I have a Denon AVR x3000 that’s doing a few weird things. I know my way around loudspeakers but not so much amps.
1. It’s running HOT.
2. The speakers pop when it turns on or off. But I also hear a relay click...
3. There have been times where if I touch the chassis it will shut off, I think it goes into protection mode because the power led blinks.
4. It’s got a wee little bit of a hum to it.
I assumed something was shorting to the case but I looked around and didn’t see anything. It does use the case to heat sink some transistors at the bottom though. It’s also completely possible I missed whatever it is.
Any help would be appreciated.
Brad
1. It’s running HOT.
2. The speakers pop when it turns on or off. But I also hear a relay click...
3. There have been times where if I touch the chassis it will shut off, I think it goes into protection mode because the power led blinks.
4. It’s got a wee little bit of a hum to it.
I assumed something was shorting to the case but I looked around and didn’t see anything. It does use the case to heat sink some transistors at the bottom though. It’s also completely possible I missed whatever it is.
Any help would be appreciated.
Brad
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Have you tried a microprocessor reset?
The 'Official' 2013 Denon "E Series" / "X Series" AVR Model Owner's Thread & FAQ - AVS Forum | Home Theater Discussions And Reviews
The 'Official' 2013 Denon "E Series" / "X Series" AVR Model Owner's Thread & FAQ - AVS Forum | Home Theater Discussions And Reviews
The running hot and touch sensitivity points to instability/oscillations. Are the grounds well connected? How about the connections to the rest of the chain? Any chance of open inputs?
Jan
I did do a reset on it, unfortunately that didn’t solve the problem.
I could only see one ground and it looks secure. I’ll look for more. I’m not sure what you mean by the rest of the chain and open inputs.. I have one HDMI and one RCA attached to it. They both seem to be okay. They were attached to the reciever that came right before it without problems. I noticed when I plugge le the RCA in though I got ‘live sounds’ as if I were touching the other end of a hot cable. But it’s just the audio out of my tv and the tv wasn’t even plugged in to power at the time.
It was also popping on start up before I plugged any inputs in. Had speakers only.
I could only see one ground and it looks secure. I’ll look for more. I’m not sure what you mean by the rest of the chain and open inputs.. I have one HDMI and one RCA attached to it. They both seem to be okay. They were attached to the reciever that came right before it without problems. I noticed when I plugge le the RCA in though I got ‘live sounds’ as if I were touching the other end of a hot cable. But it’s just the audio out of my tv and the tv wasn’t even plugged in to power at the time.
It was also popping on start up before I plugged any inputs in. Had speakers only.
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Little update: With the chassis case off (top and sides slide off as one) it doesn't pop on start up / shut down. I looked around but can't see anything that touches to top or sides...
I should add that I only saw one ground strap cable, but looking under the unit I saw many more grounds. They were all tight.
And one other thing, I have the case off and music playing to see how hot it gets. It seems to be running much cooler but I'm going to give it more time. One thing I accidentally noticed is that as I put my hand up to the heatsink fins I discharged a static shock. The speakers then make a very quiet little static shock kind of sound. Should that shock have made it's way from the heatsink to the speakers? (I realize I shouldn't be discharging static to any electronic devices)
I should add that I only saw one ground strap cable, but looking under the unit I saw many more grounds. They were all tight.
And one other thing, I have the case off and music playing to see how hot it gets. It seems to be running much cooler but I'm going to give it more time. One thing I accidentally noticed is that as I put my hand up to the heatsink fins I discharged a static shock. The speakers then make a very quiet little static shock kind of sound. Should that shock have made it's way from the heatsink to the speakers? (I realize I shouldn't be discharging static to any electronic devices)
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Ground is propagated through all cabling through your whole chain. You could check if anything changes if you disconnect any equipment downstream or upstream. That could provide a clue.
Jan
Jan
This generation of Denon AVR has always been dodgy when it comes to grounding as far as I'm aware. A ground loop over the HDMI cable can also make the HDMI hiccup, pointing towards shield currents influencing differential transmission, which clearly is not something that should be happening and would be pointing towards shared ground issues.
Now mass-market devices like this are rarely developed by bumbling idiots, so while I have always been curious about what might be causing these issues, I'm not sure whether we will be able to identify and correct them.
What we should be seeing is HDMI shield and Ethernet shield being connected to chassis and returned to central star ground this way.
I headed to HFE to see whether they had a service manual for this guy, and lo and behold, there it is. All 70 MB of it. After a quick look:
1. HDMI ports appear to be screwed to chassis. Verify continuity between them and chassis ground.
2. The digital video board uses reasonably extensive ground fills (loops included, but both layers stitched) but looks to be pushing the limits of 2 layers. Two additional power and ground planes wouldn't have hurt.
3. The analog video board is another 2-layer board, and littered with jumpers everywhere. WTF? I expect to be seeing jumpers on a single-layer affair but not a double-sided board. Was that layout done by the intern or what?
4. As a further complication, the standby power supply is a SMPS. 2n2 Y capacitor + 2x 470 pF line filter caps.
5. HDMI internal differential pair shields connect to +5V via 6k1 || 1µ/10V. Is something like this standard practice?
The heating may or may not be normal. Every power amplifier has a pin header that serves as a bias test point (CN715, 725, 735 etc.). The service instructions call for 8 mV across the outer pins 10 minutes after power on, adjusted via VR714 etc. (p.81).
Now mass-market devices like this are rarely developed by bumbling idiots, so while I have always been curious about what might be causing these issues, I'm not sure whether we will be able to identify and correct them.
What we should be seeing is HDMI shield and Ethernet shield being connected to chassis and returned to central star ground this way.
I headed to HFE to see whether they had a service manual for this guy, and lo and behold, there it is. All 70 MB of it. After a quick look:
1. HDMI ports appear to be screwed to chassis. Verify continuity between them and chassis ground.
2. The digital video board uses reasonably extensive ground fills (loops included, but both layers stitched) but looks to be pushing the limits of 2 layers. Two additional power and ground planes wouldn't have hurt.
3. The analog video board is another 2-layer board, and littered with jumpers everywhere. WTF? I expect to be seeing jumpers on a single-layer affair but not a double-sided board. Was that layout done by the intern or what?
4. As a further complication, the standby power supply is a SMPS. 2n2 Y capacitor + 2x 470 pF line filter caps.
5. HDMI internal differential pair shields connect to +5V via 6k1 || 1µ/10V. Is something like this standard practice?
The heating may or may not be normal. Every power amplifier has a pin header that serves as a bias test point (CN715, 725, 735 etc.). The service instructions call for 8 mV across the outer pins 10 minutes after power on, adjusted via VR714 etc. (p.81).