicable cautionary
50. E First perform step A1 then proceed A2 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 6068 Monitor Test Equipment Controls DVM Digital Voltmeter Range Function 2821 49 5 30 a Connect the DVM test leads between the 15 V test point TP352 and ground TP353 b EXAMINE For a voltage reading within the range given in Table 5 4 c ADJUST R337 for a voltmeter reading of exactly 15 0 V dc A3 EXAMINE 15 V SUPPLY NOTE If the preceding step was not performed first perform step Al then proceed A3 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Monitor Test Equipment Controls DVM Digital Voltmeter Range Function ss aiis sjari andien 20 V dc 2821 50 a Connect the DVM between the 15 V test point TP354 and ground TP353 b EXAMINE For a voltage reading within the range given in Table 5 4 TABLE 5 4 Low Voltage Supply Limits I Supply Test limits Ripple dc Point Volts dc 15V TP352 14 95 to 2mV 15 05 or less 15V TP354 15 2 to 2 mV 14 8 or less f 95 V TP351 940t0 100mV 98 0 or less 250 V TP350 249 to 150 mV 251 or less 1 4 ADJUST 250 V SUPPLY NOTE If the preceding step was not performed first perform step A1 then proceed A4 SETUP CONDITIONS 6068 Controis Make no changes to the control settings 6068 Monitor Test Equipment Con
51. G LOW VOLTAGE POWER SUPPLY e Z AXIS AMPLIFIER e HIGH VOLTAGE _OPERATING VOLTAGES POWER SUPPLY TO ALL CIRCUITS Figure 3 1 606B Monitor Block Diagram 3 2 HORIZONTAL DEFLECTION PLATES VERTICAL DEFLECTION PLATES FOCUS INTENSITY GRID 5400 V CATHODE 2821 144 REV A MAY 1980 Signals can be applied to any X input connector as single ended input or to either noninverting X input J10 J25 and the X INPUT inverting for a differential input Refer to Figure 2 3 in Section 2 Operating information for J25 ALTERNATE INPUTS connector pin assignments Internal switches S100 and S105 allow selection of either 1X or 5X attenuation of the input signal before it is applied to the X Preamplifer The 5X position of each attenuator is a frequency compensated voltage divider These step attenuators are set in the 1X position when shipped from the factory A jumper is provided on each input line to allow selection of either 1 or 50 input impedance Both jumpers P101 P105 should normally be in the same position for proper circuit operation Stray signal pickup and cross coupling are prevented by the use of grounding caps on the unused inputs When the ALTERNATE INPUTS connector is used the grounding cap is installed on the X INPUT X PREAMPLIFIER The X Preamplifier is a differential amplifier employing two identical and inverting feedback amplifiers The f
52. HECK That the vertical trace is aligned with the center vertical graticule line at the top and bottom of the graticule within O 1 division 5 34 B4 CHECK ADJUST GEOMETRY R185 NOTE If the preceding step was not performed first perform Step B1 then proceed B4 SETUP CONDITIONS 6068 Controls Make no changes to the control settings Ramp Generator 6068 Rear O Ramp Out bnc Cable Test Equipment Controls Ramp Generator Ramp Signal 5 ms TrOgeFiBg AUTO Amplitude provide 8 divs deflection 2821 57 a Position the trace to the left edge of the graticule and then to the right edge b CHECK the vertical trace for 0 1 division or less of bowing at the left and right edges of the graticule ADJUST R185 Geometry for minimum trace bowing at the left and right edges of the graticule d Disconnect the Ramp Generator from the Y INPUT and connect it to the X INPUT Horizontally center the display on the graticule increase the Ramp Amplitude Ramp Generator to provide full screen width 10 division deflection e Position the horizontal trace to the top edge of the graticule and then to the bottom edge f CHECK The horizontal trace for 0 1 division or less of bowing at the top and bottom edges of the graticule g INTERACTION If necessary readjust R185 Geometry for minimum trace bowing at the top and bottom edges of
53. Horizontal X and Vertical Y Amplifiers include selectable 1X 5X step attenuators in both the non inverting and the inverting input circuits These attenuators extend the deflection factor range of the appropriate amplifi r to at least 12 5 volts for 8 cm signal on Refer to the Internal Control and Selector ocations foldout page in Section 8 Diagrams and Circuit Board Ill strations for the position settings and locations To maintain proper differential operation of the amplifier always change both the and attenuators to the same settings These step attenuators are set in the 1X position when shipped from the factory NOTE Settling Time specifications Table 1 1 General Information are guaranteed only when using the attenuator position w General Information 606B F301 H 250 V Supply F320 0 15A 250V AFTER SN B010130 15 V REG 325 18 V UNREG F310 18 V UNREG F315 p 15 V REG exu uec z cm c c as co os f 110 V Nominal ALTERNATE 5 LINE FUSE 220 V Nominal ALTERNATE ADN VOLTAGE SELECTOR PLUG STORED 412 3 415 6178 LOW VOLTAGE V POWER amp Z AXIS BOARD Regulating Range Data Line Voltage 7 DS 1 Selector Position 110 Volts Nominal 220 Volts Nominal Fuse Data R M M B
54. Move the dot to the bottom center edge of screen aa ADJUST R435 bottom focus for roundest dot bb Turn off the 606B POWER and move P398 Defocus jumper to position B cc Turn on the 606B POWER dd Turn the FOCUS R76 front panel fully counter clockwise to defocus the dot ee Move the dot to the the top corner of the 7 x 9 quality area ff ADJUST R151 top right S1 for roundest dot gg Move the dot in turn to each of the other three corners hh ADJUST R152 Top left S1 R161 bottom left 51 and R162 bottom right 51 for roundest dot in their respective corners 5 54 ii At this point corner focus may be further improved by slight compromises of edge S2 adjustments jj Turn off the 606B POWER kk Move P398 Defocus jumper to position A Turn on the 606B POWER ll ADJUST R76 FOCUS front panel for roundest dot mm Connect the Monitor to the appropriate test equipment as illustrated in Figure 5 5 2 FOCUS SETUP 6068 Controls Defocus internal jumper P398 Position B bnc Cable Ramp Generator A 606B Rear Panel O Ramp Out Gate Out bnc Cables 3 Ramp Generator B Ext Trig in Test Equipment Controis Ramp Generator A Ramp Signal ims Triggering AUTO Amplitude e 2 divisions of display Ramp Generator B Ramp Signal Triggering Amplitude 10 ms AUTO Ext 2 divisions of display 2821 62 Figure 5 5
55. NET TO RACKMOUNT CONVERSION Lw ahi Tektronix Part 040 0600 XX Mounts two 6068 Monitors side by side in a standard 19 inch wide rack i The kit comes equipped with a slide out assembly nd Obtain a corrugated cardboard carton with a 275 includes the securing hardware Complete rackmounting pound test strength and having inside dimensions of no instructions are included in each kit UT cUUless than six inches more than the instrument dimensions this allows for cushioning ve and reuse the package in which your 606B Monitor was shipped to you If the original packaging is unfit for suse or is not available repackage the instrument as follows Tektronix Part 040 0601 Mounts 6068 Monitor in a standard 19 inch wide rack The kit is equipped withtasi 4 Surround the instrument with polyethylene sheeting to slide out assembly securing hardware and a blank front 010161 the finish panel to cover the second instrument opening in the rack ae 77 Complete rackmounting instructions are included in each 3 Surround the instrument frame with heavy cardboard kit 7 TmTifboprotective cabinet panels are available to minimize the danger of component damage the packing Tektronix Part 040 0624 XX runde oneTNr 5037 G PRE OM Power Module and one 6068 Monitor to mount side by side standard 19 inch wide instrument tack THe Kit Cushion the i
56. RFORMANCE CHECK POWER UP SEQUENCE 5 29 POWER SUPPLIES B CRT C HORIZONTAL X AMPLIFIER D VERTICAL Y AMPLIFIER E Z AXIS AMPLIFIER F DYNAMIC FOCUS SECTION 6 INSTRUMENT OPTIONS SECTION 7 REPLACEABLE ELECTRICAL PARTS S CTION 8 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS SECTION 8 REPLACEABLE MECHANICAL PARTS CHANGE INFORMATION 606B Service LIST OF ILLUSTRATIONS PAGE FIGURE PAGE FIGURE NO NO de Typical crt display for horizontal settling 506B Feal res o oce c E e vM ERIS vi time measurement eee eee 5 38 1 4 Location of line voltage selector plugs Typical crt display for vertieal settling regulating range pins and fuses time measurement i iiis esses 5 44 1 2 Installing and removing a rackmounted Adjust Focus and Stigmators without ovre Ra a ee Rada y 1 6 Dot Generator wee 1 3 606B Dimensional 1 13 2 1 Front panel controls and indicators Option 07 Position FOCUS and INTENSITY controls are screwdriver 2 2 6068 Rear panel controls and connectors 2 3 Alternate input connector data 3 1 6068 Monitor Block Diagram 3 2 Simplified illustration of geometric defocusing 3 6 4 1 Color code for resistors and capacitors 4 2 Semiconductor lead configuration 4 3 Orientation of multi pin connector holders 4 4 Crt remova
57. STMENT INTERVAL To maintain instrument accuracy check peformance every 1000 hours of operation or every 6 months if used infrequently Before complete adjustment thoroughly clean and inspect this instrument as outlined in the Maintenance section TEKTRONIX FIELD SERVICE Tektronix Field Service Centers and the Factory Service Center provide instrument repair and adjustment services Contact your Tektronix Field Office or representative for further information 5 8 TEST EQUIPMENT REQUIRED The test equipment listed in Table 5 3 is required for a complete Adjustment and Performance Check of the instrument If only a Performance Check is to be performed the items required for Adjustment are not required and are indicated by footnote 1 The remaining test equipment is common to both procedures The specifications for test equipment given in Table 5 3 are the minimum required to meet the performance requirements Detailed operating instructions for test equipment are omitted in these procedures Refer to the test equipment instruction manual if more information is needed SPECIAL FIXTURES Special fixtures are used only where they facilitate instrument adjustment These fixtures are available from Tektronix Inc Order by part number from Tektronix Field Offices or representatives TEST EQUIPMENT ALTERNATIVES All of the listed test equipment is required to completely calibrate this instrument However complete checking or a
58. TE VALUE AMPLIFIER 3 6 SAFETY SUMMARY Y ABSOLUTE VALUE AMPLIFIER 3 6 STIGMATOR 1 CORRECTION SHAPER 3 7 SECTION 1 GENERAL INFORMATION i 7 STIGMATOR 1 OUTPUT AMPLIFIER AND OPERATORS MANUAL EVEL SHIFTER SERVICE MANUAL REMOTE DEFOCUS INSTRUMENT DESCRIPTION STIGMATOR 2 CORRECTION SHAPER INSTALLATION ina AND MIXER X INITIAL INSPECTION 7 STLGMATOR 2 OUTPUT AMPLIFIER AND OPERATING POWER INFORMATION n LEMEL SHIFTER 7 INSTALLATION IN PATIENT CARE FOCUS CORRECTION SHAPER AND MIXER INPUT ATTENUATION 5 17 ZFOCUS CONVERTER ANB HIGH VOLTAGE SUPPLY CABINET TO RACKMOUNT CONVERSION RACKMOUNT TO CABINET CONVERSION CONVERTER OSCILLATOR SLIDE OUT TRACKS 58 53 s ERROR AMPLIFIER REMOVING OR INSTALLING THE CURRENT LIMITER INSTRUMENT CONVERTER BASE DRIVE SLIDE OUT TRACK LUBRICATION CONVERTER OUTPUT INSTRUMENT PACKAGING DEFLECTION VOLTAGE SUPPLIES SPECIFICATION H V STANDARD ACCESSORIES CONTROL GRID DC RESTORER FOCUS ELEMENT DC RESTORER LOW VOLTAGE POWER SUPPLY POWER RECTIFIER AND FILTER 18 VOLT UNREGULATED SUPPLY 18 VOLT UNREG LATED SUPPLY 15 VOLT REGULATED SUPPLY SECTION 2 OPERATING INFORMATION AMBIENT TEMPERATURE CONSIDERATIONS 9 CONTROLS AND CONNECTORS
59. TPUT AMPLIFIER TTL BLANKING 2 CHECK ASSOCIATED EQUIPMENT 3 VISUAL 4 CHECK INSTRUMENT ADJUSTMEN Q Q Q GG Q Q amp AADUN 606 Service TABLE 5 ISOLATE TROUBLE TO A CIRCUIT 6 CHECK VOLTAGES AND WAVEFORMS 7 CHECK INDIVIDUAL COMPONENTS 8 REPAIR AND READJUST THE CIRCUIT CORRECTIVE MAINTENANCE Sail OBTAINING REPLACEMENT PARTS SOLDERING TECHNIQUES i i nu us COMPONENT REMOVAL AND REPEACEMEN CATHODE RAY TUBE REPLACEMENT CIRCUIT BOARD REPLACEMENT SEMICONDUCTORS INTERCONNECTING CIRCUIT BOARD PIN REPLACEMENT END LEAD PIN CONNECTORS SECTION 5 CALIBRATION F USING THESE PROCEDURES a i PERFORMANCE CHECK SUMMARY ADJUSTMENT INTERVAL TEKTRONIX FIELD SERVICE TEST EQUIPMENT REQUIRED SPECIAL FIXTURES TEST EQUIPMENT ALTERNATIVES PART I PERFORMANCE INDEX TO PART PERFORMANCE CHECK PERFORMANCE CHECK POWER UP SEQUENCE A POWER SUPPLIES Y B C HORIZONTAL X AMPLIFIER D VERTICAL Y AMPLIFIER E Z AXIS AMPLIFIER ive e 5 2 DYNAMIC FOCUS scies csse divus PAGE PART 1 AND PERFORMANCE o ie n EE TE 5 28 INDEX TO PART II ADJUSTMENT AND PERFORMANCE CHECK 5 28 ADJUSTMENT AND PE
60. Triggering 4 AUTO Ext Amplitude set for 10 div deflection Calibration Generator Output 4 fast rise Period 10 us 100 kHz 2821 39 a Set the square wave amplitude to provide 8 cm of vertical deflection while centering the display using the vertical Position control b EXAMINE That the area after the front corner is flat within a finely focused trace width 0 003 inch c Set the Ramp Generator to 10 ys d CHECK That the time required for the leading edge of the square wave to travel from the zero percent level to the 100 percent level see Fig 5 4 is 500 ns 0 5 div or less within a trace width 0 008 cm 5 43 Calibration Part 1i 606B Adjustment and Performance Check SETTLING TIME 100 4 j 49 Figure 5 4 Typical crt display for vertical settling time measurement D5 CHECK VERTICAL BANDWIDTH NOTE if the preceding step was not performed first perform step D1 then proceed D5 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 6068 Rear Panet Sine Wave Generator Ramp Generator Output Ramp Out bnc Cables Test quipment Controls Ramp Generator Ramp Signal Triggering Ampiitude Set for 10 div deflection Sine Wave Generator Frequency Amplitude a Set the Sine Wave Generator amplitude for 6 div
61. a minimum amount of test equipment is required If performing the Checkout Procedure reveals improper performance or instrument malfunction check the operation of associated equipment then refer to the Calibration section for repair or adjustment of the instrument High voltage is present inside the instrument Use extreme caution to avoid electric shock hazards whenever the covers are removed TEST EQUIPMENT REQUIRED The following test equipment was used as a basis to write the Checkout procedure Other test equipment which meets these requirements may be substituted When other equipment is substituted the contro settings or set up may need to be altered 2 4 1 Power Module Description TEKTRONIX TM 500 Power Module with one or more plug in compartments Type Used TEKTRONIX TM 501 used with the FG 503 Function Generator 2 Function Generator Description Frequency range one hertz to 50 kilohertz output amplitude one volt peak to peak into 50 ohms waveform output sine wave Type Used TEKTRONIX FG 503 Function Generator used with TM 501 Power Module 3 Cables bne 3 required Description Length 42 inches 1 required 18 inches 2 required connectors bne Type Used Type RG 58 U 50 ohm coaxial Tektronix Part 012 0057 01 42 inch Tektronix Part 012 0076 00 18 inch 4 T Connector Description Connectors bnc to bnc Type Used Bnc to bnc T connector Tektronix Pa
62. al X axis A schematic diagram of the Dynamic Focus circuit is shown in diagram 4 A detailed block diagram showing the major stages of this circuit is superimposed on the schematic diagram with wide shaded lines The stage names given as sub headings in the following discussion can be found in the shaded boxes on diagram 4 Geometric defocusing a contributing factor to overall crt defocusing occurs when the beam is deflected from the crt center The electron beam at center screen is focused for a particular beam length When the beam is deflected either vertically or horizontally the beam length changes However the focusing voltage remains the same As a result the display is defocused appearing larger at the edge of the screen than at crt center see Figure 3 2 The Dynamic Focus circuit varies the voltages to the focus and stigmator elements of the crt depending upon the vertical and horizontal positions of the electron beam Therefore overall focus is improved over the crt display area X ABSOLUTE VALUE AMPLIFIER The differential output current from the X Focus Correction Pickoff diagram 1 is fed through P150 pins 1 2 to the X Absolute Value Amplifier of which Q100 and Q110 are the active components The X Absolute Value Amplifier converts the differential X pickoff current from the X Y Pre Amplifier Board to alternate on outputs when CR100 is on CR110 is off and vice versa This allows implementation of se
63. amp the replacement connector to the lead Some of the pin connectors are grouped and mounted in a plastic holder the overall result is that these connectors are removed and installed as a multi pin connector see Troubleshooting Aids if the individual end lead pin connectors are removed from the plastic holder note the order of the individual wires for correct replacement in the holder 4 15 Section 5 6068 CALIBRATION This section provides procedures for calibrating this instrument These procedures are designed to compare the performance of this instrument with measurement instruments of known accuracy to detect correlate or eliminate by adjustment any variation from the electrical specifications These procedures also verify that the controls function properly This section is divided into two parts Part Performance Check is provided for those who wish to verify that this instrument meets the applicable electrical specifications in section 1 without making internal adjustments Part 11 Adjustment and Performance Check provides a complete calibration procedure that includes adjustments and performance checks in addition to verifying that the controls function properly The procedures in Part i and Part 11 are written so that the entire instrument or any major circuit or part of a circuit can be checked or adjusted Table 5 1 Calibration Procedure Electives lists the choices available and instructions for performing com
64. ator Std Ampl Output to the vertical input of the test Oscilloscpe through a 50 ohm terminator d Set the test Oscilloscope deflection factor Volts Div to 1 V Div Accurately set the test Oscilloscope vertical gain for 5 divisions of deflection Change the Calibration Generator Mode to High Ampl and set the Period control to 1 ms 1 kHz Set the Calibration Generator Pulse Amplitude for exactly five divisions of vertical deflection on the test Oscilloscope position as necessary f Disconnect the Calibration Generator from the test Oscilloscope vertical input and connect it Calibration Generator High Ampl Output through the dual input coupler to the Y INPUT connector on the 606B and the external trigger input on the Ramp Generator g CHECK For 8 divisions of deflection ADJUST C203 Y Atten Comp for optimum square corner i Disconnect the Calibration Generator from the Y NPUT and connect it to the Y INPUT Install the grounding cap on the INPUT j Center the display ADJUST C207 Y Atten Comp for optimum square corner Calibration Part lI 606B Adjustment and Performance Check D7 CHECK VERTICAL Y COMMON MODE REJECTION 1X 5X ATTEN NOTE if the preceding step was not performed first perform step D1 then proceed D7 SETUP CONDITIONS 606B Controis Make no changes to the contro settings Dual Input Coupler 606B Rear Function Generator Ramp
