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Old 1st Jan 2021, 8:44 pm   #4
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: Non-working Commodore PET 3016

No problem, we'll shift down a gear and try to explain everything more explicitly.

Just as a preliminary, can you have a look at this PCB layout diagram (attached below) and tell me whether that matches your main PCB? Ignore the fact that it is for a 3032, just confirm whether the board layout is the same, with the ICs and other parts in the same places as in your machine. Also ignore the red arrows, as they were already there on this image when found online. Identifying the PCB will help us to determine which circuit diagrams to work from.

Also, do you know how the pins on ICs are numbered? It may be necessary to ask you to to take measurements from pin(x) of IC(y), so we'll need you to know how to identify the correct IC pins to do that from.
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