Troubleshooting - 10
Midway Amusement Games, LLC
Audio Malfunctions
Symptom Problem
Suggested
Solution
•
Audio is non-
functional.
•
Video is functional
•
VGM appears to
operate normally.
Volume set to zero
in software.
1. Unlock and remove the cash door.
2. Open the rear cover.
3. Enter the VGM Menu System by pressing the
SETUP button.
4. From the SYSTEM SETUP menu, go to
DIAGNOSTICS and choose SOUND TEST.
5. Verify that volume has not been set at zero.
6. Change the level to maximum to make the VGM
audible.
Volume set to zero
on CPU Board
Assembly
1. Select an endlessly repeating sound track.
2. With the screen audio level at maximum, turn the
master volume control on the CPU Board
Assemblyfull up. Do not come into contact with the
high voltage leads.
3. Now reduce the master volume until the sound is
as loud as possible without distortion.
4. Use the screen adjustments to set a comfortable
playing level.
While in the SOUND TEST menu, select PLAY and use
the NEXT box to advance through all the game sounds.
Use sounds to confirm operation of the audio amplifier
and speaker. Note if any game sounds are
unintelligible, voice messages, strange noises, missing.
Poor connection
1. Turn OFF VGM power.
2. Verify correct cabinet wiring for this VGM.
3. Ensure that the speaker is properly connected to
the audio output wires from the Audio connector.
4. Verify speaker continuity.
5. Refer to Typical Cabinet Wiring Diagram for
specific wiring information.
Poor power
continuity
1. Turn ON VGM power.
2. Using the 20 Volt DC range on a digital voltmeter,
measure DC voltages present at the Power
connector pins.
3. Verify the +5V, -5V and +12V sources.
4. Refer to the Typical Cabinet Wiring Diagram for
specific wiring information and voltage limits.
5. Using the 2 Volt AC range on a digital voltmeter,
measure the same DC voltages as above.
6. Any reading here indicates that the supply voltages
are unstable and may contain ripple or noise.
7. Verify proper operation of CPU Board Assembly by
placing it in a known functional unit.
