[Mark D. Zacharias]

kiwianalog wrote:
"Powell" wrote in message
...

This integrated amp operates normally for about
three minutes then abruptly buzzes and goes offline
(no sound but power light indicating online). If
immediately restarting amp resumes online power light
but no sound. After a longer cooling down period and
then re-powering the unit, it will go back online and play
over the speakers only to shut-down (no sound/power
on) after about three minute of normal play.

Any methodologies to diagnosis or identify the
source of problem would be helpful? The shortwave
radio back-up isn't making for me in the weight
room.



Open it up and turn it on from cold until it shuts down then quickly
feel all the transistors, mosfets or what ever it uses, if one is
really hot then this component may need replacing, be careful of your
fingers though, don't get burnt. This is a real quick and dirty
method that with luck will solve your problem otherwise it will
require more expertise that can be practically given over the
internet.

I'd begin by checking power supply components and solder connections.
Especially any solder connections involving a regulator transistor.

Mark Z.