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From: Michael on 26 Jul 2006 07:10
With the schematic in hand the problem was positively traced to a defective
overload/overheat circuit within one of the two three-channel IC's.

Mark Z, you were correct, and yes, the manuals are very reasonably priced.
Thanks.

Michael


"Michael" <noreply(a)nospam> wrote in message
news:25adnVRkzNm5qQXZnZ2dnUVZ_uydnZ2d(a)magma.ca...
> This Panasonic SA-HE200 Receiver/Stereo/Amp came in with the display
> indicating "overload" and "turn power off" a few seconds after the power
is
> turned on.
>
> Has anyone had experience with this symptom or do you have a service
> manual/schematic?
>
> Some background:
>
> According to the owner's manual, the panel indication suggests a shorted
> speaker terminal, too low impedance speakers, overdriving, or high heat
> conditions, all problems at or after the final amps. However, the symptom
> appears on a cold start up without any external connections. I've ensured
> there are no stray bits of speaker wire shorting the terminals and checked
> back to the main pcb for shorts.
>
> The intregrated outputs (IC 601 and 602) are 24 pin RSN310R37
multi-channel
> mosfets. I did a left-right channel terminal-by-terminal check of
> resistance and voltage and they are the same (of course, it could be a
> problem common to both). Main power to the amps is plus and minus 56V,
> consistent with the 63V filter caps. I have not been able to find any
data
> on the mosfet IC.
>
> Michael (C.E.T.)
>
> please post reply, thanks
>
>
>
>
>
>
>



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