Twilight Zone
Bally, 1993You're currently viewing posts by Pinsider Madmax541.
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Unplugged J208 get the following errors
Row 4
Ball popper opto
Clock is broken
I was getting ball popper opto and clock broken errors before.
Problem in CPU.
Just clarify
With J208 connected all are gnd to short
Row 1
Row 3
Row 4
Row 5
Row 6
Row 7
Row 8
Clock is broken
Ball popper Opto is stuck
With J208 disconnected error is
Row 4 gnd to short
Clock is broken
Ball popper opto is stuck
No row or column 9
Quoted from zaza:And when you disconnect J212 ? still GND short row 4 ?
With J212 & J208 disconnected
Check fuses F114 & F115
No row 4 error
Quoted from zaza:Could be a ground wire against the 'plumb bob' but also a problem with column2 that keeps row4 low through switch #24 'always closed' is a possibility.
Check with a jumper wire the columns and rows on the CPU-board
https://pinside.com/pinball/forum/topic/wpc-89-cpu-board-info#post-3872333
Doing this test shows gnd to short where all sw in row are activated
Check F114 & F115 both are good.
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Ontario, CA