65. below 50 C The reliability and performance of the 6068 will be affected if the ventilation holes in the protective panels are obstructed or if the 606B is operated at an ambient temperature higher than 50 C Other environments and mounting configurations may require additional cooling measures CONTROLS AND CONNECTORS Controls and connectors necessary for operation of the 6068 Monitor are located on the front and rear panels of the instrument To make full use of the capabilities of the 606B the operator should be familiar with the function and use of each external control and connector The front panel controls are shown and described in Figure 2 1 Brief descriptions of the rear panel controls and connectors are given in Figure 2 2 DETAILED OPERATING INFORMATION SIGNAL CONNECTORS The bnc connectors on the rear panel of the standard 6068 Monitor are provided for application of input signals to the vertical Y and horizontal X Amplifiers for display on the crt and to the Z Axis Amplifier to contro the display intensity An additional bnc connector is provided to allow application of TTL compatible input voltages to blank the display The 6068 Monitor also provides a 25 pin male Cannon connector located the rear panel for direct connections to the X Y and Z Axis Amplifiers and the Dynamic Focus Signal requirements are the same as for the bnc inputs See Figure 2 3 for pin assignments NOTE The bnc grounding caps
66. bnc Cables Calibration Generator Ramp Generator O Ramp Out High Ampl Output Dual Input Coupler Test Equipment Controls Ramp Generator Duration Triggering Calibration Generator Output Amplitude Period AUTO Ext Std 0 1 ms 10 kHz 2821 41 2821 82 Set the and Atten switches S200 5205 in the 5X position back Turn on the 606B POWER b CHECK For 8 divisions of deflection Calibration Part 606B Performance Check D6 CHECK VERTICAL Y COMMON MODE REJECTION 1X 5X ATTEN NOTE If the preceding step was not performed first perform step D1 then proceed D6 SETUP CONDITIONS 6068 Controls Dual Input Coupler 6068 Rear Function Generator Ramp Generator Output Q Ramp Out bnc Cables Test Equpment Controls Ramp Generator cco ine tae de erit cta leds an ULL uin lees 10 ms Triggering tAUTO Ext Amplitude set for 10 divs deflection Function Generator Function Sine wave Frequency 500 kHz Amplitude 2 3 V p p 2821 42 2821 83 Move the 50 0 1 Y INPUT Impedance Selecting Jumpers to the 1 MQ position b Turn on the 6068 POWER c Connect the Function Generator output to the test Oscilloscope vertical input Do not terminate d Set the Function Generator controls for a 500 kHz 3 volt p p sinewave as indicated on the test Osci
67. board as previously described however do not unsolder the 8 transistors in step 3 Next proceed with the following instructions Maintenance 606B 3 Unplug the four 2 pin Harmonica connectors 4 Remove 4 mounting screws 5 Separate the interboard connector and pull the board from the instrument 6 To replace the board reverse the preceding removal procedure A3 Low Voltage Power And Z Axis Board Remove the Low Voltage Power and Z Axis board as follows refer to Figure 4 7 1 Unplug the 10 pin Harmonica connectors both ends of the ribbon cable 2 Remove the High Voltage Shield 3 Loosen the 2 screws securing the transistor heat sinks to the chassis 4 Remove 2 Transistors mounted to the chassis by spring clips 5 Remove the Voitage Selector Plug to gain access to the leads behind it REMOVE 4 SCREWS 4 HARMONICAS 2 PIN 055000000 2 X Y PRE AMPLIFIER BOARD 2821 17 Figure 4 6 A2 X Y Pre Amplifier board removal REV A MAY 1980 4 11 606 10 PIN HARMONICA UNPLUG BOTH ENDS HIGH VOLTAGE SHIELD VOLTAGE SELECTOR REMOVE TRANSISTORS 2 PLUG TRANSISTOR HEAT SINK SCREWS e BOARD MOUNTING SCREWS 000000000000000 A3 LOW VOLTAGE POWER amp Z AXIS BOARD 2821 20 Figure 4 7 Low Voltage Power and Z Axis
68. ch circuit board illustration is arranged in a grid locator with an index to facilitate rapid location of components contained in the schematic diagrams TROUBLESHOOTING CHART A troubleshooting chart is given in Section 8 Diagrams and Circuit Board lilustrations to aid in locating a defective circuit The shaded blocks of the Troubleshooting Chart indicate stages which may cause the indicated malfunction The stage names given in shaded blocks correspond directly to the names given in the functional stage blocks of the schematic diagrams The circuits are discussed in detail in Section 3 Theory of Operation TEST POINT AND ADJUSTMENT LOCATIONS To aid in locating test points and adjustable components called out in the Calibration procedure a Test Point and Adjustment Locations foldout page is provided in Section 8 Diagrams and Circuit Board Illustrations 4 2 COMPONENT COLOR CODING The instrument contains brown composition resistors some metal film resistors and some wire wound resistors The resistance values of wire wound resistors are usually printed on the component body The resistance values of composition resistors and metal film resistors are color coded on the components using the EIA color code some metal film resistors may have the value printed on the body The color code is read starting with the stripe nearest the end of the resistor Composition resistors have four stripes which consist of two significant fig
69. ch the subsections and procedures appear is the recommended sequence for a complete performance check or calibration of the instrument The first step in each subsection A1 B1 C1 etc contains reference information and control settings that must be performed before proceeding The Setup Conditions provide equipment connection information and control settings for both this instrument and any associated test equipment Also the Setup Conditions are written so that if desired each subsection A B C etc or step A2 B2 B3 etc can be performed independentiy The terms CHECK EXAMINE ADJUST or INTERACTION when used as the first word of an instruction are defined as follows 1 CHECK indicates the instruction accomplishes an electrical specification check Each electrical specification checked is listed in Table 5 2 Performance Check Summary see the following Performance Check Summary discussion for more information 2 EXAMINE usually precedes an ADJUST instruction and indicates that the instruction determines whether instruction appears in the same step the EXAMINE instruction concerns measurement limits that do not have a related limits following the word interpreted as electrical specifications They are provided as indicators of a adjustment is necessary If no ADJUST adjustment Measurement EXAMINE are not to be properly functioning instrument and to aid in adjustment process 3 ADJUST de
70. connector holders TROUBLESHOOTING EQUIPMENT The following equipment in addition to that listed in the Performance Check and Adjustment section is useful for troubleshooting the 606B Monitor Semiconductor Tester Description Dynamic type tester Purpose To test the semiconductors used in this instrument Recommended Type TEKTRONIX Type 576 Curve Tracer or equivalent Multimeter Description Ten megohm input impedance and O to 300 volts range ac and dc ohmmeter O to 50 megohms Accuracy within 3 Test probes must be insulated to prevent accidental shorting Purpose General troubleshooting Test Oscilloscope Description Frequency response dc to ten megahertz minimum deflection factor one millivolt division to five volts division A 10X ten megohm voltage probe should be used to reduce circuit loading for voltage measurements Purpose To check operating waveforms Maintenance 606B Service Extender Kit Description The 067 0958 00 Service Extender kit consists of all the electrical parts necessary to mount the High Voltage board A5 at a right angle with the Converter board A4 This provides access to the component side of the High Voltage board as well as expose circuitry on the Converter board for troubleshooting purposes TROUBLESHOOTING TECHNIQUES This troubleshooting procedure is arranged in an order that checks the simple trouble possibilities before proceeding with extensive troubleshoot
71. controls INTENSITY icit co ESSI MUR ERES Visible display Vertical and Horizontal Position Midrange FOCUS Well defined display REV A MAY 1980 D2 ADJUST Y AMPLIFIER GAIN R204 R209 R229 AND CHECK POSITIONING NOTE Perform step 01 then proceed D2 SETUP CONDITIONS 6068 Controls Y GAIN R204 fully clockwise Gain R229 internal fully clockwise 606B Rear Panel Calibration Generator Fast Rise Out Test Equipment Contro s Ramp Generator Ramp Signal puna ayer ie case 5 Triggering wees Ext Amplitude set for 10 div deflection Calibration Generator Output fast rise Amplitude 0 28 volt t1 Period 1 msec 1 kHz 2821 374 5 41 Calibration Part 606 Adjustment and Performance Check NOTE NOTE This procedure adjusts all gain set controls R204 R209 R229 for maximum sensitivity of the Vertical Y Amplifier Normally the Output Amplifier Gain R209 will not be adjusted unless the X Y Output Amplifier specified limits 0 5V 8cm to 22 5V 8cm by board has been serviced or the crt has been applying the desired input amplitude and replaced adjusting for appropriate vertical deflection The Vertical system is now adjusted to maximum sensitivity 0 5 V 8cm The internal Y Gain R229 X Y Pre Amplifier board may be readjusted for any deflection fa
72. covery and degradation of settling time Amplitude set for 10 div deflection rmance performants Calibration Generator Output sei esses Hast rise e ADJUST Y GAIN R204 front panel for a crt display Period 10 us 100 kHz of exactly 4 cm of deflection 2821 38 f Disconnect the Calibration Generator from the Monitor NOTE The use of a hand magnifier of at least 5X is g CHECK Rotate the vertical Position control and check that the horizontal trace can be positioned vertically anywhere in the graticule area 5 42 necessary for observing the square wave front corner and flatness The alignment tool must be a low capacitance insulated type Remove the tool from the adjustment screw before determining that the adjustment is optimum The capacitance shield must be in place for the following adjustments REV A MAY 1980 a Set the square wave amplitude to provide 7 5 cm of vertical deflection then center the display using the vertical Position control b Using the front panel FOCUS control adjust the trace for optimum width while observing with the hand magnifier ADJUST C206 HF Comp 1 and R203 HF Comp 3 for optimum bottom leading corner NOTE R203 affects the sharpness of the leading corner Adjust so that the corner and the area just after is flat d Remove the square wave from the Y INPUT and apply it to the Y INPUT Install the grounding cap on the unused input Center the disp
73. ct to earth such as phase to phase on a three wire system is not recommended since only the line conductor has over current fuse protection within the instrument This instrument has a three wire power cord with a polarized two pole three terminal plug for connection to the power source and safety earth The safety earth terminal of the plug is directly connected to the instrument frame For electric shock protection insert i this plug only in a mating outlet with a safety earth contact Do not defeat the grounding connection Any interruption of the grounding connection can create an electric shock hazard Before making external connections to this instrument always ground the instrument first by connecting the power cord to a properly mated power outlet TABLE 1 1 Power Cord Conductor Identification Conductor Color Alternate Color Brown Black Light Blue White Green Yellow Green Yellow i eUngrounded Line Grounded Neutral Grounding Earthing The power cord plug required depends upon the ac input voltage and the country in which the instrument is to be used Should you require a power cord plug other than that supplied with your instrument refer to the standards listed in Table 1 2 TABLE 1 2 Location of Power Cord Configuration Information Nominal Line Voltage Reference Standards 120 V AC ANSI C73 11 NEMA 5 15P Hospital Grade 2
74. ctor within The Calibration Generator output must be set within 1 nominally for the adjustment Check that the nput impedance selecting jumpers P101 P105 are in the 50 Q position Up to 250 V dc at potentially lethal currents D3 ADJUST Y AMPLIFIER COMPENSATION are present at the power transistor tabs and C206 C208 C279 R203 AND EXAMINE SCAN ut other points on the X Y Output Amplifier LIMITER board Use caution when servicing This instrument is factory adjusted for a deflection factor of 1V 8cm within 296 D3 SETUP CONDITIONS a Assure that attenuator switches S200 S205 are in the 1X position and grounding caps are on all unused INPUTS 606B Controls Make no changes to the control settings b Position the display near vertical screen center 606B Rear EXAMINE For a crt display of exactly 4 5 cm amplitude d ADJUST R209 Output Amplifier Gain located on the X Y Output board for a crt display of exactly 4 5 cm Ramp Generator amplitude NOTE This adjustment standardizes the output amplifier gain and must not be used for Trig Out Trig in adjusting deflection sensitivity Altering this bnc Cables adjustment will change HF Compensation and Test Equipment Cones j ji 7 amp Generator misadjustment may cause output amplifier DOO ciones us doc dex v e MAU C E EET NE 100 us saturation resulting poor off screen f Triggering AUTO Ext re
75. ctors The High Voltage and Low Voltage Power Supplies provide all the voltages necessary for operation of this instrument INSTALLATION INITIAL INSPECTION This instrument was inspected both mechanically and electrically before shipment It should be free of mars or scratches and should meet or exceed al electrical specifications To confirm this inspect the instrument for physical damage incurred in transit and test the electrical performance by following the Checkout Procedure Section 2 Operating Instructions Verify performance requirements by referring a qualified service person to the servicing sections of the Service Manual If there is damage or deficiency contact your local Tektronix Field Office or representative OPERATING POWER INFORMATION This instrument can be operated from either a 1 220 volt nominal line voltage source 48 to 440 hertz In addition three regulating ranges are provided for e ch nominal line voltage source gj H CAUTION rer To prevent damage to the instrument always check the line voltage information recorded on the rear panel before applying power to the instrument 1 2 Power Cord Information This instrument is intended to be operated from a single phase earth referenced power source having one current carrying conductor the Neutral Conductor near earth potential Operation from power sources where both current carrying conductors are live with respe
76. d ADJUST Preset HF Comp R239 C285 to midrange Adjust R239 for minimum aberrations and C285 for optimum front corner Use low capacitance screwdriver when adjusting C285 e INTERACTION Repeat adjustments in part d for optimum square corner and minimum aberrations NOTE Changing the adjustment of R239 or C285 may affect the check in E4 Check Z Axis Amplifier Bandwidth E4 CHECK Z AXIS AMPLIFIER BANDWIDTH NOTE If the preceding step was not performed first perform step E1 then proceed E4 SETUP CONDITIONS 6088 Controls Vertical or Horizontal Position fully clockwise Test Oscillo scope bnc Cable Sine Wave Generator Sine Wave Out O Test Equipment Controls Sine Wave Generator FREQUENCY sio TAA E PEE qvo dean ceases Test Oscilloscope Deflection Factor Input Coupling Triggering Sweep Rate 10 us div 2821 46 a Connect a 10X probe from the test Oscilloscope vertical input to TP280 b Set the 606B INTENSITY control and the Sine Wave Generator Amplitude for a 7 division 70 V display on the test Oscilloscope Make sure no clipping occurs on the test Oscilloscope display c Slowly increase the sine wave generator output frequency until the display amplitude is 4 9 divisions on the test Oscilloscope d CHECK That the Sine Wave Generator frequency is at least 5 megahertz output e INTERACTION If the ch
77. d unless the X Y Output Amplifier board has been serviced This instrument is factory adjusted for a or the crt has been replaced deflection factor at 1V 8cm within 2 The Calibration Generator output must be set within 1 nominally for this adjustment Check that input impedance selecting jumpers P101 P105 are in the 50 Q position 5 36 REV A MAY 1980 C4 ADJUST X AMPLIFIER COMPENSATION C106 C108 C179 R103 AND EXAMINE SCAN LIMITER NOTE If the preceding step was not performed first perform step Cl then proceed C4 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear Calibration Generator Fast Rise Out bnc Cables Test Equipment Controls Ramp Generator Duration 100 us Triggering AUTO Ext Amplitude set for 8 div deflection Calibration Generator DUIDUL ccs edet D exo eT ESSA ad fast rise Period 10 us 100 kHz 2821 32 NOTE The use of a hand magnifier of at least 5X is necessary for observing the square wave front corner and flatness The alignment tool must be a low capacitance insulated type Remove the tool from the adjustment screw before determining that the adjustment is optimum The capacitance shield must be in place for the following adjustments a Set the square wave amplitude to provide 7 5 cm of horizontal deflection then center the display using the horizontal Position control b Us
78. djusting may not always be necessary or desirable You may be satisfied with checking only selected characteristics thereby reducing the amount of test equipment actually required Calibration 606B The calibration procedures in Part and Part Il are based on the first item of equipment given as an example When other equipment is substituted control settings or setups may need to be altered If the exact item of equipment given as an example in Table 5 3 is not available first check the Minimum Specifications column carefully to see if any other equipment might suffice Then check the Purpose column to see what this item is used for If used for a performance check or adjustment that is of little or no importance for your measurement requirements the item and corresponding step s can be deleted TABLE 5 3 Test Equipment Description Minimum Specifications Purpose Examples of Applicable Test Equipment 1 DVM Digital Measurement range Check adjust low voltage a TEKTRONIX DM 501A Voltmeter with 15 V to 250 V supplies Check adjust Option 02 Digital Multi Meter test leads X Output DC Level operates in TM 500 Adiust bias R306 dynamic focus Crt grid bias R245 Check spot diameter power module b TEXTRONIX 7013 Digital Multi Meter operates in 7000 series mainframe TEKTRONIX DM 502A Option 02 Muiti Meter operates in TM 500 series power module 2 DC Voltmeter with
79. dwidth dc to at least 50 MHz deflection factor O 1 to 20 V div within 296 sweep rate 1 ms to 10 us div Check adjust Z axis gain compensation bandwidth and common mode rej ection Adjust focus and stigmators 10 Function Gen erator Waveshape sine Freq uency range 500 kHz to 1 MHz amplitude 0 15 V p p 11 Dual input Coupler Connectors bnc Check horizontal vertical and Z axis common mode rejection Check Z axis blanking Check adjust horizontal X vertical Y and Z axis common mode rejection and blanking horizontal and vertical phasing attenuation compensation and check spot diameter a TEKTRONIX 7904 Oscillo scope 7B92 time base and 7A13 Differential Comparator with P6063A 10X probe b TEKTRONIX 7603 Oscillo scope 7A15A Amplifier 7B50A Time Base and P6063A 10X probe c Refer to Tektronix catalog for compatible oscilloscope system TEKTRONIX FG 503 Function Generator operates in TM 500 Series power module TEKTRONIX 067 0525 01 Calibration Fixture 12 50 ohm Terminator Impedance 50 0 connectors bnc Adjust Z axis gain check Z axis common mode rejection a TEKTRONIX part 011 0049 01 5 10 REV A MAY 1980 TABLE 5 3 CONT Test Equipment Calibration 606B Description Minimum Specifications Purpose Examples of Applicable Test Equipment 13 5X Attenuator 5X 500 2 W
