Midway 4-Player 25" Dedicated Video Game - Manual (Page 109)

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