Midway Off Road Thunder Operation Manual

Servicing          5-5 • 
Dollar Bill Validator
 (Use MARS AE2451-U3E, UL-recognized currency changer)
  You can install dollar bill validators in VGMs manufactured with the additional wiring connector. As
this manual goes to press, this VGM only supports the Mars model AE2451-U3E validator.
 
  Switch off power to the VGM and unplug the AC line cord. Unlock the coin door and swing it open.
Read the coin door label for additional information.
 
  Remove nuts, spacers, and the cover plate from the door....

Servicing          5-6 MICROPROCESSOR FAN. 
Dis-
connect the DC power cable from
the floppy drive. Unplug the
ribbon cable from the floppy
drive. Leave the other end of the
cable attached to the CPU Board.
Unscrew and remove the circuit
board retention bars. Remove the
drive bracket mounting hardware.
Remove the bracket and drive.
Disconnect the fan’s power
harness. Remove the
microprocessor cartridge.
Squeeze the plastic end tabs on
the fan side of the cartridge.
While squeezing, carefully pry the
fan...

Servicing          5-7 • 
Gear Shift
Switch off power to the VGM. Unlock and remove the rear door. Disconnect the two cables from the
back of the shifter. At the front of the shifter, remove shift plate mounting screws. Lift the shifter up
and out of the player panel.
• 
Hard Disk Drive
CAUTION: 
Hard disk drives are very fragile! Handle them with care. Keep disk
drives away from magnets, heat and vibration. Don’t move a VGM with the power
on.
CAUTION: 
Don’t stack or drop hard disk drives. Use an...

Servicing          5-8 • 
Microprocessor
This VGM’s microprocessor is in a postcard-size cartridge that also includes cache RAM. The
cartridge is inside the Arcade Computer, near the DIMM sockets. Switch off power to the VGM.
Remove the cabinet rear door. Remove the back of the Arcade Computer. Unplug the ribbon cable
from the floppy drive. Leave the other end of the cable attached to the CPU Board. Unscrew and
remove the circuit board retention bars. Remove the floppy drive mounting bracket. Remove the...

Servicing          5-9 handle it only by its edges. Don’t touch the copper traces! Use anti-static bags and protective
containers to store the board if you won’t reinstall it.
• 
Power Supply
CAUTION:
 Replace the power supply only with a Midway approved power supply.
Make no substitutions. Otherwise you will void the UL and CE listings on your
video game machine. Non-approved power supplies can pose shock and fire
hazards to players and service personnel.
Switch off power to the VGM. Disconnect the line...

Servicing          5-10 • 
Video Board
Switch off power to the VGM. Unlock and open the rear door. Remove the back of the Arcade
Computer. Loosen the header-mounting screw. Disconnect the video cable from the board header
connector. Remove the circuit board retention bars. Remove the board. As you remove the board,
handle it only by its edges. Don’t touch the copper traces! Use anti-static bags and protective
containers to store the board if you won’t reinstall it.
• Wheel Driver Board
Switch off power...

Parts          7-1



	
TM




PARTS
WARNING: 
Use of non-Midway parts or circuit modifications may cause serious injury or
equipment damage! Use only Midway authorized parts.
For safety and reliability, don’t substitute parts or modify Midway products. Substitute parts or
modifications may void the game’s EMC directive or FCC type acceptance.
NOTICE: 
The term VGM refers to the video game machine. 

Parts          7-2
Cabinet Front View
03-8252-5
08-7980
31-3423.1-2
08-7853
03-9932.1 5675-16273-00
04-12760-1
04-12760-2
23-6723 01-15084A-22506
31-3418.2
A-23231 31-3423.1-1 

Parts          7-3
Cabinet Rear View
01-10714
03-8326 

Parts          7-4
Cabinet Joining Details
4700-00033-00B
4701-00005-00
4320-01124-16
04-10112
4020-01100-20