80. e 50959 aa Vertical Input 10X Probe Test Equipment Controis Dot Generator X Amplitude Y Amplitude Z Amplitude 50 Q High Z 32 64 dot swit Oscilloscope Time Div lusus Volts Div Midrange Midrange fully CCW a Turn off the 606B POWER b Observe that the defocus jumper P398 is in position B c Connect the test oscilloscope 10X probe to TP280 Z Axis output d Turn on the 606 POWER e Rotate the 6068 INTENSITY contro clockwise until volt is measured at TP280 then rotate the Z Amplitude Dot Generator clockwise until a pulse amplitude of 20 Volts is obtained at TP280 f Disconnect the Test Oscilloscope from the Monitor 5 52 g Provide a centered 7 9 division dot display on the 606B using the X and Y Amplitude controls Dot Generator and the horizontal and vertical Position controls 6068 h Set the FOCUS R76 front panel to midrange NOTE For optimum performance a hand magnifier of at least 5X should be used for viewing and ADJUSTing dots i ADJUST Coarse Focus R125 located on High Voltage board for smallest center dot Set the FOCUS R76 front panel fully counter clockwise ADJUST R385 Center Stig 1 and R295 Center Stig 2 for roundest center dot Locate the Stigmator 2 adjustments Observe right center edge of screen ADJUST R215 Right S2 for roundest dot Observe left center edge of scre
81. e Calibration Generator from the X INPUT and connect it to the X INPUT Install the grounding cap on the X INPUT k Center the display I ADJUST C107 X Atten Comp for optimum square corner 5 39 Calibration Part il 606B Adjustment and Performance Check C8 CHECK HORIZONTAL X COMMON MODE REJECTION 1X 5X ATTEN NOTE If the preceding step was not performed first perform step then proceed C8 SETUP CONDITIONS 6068 Controls Make no changes to the control settings Dual Input Coupler 6068 Rear Panel Ramp Generator Ramp Out Function Generator Output Trig In Q Trig Out bnc Cables Test Equipment Controls Ramp Generator Duration 10 ms Triggering AUTO Ext Amplitude Set for 8 div deflection Function Generator Function Frequency Amplitude Sine wave 500 kHz a Turn off the 6068 POWER Move the 50 0 1 MQ X INPUT Impedance Selecting Jumpers to the 1 position 5 40 b Turn on the 606B POWER c Connect the Function Generator output to the test Oscilloscope vertical input Do not terminate d Set the Function Generator controls for a 500 kHz 3 volt p p sinewave as indicated on the test Oscilloscope e Disconnect the sine wave signal from the test Oscilloscope and connect it using the dual input coupler to both the X and X INPUT connectors on the 606B f CHECK For 0 24 divisio
82. e base drive transformer T170 Quiescently the output transistors of U120 pins 11 12 13 14 are off Current flows from the 20 volt supply to 0165 0175 via VR160 VR170 R135 R136 and R152 R145 Zener diodes VR160 VR170 are conducting reverse biasing CR135 CR136 The base emitter junction potential of 0165 0175 plus the zener drop of VR160 VR170 are felt at the cathodes of CR135 CR136 The base of Q130 is at the 5 volt Reference Regulator level from U120 pin 16 Transistor Q130 is off and the base of Q150 is pulled to its emitter potential through R130 Since Q150 is off as just stated and Q165 Q175 are conducting transformer 170 is shorted In operation the output transistor U120 pins 13 14 is turned on saturated Two events simultaneously occur 1 Transistor Q170 saturates and turns off 0175 and 2 the on current of U120 pins 13 and 14 increases the voltage drop across R136 and turns on CR138 Q130 and Q150 Transistor Q165 pulls current through the upper half of T170 from current source Q150 CONVERTER OUTPUT The Converter Output circuit processes the output of the Converter Base Drive and couples the voltage generated in the primary of T170 to the Deflection Voltage Supplies and the HV Regulator stages The output of 0165 is coupled through T170 to the base of 0180 Transistor Q180 turns on to charge the LC tank L185 C185 C187 and supply a current through the primary of T200 Transistor Q180 is tu
83. e control settings 10 Atten 606B Rear Dual Input Coupler Function Generator Ramp Generator Square Wave Ramp Out Trig Out bnc Cables Test Equipment Controls Ramp Generator Ramp Signal 10 us Triggering AUTO Ext Amplitude full screen Function Generator Function Square wave Amplitude 2 5 V Referenced to gnd 2821 48 5 50 a Disconnect the signal to the Y INPUT b CHECK That the full square wave is visible Connect the signal to the Y INPUT c Turn off the 606B Move P176 and P179 to the LO position d CHECK That only the positive portion of the square wave is displayed e Turn off the 606B POWER Move the jumpers P176 P179 to the position f CHECK That only the negative portion of the square wave is displayed NOTE The Blanking Level Selecting jumpers should remain in the LO position for normal operation Calibration Part ll 606B Adjustment and Performance Check F DYNAMIC FOCUS 1 Digital Voltmeter DVM 3 Ramp Generator 2 required 6 Dot Generator Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 9 Test Oscilloscope with 10X probe 15 bnc cables 3 required 22 24X Magnifier F1 DYNAMIC FOCUS PRELIMINARY SETUP a Perform the Adjustment and Performance Check Power Up Sequence given at the beginning of Part H
84. e pins are completely disengaged pull the board to the rear until the extender shafts clear the bezel install the A1 X Y Output Amplifier board as follows refer to Figure 4 5 1 Align extender shafts with appropriate holes in bezel 2 Fully engage the interboard connector TRANSISTOR RETAINING BLOCKS 2 TRANSISTOR j RETAINING SCREWS INED TRANSISTOR RETAINING SCREWS EXTENDER SHAFTS 3 A1 X Y OUTPUT AMPLIFIER BOARD SHIELD SHOWN REMOVED 2821 18 Figure 4 5 A1 X Y Output Amplifier board removal 4 10 G 3 Replace 1 Board Mounting Screw 1 threaded spacer post and the 8 Transistor Retaining Screws Leave loose 4 Tighten all 9 screws and the spacer post 5 Plug in the 2 pin Harmonica P290 and the 4 individual crt neck pin connectors 6 Solder in 8 transistors 7 Position the fish paper insulation strips on both sides of the transistor mounting tabs Align the holes in the Transistor Retaining Blocks with those in the fish paper insulation strips and the chassis Secure the Transistor Retaining Blocks 8 Snap the shield in place then secure with 2 screws A2 X Y Pre Amplifier Board Remove the X Y Pre amplifier board as follows refer to Fig 4 6 1 Remove the smali L shaped shield covering the upper edge of the X Y Pre Amplifier board 2 Then remove the X Y Output Amplifier
85. eck requirement in part d cannot be met repeat the adjustments in step Calibration Part 11 6068 Adjustment and Performance Check E5 CHECK Z AXIS COMMON MODE REJECTION NOTE If the preceding step was not performed first perform step 1 then proceed E5 SETUP CONDITIONS 6068 Controis Z Axis Gain internal 1 volt full intensity See Step E2 50Q Terminator Test Oscillo scope Dual Input Coupler Function Generator Vertical input bne Cable Sine Wave OutO 10X Probe Test Equipment Controis Function Generator Function Sine wave Frequency _ MHz Amplitude 5 V Test Oscilloscope Beflection Factor coul LL NA i 1 Vediv Input Coupling AC Triggering Sweep Rate Internal 1 ms 2821 47 NOTE The Z Axis Gain must be set for 1 volt full intensity when performing this step Input Impedance Selecting jumpers P102 P106 are in the 1 MQ position as shipped from the factory a Connect the 10X probe from TP280 to the vertical input of the test Oscilloscope b CHECK The test Oscilloscope for 3 5 divisions 3 5 V or less 5 49 Calibration Part 11 6068 Adjustment and Performance Check E6 CHECK Z AXIS BLANKING NOTE If the preceding step was not performed first perform step 1 then proceed E6 SETUP CONDITIONS 6068 Controls Make no changes to th
86. eedback amplifiers consisting of Q120A 0130 0140 and Q1208 0135 O145 supply the push pull voltage required to drive the X Output Amplifier Transistor Q120 provides high input impedance and temperature stability The FET gates are diode clamped on the negative going overdrive signals to protect the field effect transistors from excessive input voltages The X Gain adjust R129 allows setting the 8 cm deflection from 0 5 volts to at least 2 5 volts 12 5 volts with attenuator switches S100 and S105 in the 5X position Front panel control R66 provides horizontal positioning by differentially altering the bias voltage on the base elements of Q150 and Q155 Transistors Q150 and Q155 function as a differential current source for the push pull output of the X Preamplifier SCAN LIMITER Transistors Q180 Q185 and diodes CR180 CR185 prevent overdriving the X Output Amplifier by limiting the X Preamplifier signals to within about 6 volts of each other Theory of Operation 6506B X FOCUS CORRECTION PICKOFF Samples of the X and X signals are coupled from the X Preamplifier to the X Absolute Value Amplifier diagram 4 for focus correction in the X axis A sampling of the X voltage signal is converted to a current signal by Q170 and the X voltage signal by Q175 before being applied to the X Absolute Value Amplifier X OUTPUT AMPLIFIER The X Output Amplifier consists of two identical noninverting operational amplifiers co
87. eflection factor The compensation networks connected to the emitter of Q100 optimize the square wave response to provide the very good settling time performance 3 3 Theory of Operation 606B e VERTICAL Y AMPLIFIER The Vertical Y Amplifier processes the Y input signals either single ended or differential and provides final amplification to drive the vertical deflection plates of the crt schematic diagram of the Vertical Y Amplifier is shown on diagram 2 A detailed block diagram identifying each major stage of the Vertical Y Amplifier is superimposed on the schematic with wide shaded lines to conveniently locate the components mentioned here The stage names given as sub headings in the following discussion can be found in the shaded boxes on diagram 2 Y INPUTS Three input signal connectors are provided to the Y Inputs stage 1 the Y INPUT noninverting bnc connector J30 2 the Y INPUT inverting bnc connector J40 and 3 the ALTERNATE INPUTS noninverting cannon connector J25 Signals can be appiied to any Y input connector as a single ended input or to either noninverting Y input J30 J25 and the Y INPUT inverting for a differential input Refer to Figure 2 3 in Section 2 Operating Instructions for J25 ALTERNATE INPUTS connector pin assignments internal switches S200 and S205 allow selection of either 1X or 5X attenuation of the input signal before it is applied to the Y Preamplifier
88. en p ADJUST R205 Left S2 for roundest dot q Observe top center edge of screen r ADJUST R225 Top S2 for roundest dot s Observe bottom center edge of screen t ADJUST R235 bottom S2 for roundest dot u Turn off the 606B POWER and move P398 Defocus jumper to position A v Turn on the 6068 POWER w Adjust FOCUS R76 front panel for roundest center dot x Observe right center edge of screen y ADJUST R415 right focus for roundest dot z Observe left center edge of screen Edge means center of edge of 7 x 9 cm quality area 2 At the edges and corners of the screen the defocused dot may be roughly triangular in shape Roundest dot then means most nearly equilateral aa ADJUST RA05 left focus for roundest dot bb Observe top center edge of screen cc ADJUST R425 top focus for roundest dot dd Observe bottom center edge of screen ee ADJUST R435 bottom focus for roundest dot ff Turn off the 606B POWER and move P398 Defocus jumper to position B gg Turn on the 606B POWER hh Turn the FOCUS R76 front panel fully counter clockwise to defocus the dot ii Observe the top right corner of the 7 x 9 quality area jj ADJUST R151 top right S1 for roundest dot kk Observe the other three corners H ADJUST R152 Top left S1 R161 bottom left S1 and R162 bottom right S1 for roundest dot in their respective corners mm At this point
89. enter b With no signal applied to the X INPUT connect the Precision Dc Voltmeter probes between the X Output Amplifier outputs TP173 TP178 Set the voltage between TP173 and TP178 to Volt within 1 Volt using the horizontal position control on the 606B d Remove the DVM LO INPUT lead from the test points TP173 or TP178 and connect it to chassis ground 5 35 Calibration Part 11 6068 Adjustment and Performance Check EXAMINE DVM for X plate dc level of 125 V bid E D or X plate dc level o within WARNING f ADJUST The X Plate DC Level R119 for 125 V Up to 250 V dc at potentially lethal currents within 1 0 V are present at the power transistor tabs and at other points on the X Y Output Amplifier board Use caution when servicing a Assure that attenuator switches 8100 S105 are in C3 ADJUST X AMPLIFIER GAIN R104 the 1X position and di T R109 129 AND CHECK POSITIONING ition and grounding caps are on all unused NOTE If the preceding step was not performed first b Position the display near horizontal screen center perform step C1 then proceed c EXAMINE For a crt display of exactly 4 5 cm amplitude C3 SETUP CONDITIONS 6068 Controls d ADJUST R109 Output Amplifier Gain located on X GAIN R104 ipio fully clockwise the X Y Output for a crt display of exactly 4 5 cm X Gain R229 internal fully clockwise amplitude NOTE This adj
90. er P398 or by remote input through pin 20 of the rear panel mounted 25 pin connec tor that is when the voltage at the base of Q390 increases it pulls current from the emitter of Q380 causing the voltage to drop at the output of the level shifter Q390 At pin 7 of the 25 pin connector 15 Visavailablethrough R397 to provide an external bias voltage for the Remote Defocus input pin 20 The voltage may be altered by a variable resistive divider to ground to allow external variable control of spot size STIGMATOR 2 CORRECTION SHAPER AND MIXER Outputs from both the X and Y Absolute Value Amplifiers are fed to the appropriate diode shaper circuits the outputs of which approximate parabolic transfer function The resultant waveforms are fed through independent gain controls R215 R205 R225 R235 to a mixer and clamp circuit O240 CR245 CR242 CR243 The output of Q240 is then fed to the Stigmator 2 Output Amplifier and Level Shifter before being applied to V50 6 ert STIGMATOR 2 OUTPUT AMPLIFIER AND LEVEL SHIFTER The stigmator 2 output amplifier is a feedback amplifier consisting of 0250 0260 0270 0280 The feedback network consists of R283 C283 with C283 supplying high frequency compensation 3 7 Theory of Operation 606B Transistors O270 and Q280 are connected as a collector coupled complimentary amplifier to provide a fast linear output signal Ac coupling is provided by C275 to decrease the high frequency ris
91. etime The output signal of the amplifier at Q280 ranges from approximately 5 volts to 75 volts The correction required by the Stigmator 2 element of the crt needs to be centered around the deflection plate average 125 volts Transistor Q290 and associated circuitry provide the necessary correction to shift the output voltage level before it s applied to the crt V50 6 FOCUS CORRECTION SHAPER AND MIXER Outputs from both the X and Y Absolute Value Amplifiers are fed to the appropriate diode shaper circuits Q400 CR400 Q410 CR410 0420 CR420 0430 CR430 the outputs of which approximate a parabolic transfer function The resultant waveforms are fed through independent gain controls R415 R405 R425 R435 toa mixer and clamp circuit O435 CR433 CR434 CR437 The output of Q435 is fed to the Focus Output Amplifier Z FOCUS A single ended output current from the Z Focus Correction Pickoff stage on diagram 3 is coupled through P150 pin 5 to the emitter of O140 The output of the current to voltage converter Q140 is adjusted Z Focus correction and fed through limiting diodes CR458 CR459 to the input of the Focus Output Amplifier FOCUS OUTPUT AMPLIFIER A correction voltage from the Z Focus stage is combined with the output of the Focus Correction Shaper and Mixer The resultant waveform is processed by the Focus Output Amplifier and fed through P195 1 to the Focus Element DC Restorer circuit on diagram 5 The Focus Output Am
92. f Q150 and Q155 Transistors Q150 and Q155 function as a differential current source for the push pull output of the Z Preamplifier LIMITER Diodes CR164 and VR163 prevent overdriving the Z Output Amplifier by limiting the Z Preamplifier signals to within about 6 volts of each other Z FOCUS CORRECTION PICKOFF Samples of the Z and Z signals are combined and coupled from the Z Preamplifier to the Z Focus circuit diagram 4 for focus correction in the Z axis Samples of the Z and Z signals are fed to Q180 and Q185 Transistors Q180 and Q185 provide a single ended output to drive the Z Focus circuit Z OUTPUT AMPLIFIER The push pull signals from the Z Preamplifier stage are applied to the bases of Q220 and O225 Transistors Q220 Q225 are voltage to current converters which with Q230 240 and Q245 produce a single ended current signal Transistors 0240 0245 0250 0260 0270 are connected as an operational amplifier with the feedback path provided through R285 R286 and C285 C286 High current low impedance drive is provided by the complementary configuration of emitter followers Q240 Q245 Complementary amplifiers Q260 Q270 provide the final gain for the Z output signals Transistor Q250 supplies the additional current necessary at high frequencies sine wave to drive the capacitive load High frequency compensation is provided by the combination of C285 and R239 TTL BLANKING Input signals applied to the rear panel TTL
93. fter use 606B Service 6068 FEATURES The 6068 Monitor is a general purpose very high resolution X Y display monitor providing a clear bright display of analog data This instrument is designed for display applications as in ultrasonic detection systems electronic microscope systems radiation and thermal scanning systeHis Speech therapy volume and vibration analysis and medical and biophysical systems The 6068 Monitor may also be used to provide displays of alpha numeric and graphic information fr m computers and other data transmission sy tems Resolution of the crt in this instrument is excellent shown with Option 6 installed vi Section 1 606 GENERAL INFORMATION This section contains a basic content description of both the Oparators and Service Manuals instrument functional description rackmounting information exterior cleanin ment packaging and specifications The Specification portion consists of three tables Electrical Environmen Ph A Standard Accessories list and full page instru OPERATORS MANUAL The Operators Manual is divided into the following t sections i 5 Calibration contains procedures to check erational performance and electrical istics of the instrument Procedures also Section 1 General Information contains description electrical specifications ul characteristics standard and recommended l d acce
94. g and safety glasses should be worn Avoid striking the crt on any object which might cause it to crack or implode When storing a crt place it in a protective carton or set it face down in a protected location on a smooth surface with a soft mat under the faceplate 1 Remove any protective side cabinet panels to gain access to the crt leads 2 Disconnect 6 leads from the crt neck pins NOTE The red and black leads exiting the crt shield to the X Y Output Amplifier board are connected to the display rotation coil inside the shield They will not hamper crt removal and need not be disconnected 3 Remove the 5 crt rear cover securing screws and remove the cover 4 Remove the crt base pin socket RED q CRT FRONT SUPPORT CRT CORNER SUPPORTS 4 IMPLOSION SHIELD BEZEL BEZEL SECURING SCREWS 2 Maintenance 6068 2821 16 Figure 4 4 Crt removal 5 Remove the bezel and snap in implosion shield by removing the 2 bezel securing screws on the front of the instrument 6 With one hand on the front of the instrument gently push on the crt base to slide the crt forward The crt front support will slide out with the crt 7 Press the crt front support toward the rear of the crt The corner supports will fall away CATHODE RAY TUBE REPLACEMENT Replace the cathode ray tube crt as follows see Fig 4 4 1 Install the front and corner supports on the crt 2 Guide the
