Midway 4-Player 25" Dedicated Video Game Front View Of Coin Door Interior View Of Electronics

VGM Startup Troubleshooting Table, continued

SYMPTOM	CAUSE		REQUIRED ACTION
		1. Inspect circuit boards under low-light conditions.
• VGM (video game machine)	Power problem		LEDs glow if processor circuits receive voltage.
appears non-functional.			Fan should be turning. These indications prove
			presence of DC from power supply. Still,
• Currency acceptor price			voltages or signals may not be normal.
indicator is illuminated.		2.	Turn on VGM power. Using 20-volt DC setting on
			digital voltmeter, measure DC voltages at power
			connector pins.
		3. Using 2-volt AC setting on digital voltmeter,
			measure same DC voltages as above. Any
			reading indicates ripple or noise. In that case,
			service power supply.
			Turn off VGM power. Assure that wiring harness
	Faulty wiring		connectors attach and fully seat onto mating
			board connectors.
	Improper jumper or		Verify that circuit board jumpers are set as
	DIP switch settings		intended. Check DIP switch settings.
		1. Run power-up self-test sequence. Note errors or
	Faulty circuit boards		failures during tests. Compare LEDs with LED
			indicator status charts. Note discrepancies.
		2.	Replace faulty PC boards and rerun self-test.

CAUTION: Don’t remove or install any connector while power is turned on. Doing so will damage circuit boards or hard disk drive, and void warranty.

Front View Of Coin Door Interior View Of Electronics

Troubleshooting 6-4