Midway 16-20040-101, 16-20044-101 manual Check floppy drive for diskette. If you find disk

Video Troubleshooting Table, continued

	SYMPTOM	CAUSE		REQUIRED ACTION
				Check floppy drive for diskette. If you find disk,
• VGM (video game machine)		Floppy disk in drive		eject it. Leave VGM power on. Turn off
	doesn’t appear			computer. Wait for hard disk to stop spinning.
				Turn on computer.
•	No audio			Loosen computer case lid thumbscrews and lift
		Faulty wiring		off cover. Assure that hard drive ribbon cable
•	Power-up self-test runs			connector is fully seated into mating connector
				on motherboard. Check hard drive power cable.
			1. Verify that hard disk drive is correct for this
		Improper components		VGM. Label on drive records manufacturer
				name, assembly number and program version.
			2. Verify that		circuit boards	are correct	for this
				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 includes more than one ROM.
				Label on each ROM records assembly number
				and software version.
		Hard drive problems	1. Turn computer 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.
		Picture tube aperture		Remove diskettes from room. Demagnetize
• Blotches of color appear on		mask is magnetized		monitor with external degaussing coil. Take care
	screen			not to magnetize neighboring VGMs. Monitor
				may be on or off for this procedure.
			1.	Turn on VGM.
• White areas in center of		Picture tube purity or	2.	Press and hold TEST MODE to enter Menu
	screen appear tinged with	static convergence is		System. At Operator (Main) Menu, select
	color	out of alignment		Diagnostic Menu. Then select Monitor Patterns
				Menu. Run through Crosshatch, Red, Green and
• Object edges have fringe of				Blue screens to find clearest display of problem.
	one or more colors		3.	Display screen with greatest problem.
			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.

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 6-13