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

ScottishColin · 22nd Apr 2021, 7:46 pm

OK.

Working port (port 1) - pins reading from right to left from the top of the motherboard

PIn 1 - 0.33V
Pin 2 - 5.3V
Pin 3 - 0.28V
Pin 4 - 0.08V
Pin 5 - 5.21V
Pin 6 - 5.25V

Non working port (port 2) - pins reading from right to left from the top of the motherboard

PIn 1 - 0.36V
Pin 2 - 5.38V
Pin 3 - 6.03V
Pin 4 - 5.18V
Pin 5 - 5.21V
Pin 6 - 5.26V

So Pins 3 and 4 look strange to me.

Also note I retested Pin 3 on port 2 and it had climbed to 7.16V

Colin.

22nd Apr 2021, 7:46 pm	#1722
ScottishColin Octode Join Date: May 2012 Location: Perth, Scotland Posts: 1,822	Re: Non-working Commodore PET 3016 OK. Working port (port 1) - pins reading from right to left from the top of the motherboard PIn 1 - 0.33V Pin 2 - 5.3V Pin 3 - 0.28V Pin 4 - 0.08V Pin 5 - 5.21V Pin 6 - 5.25V Non working port (port 2) - pins reading from right to left from the top of the motherboard PIn 1 - 0.36V Pin 2 - 5.38V Pin 3 - 6.03V Pin 4 - 5.18V Pin 5 - 5.21V Pin 6 - 5.26V So Pins 3 and 4 look strange to me. Also note I retested Pin 3 on port 2 and it had climbed to 7.16V Colin.