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Time and Date Not Set.
The real time clock is not running. If this occurs go to U.4 of the Utilities Menu and set the time
and date.
Factory Settings Restored.
This message indicates that the CMOS RAM no longer retains any custom Pricing or Game
Adjustment settings and has reverted to factory default settings. Generally, the following CPU
checks will isolate the cause of the CMOS RAM memory failure. The voltage at pin 28 and pin
26 of U8 should be +5V (game turned On) and at least +4V (game turned Off). When the
voltage drops below +4 V, memory reset occurs. Check the batteries and battery holder. Be
sure that the batteries are good and that there is no contamination on the battery holder
terminals. Turn the game OFF, and use an ohmmeter to check diodes D1 and D2 on the CPU
Board. D1 should read 0 ohms when forward-biased and infinite ohms when reverse-biased.
D2 should read 15 ohms when forward-biased and infinite ohms when reverse-biased.
Note:
Readings taken from Analog Meter. This message can also indicate that there is an open diode
on a 50V coil, and noise is entering the circuit.
Trap Door Down Error
Trap Door Up Error
The Trap Door did not get to its intended position. Go to "T.12 Trap Door Test" and check the
"TRAP DOOR DOWN" switch, the Trap Door linkage, and the coils for proper operation.
Mini-playfield Error - C.W. Direction Reversed
Mini-playfield Error - C.C.W. Direction Reversed
Mini-playfield Error - No C.W. Movement
Mini-playfield Error - No C.C.W. Movement
The Mini-playfield has a problem positioning itself.
The abbreviations C.W. is clockwise direction, C.C.W. is counter clockwise as viewed from the
front of the game. If both reversed errors occur, the DC motor is wired backwards.
If only 1
reversed message occurs, the motor direction driver is stuck on/off (loose wire?).
No movement in both directions can be a fuse or loose wire from the motor. No movement in
one direction can indicate a loose wire, binding playfield, or a defective motor controller board.
Examine Left Jet Bumper Switch
Examine Right Jet Bumper Switch
Examine Bottom Jet Bumper Switch
The game detected an unusually low number of hits on the indicated jet bumper.
Examine
and/or adjust the switch while in diagnostics. The error message(s) are removed when any jet
bumper is hit during any diagnostic mode.
DOCTORWHO 1-46