Re: Panasonic SA-HE200 receiver/amp -- overload - update

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@nospam> wrote in message
news:25adnVRkzNm5qQXZnZ2dnUVZ_uydnZ2d@xxxxxxxxxxx
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










.

Relevant Pages

  • Re: whats wrong with tar? -need advise!
    ... In article, Mark A wrote: ... > I have been working in IT for over 25 years and very frequently refer to ... > manuals and books. ...
    (linux.redhat)
  • Re: Miller Tunderbolt help please
    ... adjustment crank within that range. ... Thunderbolt but it does not have these. ... It has a hand crank on top to adjust the amps. ... Lists eleven models of Thunderbolt manuals. ...
    (sci.engr.joining.welding)
  • Re: Can I have 2 content versions of 1 document in 1 file?
    ... In what way is there 'too much text to format as hidden'? ... Otherwise, you might use a colour, style or bookmark to mark the optional ... > In practical terms I have two manuals. ... suppressing some of the text in one version. ...
    (microsoft.public.word.docmanagement)
  • Re: Panasonic SA-HE200 receiver/amp -- overload
    ... Has anyone had experience with this symptom or do you have a service ... there are no stray bits of speaker wire shorting the terminals and checked ... I'm still thinking it's an output IC, in spite of your voltage readings, but ... Panasonic service manuals typically aren't too expensive - their US phone ...
    (sci.electronics.repair)
  • Re: Miller Tunderbolt help please
    ... It has a hand crank on top to adjust the amps. ... Lists eleven models of Thunderbolt manuals. ... "If I'm going to reach out to the the Democrats then I need a third ...
    (sci.engr.joining.welding)