Zenith Data Systems SM-ZVM-134, Service Manual

Page 1: ...Copyright 1983 Zenith Data Systems All Rights Reserved SM ZVM 134 Color Monitor Service Manual SAINT JOSEPH MICHIGAN 49085 585 23 First Printing Printed in the United States of America...

Page 2: ...he metal plate located on the right side of the monitor that holds the sweep assembly together Cold Ground is a DC cold ground It is taken from the main chassis across the top of the monitor Discharge...

Page 3: ...Main Board 4 2 Sweep Assembly 4 2 Video Output Board 4 2 RGB Input Signal 4 2 DISASSEMBLY 5 1 Back Cover 5 1 Video Output Board 5 2 Main Board 5 3 Sweep Module and High Voltage Section 5 4 CRT 5 6 On...

Page 4: ...IV...

Page 5: ...B computing device pursuant to subpart Jof part 15 of the FCC rules Service of the ZVM 134 is to board level When you determine that a circuit board is at fault it must be replaced Return the defectiv...

Page 6: ...Page 1 2...

Page 7: ...e Analog 1 5 V Horiz sync TTL positive or negative Analog 1 5 V Vert sync TTL Positive or negative Analog 1 5 V Ground 13 90 degree 43 mm fine pitch dot mask 26 kV at 0 beam 450jJ A max beam current 1...

Page 8: ...Page 2 2...

Page 9: ...134 1 ZVM 134 Z ZVM 134 3 COMPUTER Z 100 family of computers IBM Apple CAPt I z VII 1 PIN SIGNAL I Plr T J 1JI8IJ 1 H 8 2 H 3 not used 4 V I 2 4OJ 5 G To 6 B 5 z0 J7 GItJ 7 R 3 Z I J 8 not used 9 V 9...

Page 10: ...134 1 ZVM 134 2 ZVM 134 3 COMPUTER Z 100 family of computers IBM Apple PIN SIGNAL 1 H 2 H 3 not used 4 V f M o 5 G 6 B R not used 9 V 10 not used Z6tfIrH CA e 1 7 11 13 21 Fo V cp IJ f IBn PC 9iJiff0...

Page 11: ...34 Monitor GREENIWIDTE SWITCH Position the rear panel GreenIWhite switch to White if you want a color display or to GREEN if you want a monochrome green display Refer to Figure 3 2 ON OFF SWITCH With...

Page 12: ...e Monitor is off When the Monitor is turned on and current begins to flow through the thermistor the thermistor heats up and Page 4 1 its resistance increases to several megohms This in creased resist...

Page 13: ...ot ground is refer enced to the low side of the line The potential on AC ground may be rather large relative to earth ground DC ground is isolated through the horizontal driver transformer Sweep Assem...

Page 14: ...cabinet To remove the back cover Remove the power cord from the power source Figure 5 1 Back cover removal Page 5 1 Disconnect the RGB cable Remove the two short hex screws near the top A Remove the...

Page 15: ...the board from the CRT neck VIDEO OUTPUT BOARD Remove cable 5A2 from the video output board Remove cable 5C2 from the video output board Disconnect the focus voltage lead by twisting the two plastic l...

Page 16: ...ve cables at 3W3 and 3V3 Pull out on the two tabs X X in front and lift the board until it passes the notch on the tabs Page 5 3 Pull out on the two tabs on the sides and lift the board until it passe...

Page 17: ...lead is to use a screwdriver and a Remove hex nut screw D a long shank 12 jumper wire with an alligator clip on or short shank 1 4 nut driver is each end Connect one alligator clip to necesssary the...

Page 18: ...your screwdriver Slide the end of the screw driver under the high voltage cap at the anode of the CRT You may or may not see a discharge spark depending on how much charge is built up Figure 5 5 CRT r...

Page 19: ...ounted to the inside front chassis To remove the On Off switch Remove the back cover Pull the switch knob off from the front of the cabinet Remove the hex nut screws X from the switch mounting bracket...

Page 20: ...onitor Check all connectors for good connec tions Check the GreenIWhite switch position Refer to Page 3 2 Check the RGB connector for a good con nection Refer to Page 3 2 Check the CRT filament for fi...

Page 21: ...oblem is located by the way the circuits relate to each other When you have determined the area to check refer to the pages that follow this chart for checkout pro cedures voltage measurements and sig...

Page 22: ...he metal plate located on the right side of the moni tor that holds the sweep assembly together Cold Ground is a DC cold ground It is taken from the main chassis across the top of the monitor A HOR IZ...

Page 23: ...volts 5 WIDTH CONTROL LX3261 0 The Width control LX3261 is located in the hori zontal sweep section Refer to Figure 6 2 This con trol is the fine adjustment Width control To adjust the Width control...

Page 24: ...bottom VERTICAL HEIGHT ADJUSTMENT R3418 J Page 6 5 The Vertical Height adjustment is located on the main board Refer to Figure 6 1 This control is used to adjust the vertical size of the display To a...

Page 25: ...down until the raster just disappears This adjust ment works best in a darkened room FOCUS CONTROL N The Focus control is located in the horizontal sweep section Refer to Figure 6 2 This control sets...

