I have denon avr 2802 I bought on ebay about 2 months ago. It worked when i tried it out with a mixture of speakers connected direct for surround and centre and pre outs into active SW and front pair. I came back to it yesterday and connected up all direct speakers- no pre outs apart form the SW and could not get any sound. As before i have plugged my ipod via 3.5mm to RCA into 'CD' (also tried others) I have since tried just with headphones (and ipod). Have reset microprocessor a few times. Any ideas. R XXXXXX
Can you hear any sound when the speakers are disconnected and only headphones are connected?
No sound with spkrs disconnected and only headphones connected
Ok, then that rules out a speaker wiring fault.
The problem is internal within the Denon, most likely in the audio processing part of the circuitry.
Do you know approximately how old it is?
It's pre HDMI connectionjs. about 9 years. Howvere as I said it did work when I first tried it about 2 months ago and it was when I came back to it yesterday that I couldnt get it to work..
On older units, they usually suffer from gradual intermittent failure first, before it becomes more permanent.
So the unit may have been starting to show signs of a problem before it was sold on.
You can try resetting the microprocessor 4 or 5 times in a row - it might get it working for a short while.
However to get it working long term, it will need some detailed diagnostic testing at a Denon lab.
If you have some experience in electronic repairs, you could have a look inside for any obvious signs of burned capacitors, bad solder joints, or swollen capacitors.
If the fault is not visually obvious then thorough testing will be the only way to get to the bottom of it.
I don't buy that. It worked fine two months ago. Been safely stored since . I have also reset the micoprocessor several times (4 or 5 times). Gradual I might accept but fine--to-nothing I can't. Output transistors don't go when switched off for 2 months. I wondered if the ipod connected to Cd was the right socket and if not could that have causd damage?
Connecting the iPod to the wrong input socket would not cause any damage.
Are you able to check inside for any faulty components, or attach a photo here of the inside so I may check?
One other thing - when you connect the headphones, does the display change to show the action?
And when the headphones are disconnected, does the screen change again?
I had a look yesterday after trying it for an hour unuccessfully.No melted capacitors or cracked or melted pcbs.etc. I wondered how to test the the output transformer but of course that is not used for headphones. I'll have another look but to take a useful photograph requires taking to bits to expose the underside of the pcbs
Just going back to the microprocessor again, how many times was it reset?
Sometimes it takes 4 or 5 resets in quick succession to reset it fully.
Can you try that and let me know if there is any improvement?
A lot of the audio processing is done within the microprocessor, so it is usually the most common cause of this phenomenon.
- also check for dry or cracked solder joints around the microprocessor if you have the unit opened.
Ok I will try that.
Let me know how you get on.
I have to go into town shortly, but I will pick up your replies here by email and reply back again as soon as I can.
Also I don't have a remote and wondered if somehow a mute setting had happened which you can do on remote but no sign of a button on the machine. But I suppose resetting would obviate that
Yes, a power cycle will reset the MUTING function.
Ok, chat later...
I cant get to underside of pcbs without a lot of dismantling but looking through gaps at bottom it looks fine. No obvious signs of anything inside . The machine detects my input ok . i.e plug inti cd and it says 'in cd' and into phono it says 'in phono'. Rest m/p at least 5 times in quick succession.. One thing though - in the manual it says 'switch off' machne and unplug and then plug in holding A and B down. Nothing happens. Its only when I unplug, switch standby/on switch on and then plug in holding A and B - then it all lights up and flashes as its meant to.
had an email to rate your service but we are not finished yet? Barely started.
so what now? I really don't want to spend 2 hours dismantling it to look at pcb. If you want to end it I would like at least a good steer as to the problem or wher to look. As far as i can see on the stand up boards they look clean. all internal connectors are plugged in. Am I looking at replacing output transistors? How can I understand how it worked 2 months ago and not now?
Please see above which answers your questions. specifically all the electrolytics are visually fine.
It sounds like end of line then. I don't want to appear mean and grudging but not really convinced this is worth £26 of my money. I didn't expect you to repair it over the internet but having some knowledge of electronics and having built a few things in my time I don't think you have told me very much beyond what I have told you. I don't think electolytics just stop working from one time working to next time dead. I don't want to rate poor but Ok means I pay full amount? Am I being unfair?
oh ok. I'll rate ok and pay. If I find time later to strip it down and take some pics to send , will you look at them.? It would be useful to have a direct email address as you already have for me (?) but if not it's *****@******.***