Midway 4-Player 25" Dedicated Video Game manual Joystick Troubleshooting Table

Joystick Troubleshooting Table

	SYMPTOM	CAUSE		REQUIRED ACTION
				Enter game Menu System by pressing and
•	Players complain that	Faulty switch		holding TEST MODE switch inside coin door.
	joystick operates erratically			From Diagnostics Menu, choose SWITCH TEST.
	or unreliably			Operate joystick in question. Check for proper
				readings of up, down, left and right.
•	Game starts normally		1.	Check for wires caught in door hinges, latches or
		Faulty switch wiring		switch contacts.
			2.	Verify that harness connectors are attached and
				fully seated.
			3.	Assure that joystick switches connect properly to
				control input wires.
			4.	Reconnect loose cables.
			5.	Check joystick cable ground connections.
			6.	Check that cabinet wiring is correct for this VGM
				(video game machine).
			7.	Repair faulty wiring.
			1.	Inspect joystick for: Missing, loose or damaged
		Faulty mechanical		parts, torn rubber T-band, etc.
		parts	2.	Replace bad parts.
				Clean dust out of optos with swab and cleaner.
		Dirty optos		Don’t apply cleaner directly into opto. Never use
				solvents!
			1.	Check fuses on I-40 Joystick Interface Board
		Faulty joystick fuse		inside player control panel. Each joystick has its
				own fuse.
			2.	Replace bad fuses.
			1.	If joystick fuses are okay, install joystick in
		Faulty joystick		working VGM (video game machine) and retest
		electronics		it.
			2.	If joystick still doesn’t work, replace it.
			1.	If joystick works in second VGM, I-40 Joystick
		Faulty I-40 Joystick		Interface Board may be bad.
		Interface Board	2.	Replace board and retest joystick.

Joystick Parts

Troubleshooting 6-7