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IFR Com 120A destortion meter error at boot-up

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sfoweatherman:
Question:
During my Com 120A boot-up/initialization, it reports an error on the screen regarding the distortion meter. If you go into the test procedures, and do the full test, the message on the destortion meter says: PASS. I've been told that it is a capacitor problem. If that is so, would the problem be on the controller tray?
Thanks in advance,
David

M0HZH:
Hello,

Indeed, it is most likely an issue caused by a failing capacitor. The Baseband Tray handles the distorsion meter function (as well as other functions, which you might see fail soon) and it was plagued by a batch of bad capacitors. Just take the tray out and replace all of them, about 50 pcs. I also did the Digital, Analyzer and Generator trays on my IFR COM120B.

Let me know if you need documentation, I have the manuals & schematics.

Cheers,
Razvan

sfoweatherman:
Thank you sir for the info. I will asses the board. Since the caps are all extra mini in size, I'll try to find the culprit...David

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