Powerup Problems

Symptom

Probable Cause

Solution

No reaction when game is

Blown fuse

Power supply is too high. Power

turned on

should be between +5v & 5.2v.

(Measured on the circuit board.)

Cabinet is not connected to earth

ground. (All metal should be

connected to the earth ground.)

Short between power and ground.

Check for foreign material.

Disconnect the harness and

measure the resistance between

power and ground. It should read

around 600 ohms. (0 ohms is a

dead short.)

Make sure the harness is not

shorting to anything, such as bare

or frayed wires shorting out each

other or hitting bare metal.

No power from the power

Replace power supply.

supply

Power supply

Power supply too low. (should

ideally be between +5v & +5.2v.)

(Measured on the circuit board.)

Short on the board

Check for loose or foreign material

on the board.

JAMMA harness connected

Identify Pin 1 on the JAMMA

improperly

connector and on the PCB. If

installed incorrectly, damage to the

PCB may have occurred.

Screen flashes repeatedly

Open on socketed IC's

Check for bent pins on socketed

parts.

Make sure that all IC's are seated

in their sockets properly.

+5v setting too low

Check voltage. (Measured on the

circuit board.)

DIP switch on the memory

Make sure dip switch #1 and # 2

board may not be set correctly.

are "ON", and #3 and #4 are "OFF'

on the memory board.

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