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SiriusHardware · 9th Oct 2021, 9:37 pm

I see that your post #9 was pending, not yet visible, when I posted #10, sorry about that. I'm going to have to allow more time for your replies until you get clear of new user moderation.

Given your previous observations can you now make measurements - with the power on - between the following points marked up on one of your PCB images?

AC volts, one probe on 'X', the other probe on 'Y', voltage =?
DC volts, Black probe on 'W', Red probe on 'Z', voltage =?

You might have to scrape a clean area on each of those diode legs (with the power off) in order to get a good connection, as they look rather dull.

9th Oct 2021, 9:37 pm	#12
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,587	Re: Commodore PET 2001 voltage regulators I see that your post #9 was pending, not yet visible, when I posted #10, sorry about that. I'm going to have to allow more time for your replies until you get clear of new user moderation. Given your previous observations can you now make measurements - with the power on - between the following points marked up on one of your PCB images? AC volts, one probe on 'X', the other probe on 'Y', voltage =? DC volts, Black probe on 'W', Red probe on 'Z', voltage =? You might have to scrape a clean area on each of those diode legs (with the power off) in order to get a good connection, as they look rather dull. Attached Thumbnails