trouble with Denon POA 2800 amp - Anatech rsvp

[stressbeater]

I have owned this amp new since 1998 and have enjoyed it's powerful
sound delivery, through my B&W P6, w/o fault until 10/2006.
Back in Oct/2006 my right channel failed.
I dropped same off to Denon Repair in Markham and, now after three
subsequent repair attempts, I am still confronted w/ no sound from Right Channel.
Following first repair - sound kicked in, until I shut system off and tried to restart
the following day - NO RIGHT CHANNEL
Same thing occurred following 2nd repair attempt, and finally on third repair
attempt - NO RIGHT CHANNEL at all.
Completed neophyte testing - alternating speaker wires, followed by
alternating output chords from pre-amp, to support fault is related to RC
of power amp.
Any ideas - I believe I read somewhere that a breach in solder connection
can show up once system heats up ( expansion occurs ) ?
Please help as my IPOD player is no match for my wonderful Denon/B&W system.

THANK YOU

[K-amps]

Assuming they repaired the op stage.... I am tempted to think that the shop (unknowingly) used fake OP devices.... lots of fake sankens out there.

Another thing could be your relay is not kicking in, probably due to bad lytics.

Id you know what they repaired the first time, Anatech would have something to go on...

[stressbeater]

K-AMPS THANK YOU for your prompt response !
As requested:
1st repair - adjusted bias current
2nd repair - extensive testing - N.F.F. ( no fault found ? bench test unit );
secured all input connectors
3rd repair - no notes on repair slip o/t tested OK

[K-amps]

When you trun on the amp, do you heart a "click" after 2-3 seconds?

Is it running fine now? Is the issue intermittent?

Not sure what the problem is... please define the issue.... Looks like the repair shjop did'nt repair anything because there was nothing to be repaired, if so, whats the prolem?

[anatech]

Hi stressbeater,
I know the guys at Denon. The best technician is Peter. He is Austrian.

It sounds like you have an intermittent fault there. If you want, I can have a look at it for you. I'm over in Georgetown, I don't know whether that is close to you or not. What your service history shows is that the fault may not have occured on the bench.

Please don't go wandering around with a soldering iron. You will erase any clues that may be there, making it harder to fix.

-Chris

[stressbeater]

K-Amps
1) no clicking sound after 2-3 seconds o/t standard delay associated with muting circuit
2) Amp is inoperative - no sound from right side ( channel )
3) Problem is not intermittent. When first noticed, back in Oct/06, their simply
was no sound from right channel. To ensure problem was power amp related I completed
neophyte testing by switching speaker cable to ensure same was not speaker or cable related. Also alternated output chords to ensure pre-amp was working properely.
Everything pointed to POA2800 right side ( channel ) problem.
4) Amp is back at Denon for the 4th time - fingers crossed.

[stressbeater]

ANATECH - THANK YOU for your response !
Amp is currently back at Denon for the 4th time,
If they are unable to correct problem, I would like to drop same off in Georgetown
for your personal assessment.
Please supply address and /or contact information for shop.

p.s. I would NEVER consider wandering with a soldering iron ( LOL )

[K-amps]

Either you have DC at the outputs or the relay circuit needs fixing is my guess.

[anatech]

Hi stressbeater,
Okay, that's good. They might use a real tech on it now. At least a constant problem is traceable.

If you need to bring it to me (I hope not - I'd rather see Denon catch it to save you running around), PM me with the mail button. Just post if you can't and I'll send you mail.

Arif,
Yup!

-Chris

[Geopoliticus]

Whatever happened with your amplifier? I really want to know as I have a Denon POA 2800 which is faulty too. It started with the left channel and now both channels are damaged. Sound is still coming out of both channels but it just doesn't sound right at all. Sounds like a lose connection and kinda "scratchy". Sound is also distorted and at low volume no matter how far I turn the vol. knob on the PRA 1500 (pre-amp). This unit was bought from new in 1994-1995 and this is the first time I'm experiencing errors with this amplifier.