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'78 Bally Playboy no feature lights
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the_tinker
First off thanks for the add. My first post here.
Helping a friend fix a 1978 Bally Playboy. Got the machine to wake up with a new rectifier board. Two of the voltage were
half wave rectified. All looks clean now (I have an o-scope).
Everything seems to work except the playfield lights. GI is on, counters work, self test runs trough each step.
If I put +5v on the gate of the SCRs I can light the corresponding feature light so I know the SCRs are ok.
I can't believe all the decoders are bad. I don't see clean, square pulses on the A0-A3 pins. Looks more like a
saw tooth.
Anybody every see something similar on these era Ballys? I'm still searching through the threads.
Thanks,
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