WH20 Errors

eh97ac

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Just got these new switch errors and I tried replacing 2 optos. The new optos didn't change the errors.

Should I start in the backbox or the opto board?
 

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Did you check the old or new optos in switch test ?

And if not working could be a lot of things. New optos could be bad or wiring to them not right. ( optos don't all have the flat spot or mark in the same spot ) you could check if power is getting to them.

Ad they are part of your switch matrix, a broken wire at another switch can effect them.

LTG :)
 
Old and new optos both worked in test. Used the ball to test them.

The whole column is out (the one switch in the pic is not used) so I am suspecting something on the board....but where to start?
 
Disconnected the opto board and the column disappeared. Should I just replace both chips on the opto board???
 
Swapped wires between J207-5 and J207-6. The bad column moved from Col#6 to Col# 5.
 
Replace U20 and the bad column disappeared.

I'll tackle the last few errors later.
 
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