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SiriusHardware · 9th Oct 2021, 9:43 am

Having looked around a little bit more I expect that when you measure the AC voltage between JP8 pin 1 and JP8 pin 5 it will be about 15V AC. If you find that to be the case, measure the DC voltage on the screw terminals of the big offboard capacitor (Red meter lead on capacitor +, black meter lead on capacitor -). That should be approximately 9V DC.

Let us know what you find.

9th Oct 2021, 9:43 am	#8
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,586	Re: Commodore PET 2001 voltage regulators Having looked around a little bit more I expect that when you measure the AC voltage between JP8 pin 1 and JP8 pin 5 it will be about 15V AC. If you find that to be the case, measure the DC voltage on the screw terminals of the big offboard capacitor (Red meter lead on capacitor +, black meter lead on capacitor -). That should be approximately 9V DC. Let us know what you find.