Gottlieb Striker odd behaviors (system 80A)

mhkohne

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Donor 13 years: 2013-2025
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OK, I've got a Gottlieb Striker, and in the last few months it's started acting funny. The most noticable thing is that some of the playfield operations are happening (as if you'd hit a switch) when you hit the flippers. The most common one is a pair of lamps that switch back and forth between two spinners.

That's only supposed to happen when you hit certain targets or bumpers, but it's happening when hit the flippers.

Background note: This particular unit was originally overs seas. It still has the french sound ROMS in it, but someone converted it properly for US voltage long before I bought it.

What I've done:
(8-10 years ago) replaced the usual suspects on the power supply board - resistors, caps, transistors, etc, etc.

(recently)
replaced the base cabinet capacitors on the +12 (my unit has the alternate config in the schematic, so it's 2 x 6800 ufd caps)

Used a DMM on diode check to verify all the bridge rectifiers.

Used a DMM to verify all the transistors on the driver board.

Switch test didn't show any issues with any switches, nor did poking them with a dmm.

Performed ground mods per pinwiki, the old Clay guides, and flippers.com (basically, every board gets a ground wire back to the power supply cold plate, + extra ground wire from there down to the lower section + ground wire for the lock bar stuff)

Looked at +5 & +12 with DMM and didn't see anything out of the ordinary.

Tried to look at +5 with a scope, but my scope flaked out.


Now, the question is: what's next? Should I do the power supply board again? It's probably been a decade since I did it, but I wouldn't expect problems in that timeframe.

What else should I be checking?
 
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