"Dave Plowman (News)" wrote in message
...
I've been given this rather large and heavy AV amp dating from the last
century which is faulty. It will yield a pretty decent mains transformer
even if I scrap the rest.

Basically it started making funny noises from one of the rear channel amps
- and after a few weeks now powers down a couple of seconds after being
switched on. My guess is the speaker DC protection cutting in due to a
faulty output on that amp.

Is it worth attempting a repair?

**Probably not. If you want to persevere though. your best move is to obtain
a service manual, so you can interpret the fault codes. The service manual
will also provide the procedure to over-ride the protection system, so you
can fault find. The protection system in those critters is a very
sophisticated arrangement. It will shut the amp down in response to a whole
host of different things, including (but not limited to):

* DC offset.
* Over current in output stage.
* Regulater power supply faults.
* DSP faults.
* Microprocessor fauts.


--
Trevor Wilson
www.rageaudio.com.au