Atarians Solinoids Strange Pulsing- Help!

1BillSacto

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Hi,
I hope someone can help me figure this out. I just picked up an Atari Atarians and it works fine except... when the flippers are energized and held energized- the solenoids start to pulse, off/on once per second for about a 1/4 second. I traced the circuit back through the drive transistor, through buffer, back to a 9334 Addressable Latch. The signal out of this latch, going to the solenoid (Q0) is a square wave, 60ish Hz @ around 10mv. I don't get this...

I don't understand what is causing the solenoids to pulse this way. It doesn't seem to me that it could be related to the signal I found at the 9334 (60 Hz). But I don't really understand that signal either.

Thanks for the help!

Bill
 
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