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Zenith Data Systems ZVM-124 Service Manual
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CONTENTSCleaning Procedures ................................................. 7.2Description and Specifications ....................... 1.1 Adjustmen ts ................................................................... 7.2List of Tools, Test Equipment, Focus Adjustment ................................................... 7.2and Supplies ................................................. 1.1 B+ Voltage Adjustment ........................................ 7.2Tools ............................................................................ 1.1 CRT Yoke Adjustment ........................................ 7.3Test Equipment ...................................................... 1.1 Trou bleshooting ........................................................... 7.3Supplies ...................................................................... 1.1 Main Circuit Board Troubleshooting ........... 7.4Specifications ............................................................. 1.2 Main Circuit Board Waveforms ...................... 7.4CRT Socket Board Troubleshooting .............. 7.5Installation ...................................................... 2.1 Power Supply Troubleshooting ........................ 7.6V ideo Moni tor ............................................................ 2.1Vol tage Selection ...................................................... 2.2 Reassembly ........................................................ 8.1Connections ................................................................. 2.4 Control Panel Assembly Installation ................ 8.1Signal Cable Interface ............................................ 2.4 Power Switch Assembly Installation ................ 8.1Main Circuit Board Installation ......................... 8.1Operation ........................................................... 3.1 Fuse Board Installation ........................................... 8.2Initial Setup of the Operating Power Transformer Assembly Installation .... 8.3Controls and Monitor ............................... 3.1 Ca thode- Ra y Tube Installation .......................... 8.3CRT Socket Board Installation ........................... 8.4Theory of Operation ....................................... 4.1 Back Cover Installation .......................................... 8.4Theory of Operation .............................................. 4.1Video and Highlight Inputs ............................. .4.1 Parts Lists .......................................................... 9.1Vertical Sync Input ............................................... 4.1Horizontal Sync Input... ....................................... 4.2 Figures1.1 The ZVM-124 Video Monitor. ............... l.lCircuit Description ........................................... 5.1 2.1 Video Monitor Front View ..................... 2.1Power Supply ............................................................... 5.1 2.2 Video Monitor Rear View ...................... 2.1Video and Highlight 2.3 l20-Volt Wiring .......................................... 2.2Driver Circuitry .......................................... 5.1 2.4 Main Board Transformer Leads ........... 2.2Horizontal Circuitry .................................................5.2 2.5 Power Transformer Replacement ....... 2.3Vertical Sweep Circuit ........................................... 5.3 2.6 Power Switch Replacement... ................. 2.3Schematic ....................................................................... 5.4 2.7 220- Volt Wiring ............................................ 2.32.8 Monitor Cable Connections .................... 2.4Disassem bly ........................................................ 6.1 3.1 Front Panel Controls ................................. 3.2Back Cover Removal ............................................... 6.1 3.2 Video Monitor Rear View ...................... 3.2Power Transformer Assembly Removal ......... 6.1 4.1 ZVM-124 Block Diagram ........................ .4.2Fuse Board Removal ................................................ 6.2 5.1 Schematic ........................................................ 5.3CRT Socket Board RemovaL .............................. 6.2 6.1 Back Cover Removal... .............................. 6.1Main Circuit Board Removal .............................. 6.3 6.2 Transfer RemovaL .................................... 6.1Power Switch Assembly RemovaL ................... 6.4 6.3 Transformer Disassembly ....................... 6.2Control Panel Assembly Removal ..................... 6.4 6.4 Fuse Board ..................................................... 6.2Cathode-Ray Tube Removal ................................ 6.4 6.5 Main Board .................................................... 6.26.6 Fuse Board Removal ................................. 6.3Servicing Instruction ........................................ 7.1 6.7 CR T Socket Board Removal .................. 6.3Safety and Service Guidelines ............................ 7.1 6.8 Main Board Removal,AC Leakage Test ..................................................... 7.1 Discharging the CRT ....................... 6.3Other Precautions ................................................... 7.1 6.9 Power Switch Removal ............................ 6.4Page iii |
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