Anyoe do Cr7000 repair?

XeD

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Dec 12, 2013
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Does anyone do CR7000 repair? I have one that I can't adjust the 0-4 and 4-8 filament voltage. 8-16 seem to adjust fine I have yet to test the other setting.
 
I would like to know also. According to one company I spoke with, nobody services them anymore because the unit has been discontinued for years and there are no parts available.
 
I have narrow it down to a faulty top board. Anyone that understand electronic/schematic want to help me pinpoint the problem?
 
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