In article ,
Jim Lesurf wrote:
In article , Trevor Wilson
wrote:


**Probably not. If you want to persevere though. your best move is to
obtain a service manual, so you can interpret the fault codes.

Jings. Sounds like trying to repair such beasts is similar to trying to
sort out modern TVs with their fancy 'menu' systems.

I've had a glance at the handbook that came with it and microprocessor
control does have its advantages. Like being able to trim the gain on each
and every input.

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.

That tends to feed my predjudice that the protection circuitry tends to
bring with it a set of additional 'failure modes' and sources of
problems.
:-)

Indeed. I'm hoping it isn't so clever it won't power up unless it sees
exactly the right load.
I've spoken to the ex-owner who says the noise from one rear speaker was
a loud but intermittent crackle. My hope is it's a (simple) amp fault
causing the DC speaker protection to trip. Anything else and it's likely
scrap.

Doing a 'Google' on it seems it was a well respected amp in its day.

Slainte,

Jim

--
*It sounds like English, but I can't understand a word you're saying.

Dave Plowman London SW
To e-mail, change noise into sound.