Quote:
Originally Posted by cdmarion
I've got another bright / contrast pot from my parts set and will replace that tomorrow morning just to eliminate that as a probable cause.
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Chris,
The good news is, now that I've seen your schematic, your set does not seem to have the high level FM switch some same period Crosley's used that can create difficult to pinpoint intermittent problems.
When you unsolder the Brightness control
BEFORE YOU REMOVE THE SHAFT NUT, check for a slider to case short. Also check for continuity between the outside terminals and check the slider for continuity between both ends while rotating it. (It probably would not hurt to perform the same test on the contrast, before removing it.)
If no problem is found there, I'd suggest that before replacing any more parts, you take a couple of days off and then look at the set with new eyes, checking especially for correct wiring on items that you replaced after the mouse visit and using a bright light, for additional damage that was not noticed.
Your symptoms do not seem to point to a single failure and this causes me to suspect either a newly introduced wiring error, or unnoticed rodent damage.
If you have an oscilloscope, it might be a great help in this case as the design of this set causes many controls to interact unexpectedly.
James