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Old 14th Apr 2021, 2:10 pm   #1624
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,762
Default Re: Non-working Commodore PET 3016

Here's a link to a photo of the PET's version.

https://drive.google.com/file/d/1cO2...ew?usp=sharing

They're c. 9.30mm dia and 5.70mm high.

The actual contact is 4mm dia and c. 1mm high (not easy to measure).

Colin.


Quote:
Originally Posted by SiriusHardware View Post
I did find some potential replacement contact dimples, but it depends whether the original ones can be removed and are the same size. (#1603).

To answer Owen's question, yes, the 74LS145 was replaced and did have the hoped for effect, but there is also a secondary problem where some of the carbon contacts on the plungers are dead as well. Colin has tested every key position by using a known good key plunger to activate each one.
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