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

DigitalNoMore · 23rd Nov 2017, 8:27 pm

Hi Andy,

I've only just spotted this thread but in response to the supply voltages you've measured:

What I have so far...
I have the following voltages from the power supply :-
11.93V
4.79V
-5.06V
-12.06V

If the supply rail measuring 4.79V is the 5V supply rail to the processor and other logic circuitry then this could well be the cause of the problems you are seeing. Before going any further I would look to sorting this issue out.

Jerry

23rd Nov 2017, 8:27 pm	#25
DigitalNoMore Pentode Join Date: Jan 2013 Location: Nottingham, Notts. UK. Posts: 228	Re: Nascom repair - Looking for clues please Hi Andy, I've only just spotted this thread but in response to the supply voltages you've measured: What I have so far... I have the following voltages from the power supply :- 11.93V 4.79V -5.06V -12.06V If the supply rail measuring 4.79V is the 5V supply rail to the processor and other logic circuitry then this could well be the cause of the problems you are seeing. Before going any further I would look to sorting this issue out. Jerry