Re: 2236 Focus range.


Alex
 

This is a well known and documented problem in the 22xx line. There is a string of 5 (or 6) 510K resistors that over time change value and produce the focus problem in some cases even going off the potentiometer adjustment range. Just replace all resistors with metaI film types and 1-2W rating, and also make sure that each resistor is rated to handle at least 300V or more. Don't have any specific knowledge of the 2236, but for sure had to replace these resistors in two separate 2213A which basically are the same in this sense. Do a search here and I am sure you will find many other messages referring to this particular problem.

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