[sdiy] Slightly OT - TEK2213 problem

[Tim Parkhurst]

Hi Guys and Gals,

Sorry for the slightly OT post, but I've been given a TEK2213 o'scope and I
need to fix the little bugger. This isn't too OT, since this will be my main
tool for debugging and calibrating synths.

When I switch it on, there is a very faint sound that sweeps up in frequency
and repeats, somewhat like a VCO being swept by a sawtooth LFO wave. The
repeat rate is about once or twice a second. I'm guessing something has died
in the power supply. I'm also guessing that it's a switching supply, and
this is a common fault in switchers (because I've heard other dead
equipment, including TVs, make the same sound). I'm also guessing that I'm
not sure where to look next. I do have schematics... buried somewhere since
the last move... but I do have them. 

Any guesses?


Tim (yes, fixing the dead o'scope is project #4 of 275) Servo

"Imagination is more important than knowledge." - Albert Einstein





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