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

ScottishColin · 17th Jan 2021, 6:57 pm

Apologies I didn't make it clear. These readings were all with the chip out and plugged into a breadboard I have:

"Measured (black) pin 8 UG5-> pins 2,3,6 & 7 UG5;
0 resistance when powered off
Measured (red) pin 16 UG5 -> pins 2,3,6 & 7 and have
2.19 MΩ on 2 & 3 and 2.4 MΩon 6 & 7 when powered off"

When I said 0 resistance, the meter showed no reading and stayed at '0'.

I've tried both chips with pin 7 out of the way and get the same result.

I will try to source another meter and see what readings I get and come back to you.

Thanks.

17th Jan 2021, 6:57 pm	#139
ScottishColin Octode Join Date: May 2012 Location: Perth, Scotland Posts: 1,821	Re: Non-working Commodore PET 3016 Apologies I didn't make it clear. These readings were all with the chip out and plugged into a breadboard I have: "Measured (black) pin 8 UG5-> pins 2,3,6 & 7 UG5; 0 resistance when powered off Measured (red) pin 16 UG5 -> pins 2,3,6 & 7 and have 2.19 MΩ on 2 & 3 and 2.4 MΩon 6 & 7 when powered off" When I said 0 resistance, the meter showed no reading and stayed at '0'. I've tried both chips with pin 7 out of the way and get the same result. I will try to source another meter and see what readings I get and come back to you. Thanks.