95. hour after 20 minutes warmup Less than 0 2 cm drift in 24 hr with cabinet covers in place Less than 0 2 cm drift from 0 to 50 C ambient temperature variation after 20 min warmup Gain Stability Crosstalk Between X and Y Amplifiers at 1 MHz _ Less than 196 change under all conditions of line voltage sand temperature 0 005 cm 0 002 inch or less of deflection on the undriven channel with full screen amplitude of 1 MHz sinewave applied to the other channel Other inputs grounded or terminated into 50 ohms Between Z and X or Y Amplifier 0 012 cm 0 005 inch or less of deflection on the undriven channels when the Z Axis Amplifier is driven for a 70 V output with a 1 MHz sinewave X and Y inputs grounded ir terminated into 50 ohms Z AXIS AMPLIFIER Gain Range e ihternal adjustment allows a 1 volt to 5 volts input to generate ithe maximum allowable voltage swing at the crt control grid V to 70 V Bandwidth to 5 MHz at 3 dB point Risetime 35 ns or less Aberration 5 or less Common Mode Rejection Dc to 1 MHz i At least 100 1 5 volts peak input 4 8 REV A MAY 1980 General Information 606B TABLE 1 3 CONT Electrical Characteristics Characteristic Performance Requirement input Impedance 1 MQ within 1 or 50 within 1 paralleled by 47 pF or less Maximum Nondestruct
96. iagram of the Low Voltage Power Supply is shown on diagram 6 at the rear of this manual A detailed block diagram showing each major stage of this circuit is superimposed on the schematic with wide shaded lines The stage names given as sub heading in the following discussion can be found in the shaded blocks on diagram 6 POWER INPUT Power is applied to the primary of transformer T95 through fuse F90 thermal cutout S92 POWER switch 590 and Line Voltage Selector plug P390 The Line Voltage Selector plugs allow changing the primary winding taps of T95 to meet different line voltage and regulating range requirements Line fuse F90 should be changed for each nominal line voltage current rating of fuse for 220 volt operation must be 0 6 ampere slow blowing type for 120 volt operation the current rating of the fuse must be 1 2 ampere slow blowing type Thermal cutout S92 provides thermal protection for this instrument If the internal temperature of the instrument exceeds a safe operating level 592 opens to interrupt the applied power When the temperature returns to a safe level S92 automatically closes to re apply the power RECTIFIER AND FILTER A full wave bridge circuit composed of CR301 CR302 CR305 CR306 rectifies the ac voltage from the secondary of T95 Filtering is provided by C300 C305 C310 C315 18 VOLT UNREGULATED SUPPLY The 18 Volt Unregulated Supply provides the 18 volt unregulated power for the Converter B
97. idth of the oscillator output pulse This pulse is used as a blanking pulse to both outputs 0120 pins 11 12 13 14 to insure that there is no possibility of having both outputs on simultaneously during transition ERROR AMPLIFIER The Error Amplifier stage is a differential input transconductance amplifier The 250 volt supply is sampled by R101 R102 and R110 R112 and fed to U120 pin 1 the input to the Error Amplifier The other input U120 pin 2 is connected to a reference voltage provided by the voltage divider R114 R115 Any increase or decrease n the voltage at U120 pin 1 will cause a corresponding decrease or increase in the output of the Error Amplifier The over voltage circuit will shut down U120 s output when the voltage of the 95 volt supply reaches approximately 110 volt VR109 the Over Voltage transistor turns on thereby pulling the Error Amplifier output toward ground CURRENT LIMITER The Current Limiter stage provides circuit protection by disabling the Error Amplifier output Shutdown will occur when current of approximately 1 5 amperes is exceeded in the Converter Output transistors Q180 Q190 The current limit amplifier U120 pin 4 turns on pulling the output of the Error Amplifier toward ground thus shutting off the outputs CONVERTER BASE DRIVE The Converter Base Drive circuit uses the pulses from the Converter Oscillator to generate the pulse width modulated signa necessary to driv
98. imately volt by R295 V ADJ input protection feedback and compensation are provided to U280 by CR283 CR285 R270 and R275 C275 respectively The output of U280 is fed through R266 R265 to the base of the regulator transistor 0260 Transistor 0260 in conjunction with Q250 sets the voltage on the feedback line through R260 R250 R153 to the multiplier return junction of C162 C171 to set the voltage on the anode of CR171 The cathode will go more or less positive but remain above ground CONTROL GRID DC RESTORER The Control Grid DC Restorer stage couples the dc and low frequency components of the Z Axis Amplifier output signal to the crt control grid pin 3 of V50 This allows the Z Axis Amplifier to control the crt beam intensity The potential difference between the Z Axis Amplifier output level and the crt control grid prohibits direct coupling The Control Grid DC Restorer stage is actually a cathode referenced bias supply for the crt control grid Quiescently its output voltage is more negative than the crt cathode by an amount determined by the Z Axis Amplifier output level and the setting of the Grid Bias adjustment R245 The cutoff voltage at the crt control grid is typically about 100 volts more negative than the ert cathode level The Control Grid DC Restorer stage is divided into two sections for ease of explanation The first section can be considered a modulator at low voltage potentials and the rema
99. in the instrument therefore the cause of overheating must be corrected to prevent recurrence of the damage CLEANING The 606B Monitor should be cieaned as often as operating conditions require Accumulation of dirt in the instrument can cause overheating and component breakdown Dirt on components acts as an insulating blanket which prevents efficient heat dissipation and also provides an electrical conduction path which may result in instrument failure Cabinet panels will provide Some protection against dust in the interior of the instrument CAUTION Avoid the use of chemical cleaning agents which might damage the plastics used in this instrument Use a nonresidue type of cleaner preferably isopropyl alcohol or total denatured ethyl alcohol Before using any other type of cleaner consult your Tektronix Service Center EXTERIOR Loose dust accumulated on the outside of the instrument can be removed with a soft cloth or small brush The brush is particularly useful for dislodging dirt on and around the front panel controls Dirt which remains can be removed with a soft cloth dampened in a mild detergent and water solution Abrasive cleaners should not be used CRT Clean the crt faceplate with a soft lint free cloth dampened with denatured alcohol INTERIOR Cleaning the interior of the instrument should be performed in conjunction with the visual inspection The best way to clean the interior is to blow off the accum
100. incorrectly Use the procedure given in Section 5 Calibration to adjust the power supplies TABLE 4 1 Low Voltage Supply Limits Supply Test Limits Ripple Point Volts dc T F 15V TP352 14 95 to 2mV 15 05 or less 15V TP354 15 2 to 2mV 14 8 or less 95 V TP351 94 0 to 100 mV 98 0 or less 250 V TP350 249 to 150 mV 251 or less Figure 8 17 in Section 8 Diagrams and Circuit Board lilustrations provides a guide for locating a defective circuit Start at the top left of the Troubleshooting Chart and perform the checks given across the top of the chart until the indicated results are not found Then proceed to further checks or the circuit in which troubie is suspected as listed underneath the step The shaded blocks of the Troubleshooting Chart indicate circuit stages that may cause the malfunction and correspond 4 6 directly to the functional blocks on the schematic diagrams The circuits listed are discussed in detail in Section 3 Theory of Operation After the defective circuit has been located proceed with steps 6 and 7 of Troubleshooting Techniques to isolate the defective component 6 CHECK VOLTAGES AND WAVEFORMS Often the defective component can be located by checking for the correct voltages or waveforms in the Circuit Typical voltages and waveforms are given in Section 8 Diagrams and Circuit Board Illustrations NOTE Voltages and waveforms given in Sectio
101. ing The first few checks assure proper connection operation and adjustment If the trouble is located by these checks the remaining steps aid in locating the defective component When the defective component is located replace it using the replacement procedure given under Component Replacement in this section 1 CHECK CONTROL SETTINGS Incorrect control settings can indicate a trouble that does not exist If there is any question about the correct function or operation of any control on the 6068 refer to Section 2 Operating Instructions 2 CHECK ASSOCIATED EQUIPMENT Before proceeding with troubleshooting check that the equipment used with this instrument is operating correctly Also check that the input signals are properly connected and that the interconnecting cables are not defective Check the line voltage source WARNING Although this Monitor is not to be connected to a patient interconnecting this Monitor to other equipment can result in the application of excessive current to a patient t is extremely important that the interconnection is made in accordance with NFPA 76B T Tentative Standard for the Safe Use of Electricity in Patient Care Areas of Health Care Facilities section 3038 Signal Transmission Between Appliances 3 VISUAL CHECK Visually check that portion of the instrument in which the trouble is located Many troubles can be found by visible indications such as unsoldered connections broke
102. ing the front panel FOCUS control adjust the trace for optimum width while observing with the hand magnifier REV A MAY 1980 7 Calibration Part 606 Adjustment and Perfcrmance Check c ADJUST C106 HF Comp 1 and RTO3 HF Comp 3 for optimum bottom leading corner NOTE R103 affects the sharpness of the leading corner Adjust so that the corner and the area just after the corner is flat d Remove the square wave from the X INPUT and apply it to the X INPUT Install the grounding cap on the unused input Center the display e EXAMINE The front corner and move C179 HF Comp 2 slightly to verify that the corner is optimum NOTE If C179 or the board was replaced preset C179 to approximately 1 2 its adjustable length f ADJUST C179 HF Comp 2 for optimum front corner Use the hand magnifier for close observation g INTERACTION Repeat steps c and f adjusting C179 HF Comp 2 for the top corner and C106 HF Comp 1 for the bottom corner until both positive and negative going waveforms are optimum h Increase the ramp duration to 3 ms and set the Calibration Generator period to 0 1 ms 10 kHz to obtain about 4 cycles cm i ADJUST C108 LF Comp for optimum front corner j Move C179 slightly to verify that the front corner is optimum NOTE The last fine adjustment should be made with C179 k Position the display slowly left and right of graticule center until 1 cm re
103. ining section as a demodulator at high voltage potentials 3 9 Theory of Operation 6068B Modulator When the secondary winding output of T200 pin 16 swings positive C131 charges through C230 R230 R236 and R131 to a voltage level determined by the setting of the Grid Bias adjustment R245 At this voltage level approximately 100 volts diode CR240 conducts preventing any additional increase in the positive voltage across C131 When the secondary winding output swings negative diode CR240 turns off Then CR232 conducts and clamps the negative excursion at C131 to the voltage level of the Z Axis Amplifier output The result is a square wave output from the Modulator the output amplitude is determined by the difference between the Z Axis Amplifier output level and the Grid Bias adjustment setting This square wave is coupled through C131 to the Demodulator Demodulator The Demodulator rectifies the signal from the Modulator and references it to the crt cathode supply level The positive swing is limited by CR137 to the level of the cathode supply the negative excursion is coupled through CR134 to C133 Quiescentiy C133 will charge to about 5400 volts through R148 After repetitive cycles from C131 C133 will charge to its maximum negative level Capacitor C133 filters the output of the demodulator and also provides a path for the high frequency portions of the Z Axis Ampiifier output signal to be coupled to the crt contr
104. ion Minimum Specifications Purpose Examples of Applicable Test Equipment 5 Sine wave Generator Frequency range 500 kHz to at least 5 MHz reference frequency 50 kHz amplitude O 5V to 5V into 50 x amplitude accuracy constant within 596 of reference as output frequency changes Check common mode rejection and bandwidth of the horizontal X vertical Y and Z Axis amplifiers TEKTRONIX SG 503 Leveled Sine Wave Generator loperates in TM 500 series power module 6 Dot Generator Provides dot raster display frame rate at least 45 frames second Adjust focus and stig mators An alternative method is provided which does not require a dot generator a TEKTRONIX 067 0845 00 Dot Generator operates in TM 500 series power module b TEKTRONIX 067 0561 01 Test Display Generator Calibration Fixture 7 Power Module Mainframe TM 500 series Capable of powering and housing 3 to 6 TM 500 series test instruments Provide housing and power for TM 500 series test signal generators and precision dc volt meter a TEKTRONIX TM 503 TM 504 or TM 506 Power Module 8 Digital Counter Dual channels separate inputs A B Measure ment of ratio of A B averaged over 10 cycles of B AC coupling Check spot diameter a TEKTRONIX DC 503 Universa Counter operates in TM 500 series power module 9 Test Oscilloscope with 10X probe Ban
105. ion Stability 0 1 cm or less drift per hr after 20 minute warmup Gain Stability Less than 196 change under ali conditions of line voltage and temp erature Crosstalk Between X and Y Amplifiers 0 005 cm 0 002 inch or less of deflection on the undriven channel with full screen amplitude of 1 MHz sine wave applied to the other channel Other inputs grounded or terminated into 50 ohms From Z to X Amplifier Deflection Factor 0 012 cm 0 005 inch or less of deflection on the undriven channels when the Z Axis Amplifier is driven for a 70 V output with a 1 MHz sine wave X and Y inputs grounded or terminated into 50 ohms Does not normally require customer verification VERTICAL Y AMPLIFIER Internally adjustable from 0 5 V to 2 5 V for 8 divisions of deflection Externally adjustable for at least 10 of nominal D2 Check Positioning and Gain D2 Adjust Y Amplifier Gain and Check Positioning Input Attenuators Allows a 5X increase in deflection factor D5 Check Vertical Input Attenuation D6 Check Vertical Input Attenuation REV A MAY 1980 5 5 Calibration 606B TABLE 5 2 CONT Performance Check Summary Characteristic Performance Requirement Part Performance Check Procedure Title Part Il Adjustment and Performance Check Procedure Title Does not normally require cu stomer verificatio
106. ion is essential when troubleshooting circuits using integrated circuits In addition operating waveforms logic levels and other operating information for the integrated circuits are give in Section 3 Theory of Operation and Section 8 Diagrams and Circuit Board Illustrations Use care when checking voltages and waveforms around the integrated Circuits so that adjacent leads are not shorted together A convenient means of clipping a test probe to the in line multi pin integrated circuits is with an integrated circuit test clip This device also doubles as an integrated circuit extraction tool Diodes A diode can be checked for an open or shorted condition by measuring the resistance between terminals with an ohmmeter set on a scale having a low internal source current such as the R X 1K scale The resistance should be very high in one direction and very low when the meter leads are reversed n n n n M CAUTION PPS When checking diodes do not use an ohmmeter scale that has a high internal current s nce high currents may damage the diodes under test Maintenance 606B Resistors Check the resistors with an ohmmeter Resistor tolerance is given in Section 7 Replaceable Electrical Parts Normally resistors do not need to be replaced unless the measured value varies widely from the specified value Capacitors A leaky or shorted capacitor can best be detected by checking resistance with an ohmmeter on the highes
107. isions of deflection b Slowly increase the Sine Wave Generator output frequency until the display amplitude is 4 2 divisions 5 44 CHECK That the Sine Wave Generator is at least 3 MHz D6 ADJUST VERTICAL Y ATTENUATOR COMPENSATION 203 C207 AND CHECK VERTICAL INPUT ATTENUATION NOTE If the preceding step was not performed first perform step D1 then proceed Before performing the following procedure set the Vertical Y Amplifier sensitivity 606B for 1V 8cm deflection See step D2 D6 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear Panel bnc Cables Ramp Generator Ramp High Amp Output Dual Input Coupler Test Equipment Controls Ramp Generator Duration LUCR AME 10 ms Triggering AUTO Ext Calibration Generator Output 3 5 Std Ampl Amplitude qu Eo d 0 1 ms 10 kHz 2821 41 NOTE In this step the test Oscilloscope is used as the amplitude measurement standard The accuracy of the measurement of input attenuation is determined by the test Oscilloscope vertical sensitivity calibration a Verify that the Vertical Y Amplifier sensitivity is set for 1V 8cm deflection b Turn off the 6068 POWER Set the and Atten Switches 8200 S205 in the 5X position back Turn on the 606B POWER c Connect the Calibration Gener
108. ive Input Voltage fault condition only 1 MQ Input impedance 100 V 50 Input Impedance 5 V de peak ac Transfer Curve Deviation from linear response of light output to voltage input is less than 20 of maximum intensity between 10 and 10096 0f maximum intensity TTL Input Logic input blanks or unblanks crt to level set by INTENSITY control and Z INPUT voltage HI 2 4 V to 5 V LO OV to 0 8 V Rise Time 35 ns or less Fali Time 35 ns or less Stability jc Light putput varies less than 5 under all conditions of line voltage and temperature when intensity is set for atleast 10 of maximum brightness i pee CATHODE RAY TUBE Display Area 8 10 cm Quality Area 7 9 Geometry full screen Bowing or tiit 1 mm or less Orthogonality full screen Compression and Expansion Phosphor BENI Standard P31 4 Option 78 en Deflection Electrostatic Spot Diameter P31 phosphor 0 078 m 0 0031 inch or less with INTENSITY set for 3 45 uW cmY 700 line 7 x 9 cm focused raster Spot Shape quality area 3 The ratio between two perpendicular spot cross sections does not exceed 1 5 1 Spot Growth quality area Not greater than 20 at constant intensity 1 9 General information 606B TABLE 1 3 CONT Electrica Characteristics Characteristic Performance Requirement Grid Drive Idas Appr
109. iven in Section 8 Diagrams and Circuit Board Illustrations Stages are outlined on the schematics with wide shaded lines the stage names are in shaded boxes Refer to these schematics throughout the following discussions for specific electrical values and relationships BLOCK DIAGRAM The following discussion is provided to aid in understanding the overall concept of the 6068 before the individual circuits are discussed in detail A basic block diagram is shown in Figure 3 1 The Horizontal X and Vertical Y Amplifiers process the input signals either single ended or differential and provide push pull outputs to drive the crt deflection plates The input signals are applied through the appropriate noninverting and inverting input connectors The Z Axis Amplifier controls the display intensity by providing a voltage to drive the crt contro grid The input signals either single ended or differential are applied through the appropriate noninverting and inverting input connectors to the ALTERNATE INPUTS connector The Dynamic Focus circuit provides focus correction for the display when it is deflected from the crt center Thus by varying the voltage to the crt gun elements the Dynamic Focus circuit compensates for geometric defocusing The High Voltage and Low Voltage Power Supplies provide all the voltage necessary for operation of this instrument DETAILED CIRCUIT OPERATION Complete schematic diagrams are provided i
