Video Troubleshooting Table
SYMPTOM
CAUSE
REQUIRED ACTION
Monitor appears non-
functional
Audio is present
VGM controls operate
normally
l
Power problem
Faulty wiring
Improper monitor
adjustments
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.
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
no wires
mounting brackets.
Check that BRIGHTNESS (intensity) and
CONTRAST are set above their minimum
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
4 . I f
i s g o o d : C h e c k
operates correctly by placing it in working VGM
3.
If
IS
bad: Check
power
horizontal out ut transistor and related circuit
.
Faulty monitor
circuitry
WARNING:
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
an isolation
CRT
*NECK BOARD
I
*MAIN BOARD
ASSEMBLY
REMOTE
BOARD ASSEMBLY
Typical Monitor Components
7-l 0
1 0
Summary of Contents for San Francisco Rush 2049
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