Onkyo TX-DS939 problem... - diyAudio
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Old 4th September 2006, 03:49 PM   #1
Jexx is offline Jexx  United States
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Default Onkyo TX-DS939 problem...

Okay, so I did something pretty stupid.

I hooked up a JL w7 subwoofer (3 ohms) to my Onkyo TX-DS939 receiver (8 ohm minimum) to see if the sub worked. It was for a brief amount of time (not more than a couple of minutes).

Now there is a buzzing sound in all channels that goes away once the unit has warmed up. I opened it up and found some smaller caps that are buldging slightly...could that be the problem?

I've repaired car amps before, but never anything like this...

General pic of board:
http://img.photobucket.com/albums/v3...1/DSCN2659.jpg

Caps in question:
http://img.photobucket.com/albums/v3...1/DSCN2658.jpg
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Old 4th September 2006, 04:19 PM   #2
Netlist is offline Netlist  Belgium
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These caps are definitely bad. Replace and see.

/Hugo
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Old 4th September 2006, 04:40 PM   #3
Jexx is offline Jexx  United States
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Okay, desoldered them.

One is 4700uF @25V

The other is 1000uF @35V

Where can I get replacements?
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Old 4th September 2006, 04:44 PM   #4
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www.digikey.com

www.mouser.com

Maybe even Rat Shack with those values.
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Old 4th September 2006, 04:56 PM   #5
Jexx is offline Jexx  United States
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Great thanks!
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Old 4th September 2006, 05:23 PM   #6
Jexx is offline Jexx  United States
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Radio Shack only had the 1000uF cap, they had a 4700uF cap 35V that would have worked except it was axial and not radial! Biggest cap they had haha. I'm going to have to order via Digikey...
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Old 4th September 2006, 06:20 PM   #7
ilimzn is offline ilimzn  Croatia
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Default Re: Onkyo TX-DS939 problem...

Quote:
Originally posted by Jexx
Okay, so I did something pretty stupid.

I hooked up a JL w7 subwoofer (3 ohms) to my Onkyo TX-DS939 receiver (8 ohm minimum) to see if the sub worked. It was for a brief amount of time (not more than a couple of minutes).
I doubt that the problem happened due to the sub, but still, this was a bad thing to do. Electronics works on a time scale on the order of microseconds. 'A couple of minutes' is by no means a 'brief amount of time', as far as asking for a erious failure, it could as well have been a century.
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Old 4th September 2006, 07:23 PM   #8
Jexx is offline Jexx  United States
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I was honest because I wanted the help to get it fixed, because how the problem developed helps in the solution, NOT to get chastised. I already know what I did was stupid!

Anyway I replaced the caps and all is good now.
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Old 4th September 2006, 07:32 PM   #9
Netlist is offline Netlist  Belgium
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Jexx,

I'm sure it wasn't meant like that.
Glad you fixed the problem. Easy one hé!

/Hugo
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