Doctor Who
 |
| Manufacturer | System | Year | Model | Produced |
|---|---|---|---|---|
| Bally | WPC-Alphanumeric | 1992 | 20006 | 7,752 |
Doctor Who Playing Tips and Rule Sheet
1 WPC Specific Issues
2 Game-Specific Issues
2.1 Time Expander Opto "Mushroom" Failures
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.
An excellent guide to mini-playfield problems, fixes, operation and rebuilding located here.
Original documentation can be found here.
2.2 Time Expander Will Lock Only One Ball
If the "Mushroom" opto switches all fail, then the game software adjusts by never allowing more than one ball to lock. Once a ball is locked in either the left or right lock hole, subsequent balls shot into the other lock hole will be immediately kicked out.
Return to Williams WPC page.