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Old 16th Jan 2021, 9:25 pm   #131
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

Sorry to have to ask again, but can you (with power off) check between UG5 pins 7 and pin 8 for a short, and between UG5 pins 7 and 16 for a short?

If no short on either of those, remove UG5 from its socket, GENTLY bend pin 7 out to an angle of about 45-60 degrees so that it is slanting out sideways and then put the IC back in its socket with every pin fitted in its hole except for pin 7, which should be hanging out over the side of the socket.

Power on again, now do you see 1MHz on UG5 pin 7?
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