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Old 24th October 2014, 04:23 PM   #1
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Default Service Manual Needed

Tried to look up online and I just can't!!! find a service manual for a Denon AVR-2801. The fault is, it does not power up at all, so I did some exploring and found 3 of the power caps, the small cube shaped one's had gone bad, they do have the value on them, but I need to be sure of the exact value....
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Last edited by XsamuraiX; 24th October 2014 at 04:31 PM.
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Old 24th October 2014, 04:38 PM   #2
Apogee is offline Apogee  United States
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Greetings XsamuraiX,

The items shown in your image are bridge rectifiers unless you're referring to the small caps next to them. Nothing fancy. Either way, are you sure you're testing them properly? Based on their proximity to the bridge rectifiers, you are likely seeing continuity through the rectifier diodes. Try reversing your leads if you are measuring in circuit to see if their readings change. You really need to pull the caps and test on an ESR meter to determine if they're bad or not. Also, if those caps are shorted, then I'd make sure to test the bridge rectifiers as they will likely have taken a hit as well.

Go to the hifiengine website for your manual. I was going to send it to you but it's too big. Easier for you to just join the site and get it yourself as they have it available. It's free so no worries about it costing anything.

HiFi Engine - Owners and Service Manuals

Good luck with your project!

Kind regards,

Steve
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Last edited by Apogee; 24th October 2014 at 04:45 PM.
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Old 16th November 2014, 11:07 PM   #3
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Hi, I tried to find that service manual on that website you said about, but it seems like my model is not there
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Old 16th November 2014, 11:34 PM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by XsamuraiX View Post
Tried to look up online and I just can't!!! find a service manual for a Denon AVR-2801. The fault is, it does not power up at all, so I did some exploring and found 3 of the power caps, the small cube shaped one's had gone bad, they do have the value on them, but I need to be sure of the exact value....
You'll just need to log in, it's free.

Denon AVR-2801 Manual - Audio Video Surround Receiver - HiFi Engine
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Old 22nd November 2014, 09:47 PM   #5
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Thanks a lot rayma, downloaded and now in test mode
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Old 22nd November 2014, 09:53 PM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by XsamuraiX View Post
Thanks a lot rayma, downloaded and now in test mode
Good luck, let us know what happens. Look for open fuses. Electrolytic problems are common, too.
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Old 23rd November 2014, 03:10 AM   #7
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Yes, going to check other caps, the only 2 caps I have tested are the main, large power caps, they both have 10000uf on the plastic, but my cap meter only reads up to 2000uf need to buy a new one, then, to test the smaller, block shaped orange caps there in the picture also, all the fuses are fine, I tested all of them out and all ok.. I'll check those smaller orange caps 1st though as I've been watching video after video after video on Youtube with amps with no power at all, mainly it's always either bad caps, those orange caps or blown transistors. Only problem is, on my Denon, to get access to those transistors I have to remove every circuit board that is attached to the base board pain in the butt!
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Old 23rd November 2014, 04:04 AM   #8
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The film caps are unlikely to be faulty.
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Old 23rd November 2014, 12:30 PM   #9
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Hi KnD, just abiout to test them, I do hope not, I just tested the large electro caps and they seem to be ok, reading around 9989 each...
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Old 24th November 2014, 11:20 AM   #10
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Update. Tested out of circuit.

Main cap pair, 10000uf 63v reading as 9945 at best

Film caps, 0.1uf reading as 140

Smaller cap, 1000uf reading as 983


But, for some reason, they will not!!! hold a charge/charge up.
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