UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

retromit · 8th Oct 2021, 4:10 pm

Hi. Many thanks for the reply.

I may have been lucky when replacing the video RAM as they were already socketed (white sockets), so the board hasn't been taken out. I've only a basic multimeter, but have recorded the following:

- AC across JP8 - pin 1 = 07.6, pin 5 = 07.6
- JP8 pin 4 = 1.84v (DC)
- JP8 pin 2 = 1.84v (DC)
- CR10 ringed side (left leg) = 1.83v (DC) and right leg = 0.58v
- CR11 ringed side (left leg) = 1.83v (DC) and right leg = 0.55v

As for the large capacitor, I'm unsure on how to test this. There looks to be two screw terminals on the right hand side (looking at it).

Please forgive any naivety on my part as I'm still a novice, but trying to learn!

8th Oct 2021, 4:10 pm	#4
retromit Pentode Join Date: Oct 2021 Location: Falkirk, Scotland, UK Posts: 140	Re: Commodore PET 2001 voltage regulators Hi. Many thanks for the reply. I may have been lucky when replacing the video RAM as they were already socketed (white sockets), so the board hasn't been taken out. I've only a basic multimeter, but have recorded the following: - AC across JP8 - pin 1 = 07.6, pin 5 = 07.6 - JP8 pin 4 = 1.84v (DC) - JP8 pin 2 = 1.84v (DC) - CR10 ringed side (left leg) = 1.83v (DC) and right leg = 0.58v - CR11 ringed side (left leg) = 1.83v (DC) and right leg = 0.55v As for the large capacitor, I'm unsure on how to test this. There looks to be two screw terminals on the right hand side (looking at it). Please forgive any naivety on my part as I'm still a novice, but trying to learn!