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Audio Troubleshooting Table
SYMPTOM
.
No audio
.
Video is present
.
VGM appears to operate
normally
.
Constant low hum from all
speakers.
.
Audio is distorted, muffled or
has missing frequencies.
.
Dead sound channel
CAUSE
Improper volume
setting
Faulty
wiring
Faulty
or
obstructed
speaker
Faulty Audio Board
1.
Faulty wiring
2. Verify that cabinet wiring provides separate
3.
1. Run power-up self-test sequence. Note errors
Faulty Sound I/O
Board
2.
Faulty power supply
1.
Faulty or improper
speaker
2. Verify proper speaker operation by connecting
Faulty
wiring
1. From Self-Test Menu, choose SOUND TEST.
Faulty speaker
2. Verify proper speaker operation by connecting
Faulty circuit board
Faulty wiring
7-6
REQUIRED ACTION
Enter Menu System by pressing and
TEST MODE switch. From Self-Test (Main)
Menu, choose ADJUST VOLUME. Check that
Attract Music is on (enabled). Verify that all
volume levels are set well above zero. If
necessary, change levels to make VGM audible.
Turn off VGM power. Assure that wiring harness
connectors attach and fully seat onto mating
board connectors. Verify that harness connects
to circuit boards. Check audio cable connectors
in same way.
Remove grilles and inspect speakers. Free
speaker cones, terminals, mounting screws and
magnets of loose parts or wires.
Verify proper operation of Audio Board by
placing it in working VGM.
Check that cabinet wiring is correct for this VGM.
wires (not common return) for each speaker.
Check connection of all cabinet ground wires.
that VGM finds during tests. Compare Sound I/O
Board LEDs with LED indicator status charts.
Note discrepancies.
Verify that Sound I/O Board operates by placing
it in working VGM. Replace bad parts.
Using 2 Volt AC setting on digital voltmeter,
measure voltages at speaker terminals. Any
reading indicates unstable supply that may
contain ripple or noise.
Turn off VGM power. Remove grilles and check
speakers. Assure that speakers are full range
(100 to 10,000 Hz response) and rated for at
least 20 watts. Woofers must be rated for at
least 40 watts.
speaker in question to working VGM.
Multiple-speaker
installations:
reversed wires at one speaker. Weak low
frequencies and thin or hollow sound quality is
symptom of incorrectly phased speakers. Sound
tests may not detect this condition, but you can
hear it during VGM operation.
Recheck speakers with audio signals provided
by test.
speaker in question to working VGM.
Run power-up self-test sequence. Note errors
that VGM finds during tests. Compare
board LEDs with LED indicator status charts.
Note discrepancies.
Verify that cabinet wiring is correct. Assure that
all speakers connect to audio wires. Check for
broken or shorted wires.
holding
for
Check
6
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