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Old 2nd Jan 2021, 7:58 pm   #14
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,485
Default Re: Non-working Commodore PET 3016

Nice photo. It shows that all the sockets which should have ICs in, especially the PROM sockets, do. The three empty sockets are for 'optional' ICs.

The voltage measurements on first reading do sound worrying, but, my apologies, I should have made clear that the measurements needed to be taken from the nearest of the three legs on VR6 to you, and from the right hand leads of CR10, CR11 and CR12 - not from just anywhere on the components which the red lines point to, but from the exact leg or lead which the red lines on the diagram in post #9 point to.

With that in mind, could you try those measurements again and see what you get this time?
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