[time-nuts] Anyone familiar with SR-620 repair?

[J. Forster]

I should have added that you can get a pretty good idea of whick branch on
a PCB is drawing current by probing along the trace. This is especially
useful if the rail has a bunch of branch distribution lines.

Also, if the three-terminal regulator is overheating, disconnect it and
power just that rail from an external, current limited supply of a volt or
two. That way you don't risk trace damage.

Best,

-John

================





> My SRS SR-620 counter died last weekend.  After superficial
> troubleshooting, it looks like there's probably a short on one of the
> power supply rails.  Symptom is that nothing lights up when power is
> turned on, but one or more of the three terminal regulators gets very,
> very hot (can't tell which one since they're all bolted to the side rail
> as heat sink).  The unit had been running continuously for several weeks
> when the failure occurred.
>
> I just learned from SRS that they charge a flat rate 25% of the current
> list price for repairs!  (To be fair, if you're the original purchaser,
> it's only 20%.)  The SR620 currently lists for about $5K, so we're
> talking about a mighty expensive shorted cap (if that's what it is)!
>
> Anyway, has anyone here troubleshot an SR-620 with a problem like this,
> or have any general insights about working on one of these beasts?
>
> Thanks,
>
> John
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>