CurtPalme.com Home Theater Forum

[Jeremy112]

Kind of an odd issue I have here with this receiver. I don't think its anything serious because all the channels do output sound fine, and everything sounds fine.

The issue is this, when switching the sound mode (from say stereo to 5 channel stereo) a relay clicks, and then the sound either makes a static sound like "SHHH, SHHH, SHHH, SHHH, and so on" or it wont output any sound at all.

Now to get it to output sound again, I have to switch it back to direct or stereo, another relay clicks, sometimes it sounds like 2 relays.

So what could cause this? Bad capacitors, corroded contacts on the relays? The receiver has not been physically abused, and I have not yet taken it apart, I wanted to get some theories before I start investigating.

[macgyver655]

When you select 5 channel output and there is no sound, is it no sound on just the R and L front or no sound for all channels?

[Jeremy112]

[macgyver655]

Try the preamp outs and see if you get the same or not.

[Jeremy112]

Mac,

Sorry it took so long to get back to you, got some more time to work on the denon, and I hooked another amp up to the 981s pre outs and it still does the same thing.

I should note, it seems that the receiver is worse when it is first turned on. No audio will output at all. If I let it warm up for about 30 minutes or so I can mess with the sound modes and turning it on and off again to get it to output in stereo again, but thats as far as I get.

[macgyver655]

Ok, next I need you to try the 6 ch input. You can just input to the FL and FR for testing. For output you can test both ways, preamp outs and speaker outs.

[macgyver655]

In case any one else wants to follow along or add any input, this is what I'm currently looking at to determine where to start hunting for the culprit part.

[Jeremy112]

Mac,

Sorry I didn't get back to the Denon and you yesterday, I was recieving more McIntosh equipment and I had to make some more room around here (which is getting increasingly hard to do )

Anyway, I will try the 6 channel input and see what happens & report back to you.

For the record, this is a nice sounding little unit, especially for $5!

[Jeremy112]

Ok, sorry it took a bit to get back to you mac, but I had a chance to test it out with 6 channel input, from cold power on (after being off for a while) using 6 channel input, no sound is produced at all.

I will have more time today to work on it, hopefully we can get something figured out

[Jeremy112]

Mac, just thought I would update ya, maybe this will help. I left the receiver on last night after trying the 6 channel input without success.

This morning I turned it off, and then immediately pressed the power button again to turn it back on, after the relays clicked on, sound was produced with the 6 channel input.

Seems like it needs to be warm or on for a while before it even operates close to what it should... Thought this might help in diagnosing

[macgyver655]

I'm not sure yet. I need you to do this testing again from cold. It's super important to know if the 6ch input works properly or not. If we don't get this right we could end up searching for a problem in the completely wrong location. Make sure you have the input properly selected.

Also you didn't say if, when it was working if you were testing with the internal amp or the preamp outs. I need all information.

[Jeremy112]

You're right, I completely forgot to mention the separate amp test... Damn

I did test it with a separate amp using the front L & R pre outs as well as the surround pre outs, they did not produce any sound output from cold power on

The same is true for the 6 channel input from cold power on, as well as any other type of input. It will NOT work right away, it HAS to be on for at least 20-30 minutes for it to even work in stereo mode.

Also, after it does warm up and half way work, the other surround sound modes do Not work, either no sound is produced in any other mode other that DIRECT or STEREO, or you get 1 second SHH type static bursts through the speakers.

it does not seem to matter what input I use, but I can only output in stereo or direct, AFTER it has warmed up for at least 20-30 minutes, prior to that, no audio will be produced at all.

Hopefully that clears it up a bit

[macgyver655]

Ok, if your confirming that the 6 ch input also does not work cold then that narrows it down. Let me look over the schematics and get back to you.

When it is working does the volume control work correctly (sounds goes up and down)?

[Jeremy112]

[macgyver655]

The problem appears to be originating on the EXT Unit Assy board (1U-3233), I'm thinking audio input board.

But we need to make sure it is being powered correctly, especially cold. So you need to find connector CW052 on this board and connect some wires to it for testing. Pin 1 is +12v, pin 2 is -12v and pin 4 is ground. Fire it up cold and see if you have these voltages.

[Jeremy112]

Well its been 6 months mac, sorry for that huge gap there... :-\

If you're still willing to assist, the voltages you told me to check on CW052 read perfectly, +12.26v pin 1, -12.28v pin 2. So it's getting the power it should be getting.

[Jeremy112]

FWIW mac, this is exactly how the receiver behaves everytime as it is: Cold power on, no sound heard on any input selected. So I power it off, unplug it, hold speaker A + B buttons and plug it back in to do a factory reset, and then when it powers up and the audio relay clicks, I can hear sound on the tuner, and turn volume up and down. It sounds muted, because I have to turn it up to 0db just to hear it at normal levels, and at that level it sounds distorted a bit since its almost at full output.

If I switch the surround mode, or input then the audio will cut out, and I will have to do a factory reset again to get the audio to play.

I can only verify that the tuner input works, because that's what it resets to during the factory reset. I have no idea if any of this will help or not, but I think it clarifies how it behaves during what should be "normal" operation.

[macgyver655]

Ok, catch me up and I'll see if I can give you some time. It's nice weather now so I have less time here.

It acts the same whether you use any input, even pre amp in? Acts the same whether using speaker output or preamp output? And it does the same on all channels?

[Jeremy112]

Correct Mac, Unfortunately the only time I can actually hear anything is when I do the factory reset which puts all the settings right back to default and only allows me to use the tuner, if I switch it to CD or something, then sound cuts out, as it does if I switch surround modes etc... basically if I touch a button besides tuner and volume right after a factory reset it will cut out.

I haven't been able to test the center or rear channels because of this issue just so you know.

[macgyver655]