Midway 4-Player 25" Dedicated Video Game manual Turn on VGM video game machine

Video Troubleshooting Table, continued

	SYMPTOM	CAUSE		REQUIRED ACTION
			1.	Verify that hard disk drive is correct for this VGM
• Game screens don’t appear		Improper components		(video game machine). Label on drive records
				manufacturer name, assembly number and
•	No audio			program version.
			2.	Verify that circuit boards are correct for this
•	Power-up self-test runs			VGM. Label on each board records
				manufacturer name, assembly number and
				hardware version.
			3.	Verify that ROM instruction set is correct for this
				VGM. VGM set only has one ROM. Label on
				ROM records assembly number and software
				version.
			4.	Replace improper ROMs with correct ones.
		Hard drive problems	1.	Turn VGM on. Immediately look under hard
				drive. Hard Drive Activity LED flashes if drive is
				operating properly.
			2.	Allow VGM to load normally. Note and record
				any error messages that occur during self-test.
			3.	Remove hard drive and install it in working VGM.
				If symptom recurs there, hard drive is faulty.
				Replace it.
				Remove diskettes from room. Demagnetize
• Blotches of color appear on		Picture tube aperture		monitor with external degaussing coil. Take care
	screen	mask is magnetized		not to magnetize neighboring VGMs. Monitor
				may be on or off for this procedure.
• White areas in center of		Picture tube purity or	1.	Turn on VGM (video game machine).
			2.	Press and hold TEST MODE to enter Menu
	screen appear tinged with	static convergence is		System. At Main Menu, select Monitor Tests
	color	out of alignment		Menu. Run through Crosshatch, Red, Green and
				Blue screens to find clearest display of problem.
• Object edges have fringe of			3.	Display screen with greatest problem.
	one or more colors		4.	Display Crosshatch Screen. Locate purity and
				static convergence ring magnets on back of
				monitor neck. Watch screen in mirror. Adjust
				magnets to minimize problem. Follow
				instructions from monitor manufacturer.
			5.	Display Crosshatch Screen. Touch up
				adjustments while watching screen in mirror.
			1.	Press and hold TEST MODE to enter Menu
• Background of Attract Mode		Medium resolution		System. At Main Menu, select Diagnostics. Then
	screens seems out of sync	monitor, and DIP		select DIP Switch Tests Menu.
		switch set for low	2.	Locate DIP switch bank U12 on the Sound I/O
• Words on screen read OK		resolution		Board.
			3.	Turn off switch 2.
			4.	Reenter Attract Mode and check screens.

CAUTION: Don’t operate the monitor without its Remote Adjustment Board.

WARNING: HANDLE FLUORESCENT TUBE AND CRT WITH CARE. If you drop a fluorescent tube or CRT and it breaks, it will implode! Shattered glass can fly eight feet or more from the implosion.

Troubleshooting 6-9