Assistance needed with a Denon PMA-2000ivr

[PhillipBrown]

Hello to all.
I found a Denon PMA-2000IVR in my travels and could not resist lugging this 58 lb. beastie home to see if it worked. I plugged it in, turned it on and it went into standby and then shut itself down. So I opened it up to see what I could do and I noticed it had a ribbon cable inside that was unplugged and a blown 10amp fuse. I fixed these issues and now it powers up. Yeah!!!
I set it up according to the online manual but no music could I hear. I should tell you all that I don't have the remote and perhaps that is what is at issue here. My other Denon is an AVR-2400 and it has been limping along after a lightning strike and will only work with the remote so perhaps this is a similar problem.
In any case I would be grateful for any ideas and direction because if the truth be known this amp wants to work (Just a feeling) and I think it is a beautiful piece of craftsmanship.

Thanks

Phill

[sk1939]

Hello to all.
I found a Denon PMA-2000IVR in my travels and could not resist lugging this 58 lb. beastie home to see if it worked. I plugged it in, turned it on and it went into standby and then shut itself down. So I opened it up to see what I could do and I noticed it had a ribbon cable inside that was unplugged and a blown 10amp fuse. I fixed these issues and now it powers up. Yeah!!!
I set it up according to the online manual but no music could I hear. I should tell you all that I don't have the remote and perhaps that is what is at issue here. My other Denon is an AVR-2400 and it has been limping along after a lightning strike and will only work with the remote so perhaps this is a similar problem.
In any case I would be grateful for any ideas and direction because if the truth be known this amp wants to work (Just a feeling) and I think it is a beautiful piece of craftsmanship.

Thanks

Phill

It sounds like something either shorted/got fried/blew inside. At worst case, it could be the output/amp stage. The obvious question is, do your source, cables, and speakers all work?

[PhillipBrown]

[QUOTE=sk1939;1239528]It sounds like something either shorted/got fried/blew inside. At worst case, it could be the output/amp stage. The obvious question is, do your source, cables, and speakers all work?[/QUOTE

All cables are good. the speakers I'm using here in my studio are functioning and I've used two different sources so that is fine as well.

Would a short of this kind be visible ? I ask because I would like to know what Im getting into $$$ wise before turning it over to a pro.

thanks again

[sk1939]

[QUOTE=PhillipBrown;1239539]

It sounds like something either shorted/got fried/blew inside. At worst case, it could be the output/amp stage. The obvious question is, do your source, cables, and speakers all work?[/QUOTE

All cables are good. the speakers I'm using here in my studio are functioning and I've used two different sources so that is fine as well.

Would a short of this kind be visible ? I ask because I would like to know what Im getting into $$$ wise before turning it over to a pro.

thanks again

Hmm, look the amp over for burn marks, scorch marks, etc.

First off though, turn it on, you should hear a click of some kind, if not theres your problem. The click means the protection relay is open preventing power from getting through. That means there is a short somewhere.

[PhillipBrown]

When you power it up there is a noticable click and the power standby light blinks for a moment and the then stays full on. The input selector relay clicks nicely as you turn it so that appears ok as well.
I've seen nothing that looks burned but a more though inspection is called for. Tomorrow it seems.
Thx

[PhillipBrown]

Hello

So I've taken it apart and have discovered that some has been there before me. Perhaps a repair job left in mid-stream.
There are two transistors that are attached to the heat-sink and should be soldered to the Right Channel circuit-board. The transistors have been un-soldered and the board put back. This is also was the board that I had reattached a ribbon cable to so that minor mystery has been solved.
So I wonder what I have here?
More to the point as I would love to have this amp running I am reaching out to you folks for advise before I do what to me would be the natural thing and resolder the transistors back, plug the amp in and hope for the best.

Thanks again

Phill

[Conradicles]

Silly question but do you have the jumpers for the "pre-out/main-in" installed on the back of the unit?

Nice amp Phill and welcome to Club Polk.

[PhillipBrown]

Yes this amp has pre-outs as well as power amp outputs. The pre-outs are always on and the PowerAmp is switched.
I literaly found it at my local transfer station!
When I powered it up the protective circut wasn't happy and shut the unit down.
So I took a look inside and noticed a blown fuse and a ribbon cable the was disconnected. One new fuse later and the amp would stay on but no sound.
So I disassembled the unit to see if there were and obvious problems and I discovered that the right channel output transistors were unsoldered so a repair had been attempted and left unfinished. I reconnected the transistors and the unit but they are clearly defective.
So that is were it stands right now.
I'm considering completing the output transistor repair as soon as I am able.
I'll update as soon as I have news.
til then

Phill