UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

Mark1960 · 13th Mar 2021, 12:45 am

For the effort required to try and test the video ram compared to replacing the buffers and ram, I think I’m close With Sirius for the next steps.

Remove and socket UE7 and UE8, but do not fit the buffers.

Check the video pattern again without the buffers.

If the video pattern is random then fit the buffers to the sockets.

If the video pattern is not random, remove and socket UF7 and UF8 and replace with 2114 or equivalent.

I’m being a bit overcautious, but don’t think we should fit new buffers if the ram is still suspect.

I’d recommend cricklewood for the 2114s, but I could also send a set from my spares box, though I don’t have a system to test them in first and its a slow trip from Canada.

13th Mar 2021, 12:45 am	#1002
Mark1960 Octode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 1,294	Re: Non-working Commodore PET 3016 For the effort required to try and test the video ram compared to replacing the buffers and ram, I think I’m close With Sirius for the next steps. Remove and socket UE7 and UE8, but do not fit the buffers. Check the video pattern again without the buffers. If the video pattern is random then fit the buffers to the sockets. If the video pattern is not random, remove and socket UF7 and UF8 and replace with 2114 or equivalent. I’m being a bit overcautious, but don’t think we should fit new buffers if the ram is still suspect. I’d recommend cricklewood for the 2114s, but I could also send a set from my spares box, though I don’t have a system to test them in first and its a slow trip from Canada.