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

ScottishColin · 17th Jan 2021, 5:39 pm

Hi. re post #133

Measured Pin 11 UG5 an have a steady 5.3V when powered on
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

re post #135
UG5 pin 14 - I get 16Mhz at 49.8%
UG5 pin 12 - zero reading
UH3 pin 3 = 49.97 @ 49.8% which I assume is background mains wiring?

re post #136
There seems no way to force the range of reading on this meter - it seems to auto-adjust and there are no buttons I can find nor is there anything in the (pretty sparse) manual.

17th Jan 2021, 5:39 pm	#137
ScottishColin Octode Join Date: May 2012 Location: Perth, Scotland Posts: 1,807	Re: Non-working Commodore PET 3016 Hi. re post #133 Measured Pin 11 UG5 an have a steady 5.3V when powered on 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 re post #135 UG5 pin 14 - I get 16Mhz at 49.8% UG5 pin 12 - zero reading UH3 pin 3 = 49.97 @ 49.8% which I assume is background mains wiring? re post #136 There seems no way to force the range of reading on this meter - it seems to auto-adjust and there are no buttons I can find nor is there anything in the (pretty sparse) manual.