Midway Video Game Machine (VGM) None Specifications Page 75

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AUDIO TROUBLESHOOTING
l Video is present
l Video Game Machine
(VGM) appears to
, operate normally
j l Audio is distorted,
muffled or has missing
frequencies.
I
1 l Dead sound channel
lj
0
i
Cause
Required Action
I
.~___
Improper volume
1.
Access Main Menu, then select VOLUME LEVEL.
setting
Make sure Attract Mode Music is enabled. I
2.
Verify a//volume levels are properly set well above i
zero. If necessary, change volume levels to make
game audible.
1
Faulty wiring
1.
Switch off power to game machine. Check wiring
harness connectrons attach and fully seat onto
mating board connectors.
l Verify harness connects to CPU Board.
l Check audio cable connectors in same way.
I
:
Faulty or
obstructed
speaker
-
1.
Remove speaker grilles and inspect speakers.
2.
Clear loose parts and wires from magnets, mount-
ing screws, terminals, and speaker cones.
i
Faulty Audio
1.
Verify proper operation of Audio Board by placing
Board
it in a working game machine.
I
Power Problems
1.
Use 20.volt DC setting on digital voltmeter to mea-
sure DC voltages present at Power connector
I
pins. Verify +5V, -5V and +12V sources. Refer
to
Cabinet Wiring Diagram for
specrfic
wiring infor-
mation and voltage limits.
Faulty or improper
1.
Switch off power to game machine.
speaker
l Remove speaker grilles and inspect speake-s
l Verify speakers are full range (700 lo 10.000 hz
response) and rated for at least 20 watts. Woof- /
ers must be rated for at least 40 watts.
2.
Verify
proper speaker operation by plac!ng
speaker in question in a working game machine.
,
___-
Faulty wiring
1.
Multiple-speaker installations: Check for reversed
speaker wiring. Weak or low frequencies and thin
1
I
or hollow sound quality are symptoms of incor-
rectly phased speakers.
*Sound tests may not detect this condition. but
you can hear it during operation.
1.
Access Diagnostic Menu, then select Speaker
Test. Perform one or several of the available tests
2.
Verify
proper speaker operation by connecting
speaker in question to working game machine.
Faulty wiring
1.
Verify cabinet wiring is correct. Check audio
wrrinT\
connectron to speakers.
2.
Check audio cable connection is fully seated.
3.
Check for broken or shorted
wares.
I
/
ARCTIC THUNDER
TROUBLESHOOTI~VG
-
13
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