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Denon PMA-2000-R not engaging speaker relays

jerdobi

jerdobi

New Member
This is an interesting sometimes works, sometimes won't.

When the amplifier is on the bench it works fantastic. I button it up and play it in my rack with no issues. 24 hours later, power on and hear the power relay kick in, red led blinking for a few seconds and then goes full red; but BOTH power relays are disengaged. I've tried a bit of bumping
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and no response. (repeat this paragraph 2-3 times
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).

Take it back to the bench and see same issue.
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Decide to look at the protection board behind the bottom cover.

I turn the amplifier upside down remove the bottom to look at the protection board. It looks good with no noticeable issues, all capacitors are high quality caps with no bulges. Well, turn it on while upside down and low a behold it starts working.
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Put back the bottom, flip back right side up and still working.

My diagnosis is there's a loose connection, but can't see it as this thing is solid with literally no loose wires, just connectors. Whatever the issue, it shuts down both channels and I don't think it's a relay.

Anyone seen this symptom on a PMA-2000R or PMA-2000IVR? Maybe they work better upside down?

Thanks!
 
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If you know how to solder, you might want to go through it and do some touching up. A symptom such as you have described certainly sounds like it could be a cold solder joint. I know it might seem like a pain but sometimes its got to be done.
 
Yep, I was thinking a good time to remove the amplifier boards and do some re-soldering especially to the connector sockets and replace the speaker relays.
 
I removed the protection board and touched up the solder joints on all of the 8 connectors. Seems to be holding with no issues yet. I'll let it cool down on the bench in the cellar for a night and see what it's like in the morning. I'm already ready to re-cap this board as it has some no-name capacitors on it just for good measure. We'll see.
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Latest update. I powered on the amplifier today after leaving the amplifier on the bench to cool down overnight. The relays engaged! So, might have fixed the issue by touching up solder joints on these 8 connectors. They have some large ribbon cables attached and a hard jolt might have flexed these connectors causing a cracked solder joint. I looked closely at each joint and didn't see anything, but seems I may have fixed the issue.
 
Did you
jerdobi said:
Latest update. I powered on the amplifier today after leaving the amplifier on the bench to cool down overnight. The relays engaged! So, might have fixed the issue by touching up solder joints on these 8 connectors. They have some large ribbon cables attached and a hard jolt might have flexed these connectors causing a cracked solder joint. I looked closely at each joint and didn't see anything, but seems I may have fixed the issue.
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Did you ever recap it ? I just got one.
 
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