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Old 1st Jan 2021, 10:12 pm   #9
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: Non-working Commodore PET 3016

Regarding IC pin numbering, yes that's right. Sorry to have had to ask, just trying to avoid telling you things you already know.

This attached detail from the layout diagram shows where to measure the regulated supply voltages, all with the black lead of the meter on 0V / GND.

I have attached it as a .jpg image and also wrapped up in a .zip file. The version in the .zip file is larger and easier to read.

Note that there are two +5V regulators, one +12V regulator and one -5V (minus five Volts) regulator. All of these voltages should be present when the machine is powered on.
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