110. izontal deflection Calibration Part 1 606B Performance Check C6 CHECK HORIZONTAL X COMMON MODE REJECTION 1X 5X ATTEN NOTE If the preceding step was not performed first perform step C1 then proceed C6 SETUP CONDITIONS 606B Controls POWER Dual Input Coupler 6068 Rear Ramp Generator Ramp Out O Function Generator Q Output O Trig Out bnc Cables Test Equipment Controls Ramp Generator Duration 10 ms Triggering AUTO Ext Amplitude set for 8 div deflection Function Generator Function Sine wave Frequency 500 kHz Amplitude 3 V 2821 36 2821 79 a Move the 0 1 X INPUT Impedance Selecting Jumpers to the 1 position b Turn on the 6068 POWER c Connect the Function Generator output to the test Oscilloscope vertical input Do not terminate d Set the Function Generator controls for a 500 kHz 3 volt p p sinewave as indicated on the test Oscilloscope e Disconnect the sine wave signal from the test Oscilloscope and connect it using the dual input coupler to both the X and X INPUT connectors on the 606B f CHECK For 0 24 division or less of free running horizonta display on the 606B position as necessary g Turn off the 606B POWER Set S100 X Atten and S105 X Atten to the 5X position switches back 5 17 Calibration Part I 606B Performance
111. k Horizontal X Common Mode Rejection 1X 5X 5 17 D VERTICAL Y AMPLIFIER 5 19 1 Vertical Y Amplifier Preliminary Setup 5 19 2 Check Positioning and 5 19 3 Check Vertical Settling Time 5 20 4 Check Vertical 5 20 5 Check Vertical Input Attenuation 5 21 6 Check Vertical Y Common Mode Rejection 1X 5X 5 21 7 Check Phasing nnn 5 22 E Z AXIS AMPLIFIER 23 1 Z Axis Amplifier Preliminary Setup 5 23 2 Check 5 23 3 Check Z Axis Amplifier Bandwidth 5 24 4 Check Z Axis Common Mode Rejection 5 24 5 Check Z Axis Blanking 25 DYNAMIC FOCUS 5 26 1 Dynamic Focus Preliminary Setup 5 26 2 Check Spot Diameter 5 26 5 12 PERFORMANCE CHECK POWER UP SEQUENCE NOTE The performance of this instrument can be checked at any ambient temperature from 0 to 50 C unless otherwise stated Adjustments must be performed at an ambient temperature from 15 to 25 C for specified accuracies 1 Remove any cabinet panels to gain access to the internal controls selectors and test points 2 Check that the internal Line Voltage
112. l ETTET eee 4 5 A1 X Y Output Amplifier board removal 4 6 A2 X Y Pre Amplifier board removal s 4 7 A3 Low Voltage Power and Z Axis board iemoval a HR 4 8 A4 Converter board removal 2 4 9 A5 High Voltage board removal 4 10 A6 Dynamic Focus and Front Panel Control board removal 4 11 Exploded view of circuit board pin and i cioe A rm ent ele ee PETI D ERN 4 15 5 1 Typical crt display for horizontai settling time measarement 5 16 5 2 Typical crt display for vertical settling time measurement 66 eee erence eee 5 20 the Hustrations in section 8 are located near their associated iagrams on the foldout page Semiconductor Lead Configurations 606B Board Locator 1 Outsat Amplified circuit board assembly A2 X Y Preamplifier circuit board assembly A1 X Y Output Amplifier cifcuit board assembly A2 X Y Preamplifier circuit board assembly A3 Low Voltage Power amp Z Axki5 circuit board assembly A6 Dynamic Focus amp Front Panel Gentrelie circuit board assembly A4 Converter circuit board asenibly AB High Voltage circuit board assembly A3 Low Voitage Power amp Z Axis circuit board assembly A6 Dynamic Focus amp Front Panel Control circuit board assembly Test Point and Adjustment Locations A Test Point and Adjustment Locations Interna Control and Selector Loc tions Troubleshooting Chart Detailed Dimensional
113. lay EXAMINE The front corner and move C279 HF Comp 2 slightly to verify that the corner is optimum NOTE ff C279 or the board was replaced preset C279 to approximately 1 2 its adjustable length f ADJUST C279 HF Comp 2 for optimum front corner Use the hand magnifier for close observation g INTERACTION Repeat steps c and f adjusting C279 HF Comp 2 for the top corner and C206 HF Comp 1 for the bottom corner until both positive and negative going waveforms are optimum h Increase the ramp duration to 3 ms and set the Calibration Generator period to O 1 ms 10 kHz to obtain about 4 cycles cm i ADJUST C208 for optimum front corner j Move C279 slightly to verify that the front corner is optimum NOTE The last fine adjustment should be made with C279 k Position the display slowly above and below the graticule center until 1 cm of display remains on the screen 1 EXAMINE That response occurs no visible shift in front corner REV A MAY 1980 Calibration Part i1 606B Adjustment and Performance Check D4 CHECK VERTICAL SETTLING TIME NOTE if the preceding step was not performed first perform step D1 then proceed D4 SETUP CONDITIONS 606B Controls Make no changes to the control settings 606B Rear Panel Calibration Generator Fast Rise Out bne Cables Test Equipment Controls Ramp Generator Duration 300 us
114. ld be direct replacements unless you know that a different component will not adversely affect instrument performance Most of the mechanical parts used in this instrument have been manufactured by Tektronix Inc To determine manufacturer of parts refer to Parts List Cross Index Mfr Code Number to Manufacturer When ordering replacement parts from Tektronix Inc include the following information 1 Instrument type 2 Instrument serial number 3 A description of the part if electrical include the circuit number if crt also include all data on crt tag 4 Tektronix part number SOLDERING TECHNIOUES To avoid electric shock disconnect the Monitor from the power source before soldering The reliability and accuracy of this instrument can be maintained only if proper soldering techniques are used when repairing or replacing parts General soldering techniques which apply to maintenance of any precision electronic equipment should be used when working on 4 7 Maintenance 606B this instrument Use only 60 40 resin core electric grade solder The choice of soldering iron is determined by the repair to be made When soldering on circuit boards or small wiring use only a 15 watt pencil type soldering iron A higher wattage soldering iron can cause the etched circuit run to separate from the board base material and melt the insulation from small wiring Always keep the soldering iron tip properly tinned to en
115. least 5X should be used for viewing and ADJUSTing dots e ADJUST Coarse Focus R125 located on High Voltage board for smallest dot f Set the FOCUS R76 front panel fully counter clockwise g ADJUST R385 Center Stig 1 and R295 Center Stig 2 for roundest dot h Locate the Stigmator 2 adjustments i Move the dot to the right center edge of screen 1 ADJUST R215 Right S2 for roundest dot Edge means center of edge of 7 x 9 cm quality area At the edges and corners of the screen the defocused dot may be roughly triangular in shape Roundest dot then means most nearly equilateral 5 53 Calibration Part il 606B Adjustment and Performance Check k Move the dot to the left center edge of screen 1 ADJUST R205 Left S2 for roundest dot m Move the dot to the top center edge of screen n ADJUST R225 Top S2 for roundest dot o Move the dot to the bottom center edge of screen ADJUST R235 bottom S2 for roundest dot q Turn off the 6068 POWER and move P398 Defocus jumper to position r Turn on the 606B POWER s Adjust FOCUS R76 front panel for roundest dot t Move the dot to the right center edge of screen ADJUST R415 right focus for roundest dot v Move the dot to the left center edge of screen w ADJUST R405 left focus for roundest dot x Move the dot to the top center edge of screen y ADJUST R425 top focus for roundest dot z
116. litude provide B div deflection 2821 57 2821 73 B5 ms 5 14 e Calibration Part 606B Performance Check C HORIZONTAL X AMPLIFIER Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 1 DVM Digital Voltmeter 3 Ramp Generator 4 Calibration Generator 5 Sine Wave Generator 9 Test Oscilloscope with 10X probe 10 Function Generator 11 Dual Input Coupler 15 bnc cables 3 required C1 HORIZONTAL X AMPLIFIER PRELIMINARY SETUP a Perform the Performance Check Power Up Sequence given at the beginning of Part I Performance Check b Refer to Section 6 Instrument Options and the Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board illustrations d Set 606B Controls INTENSITY Visible display Vertical and Horizontal Position Midrange FOCUS Well defined display C2 CHECK POSITIONING AND GAIN NOTE Perform step C1 then proceed C2 SETUP CONDITIONS 606B Controls Make no changes to the contro settings Ramp Generator 606B Rear Panel O Ramp Out bnc Cabie Test Equipment Controls Ramp Generator Ramp Signal Triggering 2 Amplitude provide 8 div deflection
117. lloscope Disconnect the sine wave signal from the test Oscilloscope and connect it using the dual input coupler to both the Y and Y INPUT connectors on the 6068 f CHECK For 0 24 division or less of free running vertical display on the 606B position as necessary g Turn off the 606B POWER Set S200 Y Atten and S105 Y Atten to the 5X position switches back h Turn on the 606B POWER 5 21 Calibration Part I 606B Performance Check i Repeat part c and d then increase the Function Generator output to 15 volts p p j Repeat part e CHECK For 0 6 division or less of free running vertical display on the 606B position as necessary 1 Turn off the 606B POWER Return S200 Y ATTEN and 105 Y ATTEN to the 1X forward position Turn on the 606B POWER D7 CHECK PHASING NOTE If the preceding step was not performed first perform step D1 then proceed D7 SETUP CONDITIONS 6068 Controls Make no changes to the control settings Dual Input 6068 Rear Coupler Sine Wave Generator bnc Cable Output O Test Equipment Controls Sine Wave Generator Frequency Amplitude 2821 43 2821 84 a Center the display within the graticule area b CHECK That the diameter of the displayed ellipse measured vertically at the center of the graticule is 0 1 division or less 5 22 Calibration Part 1 606 Performance Check E Z AXIS AMPLIFIER 3 Ram
118. mains on screen EXAMINE That no visible shift in front corner response occurs 5 37 Calibration Part 606 Adjustment and Performance Check C5 CHECK HORIZONTAL SETTLING TIME NOTE If the preceding step was not performed first perform step C1 then proceed C5 SETUP CONTROLS 606B Controls Make no changes to the control settings 6068 Rear bnc Cables Test Equipment Controls Ramp Generator 300 us AUTO Ext set for 8 div deflection Triggering Amplitude Calibration Generator fast rise 10 us 100 kHz 2821 33 a Set the square wave amplitude to provide 8 cm of horizontal deflection while centering the display using the horizontal Position control b EXAMINE That the area after the front corner is flat within a finely focused trace width 0 003 inch c Set the Ramp Generator to 10 ws and increase the amplitude to provide 10 cm of horizontal deflection d CHECK That the time required for the leading edge of the square wave to travel from the zero percent level to the 100 percent level see Fig 5 3 is 500 ns 0 4 div or less within a trace width 0 008 cm 5 38 m ES TIME C2531 58 Figure 5 3 Typical crt display for horizontal settling time measurement C6 CHECK HORIZONTAL BANDWIDTH NOTE If the preceding step was not performed first perform step C1 then proceed C6 SETUP CONDITIONS 6
119. n D5 Check Vertical Bandwidth Polarity Signal deflects beam to the right Signal deflects beam to the left Bandwidth Dc to at least 3 MHz D4 Check Vertical at 3 dB point Bandwidth Settling Time D3 Check Vertical After deflection between any 2 points on screen Spot must reach new writing position within 0 008 cm 0 003 inch within 500 ns After deflection to any point on screen from within 10 cm of screen center Spot must reach new writing position within 0 008 cm 0 003 inch within 700 ns Settling Time D4 Check Vertical Settling Time Phase Difference Dc to 500 kHz 1 or less between X and Y amplifiers D7 Check Phasing D8 Check Phasing Risetime 116 nsec or less Does not normally require cu stomer verification However risetime can be calculated from the Horizontal Bandwidth Common Mode Rejection Atten in X1 Position DC to 500 kHz At least 100 1 for signals of 3 V peak or less 500 kHz to At least 40 1 for signals 1 MHz of 15 V peak or less Atten in X5 P osition DC to 500 kHz At least 40 1 for signals of 15 V peak or less D6 Check Vertical Y Common Mode Rejection D7 Check Vertical Y Common Mode Rejection Maximum Non Destructive Input Voltage fault i condition only 1 MQ input impedance 100 V or 100 V dc peak ac 50 Q input impedance 5 V or 5 V dc peak ac S
120. n or less of free running horizontal display on the 606B position as necessary g Turn off the 606B POWER Set 100 X Atten and 105 X Atten to the 5X position switches back h Turn on the 6068 POWER i Repeat part c and d then increase the Function Generator output to 15 volts p p j Repeat part e k CHECK For 0 6 division or less of free running horizontal display on the 6068 position as necessary 1 Turn off the 606B POWER Return 5100 X Atten and 5105 X Atten to the 1X forward position m Change the input impedance to 50 Q Calibration Part 606 Adjustment and Performance Check D VERTICAL Y AMPLIFIER 3 Ramp Generator 4 Calibrator Generator 5 Sine Wave Generator 10 Function Generator Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 11 Dual Input Coupler 1 required 15 bnc cables 3 required 21 9X magnifier D1 VERTICAL Y AMPLIFIER PRELIMINARY SETUP a Perform the Adjustment and Performance Check Power Up Sequence given at the beginning of Part ll Adjustment and Performance Check b Refer to Section 6 Instrument Options and the Change information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board illustrations d Set 6068
121. n wires damaged circuit boards and damaged components 4 5 Maintenance 6068 4 CHECK INSTRUMENT ADJUSTMENT Check the electrical adjustment of this instrument or of the affected circuit if the trouble appears in one circuit The apparent trouble may only be a result of misadjustment Complete adjustment instructions are given in Section 5 Calibration 5 ISOLATE TROUBLE TO A CIRCUIT To isolate trouble to a particular circuit note the trouble symptom The symptom often identifies the circuit in which the trouble is located When trouble symptoms appear in more than one circuit check the affected Circuits by taking voltage and waveform readings Incorrect operation of all circuits often indicates trouble in the power supplies Check first for the correct output voltage of the individual supplies A defective component elsewhere in the instrument can appear as a power supply trouble and may also affect the operation of other circuits Table 4 1 lists the output voltage range and typical ripple of the power supplies in this instrument These voltages are measured between the power supply test points and ground see the Test Point and Adjustment Locations foldout pages in Section 8 Diagrams and Circuit Board illustrations for test point locations If the power supply voltage and ripple is within the listed range the supply can be assumed to be working correctly If outside the range the supply may be misadjusted or operating
122. n 8 Diagrams and Circuit Board lllustrations are not absolute and may vary slightly between Monitors To obtain operating conditions similar to those used to make these readings see the appropriate schematic 7 CHECK INDIVIDUAL COMPONENTS The following procedures describe methods of checking individual components Components which are soldered in place are best checked by first disconnecting one end This isolates the measurement from the effects of surrounding circuitry WARNING To avoid electric shock always disconnect the Monitor from the power source before replacing components Fuses Check for open fuses by checking the continuity with an ohmmeter The location and rating of power supply fuses is shown in Figure 1 1 General Information section Transistors A good check of transistor operation is actual performance under operating conditions A transistor can most effectively be checked by substituting a new component for it or one which has been checked previously However be sure that circuit conditions are not such that a replacement transistor might also be damaged If substitute transistors are not available use a dynamic tester Static type testers are not recommended since they do not check operation under simulated operating conditions Integrated Circuits Integrated circuits can be checked with a voltmeter test oscilloscope or by direct substitution good understanding of the circuit operat
123. n Section 8 Diagrams and Circuit Board Illustrations The numbers inside the diamond above a heading in the following discussions refer to the schematic diagram for that circuit The schematic diagrams contain wide shaded borders around the major stages of the circuits to conveniently locate the components mentioned in the following discussions The name of each stage is given in a shaded box on the diagram and as sub headings in the discussion of that schematic diagram headings in the following discussion can be found in the e mentioned here The stage names given as sub shaded boxes on diagram 1 HORIZONTAL X AMPLIFIER The Horizontal X Amplifier processes the X input signals either single ended or differential and provides final X INPUTS amplification to drive the horizontal deflection plates of the crt schematic diagram of the Horizontal X Three input signal connectors are provided to the X Amplifier is shown on diagram 1 A detailed block Inputs stage 1 the X INPUT noninverting bnc diagram identifying each major stage of the Horizontal connector J10 2 the X INPUT inverting bnc connector X Amplifier is superimposed on the schematic with J20 and 3 the ALTERNATE INPUTS noninverting wide shaded lines to conveniently locate the components cannon connector J25 Theory of Operation 6068 HORIZONTAL x AMPLIFIER VERTICAL v AMPLIFIER DYNAMIC FOCUS ALTERNATE INPUTS HSV TTL BLANKIN
124. nce signal Dc to at least 3 MHz at 3 dB point Risetime 116 nsec or less Settling time input attenuators in 1X position After deflection between any two points on screen Spot must reach new writing position within 0 012 cm 0 005 inch within 500 ns After deflection to any point on screen from within 10 cm of screen center Spot must reach new writing position within 0 012 cm 0 005 inch within 700 ns Phase Difference Dc to 500 kHz f less between X and Y amplifiers X and Y amplifier gain must be set for the same deflection factor Volts Div REV JAN 1982 Tine 1 7 General Information 6068 TAB LE 1 3 CONT Electrical Characteristics Characteristic Performance Requirement Common Mode Rejection Attenuator 1X 3 volts peak input DC to 500 kHz At least 100 1 500 kHz to 1 MHz At least 40 1 Attenuator 5X 15 volts peak input DC to 500 kHz _ At least 40 1 Input Impedance 1 within 196 or 50 within 196 paralleled by 47 pF or less Maximum Nondestructive Input Voltage fault condition only 1 MQ Input Impedance 100 V dc peak ac Input Impedance _ 8 V dc peak ac Dynamic Range At least 1 5 screen diameters from screen center 10 cm Position Range Spot may be positioned anywhere on screen with no signal input Position Stability 0 1 cm or less drift per
