(Topic ID: 285774)

Pinbot burnout

By Croppie1Kenobi

3 years ago



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#1 3 years ago

Had a mild meltdown on Pinbot today. Looks like 1J6 pin 8 got hot and burned trace. Q86 transistor looks like it’s toast according to the DMM. The other area burned is starting from ground pad and going to leg of Q 79, Q77, Q75, Q69, Q71 and Q73. Those transistors check out ok. Got to be a wire problem I felt so I traced every wire from the MPU no joy. Pulled playfield and searched for any solenoid wires touching where they shouldn’t nada. Really at a loss. Any suggestions?

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#4 3 years ago

Found it! The red-vio somehow worked its way under a nit and eventually the insulation was worn away. This bracket was going to a solenoid. One more problem to sort out. Blowing a flipper board fuse when right flipper button pushed.

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#5 3 years ago
Quoted from RatShack:

What coil is on that output? The trace was probably not rated for the constant current after the transistor locked on.

That red-vio wire had 34VDC coursing through it. The transistor popped and the trace burned.

#7 3 years ago
Quoted from GRUMPY:

Looks like its over fused too.

Pic of the flipper coil?

Swapped the flipper coil to the other side and same problem. Swapped in new flipper coil and now all better. Thank you.

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