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Old 17th Mar 2021, 8:31 pm   #1102
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,762
Default Re: Non-working Commodore PET 3016

Meter set at 20K.

Measure from +5V (red lead on +5V) to each of

UI10 pins 8-9 - 2.25
UI10 pins 6-7 - 1.64
UI10 pins 4-5 - 2.33
UI10 pins 2-3 - 1.65
UI11 pins 8-9 - 2.37
UI11 pins 6-7 - 2.20
UI11 pins 4-5 - 2.33
UI11 pins 2-3 - 1.65

Did you mean black on 0V (eg Pin 8 pad on UG4) for the second set of readings? If so, then I can't get any reading at all for those pins.

Scope readings coming.

Colin.


Quote:
Originally Posted by SiriusHardware View Post
Slightly confusing because you have done half of them to +5V and half to 0V, unless I am misunderstanding your results. To clarify:

Measure from +5V (red lead on +5V) to each of

UI10 pins 8-9
UI10 pins 6-7
UI10 pins 4-5
UI10 pins 2-3
UI11 pins 8-9
UI11 pins 6-7
UI11 pins 4-5
UI11 pins 2-3

And report the results, then measure from 0V (black lead on 0V) to each of

UI10 pins 8-9
UI10 pins 6-7
UI10 pins 4-5
UI10 pins 2-3
UI11 pins 8-9
UI11 pins 6-7
UI11 pins 4-5
UI11 pins 2-3

..and report the results.

Regardless of what you find, could you please also do the scope comparison between these eight pin pairs as well. Doesn't have to be tonight, take your time.
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