125. ne at the top and bottom of the icul ithin O 1 division b Refer to Section 6 Instrument Options and the greuieujs within ires Change Information at the rear of this manual for any modifications which may affect this procedure c See TEST POINT AND ADJUSTMENT LOCATIONS ang CHECK GEOMETRY INTERNAL CONTROL AND SELECTOR LOCATIONS foldout NOTE pages in Section 8 Diagrams and Circuit Board If the preceding step was not performed first Illustrations p g step p perform Step B1 then proceed d Set 6068 controls 83 SETUP CONDITIONS INTENSITY enlace ate tre Visible display Vertical and Horizontal Midrange Make changes to ithe control settings FOGUS Well defined display 6068 Rear Ramp Generator Panel Ramp Out B2 CHECK ORTHOGONALITY NOTE bnc Cable Perform step B1 then proceed Test Equipment Controls Ramp Generator Ramp Signal Triggering D EUN Amplitude provide 8 div deflection 2821 57 2821 72 B2 SETUP CONDITIONS 6068 Controls Make no changes to the control settings a Position the trace to the left edge of the graticule and 606B Rear Ramp Generator then to the right edge Panel Ramp Out b CHECK the vertical trace for 0 1 division or less of bowing at the left and right edges of the graticule bnc Cable Test Equipment Controls Ramp Generator Ramp Signal Triggering Amp
126. neck of the crt into the shield 3 Mount and fasten the bezel and implosion shield to the front panel with the 2 bezel securing screws NOTE Align the extender shafts with the appropriate holes in bezel 4 Place the crt base pin socket onto the crt base pins 5 Install the socket cover 5 Position and secure the rear cover 6 Connect the 6 leads to the proper crt neck pins NOTE The replacement crt will require that the Monitor be readjusted Refer to Section 5 Calibration 4 9 Maintenance 606B CIRCUIT BOARD REPLACEMENT If a circuit board is damaged beyond repair the entire assembly including all soldered on components can be replaced Part numbers for the completely wired boards are given in Section 7 Replaceable Electrical Parts A1 X Y Output Amplifier Board Removal Remove the A1 X Y Output Amplifier board as follows refer to Figure 4 5 1 Remove the shield 2 Remove the 2 Transistor Retaining Blocks and 4 fish paper insulation strips 3 Unsolder the 8 transistors noting the location of each These transistors are not shipped as part of the board assembly HARMONICA P290 4 Unplug the 2 pin Harmonica P290 and 4 individual pins connected to the crt deflection plates 5 Position the instrument on its right side 6 Remove 8 Transistor Retaining Screws 1 board mounting screw and 1 threaded spacer post 7 Pry up with fingers on the board near the interboard connector When th
127. ned in other sections of this manual should be used in conjunction with the following data to aid in locating a defective component An understanding of the circuit operation is helpful in locating troubles See Section 3 Theory of Operation for this information TROUBLESHOOTING AIDS DIAGRAMS Complete schematic diagrams are located on the foldout pages in Section 8 Diagrams and Circuit Board illustrations The component number and electrical value of each component in this instrument are shown on these diagrams See the first page of the Diagrams and Circuit Board Illustrations section for definitions of the reference designators and symbols used to identify components in this instrument Important voltages and numbered waveform test points are aiso shown on the diagrams Corresponding numbered waveforms are located adjacent to each diagram The portions of circuits mounted on circuit boards are enclosed with heavy solid black lines Each schematic diagram is divided into functional stage blocks as indicated by the wide shaded lines These functional blocks are described in detail in Section 3 Theory of Operation CIRCUIT BOARD ILLUSTRATIONS A circuit board location illustration appears on the back of the foldout page facing the schematic diagram in addition an illustration of the circuit board is included here to identify the physical location of the components and waveform test points that appear on the schematic diagram Ea
128. nnected in a differential configuration For ease of explanation only the side will be discussed Transistors 0100 0120 0130 0140 0150 0160 0170 and Q180 are the active components of the X operational amplifier Feedback is provided through R174 and C174 to the emitter of Q100 Transistor Q115 provides additional emitter current to Q100 This current varied by R119 X Plate DC Level determines the dc voltage output level The signal from the X Preamplifier stage is amplified by Q100 and fed through emitter followers 0120 0130 to a cascode driver Q140 Complimentary amplifiers Q150 Q160 provide the final gain for the X Output Amplifier signals with emitter followers 0170 0180 supplying the high current to drive the capacitive load of the crt plates The capacitance between the mounting tabs of transistors Q150 Q160 and the metal work circuit board and chassis is minimized by driving a metal shield to which Q150 Q160 are mounted with the current output of emitter followers 0170 0180 The X GAIN control R104 provides a fine gain adjustment of at least 10 of the 8 cm deflection This control in conjunction with R129 X Gain internal screwdriver adjust on the Pre Amplifier board is normally set to a nominal 1 volt for 8 divisions of deflection step attenuator in the 1X position Potentiometer R109 Output Amplifier Gain is provided to match the X Output Amplifier gain to the crt sensitivity and not to alter the d
129. nstrument on all sides by tightly includes slide out assembly and securing hardware 1 dunnage urethane foam between the carton Complete rackmounting instructions are included with i and the instrument allowing three inches on all sides each kit H 5 Seal the carton shipping tape or with RACKMOUNT TO CABINET CONVERSION U industrat stapler Tektronix Part 040 0602 XX Converts one 606B Monitor from a rackmount configuration to abinet 77787 Mar the address of t the Tektronix Service Center and configuration Complete instructions are included in each your return address on the carton in one or more kit puig soraspseminant locations Roc REV A MAY 1980 157 General information 606B TO INSTALL FULLY EXTEND THE SLIDE OUT TRACK INTERMEDIATE SECTIONS THE TRACKS WILL LOCK WHEN FULLY EXTENDED INSERT THE INSTRUMENT CHASSIS SECTIONS INTO THE INTERMEDIATE SECTIONS PRESS STOP LATCHES AND PUSH INSTRUMENT TOWARD RACK UNTIL THE LATCHES SNAP INTO THEIR HOLES AGAIN PRESS STOP LATGHES AND PUSH INSTRUMENT INTO RACK 5 SECURE THE INSTRUMENT JN PLACE WITH THE FRONT PANEL SECURING SCREWS TO REMOVE REMOVE THE FRONT PANEL SECURING SCREWS PULL THE INSTRUMENT OUTWARD UNTIL THE STOP LATCHES SNAP INTO THE HOLES PRESS STOP LATCHES AND REMOVE THE INSTRUMENT 2821 15 Figure 1 2 Installing and removing a rackmo
130. nt Panel And Check 5 34 4 Check Adjust Geometry R185 5 34 C HORIZONTAL X 5 35 1 Horizontal X Amplifier Preliminary Setup 5 35 2 Adjust X Output Dc 5 35 3 Adjust X Amplifier Gain R104 R109 R129 And Check 5 36 4 Adjust X Amplifier Compensation C106 C108 C179 R103 And Examine Scan Limiter 5 Check Horizontal Settling Time 6 Check Horizontal Bandwidth 5 38 7 Adjust Horizontal X Attenuation Compensation C103 C107 And Check Horizontal input 5 39 8 Check Horizontal X Common Mode Rejection 1X 5X Atten c c 5 40 5 28 PAGE VERTICAL Y AMPLIFIER 5 41 1 Vertical Y Amplifier Preliminary Setup 5 41 2 Adjust Y Amplifier Gain R204 R209 R229 And Check Positioning 5 41 3 Adjust Y Amplifier Compensation C206 C208 C279 And Examine Scan Limiter 5 42 4 Check Vertical Settling Time 5 43 5 Check Vertical 5 44 6 Adiust Vertical Y Attenuator Compensation C203 C207 And Check Vertical Input Attenuation 5 44 7 Check Vertical Y Common Mode Rejection 1X 5X Atten 8 Check t
131. nt and Performance Check A6 EXAMINE 95 V SUPPLY NOTE If the preceding step was not performed first perform step A1 then proceed A6 SETUP CONDITIONS 6068 Controls Make no changes to the contro settings 606B Monitor Test Equipment Controls DVM Digita Voitmeter Range Function 2821 53 a Connect the DVM between the 95 V test point TP351 and ground TP353 b EXAMINE For a voltmeter reading within the range given in Table 5 5 A7 ADJUST 5400 V SUPPLY NOTE If the preceding step was not performed first perform step A1 then proceed A7 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear DC Voltmeter Test Equpment Controls De Voltmeter Range Function 5 32 a Turn off the 606B POWER b Remove the rear cover see Fig 4 4 in Maintenance Section and locate the test port in the crt socket cover assembly c Connect the DC Voltmeter between V50 crt pin 2 accessable through test port and ground d Turn on the 606B POWER e EXAMINE For a voltage reading between 5350 and 5450 t ADJUST R295 HV Adj for a voltage reading of approximately 5400 volts 9 EXAMINE For no movement of the 5400 V Supply when the INTENSITY is varied CAUTION A high intensity spot or slow scanning display will damage the crt phosphor Be sure the display is positioned off screen while examining for no movement of the 5400 V Supply h Turn
132. o grid The remainder of the components provide circuit protection in the event of a high voltage arc or other malfunction FOCUS ELEMENT DC RESTORER The Focus Element DC Restorer stage couples the dc and low frequency components of the Dynamic Focus correction signals diagram 4 to the crt focus element of V50 This allows the Dynamic Focus circuit to control the focus element potential The potential difference between the Dynamic Focus output and the focus element prohibits direct coupling The Focus Element DC Restorer stage is divided into 2 sections for ease of explanation The first section can be considered a modulator at low voltage potentials and the remaining section a demodulator at high voltage potentials Modulator When the secondary winding output at T200 pin 16 swings positive C111 charges through C215 R215 and R220 to a voltage level determined by the output level from the Focus Output Amplifier stage of the Dynamic Focus circuit diagram 4 At this voltage level approximately 15 volts for center screen deflection CR217 conducts preventing any additional increase in positive voltage across C111 When the secondary winding output swings negative CR217 turns off Then CR218 conducts and clamps the negative excursion at 3 10 C111 a diode drop below ground The result is a square wave output from the Modulator with the output amplitude determined by the difference between the level of the Dynamic Foc
133. oard on diagram 5 Fuse F310 provides circuit protection in the event of an overload 18 VOLT UNREGULATED SUPPLY The 18 Volt Unregulated Supply provides the 18 volt unregulated power for the Converter Board Fuse F325 provides circuit protection in the event of an overload 15 VOLT REGULATED SUPPLY The 15 Volt Regulated Supply in addition to providing power to circuitry throughout the instrument provides a reference voltage source for all other power supplies The regulator for the 15 volt Regulated Supply is a feedback amplifier system that operates between ground and the 18 Volt Unregulated Supply Current to the load is delivered by series pass transistor Q350 which is located in the output side of the supply The supply voltage is established by the drop across resistive divider network R335 R337 R339 The feedback through this network is compared to the reference level established at the base of Q320 by the voltage drop across VR327 Any variation in output voltage of the supply due to ripple change of current through the load etc is immediately transmitted to the base of Q350 and cancelled by a change in Q350 conduction maintaining a steady output Theory of Operation 606B The output of the supply is set to exactly 15 volts by adjustment of R337 the 15 V Adjust Transistor Q340 protects the 15 volt series regulator Q350 if excess current is demanded from this supply Essentially all current from this su
134. of machine inserted components easier straighten the leads of the component on the back of the circuit board using a small screwdriver or pliers while heating the soldered connection 4 Bend the leads of the replacement component to fit the holes in the circuit board if the component is replaced while the board is mounted in the instrument cut the leads so they will just protrude through the board Insert the leads into the holes in the board so that the component is firmly seated against the board or as originally positioned 5 Touch the iron to the connection and apply enough solder to make a firm solder joint 4 8 6 Cut off any excess lead protruding through the board if not clipped in step 4 7 Clean the area around the solder connection with a flux removing solvent Be careful not to remove information printed on the circuit board COMPONENT REMOVAL AND REPLACEMENT WARNING To avoid electric shock always disconnect the Monitor from the power source before replacing components The exploded view drawings associated with the Replaceable Mechanical Parts list located at the rear of this manual may be helpful in the removal or disassembly of individual components or sub assemblies CATHODE RAY TUBE REMOVAL Remove the cathode ray tube crt as follows see Fig 4 4 Use care when handling a crt Breakage of the crt causes a high velocity scattering of glass fragments implosion Protective clothin
135. ories page at the rear of this Manual 1 12 General Information 606B i1 6p Siv 6L SHU313WILN3O NI SYASWNN WOLIlOS SSHONE NI SH38WRN LON 69Z EL ut amp 772 iz Sg 8 Figure 1 3 606B Dimensional Drawing 1 13 Section 2 6068 OPERATING INFORMATION To operate this instrument effectively the user must become familiar with the operation and capabilities of the instrument This section contains preliminary operating information a description of front and rear panel controls connectors and indicators and a checkout procedure Detailed operating information and typical applications are included in this section AMBIENT TEMPERATURE CONSIDERATIONS This instrument can be operated where the ambient air temperature is between O and 50 C and can be stored in ambient temperatures between 40 and 70 C After being stored in temperatures beyond the operating limits allow the chassis temperature to return to within the operating limits before applying power Allowing the Monitor to operate at an ambient temperature substantially higher than that specified may result in poor reliability as well as inaccurate performance When the 6068 is mounted in a rack with other equipment do not allow the temperature surrounding the monitor to exceed 50 C Additional clearance or forced ventilation methods fan may be necessary to maintain ambient temperatures
136. ove the board 7 To install the board reverse the removal procedure 5 High Voltage Board Remove the High Voltage Board as follows refer to Fig 4 9 1 Remove the metal shield 2 screws 2 Remove the plastic high voltage shield remove 3 nylon screws 3 Unplug ali harmonica connectors 4 4 Unsolder the 0 01 uF Capacitor from the High Voltage Board Pry up on the board near the Interboard Connector Remove the board 6 Remove the plastic Lexan shield from the board HARMONICAS 7 To install the board reverse the removal procedure A6 Dynamic Focus Board Remove the Dynamic Focus board as follows refer to Fig 4 10 1 Remove the Plastic Shield 2 Unplug all harmonica connectors 3 Remove the Transistor Retaining Block and insulating fish paper 4 Remove 2 board mounting screws and 2 Threaded Spacer Posts 3 16 wrench 5 Remove the board 6 To install the board reverse the removal procedure TRANSISTOR RETAINING BLOCK PLASTIC SHIELD 2 HARMONICAS 2 PIN THREADED SPACER POSTS 2 A MR EE SCREWS 2 P SN EM 22 i ME DYNAMIC FOCUS amp FRONT PANEL CONTROL BOARD HARMONICA 10 PIN 2821 23 Figure 4 10 A6 Dynamic Focus and Front Panel Control board removal 4 14 REV A MAY 1980 SEMICONDUCTORS Semiconductors should not be replaced unless actually defective If removed from their
137. oximately 70 V above the level of visible cutoff Measured at crt grid Acceleration Potential 5 4 kV within 1 Light Output quality area Light Output Uniformity quality area Greater than 20 upW cm using a 700 line 60 Hz refresh raster with a 10096 duty cycle Maximum allowable drive to the crt When screen is flooded using raster method and light output is at least 10 of maximum light output will vary less than 2 cm and vary less than 10 over the entire quality area Defects The following definitions apply to measuring screen defects LENGTH The maximum linear dimension in any direction across the defect in question WIDTH The maximum linear dimension perpendicular to the length Quality Area 1 Any number of defects less than 5 mils in both width and length 2 No defects with length plus width exceeding 20 mils except when the width is less than one mil 3 Any number of defects with width less than one mil 4 No more than five defects greater than one mil in width greater than five mils in length and with length plus width equal to or less than 20 mils No two such defects can be within one centimeter of each other Outside Quality Area Not more than three holes with length plus width equal to or more than 25 mils POWER SOURCE LO Line Voltage Range L 100 V ac 90 to 110 V ac M 110 V ac 99 to 121 V ac H 120 V ac 108 to 132 V ac HI
138. p Generator 4 Calibration Generator 5 Sine Wave Generator 9 Test Oscilloscope with 10X probe 10 Function Generator Equipment Required Numbers correspond to those listed in Table 5 3 Test Equipment 11 Dual input coupler 12 50 Q terminator 14 10X Attenuator 15 50 ohm bnc cables 3 required E1 Z AXIS AMPLIFIER PRELIMINARY SETUP a Perform the Performance Check Power Up Sequence given at the beginning of Part I Performance Check b Refer to Section 6 instrument Options and the Change Information at the rear of this manual for any modifications which may affect this procedure See TEST POINT AND ADJUSTMENT LOCATIONS and INTERNAL CONTROL AND SELECTOR LOCATIONS foldout pages in Section 8 Diagrams and Circuit Board illustrations d Set 6068 controls TENSITY eoe yep Dianin Visible display Vertical and Horizontal Position Midrange FOCUS erase ener ER Well defined display E2 CHECK ABERRATIONS NOTE Perform step El then proceed E2 SETUP CONDITIONS 8068 Controls Make no changes to the contro settings Test Oscilio scope 6068 Rear Panel Vertical Input Fast Rise Out 10X Probe Test Equipment Controls Calibration Generator Output Dess fast rise Period 10 us 100 kHz Test Oscilloscope Deflection Factor 10 V Div Sweep Rate Tus Input Coupling e o RO aaa ccc
139. parate focus corrections on each side of the screen The output from the X Absolute Value Amplifier stage is fed to the Stigmator 1 Correction Shaper 0150 0160 the Stigmator 2 Correction Shaper and Mixer and the Focus Correction Shaper and Mixer stages Y ABSOLUTE VALUE AMPLIFIER The differential output current from the Y Focus Correction Pickoff is fed through P150 pins 4 3 to the Y Absolute Value Amplifier of which Q120 and Q130 are the active components The Y Absolute Value Amplifier converts the differential Y pickoff current from the X Y Pre Amplifier Board to alternate on outputs when CR120 is on CR130 is off and vice versa This allows implementation of separate focus corrections on the top and bottom of the screen nempe 5 Figure 3 2 Simplified illustration of geometric defocusing 3 6 The output from the Y Absolute Value Amplifier stage is fed to the Stigmator 1 Correction Shaper U150 U160 the Stigmator 2 Correction Shaper and Mixer and the Focus Correction Shaper and Mixer stages STIGMATOR 1 CORRECTION SHAPER The Stigmator 1 Correction Shaper provides independent gain control of the X times Y function of the crt trace at each corner of the screen Information from the X and Y Absolute Value Amplifiers is processed by U150 multiplier I C for the top half of the screen and U160 multiplier 1 for the bottom half of the screen
