Dr.Dude need a doctor

arakisssun

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Varna, Varna, Bulgaria
Some stupid thing is happen:)
After good cleaning of the pinball-full deassamble and after that assembl,I have problem with one lapm:)
This is lamp "37"(555).It's the red one on the guitar plastic.It works very strange.It work without problem in attract mode,when you start multiball,when there have animation with the all lamps in background,but in normal play-when must colour the red lights,the lamp not work.It stay off.I don't understand what is this stupid thing:).After game over,in attract mode the lamp turn on an flashing normal with the others.

I check 4001 diod and replace it but with no luck.I check all connection and it's fine.I begin to think is some chip or transistor on MPU board that control the bulb.But can it be some program error-some EPROM?
 
I see now something interesting too.
When run the test-all lamps-the red one(with the problem) flashing normaly,but the lamp that is on the "DUDE JACPOT" plastic is off-but in game and attract mode work without problem.The two bulbs go trought one connector.I measure theier drive transistors and chips,but they are ok.I think that the connector(short)or the PIA.What do you think?
 
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