Make sure it's not the IDC connector, and that you don't have loose wires in the connector itself.
(Topic ID: 203705)
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Twilight Zone
Bally, 1993
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Quoted from Seatmandan:I went through and re-seated the IDC wires in the connector, and it seems good. I think that the pressing on the connector to trip the switch row on or off was in the pin header, but still not 100% sure. Could the IDC connector sleeves buried in the plastic that slide onto each pin (8 of them) be bad?
Check Zaaza's continuity test, and then check for cold-solder joints, as well.
It will only by the 10 opto board if - when the switches all go dark, the Upper Left 5 Mil target does NOT respond. If it DOES respond, then the opto board's dropping out of the circuit. (Losing power, etc.) Though, pressing on the MPU won't change that, so the opto board is likely fine.
1 year later
If the wires were in the wrong order, you would have a LOT MORE issues than just that one or two switches.
Well, in switch test, does the opto show open or closed?
If closed, when you wave your hand between the sensor, does it switch at all?
If it's open, then the opto (or receiver) is not getting it's power/signal from the Opto Driver board. Could be a broken wire, bad crimp on the pligs on the opto board, or a bad LM339 on the opto board. (Or, the opto could just be dead.)
If it's closed, and it opens when you wave your hand through it, then.. well, it's working. 
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