Williams WPC

Note: This page is a work in progress. Please help get it to a completed state by adding any useful information to it.

1 Introduction

Put system info here

2 Games

Put list of games that used this system here (including anything that might not have been pinball)

3 Technical Info

The WPC Transformer

4 Problems and Fixes

4.1 Power Driver Issues

This may not apply to some, as MPU might have been part of it.

The WPC System Boardset and History

Fixing Resets in WPC Machines

4.4 Display Driver Board

Possibly doesn't apply to some, can't think of an example.

5 Game Specific Problems and Fixes

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5.1 Doctor Who

The time expander in Doctor Who can be very problematic - the opto boards crack and prevent the mushroom targets on the 2nd level of the time expander from working properly. Often the boards can be fixed with jumper wires and resoldering, and there are aftermarket boards available to replace both. Additionally, the plastic carrier the optos are attached too can warp, preventing the warped section from working. Finally, there is a cardboard shield attached to the carrier that prevents stray light leakage from affecting the optos (most notably during the Davros rounds). If it is missing usually you cannot complete the round as the light from the lock lamps prevents the optos from turning off.

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5.2 The Shadow

Fast shots to the lower phurba ramp diverted to the right sometimes get stuck because of the switch wireform hanging the ball up. One way to fix this is to get a replacement microswitch with a long wire actuator, and bend it so the activation occurs much later down the wireform ramp, as shown in this photo: Media:shadowswitch.jpg

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5.3 Star Trek: TNG

There is a thin wire running from the 8 driver board (right side of backbox) to the single drop target reset coil on the playfield. Make sure this wire is present and secure, as coils will lock on if not. Replace this wire with a thicker variant to help prevent it breaking from vibration and stress.

You might remove the three wires from the lug ( purple wire/green stripe, the thin one looks more lavender) and solder to a single wire and solder the single wire to the coil lug. that way if it ever breaks off from vibration, the three stay together and don't knock out a transistor on the small driver board and lock on a subway coil.

5.4 Indiana Jones

The front right switch on the path of adventure gets hit underneath by ball hits. This shorts the wires/diode/switch lugs. This switch is on the same row or column as the ball jam opto. This is the last opto a ball goes by going up to the shooter lane. So if you are getting extra balls kicked up to the shooter lane, that front right switch is a good place to start. LTG :)

6 Repair Logs

Did you do a repair? Log it here as a possible solution for others.

Medieval Madness

If your draw bridge is acting up. Check the pivot points, they get peened by ball hits and can distort and bind. A bit of work to take apart, they can be flattened or filed to make a smooth pivot point again. LTG :)