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Old 13th Apr 2021, 3:27 pm   #1588
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,762
Default Re: Non-working Commodore PET 3016

OK - I've narrowed down the keys with problems to one trace. None of the keys attached to this trace work.

As far as I can see, the issue is in the (I'm sure these are the wrong words) jump trace on Pin I of the attached picture - the one that starts just below where the cable actually is and rejoins between \ and (.

I have continuity from one end of Wire I to the other. I have continuity from the solder point of wire I to just before the 'jump'. I have continuity from after the 'jump' to all of the affected keys.

I've attempted to circle it here. I believe that I should have continuity between the two ends of the jump - is that right?

Colin.
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