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Old 11th June 2014, 01:49 AM   #1
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Default Denon 3313 problems

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
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Old 11th June 2014, 04:20 PM   #2
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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.
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Old 11th June 2014, 05:43 PM   #3
rif is offline rif  United States
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Try checking the speaker wires for shorts. Just unplug them all and see what happens.

Also check out

batpigworld | the "Denon-to-English" dictionary…. your one-stop shop for Denon help

It's mostly setup info, but if this is a common problem, it may be there. You can also reach out to the person who runs the site. He helped me with an older model.
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Old 11th June 2014, 11:15 PM   #4
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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
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Old 11th June 2014, 11:23 PM   #5
rif is offline rif  United States
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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.
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Old 11th June 2014, 11:44 PM   #6
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Darn phone! Double posted!

Last edited by nightrider0614; 11th June 2014 at 11:46 PM.
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Old 12th June 2014, 12:45 AM   #7
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Sgrossklass,
What problematic caps in the yammy's are you talking about? the green ones? If so I think denon got smart and discontinued those.


Thanks for your help

Jeff
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Old 21st June 2014, 06:19 PM   #8
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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
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Old 21st June 2014, 07:20 PM   #9
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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
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Old 21st June 2014, 08:32 PM   #10
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I snapped a few pics, the arc welding was an accident while testing but the parts are still fine.
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