Midway Off Road Thunder Operation Manual

Troubleshooting          6-9
Player Control Troubleshooting Table
SYMPTOM CAUSE REQUIRED ACTION
Faulty switches or
lamps1.  Enter Menu System by pressing and holding
TEST MODE switch inside coin door. From
Diagnostic Menu, choose SW ITCH TEST. Run
tests to confirm switch operation.
2.  Check for loose parts or wires caught in switch
contacts.
3.  Check continuity at each switch connection
(Common to Normally Open or Common to
Normally Closed).
4.  Verify that control operates properly by placing it
in...

Troubleshooting          6-10
Player Control Troubleshooting Table, continued
SYMPTOM CAUSE REQUIRED ACTION
Blocked or faulty fanW ith VGM power on, check airflow near each
computer fan. Case cooling fans are intake fans.
Power supply fan is exhaust fan. Assure that
nothing blocks airflow.
Faulty mechanical
partsTurn off VGM power. Open dashboard. Support
steering wheel and remove outer mounting
screws. Remove metal shield (if your VGM has
one) over motor. Inspect for faulty or worn belts,
bearings,...

Troubleshooting          6-11
Player Panel Controls
WARNING: 
The W heel Driver Board heatsink, power resistors, and other components
may be very hot. The DC Motor in the steering wheel may also be hot.
Steering Components 

Troubleshooting          6-12
Video Troubleshooting Table
SYMPTOM CAUSE REQUIRED ACTION
Power problemVerify connection of AC Power to video monitor.
Inspect CRT neck in dim light. Glowing filament
near CRT base proves that some monitor
circuits receive power. Still, voltages or signals
may not be normal.
Faulty wiring1.  Turn off VGM power. Verify that video signal and
Remote Adjustment Board connectors seat
properly on Video Monitor Board.
2.  Assure that video cables connect to circuit
boards and...

Troubleshooting          6-13
Video Troubleshooting Table, continued
SYMPTOM CAUSE REQUIRED ACTION
Floppy disk in driveCheck floppy drive for diskette. If you find disk,
eject it. Leave VGM power on. Turn off
computer. W ait for hard disk to stop spinning.
Turn on computer.
Faulty wiringLoosen computer case lid thumbscrews and lift
off cover. Assure that hard drive ribbon cable
connector is fully seated into mating connector
on motherboard. Check hard drive power cable.
Improper components1.  Verify that...

Troubleshooting          6-14
Video Troubleshooting Table, continued
SYMPTOM CAUSE REQUIRED ACTION
•  W hite areas at screen edges
appear tinged with color
•  Dots at screen edges
appear ovoid or cylindricalPicture tube dynamic
convergence is out of
alignmentHave service bureau dynamically reconverge
monitor. This procedure requires removing and
repositioning yoke. Service bureau must follow
instructions from monitor manufacturer.
Faulty wiring1. Check connectors and cables for wiring
continuity. Video...

Troubleshooting          6-15
Video Troubleshooting Table, continued
SYMPTOM CAUSE REQUIRED ACTION
•  Picture is too shortMaladjusted HEIGHT
pot or damaged
vertical circuit1.  Enter Monitor Patterns Menu. W atch Crosshatch
Screen while adjusting HEIGHT pot for best
picture. You’ll find this pot on Monitor Remote
Control Board, behind coin door.
2.  If pot has no effect, service vertical output circuit.
•  Picture seems shifted to one
sideMaladjusted
HORIZONTAL
POSITION potEnter Monitor Patterns Menu. W...

Troubleshooting          6-16
Miscellaneous Problem Troubleshooting Table
SYMPTOM CAUSE REQUIRED ACTION
Faulty fluorescent
tube1.  Remove fluorescent tube from its sockets. If you
find cracks or darkened ends, install new lamp.
Clean tube.
2.  Check continuity of both fluorescent tube
filaments.
3.  Verify that fluorescent tube operates by placing it
in working VGM.
Faulty lamp fixture Verify that lamp pins make good connection with
socket contacts.
•  Marquee lamp is intermittent
or non-functional
• VGM...

WARNINGS & NOTICES
WARNING
•  Use of non-Midway parts or circuit modifications may cause serious injury or equipment damage!
•  Use only Midway authorized components and parts. Failure to do so will void your warranty and may result in
incorrect or unsafe operation. Substitute parts or modifications may void the EMC directive or FCC type
acceptance.
•  Federal copyright, trademark and patent laws protect this game. Unauthorized modifications may be illegal
under Federal law. The modification ban also...