Denon 3313 problems

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nightrider0614

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Joined 2012
#1
Hi,
I got this thing off of a friend because it wouldnt power on. Not in protection mode, but no light or relay click at all..

The weird thing is that I first did a reset by plugging it in while holding the info and back button and the display started flashing and the unit reset.

I then took it to my internet and was able to do the updates. I turned it on and off a few times then unplugged it and took the unit back to my bench to test everything else.

Guess what? nothing. no lights, clicks nothing. I don't think that I even jostled this thing as I only carried it about 20 feet or so.

Checked all of the fuses and they appear ok.

I don't see power going to the main relay but there is power coming in. Is this common for this unit? I have been searching the internet but am having a hard time finding anything repair wise about this unit. I am trying to pull voltages but need a bit of a starting point!

Thanks for your time,
Jeff
 
#2
Sounds like a standby power supply issue, possibly similar to what you find on a number of Yamaha units. Be warned that these things tend to be run directly from mains and an isolation transformer is highly recommended when attempting to measure anything when powered. I'd look for voltage dropper caps like the problematic ones in Yamahas first - with no power applied.
 
#4
Thanks for the replys, it's not in protect mode, acts the same with or without speakers connected.

I am thinking its he standby circuit from what I can see. There is a .1 uf cap I want to check. I thought that denon fixed the c5 cap issue with a better cap but it appears to be in the same position (but c7 I think)

Thanks again for all the help!

Jeff
 
#5
Sounds like you're way ahead of advice I can offer. But maybe try something simple - if you have one hook up a kill-a-watt to it and see if it's drawing any power and how it changes when you start pressing buttons.
 
#8
Had to take a break on this unit because of work. I checked the .1 cap that I thought may be the issue and it is reading 88.xx nf which is within tolerance

I have been trying to check voltages and it seems thast I am not getting AC voltage to the on board transformer that supplies the stand by power and the power on relay.

I checked the diodes at the bridge and I am seeming to have power there.

Any help at this point greatly appreciated!

Thanks,
Jeff
 
#9
Been checking some more things, all of the diodes on the primary side of the power supply appear to be good.

I don't think that its the secondary transformer as I have ohms on it when I check it.

There does not seem to be any power anywhere in the unit until the main relay fires.

I have been thinking about just jumping it but I dont think that will solve the issue. It has to be there for something.

Thanks for your time,
Jeff
 
#10
I snapped a few pics, the arc welding was an accident while testing but the parts are still fine.
 

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#12
I know this is cheating but you could give panurgy (spelling?) a call and see if they can give any hints-play dumb and lead them on. They're the company that does warranty repairs. I had to send one of my units to them and after doing the same, they told me exactly what the problem was before I sent the unit in.

Since it's a "ci" model, it should have a 3 year warranty, buy that's really cheating 😉
 
#13
Yea, I know
My buddy bought it off of the Bay unauthorized seller and Denon wouldn't approve a fix. No receipt, unauth seller, that is how I got it. Probably was a display unit or return that was 'refurbished'

I figure that the power supplies have to be similar between the 33xx series and maybe someone else would have seen this same issue.

There is also a Denon tech that hangs around but I have not heard from him yet.

Not sure if I want to call Pan... yet, I'm not sure that they would want me asking what voltages should be were on the ps board. That kind of throws the whole playing stupid thing right out the window.



Thanks,
Jeff
 
#14
Ok,
I found a schematic on line and here is the smps. I replaced c901 and it powered up once. then nothing. I seem to be missing the digital supply power at CN903.

I seem to have power across where C9004 would be but there is nothing across the top258 (IC901) pins 5 and 6 where I would expect like 58 volts or so?

Am I on the right track with this? Any thoughts or comments would be appreciated!

Thanks,
Jeff
 

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#15
I would still try calling Panurgy. Tell them whats happening with lights, buttons, power (NOT the detailed voltage stuff). Try to lead them on to get them to say "It's probably the relay unit, we see that a lot" or "It's the PS module caps"). You get the idea. I got them to "admit" that it was a HDMI board issue on mine and the only solution was to replace it with an upgraded one -- denon knew about the problem but kept quiet.
 
#16
sgrossklass said:
Sounds like a standby power supply issue, possibly similar to what you find on a number of Yamaha units. Be warned that these things tend to be run directly from mains and an isolation transformer is highly recommended when attempting to measure anything when powered. I'd look for voltage dropper caps like the problematic ones in Yamahas first - with no power applied.
Click to expand...


I think this guy is right.
 
#18
All I know is something on that board has failed. On the yamahas it is a cap failure. So if you have a cap tester, test every cap on the board. The only thing you have to lose at this point is the time doing it. Are you thinking the ic is bad or something?
 
#20
Thanks for all of the reply's so far, I think that I am getting somewhere. The .01uf 250v caps in the switcher are at 8 nf (.008 uf)

I am continuing to check these chiclet caps, but I am wondering if this is causing the SWM to go into auto-protect and that is why I don't have a standby power.
 
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