Page 26: ...und It is taken from the main chassis across the top of the monitor 1 o 1 C I 2A5 285 3F3 r J J J 1__1__1 MAIN BOARD MEASUREMENTS The main board develops 150 VDC B voltage for the horizontal output tr...

Page 27: ...board 3D3 Measure pins 1 3 5 and 6 of connector 3D3 Reference to DC cold chassis ground 170V P P 25 3V SU GND ABL 60V P P 140V P P FROM SWEEP ASSEMBLY If the voltages listed are not present re place...

Page 28: ...NC TO SWEEP ASSEMBLY 5C2 3 BASE 4 Gl 5 140VDC FROM MA IN BOARD 5A2 Page 6 9 If the voltages listed are not present re place the main board With your oscilloscope measure for RGB signals on pins 1 2 an...

Page 29: ...scope or meter to DC cold chassis ground Measure pins 1 and 2 of connector 2A3 VERTICAL HI 2A3 TO YOKE 2 __ VERTICAL LOW 3R3 2 3 353 2 Hthe vertical hi and low signals are not present at pins 1 and 2...

Page 30: ...y 2 14 11266 36 Cabinet front 3 46 10186 Control knob 4 12 7209 03 Cross brace 5 85 01614 3 RGB connector switch assembly 6 12 7208 01 Handle mounting bracket 7 12 7850 PC board rails 8 19 733 04 Wire...

Page 31: ...oard Cable5A2 Cable5C2 CRT ground strap HARDWARE ZDS PART NO Washer 93 2106 Screws 114 804 114 805 114 1274 114 1393 01 114 1393 03 114 1393 04 114 1393 05 114 1393 09 114 1393 10 114 1395 01 114 1425...

Page 32: ...The circuit component numbers relate to the compo nents on the horizontal width sweep assembly CIRCUIT ZOS DESCRIPTION COMPo NO PART NO RESISTORS R1 R2 63 10271 390 n 10 5 W CAPACITORS C1 C4 22 6466...

Page 33: ...2540 63 10235 48 R2502 63 10235 90 56000 R2541 63 10235 54 R2503 63 10235 58 2200 R2542 63 10235 53 R2504 63 10235 69 7500 R2543 63 10235 54 R2505 63 10857 27 800 0 potentiometer R2544 63 10235 54 red...

Page 34: ...63 10235 75 13000 R3401 63 10236 46 1 2MO R3461 63 10236 15kO R3402 63 10236 22 120kO R3462 63 10236 13 51kO R3403 63 10235 86 39000 R3463 63 10235 72 10000 R3404 63 10235 86 39000 R3465 63 10235 72 1...

Page 35: ...0 V C3208 22 7742 10 001 jl F 10 0 50 V DIODES C3209 22 7395 470 pF 5 500 V C3234 22 7395 470 pF 5 500 V CR2104 103 142 01 C3236 22 7861 14 2200jl F 35V CR21 05 103 254 01 C3246 22 7603 01A 10jl F 100...

Page 36: ...021 100fJ H Q2506 121 895 LX3202 95 3501 01 6OfJ H Q2507 121 1019 L3401 20 3887 01 1 2fJ H Q2509 121 1019 L3402 20 2998 39fJ H Q3200 F 12737 03201 121 499 01 TRANSFORMERS Q3202 121 1034 Q3203 121 1059...

Page 37: ...Page 7 8...

Page 38: ...ircuit component number C10l R104 etc on the proper X ray View B Refer to the Replacement Parts List for that circuit board Then locate this same number in the Circuit Component Number column C Adjace...

Page 39: ...Page 8 2 VIDEO OUTPUT BOARD 9 155 12 Shown from the component side A l1B30 o SWEEP BOARD A 10530 Shown from the component side HIGH VOLTAGE SWEEP BOARD 9 247 Shown from the component side...

Page 40: ...0 0 0 L _ ____ J L250l 1 2 H ED CUTOFF 1 12 512 2 2 MEG R2513 5 6K 00 R2515 9 0 1 12514 270 R2517 800 RZ543 80 GRN OAIV VDC FlL 1 12518 R2519 1 11 2 71 G 12 voc FIL b CR2505 FlL CR2504 R2521 DO L L _...

Page 41: ...ONL y DC r VOLTAGE SOURCE r TO DC 1 VOLlAGES TO 3V3 1 DC GROUp iJ AC GROUND NOTES 1 ALL RESISTOR VALUES ARE IN OHMS k 1 000 M 1 000 000 ALL RESISTORS ARE 1 4 WATT 5 UNLESS OTHERWISE SPECIFIED 2 ALL CA...

Page 42: ...END I 1 CHASSIS GROUND 2 7 CIRCUIT BOARD GROUND 3 DIRECTION 4 D SIGNALFROMS 100BUS 5 J SIGNAL TOS 100BUS 6 MECHANICAL CONNECTION 7 7 MALE CONNECTION 8 FEMALE CONNECTION 9 NO CONNECTION 10 CONNECTION 1...

Page 43: ...SS OTHERWISE SPECIFIED 3 REFER TO THE CIRCUIT BOARD X RAY VIEWS FOR THE PHYSICAL LOCATION OF PARTS LEGEND I 1 CHASSIS GROUND 2 l CIRCUIT BOARD GROUND 3 DIRECTION 4 C SIGNAL FROM S 100 BUS 5 C1 SIGNALT...