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Old 5th Mar 2021, 8:02 pm   #804
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,804
Default Re: Non-working Commodore PET 3016

UH6/12 has the same waveforms and frequency as UH3 pins, but there's nothing on UH6/3, nor on UH6/2.

UH6/13 voltage is 5.00V.

UH6 voltage is 5.04V.

Colin.


Quote:
Originally Posted by SiriusHardware View Post
You have activity on UH6 pin 12 but not on UH6 pin 3, correct? What about UH6 pin 2?

Also check voltage on UH6 pin 13 (should be high, steady ~5V).

Also check supply voltage to UH6 on pin 7 (0V supply pin, black lead) and pin 14 (+5V supply pin, red lead).
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