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Old 03-26-2017, 07:47 PM
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DavGoodlin DavGoodlin is offline
Motorola Minion
 
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 3,400
Convergence board rectifiers

The fleshtones can be found near the center of the tint range now. Earlier versions of this chassis used a variable capacitor for tint. Id like to post a picture but one single issue remains.

After getting focus back and a very interesting color stage alignment using a VTVM per the TAB manual written by Robert Goodman, it seemed like the convergence pots did not straighten out the red green vertical bars.

They are only in at the center but diverge greatly at the top and bottom.

After checking the VOT and convergence yoke and finding continuity, I suspected a control that had no effect and it too was OK.

I then unsoldered the multisection selenium rectifier and found one section shorted. A separate top-hat style rectifier was also shorted.

Question: can the selenium block be subbed with 3 standard rectifiers?
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Last edited by DavGoodlin; 03-26-2017 at 08:02 PM.
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