Odd Dr. Who issue - rebooting when left flipper used 3x

Malice95

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Odd Dr. Who issue - rebooting when left flipper used 3x

So My doctor who reboots in the middle of gameplay when the
left flipper is energized 3 times in a row without the ball hitting
another solenoid. This is a odd one.. The game plays fine otherwise.

I went into test mode and testing all the solenoids they all work
but if I let the left flipper cycle 3 times in test mode in a row, the whole
pin reboots.

Any idea where to begin?

Thanks, Mike
 
Have you looked at the diodes on the coil. That causes resets. Not to mention bridge rectifiers. If you're using the left side, that's two coils at once. This could be it, too.
 
It could be a flaky diode on one of the left flipper solenoid coils, but it is very probable that it is a low-5volts-to the CPU-reset issue.

If you want a repeatable case, start multiball and chimp-flip all three flippers at the same time (to draw as much power as possible all at once). That will cause a marginal 5volts to drop below the watchdog threshold an the game reboots.

Test the 5volts on the test point on the WPC power-driver board, and also on the lower leg of the capacitor on the CPU board just where the 5volts comes in from the connector from the power-driver board. That can narrow the issue down to the power-driver board or the connector from the power-driver board to the CPU board.

http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Game_resets

http://www.actionpinball.com/tech/reset.htm#wpc

RussMyers
 
Not to Jack the OPs thread, but my DR Who start this as well. Well not 3 flipper reset, but a random one.

So far the only things I've done is check the +5 it appears solid, but I'm still monitoring.

I've reseated all the connectors in the backbox. Problem hasn't returned yet.

Next I'll problably pull all the boards, check the headers, and continue monitoring the +5

The multiball trick on mine anyways didn't show any problems. But that will pull some current so if it's a bad power supply it should show it.
 
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