(Topic ID: 281333)

Indiana Jones

By RCSP

3 years ago


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  • 13 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by RCSP
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w89_cpu_power_distribution.jpg
trace U20-U16.jpg
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#4 3 years ago
Quoted from RCSP:

How would this wire get all the way to the coin door?

ij_J212.jpgij_J212.jpg

If nothing works in that column consider verifying the problem is NOT on the CPU board.

1 week later
#7 3 years ago
Quoted from RCSP:

The coin door buttons do not work. Should I check my soldering on the U20 socket?

U20 has nothing to do with the direct switches that are in your coin door.

#10 3 years ago

Here. This might help you. It's not from an original Williams (it's a TwoBits) but it should work. Follow the aqua (light blue) lines.

w89_cpu_power_distribution.jpgw89_cpu_power_distribution.jpg
#12 3 years ago

I don't think the capacitor is bad. You probably removed the plated through hole for pin #10 when you removed the original ULN2803 IC. Test for continuity from the pin on the pad at the back of the board with the socket on the front of the board. Zaza has pointed you at the exact spot.

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