Onkyo TX-DS939 problem...

Jexx · 4th September 2006, 03:49 PM

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

Netlist · 4th September 2006, 04:19 PM

These caps are definitely bad. Replace and see.

/Hugo

Jexx · 4th September 2006, 04:40 PM

Okay, desoldered them.

One is 4700uF @25V

The other is 1000uF @35V

Where can I get replacements?

astouffer · 4th September 2006, 04:44 PM

www.digikey.com

www.mouser.com

Maybe even Rat Shack with those values.

Jexx · 4th September 2006, 04:56 PM

Great thanks!

Jexx · 4th September 2006, 05:23 PM

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...

ilimzn · 4th September 2006, 06:20 PM

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.

Jexx · 4th September 2006, 07:23 PM

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.

Netlist · 4th September 2006, 07:32 PM

Jexx,

I'm sure it wasn't meant like that.

Glad you fixed the problem. Easy one hé!

/Hugo

4th September 2006, 03:49 PM	#1
Jexx diyAudio Member Join Date: Jun 2006	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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4th September 2006, 04:19 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	These caps are definitely bad. Replace and see. /Hugo

4th September 2006, 04:40 PM	#3
Jexx diyAudio Member Join Date: Jun 2006	Okay, desoldered them. One is 4700uF @25V The other is 1000uF @35V Where can I get replacements?

4th September 2006, 04:44 PM	#4
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	www.digikey.com www.mouser.com Maybe even Rat Shack with those values.

4th September 2006, 04:56 PM	#5
Jexx diyAudio Member Join Date: Jun 2006	Great thanks!

4th September 2006, 05:23 PM	#6
Jexx diyAudio Member Join Date: Jun 2006	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...

4th September 2006, 07:23 PM	#8
Jexx diyAudio Member Join Date: Jun 2006	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.

4th September 2006, 07:32 PM	#9
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Jexx, I'm sure it wasn't meant like that. Glad you fixed the problem. Easy one hé! /Hugo