140. pecification applicable under fault condition only therefore this is not a procedural check Position Range i Spot can be positioned anywhere on the screen D2 Check Positioning and Gain D2 Adjust Y Ampiifier Gain and Check Positioning TABLE 5 2 CONT Performance Check Summary Calibration 606B Characteristic Performance Requirement Part Performance Check Procedure Title Part ll Adjustment and Performance Check Procedure Title Dynamic Range At least 1 5 screen diameters from screen center 10 cm Position Stability 0 1 cm or less drift per hr after 20 minute warmup E Gain Stability Less than 196 change under all conditions of line voltage and temp erature Crosstalk Between X and Y Amplifiers 0 005 cm 0 002 inch or less of deflection on the undriven channel with full screen amplitude of 1 MHz sine wave applied to the other channel Other inputs grounded or terminated into 50 From Z to Y Amplifier 0 012 cm 0 005 inch or less of deflection on the undriven channels when the Z Axis Amplifier is driven for a 70 V output with a 1 MHz sine wave X and Y inputs grounded or terminated into 50 Q Does not normally require customer verification Z AXIS AMPLIFIER Gain Range Internally adjustable to allow 0 5 V to 2 5 V at the input connector to generate maximum allowable voltge swing at the cr
141. plete or partial calibration procedures Also refer to Using These Procedures for more detailed information TABLE 5 1 Calibration Procedure Electives Electives Procedures Functional Check 1 A functional check only is provided in the Checkout Procedure in section 2 2 A functional check is also accomplished by performing Part li Adjustment and Performance Check Performance Check Only Perform Part I Performance Check Complete Calibration Perform Part ll Adjustment and Performance Check Partial Procedures Proceed to the desired step s e g A2 A3 B2 B3 etc as listed in the Index to part I Performance Check or index to Part ll Adjustment and Performance Check NOTE When adjustments are made we recommend that the entire major functional circuit procedure be performed Calibration 606B USING THESE PROCEDURES NOTE In these procedures capital letters are used within the body of the text to dentify front panel controls indicators and connectors on the 6068 e g FOCUS Initial capitalization is used to identify all the associated test equipment and their controls indicators and connectors e g Amplitude used in the procedures Initial capitalization is also used to identify internal adjustments of the 606B e g X Plate DC Level These procedures are divided into subsections by major functional circuits e g A Power Supplies B Crt etc The order in whi
142. plifier is a feedback amplifier consisting of 0440 0450 0460 0470 0480 0490 The feedback network consists of R492 R493 C492 C493 with C492 and C493 supplying high frequency compensation The input signals are combined at the bases of emitter followers 0440 0450 and fed to complimentary amplifiers 0460 0470 Transistors 0460 0470 provide the final gain with complimentary coupled emitter followers 0480 0490 supplying the high current necessary to drive the capacitive load 3 8 e CONVERTER AND HIGH VOLTAGE POWER SUPPLY The Converter and High Voltage Power Supply provides the voltage levels and control circuits necessary for operation of the deflection system and the cathode ray tube crt A schematic diagram of the Converter and High Voltage Power Supply is shown on diagram 5 A detailed block diagram showing each major stage of this circuit is superimposed on the schematic diagram with wide shaded lines The stage names given as sub headings in the following discussion can be found in the shaded boxes on diagram 5 CONVERTER OSCILLATOR The Converter Oscillator uses an external resistance R124 R125 to establish a constant charging current into C121 Capacitor C121 provides a linear ramp voitage used as a reference for the comparator The comparator then couples the information from the Error Amplifier to the Converter Base Drive circuit The discharge time of C127 Converter Base Drive stage determines the minimum pulse w
143. pply flows through R351 When excess current is demanded from the 15 volt series regulator due to a short circuit or similar malfunction at the output of this supply the voltage drop across R351 increases enough to turn on Q340 The resulting current through Q340 reduces the conduction of Q350 to limit the supply current to a safe level Fuse F315 provides circuit protection in the event of an overload long term or regulator malfunction 15 VOLT REGULATED SUPPLY The regulator for the 15 Volt Regulated Supply consists of series pass transistor Q390 and error amplifier Q360 Q370 Q380 This is a feedback amplifier system similar to that just described for the 15 Volt Regulated Supply The center of resistive divider network R377 R379 is set by the error amplifier to be zero volts with respect to ground during normal operation Any variation in output from the 15 Volt Regulated Supply is coupled to the error amplifier which changes the bias of the 15 volt series regulator Q390 This change in bias and resulting change in conduction of the regulator cancels the output variation to maintain a steady level from the supply Diode CR385 protects the 15 voit series regulator 0390 if excess current is demanded from this supply Essentially all current from this supply flows through R390 When excess current is demanded from the 15 volt series regulator due to a short circuit or similar malfunctionat the output of this supply the
144. r circuits The nature of the interaction is described Calibration 606B TABLE 5 2 CONT Performance Check Summary Characteristic Performance Requirement Part fl Adjustment and Performance Check Procedure Title Part Performance Check Procedure Title HI Line Voltage Range L 200 V ac 180 to 220 V ac M 220 V ac 198 to 242 V ac o H 240 V ac 216 to 250 V ac Does not normally require customer verification Line Frequency 48 to 440 Hz Power Consumption Maximum 75 W 120 V ac 60 Hz Nominal 50 W 120 V ac 60 Hz CATHODE RAY TUBE Quality Area 7 9 Does normally require customer verification Geometry Bowing or tilt 1 mm or B3 Check Geometry B4 Check Adjust Geometry Orthogonality less over the full screen R185 R185 90 within 0 7 82 Check Orthogonality B3 Check Orthogonality Compression and Expansion Less than 196 of fuil screen deflection Does not normally require customer verification Spot Diameter Spot Shape Spot Growth 0 079 cm 0 0031 in or less with intensity set for 3 45 JW cm P31 700 iine 7 x 9 cm focused raster Measured with the shrinking raster method 125 lines cm center screen F2 Check Spot Diameter F5 Check Spot Diameter Measured within the quality area The ratio between two perpendicular spot crossections does not exceed 1 5 1 No
145. rned off and a ringing effect results due to the energy stored in the LC tank Diode CR190 turns on then off after CR190 turns off diode CR180 turns on then off again When CR180 turns off transistor Q190 turns on and pulls energy back through the transformer T200 DEFLECTION VOLTAGE SUPPLIES The Deflection Voltage Supplies stage provide 95 volts 250 volts and 300 volts for the monitor 95 Volts The ac voltage from pins 18 and 20 of T200 is rectified by CR205 CR206 filtered by L205 C205 and fed to the circuit locations indicated on the schematic REV A MAY 1980 Theory of Operation 6068 250 Volts The ac voltage from pins 22 and 16 of T200 is rectified by CR201 CR202 filtered by L201 CL201 and fed to the circuit locations indicated on the schematic 300 Volts The ac voltage from pin 15 of T200 is rectified by CR209 and filtered by C209 before being applied to the H V Regulator H V REGULATOR The H V Regulator provides a small feedback voltage to the input of the 4X multiplier to keep its output to a Specified limit The converter transformer T200 provides a 1300 volt peak signal to the 4X multiplier The 4X multiplier consists of C67 CR171 CR173 CR177 CR179 C173 C162 and C171 Filtering of the resultant 5400 volts is provided by R156 C152 C162 and the regulator loop The 5400 volts is sampled at R127D and fed to the input of U280 through P400 9 The voltage at P400 9 is adjusted to approx
146. rt 103 0030 00 5 50 ohm Termination Description Impedance 50 ohm connectors bnc Type Used Tektronix Part 011 0049 01 5X Attenuator o Description Impedance 50 ohm connectors bnc Type Used Tektronix Part 011 0060 02 PRELIMINARY SET UP 1 Install the function generator in the power module and turn on the power module 2 Connect the 606B power cord to a compatible power source NOTE Check the line voltage information recorded on the rear panel If the source voltage is not within this range refer to the servicing information sections of this Manual REV A MAY 1980 3 Set the front panel controis as follows Vertical and Horizontal Position midrange INTENSITY sius fully counterclockwise FOCUS ited ae midrange ONZOFE eR E Tus ON pushbutton in 4 Allow at least one minute for the instrument to warm up 5 Proceed to the functional check procedure DISPLAY FUNCTIONS 1 Perform the Preliminary Set Up procedure 2 Notice that a spot will appear on the crt increasing in brightness as you slowly turn the INTENSITY control clockwise NOTE A high intensity level combined with a stationary spot will damage the crt phosphor Therefore set the INTENSITY control to the minimum necessary for good visibility 3 Adjust the FOCUS control for a sharp well defined display Final focus adjustment must be made with a magnifier or microscope to guarantee resolution
147. scribes which adjustment to make and the desired result We recommend that adjustments not be made if a previous CHECK or EXAMINE instruction indicates that no adjustment is necessary 4 and reference is made to the step s affected PERFORMANCE CHECK SUMMARY Table 5 2 Performance Check Summary lists electrical specifications that are checked in Part and Part il of this section Table 5 2 is intended to provide a convenient means for locating the procedures in Part and Part ll that check and or adjust the instrument to meet the applicable electrical specifications For example if the Z Axis Amplifier had been repaired use Table 5 2 to locate the electrical specifications affected by the repair Then note the title of the procedure in Part or Part Il in which those specifications are checked and or adjusted Use the index provided at the front of Part and Part 1 to determine the page number of the desired procedures TABLE 5 2 Performance Check Summary Characteristic Performance Requirement Part Performance Check Procedure Title Part 11 Adjustment and Performance Check Procedure Title POWER SOURCE LO Line Voltage Range L 100 V ac 90 to 110 V ac M 110 V ac 99 to 121 V ac H 120 V ac 108 to 132 V ac Does not normally require customer verification 5 2 INTERACTION indicates that the adjustment described in the preceding instruction interacts with othe
148. sockets during routine maintenance return them to their original sockets Unnecessary replacement of semiconductors may affect the adjustment of the instrument When semiconductors are replaced check the operation of circuits which may be affected Always disconnect the Monitor from the power source before replacing components to avoid electrical shock hazard Replacement semiconductors should be of the original type or a direct replacement Lead configurations of the semiconductors used in this instrument are shown in Figure 4 2 Some plastic case transistors have lead configurations which do not agree with those shown If a replacement transistor is made by a different manufacturer than the original check the manufacturer s basing diagram for correct basing All transistor sockets are wired for the standard basing as used for metal cased transistors ARNING Handle silicone grease with care Avoid getting silicone grease in your eyes Wash hands thoroughly after use When removing soldered in transistors use solder removing wick to remove the solder from the circuit board pads Transistors which have heat radiators or are mounted on the chassis use silicone grease to increase heat transfer Replace the silicone grease on both sides of the insulator plate and on the metal tab if the transistor has one when replacing these transistors INTERCONNECTING CIRCUIT BOARD PIN REPLACEMENT A circuit board pin replacement kit
149. ssories and packaging for shipment instructions ot available options an dosons of incorporated information for those Section 2 Operating Instructions contain information relative to operating and checking the in operation edtrical Parts contains le amp trical functions of the assemblies related to 1 instrument eo Section 3 Instrument Options contains a d scriptien of available options and gives the location of t incorporated information for those options ection 8 Diagrams ahd Circ it Board jllussrationg includes detailed circuit Sch matics locations of assembled boards within instrument voltage and waveform information eircuit board component logators and locationis f adjustments to aid in the of the Adjdstmenit and Performance Check portion of the Calibr tion procedure SERVICE MANUAL The Service Manual contains instructions for Section 9 Replaceabl Mechanical Parts includes 9 infermation necesS ry to order replaceable servicing unless you are Bie to do Section 1 General Information contains instrument description electrical specifications environmental characteristics standard and recommended accessories installation and packaging for shipment instructions INSTRUMENT DESCRIPTION Section 2 Operating Instructions contains information on instrument installation front and rear panel controls connec
150. stment and Performance Check PART II ADJUSTMENT AND PERFORMANCE CHECK The following procedure Part lI Adjustment and Performance Check provides the information necessary to 1 verify that the instrument meets the electrical specifications 2 verify that the controls function properly and 3 perform all internal adjustments Part I Performance Check verifies that the instrument meets the electrical specifications without making internal adjustments All tolerances given are as specified in the Specification tables section 1 in this manual A separate Checkout Procedure is provided in section 2 for instrument familiarization and also to verify that the controls function properly See Table 5 1 Calibration Procedure Electives at the beginning of this section for information on performing a Partial Part Adjustment and Performance Check Procedure INDEX TO PART 1 ADJUSTMENT AND PERFORMANCE CHECK PAGE A POWER SUPPLIES 1 dicil era 5 30 1 Power Supplies Preliminary Setup 5 30 2 Adjust 15 V 5 30 3 Examine 15 V Supply 5 30 4 Adjust 250 V Supply 5 31 5 Adjust Freq R124 soore reon errimari eres 31 6 Examine 95 V 32 7 Adjust 5400 V Supply 5 32 1 Crt Preliminary Setup dixi 2 Adjust Crt Grid Bias R245 5 33 3 Adjust Trace Align R290 Fro
151. stments are required under normal conditions RACKMOUNTING INFORMATION w fs i wt SLIDE OUT TRACK LUBRICATION The 606B can be operated in a standard 19 inch The special finish on the sliding surfaces of the tracks instrument rack with front and rear holes that conform to provides permanent lubrication However if the tracks universal hole spacing Kits are available to convert the require additional lubrication a thin coat of paraffin can 606B from the cabinet to a rackmounted configuration ba rubbed onto the Sliding surfaces and vice versa Complete instructions are included in the kits A brief description of each available conversion kit is given here Consult your Tektronix Field Office or representative for additional information INSTRUMENT PACKAGING CAUTION Us oM nv 000 09 7f the instrument is to be shipped to a Tektronix Service Reliability and performance of the 606B will be Center for service or repair attach a tag showing the followings Owner with address and the name of an individual at your firm who can be contacted complete instrument type and serial number and description of the we S amp rvice required affected if the ventilation holes in the protective panels are obstructed Forced ventilation methods will be needed if the 6068 is operated at an ambient temperature higher than 50 see Ambient Temperature Considerations in Section 2 of this manual NES CABI
152. sure the best heat transfer to the solder joint Apply only enough heat to remove the component or to make a good solder joint To protect heat sensitive components hold the component lead between the component body and the solder joint with a pair of long nose pliers or an alligator clip Use a solder removing wick to remove excess solder from connections or to clean circuit board pads The following technique should be used to replace a component on any of the circuit boards in this instrument Most components can be replaced without removing the board s from the instrument 1 Touch the soldering iron to the lead at the solder connection Never place the iron directly on the board as this may damage the board 2 Melt a small amount of solder onto the component lead connection This replaces the flux which may have been removed during instrument cleaning and facilitates removal of the component 3 Grip the component lead with a pair of long nose pliers When the solder begins to flow gently pull the component lead from the board If unable to separate the lead from the board try removing the other end of the component NOTE Some components are difficult to remove from the circuit board due to a bend placed in each lead during machine insertion of the component The purpose of the bent leads is to hold the component in position during a flow solder manufacturing process which solders all components at once To make removal
153. sweep Mibrate 15 minutes in each of the 3 major axes at 0 025 inch total displacement Hold 3 minutes at any major resonance or REV A MAY 1980 fione at 50 Hz Total time 54 minutes 1 71 General Information 606B TABLE 1 4 CONT Environmental Characteristics Characteristic Information Shock 50 g 1 2 sine 11 ms duration 2 shocks in each direction along 3 major axes for a total of 12 shocks Transportation Qualified under National Safe Transit Committee Test Procedure Category Il Humidity Class 5 Test to MIL STD 810C method 507 1 procedure IV modified and specified in MIL T 28800B Par 4 5 5 1 1 2 Operating 50 C 90 to 9596 R H Nonoperating 60 C 90 to 9596 R H TABLE 1 5 Physical Characteristics Characteristic Information Weight Approximately 17 5 Ibs Overall dimensions See 606B Dimensional Drawing Figure 1 3 STANDARD ACCESSORIES i RASS I Ie ae A OU Mohan Operators Manual S oneris aros viden eii aa nq eio Vel e e sa Dee SIR IA Service Manual UE ENERO REC Internal Lined Graticule 8 x 10 division E muc Meakin VEA Detachable Power Cord Un Meant eee EX a taedet aene Connector Receptacle 25 pin Male For more detailed information refer to the tabbed Access
154. t Scale Do not exceed the voltage rating of the capacitor The resistance reading should be high after initial charge of the capacitor open capacitor can best be detected with a capacitance meter or by checking if the capacitor passes ac signals 8 REPAIR AND READJUST THE CIRCUIT If any defective parts are located follow the replacement procedures given under Component Replacement in this section Check the performance of any circuit that has been repaired or that has had any electrical components replaced Adjustment of the circuit may be necessary CORRECTIVE MAINTENANCE Corrective maintenance consists of component replacement and instrument repair Special techniques required to replace components are given here OBTAINING REPLACEMENT PARTS Most electrical and mechanical parts can be obtained through your local Tektronix Field Office or representative However many of the standard electronic components can be obtained locally Before ordering or purchasing a part from a source other than Tektronix Inc check the electrical parts list for the proper value tolerance rating and description Some parts are manufactured or selected by Tektronix Inc to satisfy particular requirements or are manufactured for Tektronix Inc to our specifications NOTE When selecting replacement parts remember that the physical size and shape of a component may affect its performance in the instrument All replacement parts shou
