[sdiy] Slightly OT - TEK2213 problem

[Paul Schreiber]

I know! (raises hand)

The switching power supply is trying to 'soft start', but there is a short on 
one of the outputs (or it *thinks* there is).

Paul S.

----- Original Message ----- 
From: "Tim Parkhurst" <tparkhurst at siliconbandwidth.com>
To: "SDIY" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, February 11, 2005 6:54 PM
Subject: [sdiy] Slightly OT - TEK2213 problem


> 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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