On 2012-09-05 17:17:05 +0200, John said:

Digital multimeter and ESR meter ...
I checked cabling against IBM manual.

often with these 3842 controlers, I change the small cap (often 10uF)
around this chip between v+ and v-
it has very often solved the problem...
and it checks good on esr meter ...

but if you have no voltage around the chips it must not be that...

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