Midway 16-20044-101, 16-20040-101 manual 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.		Computer has no internal LEDs.
		2. Turn on VGM power. Using 20-volt DC setting on
		digital voltmeter, measure DC voltages at power
		connector pins. (Power supply voltage isn’t
		adjustable.)
		3. Using 2-volt AC setting on digital voltmeter,
		measure same DC voltages as above. Any
		reading here indicates that supply voltages are
		unstable and may contain ripple or noise.
		Turn off VGM power. Assure that wiring harness
	Faulty wiring	connectors fully seat onto mating board
		connectors. Verify that harness connects to
		computer. Check other connectors in same way.
	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
	or arcade computer	indicator status charts. Note discrepancies.
		2. Turn off computer. Wait for hard disk to stop
		spinning. Leave VGM power on. Loosen
		computer case thumbscrews and lift off cover.
		Turn computer power on. Listen for beeping
		sounds. Compare beeps with Error Message
		Troubleshooting Table.

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