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Troubleshooting 6-8
Video Troubleshooting Table
SYMPTOM
CAUSE
REQUIRED ACTION
Power problem
Verify connection of AC Power to video monitor.
Inspect CRT neck in dim light. Glowing filament
near CRT base proves that some monitor
circuits receive power. Still, voltages or signals
may not be normal.
Faulty wiring
1. Turn off VGM power. Verify that video signal and
Remote Adjustment Board connectors seat
properly on Video Monitor Board.
2. Assure that video cables connect to circuit
boards.
3. Assure that no wires are caught on chassis or
mounting brackets.
Improper monitor
adjustments
1. Check that BRIGHTNESS (intensity) and
CONTRAST are set above their minimum levels.
2. If necessary, adjust these settings.
•
Monitor appears non-
functional
•
Audio is present
•
VGM
(video game machine)
controls operate normally
Faulty monitor
circuitry
1. Examine AC line fuse on Video Monitor Board. If
fuse is faulty, replace it with identical fuse.
2. If fuse is good: Verify that video monitor
operates correctly by placing it in working VGM.
3. If monitor is bad: Check monitor power supply.
4. If power supply is good: Check monitor
horizontal output transistor and related circuitry.
WARNING: HIGH VOLTAGE. VGM monitors generate and store potentially lethal high
voltages. Avoid touching any part of the monitor until power has been off for some time.
A picture tube can maintain a hazardous charge for up to several days. Only qualified
technicians should service monitors. Turn off the power, unplug the VGM and
discharge the CRT before attempting service. Even properly discharged tubes can
revert to a highly charged state, without reapplication of power.
WARNING: In normal operation, the monitor doesn’t require isolation from AC line
voltage. During bench servicing, you may need to operate the monitor outside the
cabinet. If you do, isolate the monitor from line voltage with an isolation transformer.
CAUTION: Don’t operate the monitor without the Remote Adjustment Board.
Typical Cutaway Rear View
Summary of Contents for 4-Player 25" Dedicated Video Game
Page 2: ...Midway Amusement Games LLC 3401 North California Avenue Chicago Illinois 60618 5899 USA...
Page 20: ...Operation 2 12 NOTES...
Page 92: ...Wiring 5 4 POWER WIRING DIAGRAM...
Page 93: ...Wiring 5 5 CABINET WIRING DIAGRAM...
Page 94: ...Wiring 5 6 CONTROL PANEL WIRING DIAGRAM...
Page 99: ...Wiring 5 11 SOUND I O BOARD ASSEMBLY...
Page 118: ...Parts 7 4 CABINET REAR VIEW 4008 01003 16 01 10714 A 20281 4108 01219 11 03 8326...
Page 120: ...Parts 7 6 CASTERS 01 9359 02 4404 20 9627 20 8712 37 4108 01219 11 LEG LEVELERS...
Page 121: ...Parts 7 7 CABINET DECALS 31 3491 1 31 1768 31 3483 31 3484 31 3586 31 3587 31 3587 31 3492 1...
Page 123: ...Parts 7 9 PLAYER PANEL HOUSING INSTALLATION 4320 01124 32 4700 00075 00...
Page 127: ...Parts 7 13 49 WAY JOYSTICK ASSEMBLY A 21939 1 AND BUTTON ASSEMBLY 20 10209 X...
Page 133: ...Parts 7 19 BANSHEE VIDEO CARD 20 10516 No Field Replaceable Parts...
Page 138: ...Parts 7 24 NOTES...
Page 139: ......