155. t rating and current rating fst for your product and which is identical in type voltage DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES _ To avoid explosion do not operate this product in an atmosphere of explosive gases unless it has been specifically certified for such operation s DO NOT SERVICE ALONE on Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present b USE CARE WHEN SERVICING WITH POWER s Dangerous voltages exist at several points in this product To avoid personal injury do not touch exposed connections and components while power is on Disconnect power before removing protective Lote ding or replacing components CRT HANDLING Use care when handling a crt Breakage of the crt causes a high velocity scatteting of glass fragments implosion Protective clothing and safety glasses should be worn Avoid striking the crt on any object which might cause it to crack or implode When storing a crt place it protective carton or set it face down in a protected location a smooth surface with a soft mat under the faceplate T BO bem o CRT IMPLOSION SHIELD Do not operate the instrument without the proper implosion shield installed SILICONE GREASE HANDLING E Y Handle silicone grease with care Avoid getting the silicone grease your eyes Wash hands thoroughl a
156. t control grid V to 70 V Does not normally require customer verification Bandwidth Dc to 5 MHz at 3 dB point Check Z Axis Amplifier Bandwidth E4 Check Z Axis Amplifier Bandwidth Risetime 35 ns or less Does not normally require customer verification Aberration 5 or less E2 Check Aberrations i i i i Adjust Z Axis Compensation and Check Aberrations REV A MAY 1980 5 7 Calibration 606B TABLE 5 2 CONT Performance Check Summary Characteristic Performance Requirement Part 1 Performance Check Procedure Title Part il Adjustment and Performance Check Procedure Title Common Mode Rejection At least 100 1 with input signals up to 5 V p p at any gain setting Dc to 100 kHz E4 Check Z Axis Common Mode Rejection E5 Check Z Axis Common Mode Rejection 1 MQ within 1 or 50 Q within 1 paralleled by 47 pF or less Input Impedance 1 MQ input impedance 100 V dc peak ac 50 Q input impedance 5 Vor 5 V dc peak ac Maximum Non Destructive Input Voltage fault i condition only Does not normally require customer verification TTL input Logic input blanks or unblanks Crt to level set by front panel INTENSITY control and Z axis input voltage HI 24 to 5 V LO OV to 0 8 V E5 Check Z Axis Blanking E6 Check Z Axis Blanking ADJU
157. t greater than 2096 at constant intensity within the quality area Does not normally require customer verification Light Output Greater than 20 JW cm with a 700 line 60 Hz refresh raster with a 10096 duty cycle at maximum allowable drive to the crt over a 7 x 9 cm area 5 3 Calibration 606B TABLE 5 2 CONT Performance Check Summary Characteristic Performance Requirement 1 Performance Check Procedure Title Part 11 Adjustment and Performance Check Procedure Title HORIZONTAL X AMPLIFIER Deflection Factor Internally adjustable from 0 5 V to 2 5 V for 8 divisions of deflection Externally adjustable for at least 1096 of nominal C2 Check Positioning and Gain C3 Adjust X Amplifier Gain and Check Positioning input Attenuators Allows a 5X increase in deflection factor C5 Check Horizonta Input Attenuation C7 Check Horizontal Input Attenuation Polarity Signal deflects beam to the right Signal deflects beam to the left Does not normally require customer verification Bandwidth Dc to at least 3 MHz at 3 dB point C4 Check Horizontal Bandwidth C6 Check Horizontal Bandwidth Settling Time After deflection between any 2 points on screen Spot must reach new writing position within 0 008 cm 0 003 inch within 5OO ns After deflection to any point on Screen from within
158. the amplitude measurement standard The accuracy of the measurement of input attenuation is determined by the test Oscilloscope vertical sensitivity calibration a Verify that the Horizontal X Amplifier sensitivity is set for 1V 8cm deflection b Turn off the instrument POWER Set the and atten Switches 5100 S105 in the 5X position back Turn on the 6068 POWER c Connect the Calibration Generator Std Ampl Output to the Vertical Input of the test oscilloscope through a 50 ohm terminator Calibration Part 11 606B Adjustment and Performance Check d Set the test Oscilloscope deflection factor Volts Div to 1 V Div Accurately set the test oscilloscope vertical gain for 5 divisions of deflection Change the Calibration Generator mode to High Ampl and set the Period control to 1 ms 1 kHz Set the Calibration Generator Pulse Amplitude for exactly five divisions of vertical deflection on the test oscilloscope position as necessary f Disconnect the Calibration Generator from the test Oscilloscope vertical input and connect it Calibration Generator High Ampl Output through the dual input coupler to the X INPUT connector on the 606B and the external trigger input on the Ramp Generator g Apply a positive going 10 msec ramp of 1 volt amplitude to the Y INPUT connector h CHECK For 8 divisions of horizontal deflection i ADJUST C103 X Atten Comp for optimum square corner h Disconnect th
159. to travel from the zero percent level to the 100 percent level see Fig 5 2 is 500 ns 0 4 div or less within a trace width 0 008 cm SETTLING TIME 100 gt a L i EI j L4 i ld f T i r 1 1 E i i i Ke 2025 49 Figure 5 2 Typical crt display for vertical settling time measurement 5 20 D4 CHECK VERTICAL BANDWIDTH NOTE If the preceding step was not performed first perform step D1 then proceed D4 SETUP CONDITIONS 6068 Controls Make no changes to the contro settings 606B Rear Sine Wave Generator Ramp Generator Output Ramp Out U bnc Cables Test Equipment Controls Ramp Generator Ramp Signal bibe 10 msec Triggering os es erraren vi vr D opener Re rera AUTO Amplitude Set for 10 divs deflection Sine Wave Generator Frequency Amplitude 50 kHz 08V p p 12821 40 2821 81 a Set the Sine Wave Generator amplitude for 6 divisions of deflection b Slowly increase the Sine Wave Generator output frequency until the display amplitude is 4 2 divisions c CHECK That the Sine Wave Generator is at least 3 MHz D5 CHECK VERTICAL INPUT ATTENUATION NOTE If the preceding step was not performed first perform step Df then proceed D5 SETUP CONDITIONS 6068 Controls 606B Rear Panel
160. tors and indicators internal The 606B Monitor is a compact solid state instrument Switches and selectors checkout procedure and other with excellent resolution providing accurate displays of information relative to operating and checking information from the X Y and Z signal inputs instrument operation Section 3 Theory of Operation contains basic and general circuit analysis that may be useful fora servicing or operating the instrument High voltage is present inside the instrument To avoid electric shock hazards operating personnel must not remove protective Section 4 Maintenance describes routine an corrective maintenance procedures with fletaile instrument covers Component replacement instructions for replacing assemblies subassemblies and internal adjustments must be made by and individual components qualified service personnel only General information 606B The Horizontal X and Vertical Y Amplifiers process the input signals either single ended or differential and provide push pull outputs to drive the crt deflection plates The input signals are applied through the appropriate noninverting and inverting INPUT connectors The Z Axis Amplifier controls the display intensity by providing a voltage to drive the crt control grid The input signals either single ended or differential applied through the appropriate noninverting and inverting INPUT conne
161. transistors Q250 Q260 and the metal work circuit board and chassis is minimized by driving a metal shield to which 0250 0260 are mounted with the current output of emitter followers 0270 0280 The Y GAIN control R204 provides a fine gain adjustment of at least 10 of the 8 cm deflection This control in conjunction with R229 Y Gain internal screwdriver adjust on the Pre Amplifier board is normally set to a nominal 1 voit for 8 divisions of deflection step attenuator in the 1X position Resistor R209 Output Amplifier Gain is provided to match the Y Output Amplifier gain to the crt sensitivity and not to alter the deflection factor The compensation networks connected to the emitter of Q200 optimize the square wave response to provide the very good settling time performance D Z AXIS AMPLIFIER The Z Axis Amplifier processes the Z input signals either single ended or differential and provides the drive signal to control the crt intensity A schematic diagram of the Z Axis Amplifier is shown on diagram 3 A detailed block diagram identifying each major stage of the Z Axis Amplifier is superimposed on the schematic with wide shaded lines to conveniently locate the components mentioned here The stage names given as sub headings in the following discussion can be found in the shaded boxes on diagram 3 Z INPUTS Three input signal connectors are provided to the Z Inputs circuit 1 the 7 INPUT noninverting bnc
162. trols DVM Digital Voltmeter Range Function 2821 51 a Connect the DVM between the 250 V test point TP350 and ground TP353 b EXAMINE For a voltage reading within the range given in Table 5 4 c Remove the high voltage shield d ADJUST R112 250 V Adj located on the Converter board for a voltmeter reading of exactly 250 V Calibration Part l 6068 Adjustment and Performance Check ADJUST FREQ R124 NOTE if the preceding step was not performed first perform step A1 then proceed A5 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Monitor Variable AC Power Supply O Output Test Equipment Controls DVM Digital Voltmeter Range Function EAO eee eee A 1 kV dc Variable Ac Power Supply Output Voltage a Disconnect the 6068 from the power source and Connect the 90 volts from the Variable AC Power Supply to the 606B power input b Connect the DVM between the 250 V Test point TP350 and ground TP353 ADJUST R124 FREQ for maximum voltage at TP350 d Set the line voltage to 107 V ac Variable AC Power Supply Position dot off screen and set INTENSITY full on f ADJUST R124 FREQ CCW until the 250 V Supply first moves then approximately 10 CW 9 Reduce the INTENSITY control to midrange h Reset the line voltage to 120 V ac 5 31 Calibration Part i 606B Adjustme
163. tween TP280 Z Axis out and ground TP353 d EXAMINE For a DVM reading of approximately 3 volt Set the INTENSITY control for a DVM reading of O volt NOTE if in part e the dot disappears rotate the Grid Bias R245 till the dot becomes visible then proceed with part f f ADJUST R245 Grid Bias until the dot just disappears g Disconnect the DVM from the Monitor h Set the INTENSITY control for a visible display 5 33 Calibration Part 606 Adjustment and Performance Check B3 ADJUST TRACE ALIGN R290 FRONT PANEL AND CHECK ORTHOGONALITY NOTE If the preceding step was not performed first perform step B1 then proceed 83 SETUP CONDITIONS 6068 Controls Make no changes to the control settings 606B Rear Panel Ramp Generator Ramp Out bnc Cable Test Equipment Controls Ramp Generator Ramp Signal Triggering Amplitude eo 5ms A tAUTO e provide 10 div deflection 2821 56 a Position the trace to the center horizontal graticule line b EXAMINE The trace for alignment with the horizontal graticule line c ADJUST R290 front panel TRACE ALIGN to align the trace with the center horizontal graticule line d Disconnect the Ramp Generator from the X INPUT and connect it to the Y INPUT Reduce the Ramp Generator Amplitude to provide 8 divisions of vertical deflection e Position the trace to the center vertical graticule line f C
164. ulated dust with dry low velocity air approximately 5 Ib in Remove any dirt which remains with a soft brush or a cloth dampened with a mild detergent and water solution cotton tipped applicator is useful for cleaning in narrow spaces or for cleaning more delicate circuit components CAUTION Circuit boards and components must be dry before applying power to the instrument to prevent damage from electrical arcing The high voltage circuits should receive special attention Excessive dirt in this area may cause high voltage arcing and result in improper instrument operation SEMICONDUCTOR CHECKS Periodic checks of semiconductors are not recommended The best check of semiconductor performance is actual operation in the instrument More details on semiconductors are given under Troubleshooting later in this section PERIODIC ELECTRICAL ADJUSTMENT To ensure accurate measurements check the electrial adjustment of this instrument after each 1000 hours of operation or every six months if used infrequently In addition replacement of components may necessitate adjustment of the affected circuits Complete adjustment instructions are given in Section 5 Calibration This procedure can be helpful in localizing certain troubles in the instrument and in some cases may correct them 4 1 Maintenance 606B TROUBLESHOOTING The following information is provided to facilitate troubleshooting of the Monitor Information contai
165. unted instrument 1 6 General information 6068 SPECIFICATION The electrical specifications listed in Table 1 3 apply when the following conditions are met 1 The instrument must have been adjusted at an ambient temperature between 15 and 25 C 2 The instrument must be operating in an ambient temperature between O and 50 C and 3 The instrument must have been operating for at least 20 minutes TABLE 1 3 Electrical Characteristics Characteristic Performance Requirement ONTAL AMPLIFIERS Deflection Factor Vertical adjustable from 0 5 volt to 2 5 volts for 8 divisions Externally adjustable for at least 1096 of Horizontal Internally adjustable from 0 5 volt to 2 5 volts for 8 divisions of deflection Externally adjustable for at least 10 of Lo nominal Attenuators 7 1X 5X step attenuators extend the deflection factor range to at least 12 5 volts full screen Polarity X INPUT Positive signal applied deflects beam to the right negative signal applied deflects beam to the left X INPUT Positive signal applied deflects beam to the left negative signal applied deflects beam to the right Y INPUT Positive signal applied deflects beam up negative signal applied d fl cts beam down j oa Y INPUT n nal applied deflects beam down negative signal flects beam up Bandwidth 8096 full screen refere
166. ures a multiplier and a tolerance value see Fig 4 1 Metal film resistors have five stripes consisting of three significant figures a multiplier and a tolerance value The values of common disc capacitors and small electrolytics are marked on the side of the component body The white ceramic and epoxy coated tantalum capacitors used in the instrument are color coded using modified EIA code see Fig 4 1 The cathode end of glass encased diodes is indicated by a stripe a series of stripes or a dot The cathode and anode ends of metal encased diodes can be identified by the diode symbol marked on the body SEMICONDUCTOR LEAD CONFIGURATIONS Figure 4 2 shows the lead configurations of the semiconductors in the 606B Monitor MULTI PIN CONNECTOR HOLDERS The multi pin connector holders are keyed with two triangles one on the holder and one on the circuit board When a connection is made perpendicular to a circuit board surface the orientation of the triangle on the end lead multi pin connector holder is determined by the placement of the multi pin connector index see Fig 4 3 Maintenance 606B COLOR CODE D ano 3 ist 2nd AND 3rd SIGNIFICANT FIGS AND OR 0 CODE MAY NOT BE PRESENT ON SOME CAPACITORS MULTIPLIER TOLERANCE TEMPERATURE COEFFICIENT POSITIVE POLARITY AND VOLTAGE RATING METAL FILM RESISTORS CERAMIC CAPACITORS SMALL DISC CALL
167. us circuit diagram 4 and approximately ground The Modulator output is coupled through C111 to the Demodulator Demodulator The Demodulator rectifies the signal from the Modulator and references it to the potential on C121 The potential on C121 is determined by voltage divider R127A R127B and Coarse Focus control R125 The negative swing of the supply is limited by CR116 to the level of C121 the positive excursion is coupled through CR114 and R112 to C112 Quiescently C112 will charge to about 3250 volts through R112 After repetitive cycles from C111 C112 will charge to the cathode supply level Capacitor C112 filters the output of the demodulator and also provides a path for the high frequency portions of the focus correction signal to be coupled to the crt focus element at V50 The remainder of the components provide circuit protection in the event of a high voltage arc or other malfunction Geometry adjustment R185 varies the positive level on the geometry element to control the overall geometry of the display TRACE ALIGN adjustment R290 controls the current through L50 to provide adjustment of the display alignment The Stig 1 and Stig 2 functions are described in the circuit description of the Dynamic Focus diagram 4 e LOW VOLTAGE POWER SUPPLY The Low Voltage Power Supply provides the operating power for the Monitor Electronic regulation is used to provide stable low ripple output voltages schematic d
168. ustment standardizes the output amplifier gain and must not be used for adjusting deflection sensitivity Altering this adjustment will change HF Compensation and misadjustment may cause output amplifier saturation resulting in poor off screen recovery and degradation of settling time performance 6068 Rear Calibration Generator Fast Rise Out e ADJUST X GAIN R104 front panel for a crt display of exactly 4 cm of deflection bnc Cables f Disconnect the Calibration Generator from the Monitor Test Equipment Controls Ramp Generator Ramp Signal 5 msec Ramp Yos Teun AUTO Ext 9 CHECK Rotate the horizontal Position control and Amplitude set for 8 div check that the vertical trace can be positioned deflection horizontally anywhere in the graticule area Calibration Generator QUID ere pere Deren fast rise Amplitude 0 25 volt 1 NOTE Period Mia ripe ei EPI Leta 1 ms 1 kHz The Horizontal system is now adjusted to maximum sensitivity 0 5V 8cm This internal X Gain R129 X Y Pre Amplifier board may be readjusted for any deflection 2821 314 NOTE factor within specified limits 0 5V 8cm to This procedure adjusts all gain set controls 22 5V 8cm by applying the desired input R104 R109 R129 for the Horizontal X amplitude adjusting for appropriate Amplifier Normally the Output Amplifier horizontal deflection Gain R109 will not be adjuste
169. will short the equivalent input from the ALTERNATE INPUTS connector Be sure the grounding cap is on the INPUT before making connection to the ALTERNATE INPUTS connector INPUT SIGNAL REQUIREMENTS The horizontal X and vertical Y deflection factors are set at the factory to one volt for eight divisions of deflection on each axis Thus as shipped the input signal required for each division of deflection is 0 125 volt The best transient response from the 606B Monitor is achieved when the input signal amplitude to the X and Y INPUT is no greater than that sufficient to provide full screen deflection To avoid electric shock hazard do not apply input signals at more than 25 volts dc plus peak With no signals applied to the Z INPUT the intensity of the display is controlled only by the front panel INTENSITY control To control the display intensity with an externally applied signal set the INTENSITY control to about midrange and apply the input signal to the Z INPUT connector Qn CAUTION an an Pans an Exercise care in establishing the correct display intensity a high amplitude Z Axis input signal combined with an excessively high setting of the INTENSITY control may damage the crt phosphor The very small spot size of this instrument increases the chances of crt phosphor damage Do not allow a stationary bright focused spot to remain on the screen 2 1 Operating Information 606B
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