Kenwood amp repair help - diyAudio
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Old 4th December 2007, 04:07 PM   #1
joefred is offline joefred  United States
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Default Kenwood amp repair help

I have a ? on trying to repair a kenwood amp. I accidentally touched the ground and power w/ my screw driver and didn't unhook the fuse from the battery.

Anyways, I read through the diy amp repair thing but one thing I did not see was for this. I noticed their is a paper thin piece of copper that is going off of the power terminal (i think) and it connects to part of the amp (this is on the opposite side of my amp, not on the circuit board side but on the "plan" side). Anyways this piece is kind of burnt and broken in half. So i am guessing this is what i shorted out. So can i replace this? How do I do that and where would I get it. Also would this be the cause to my problem.
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Old 4th December 2007, 04:56 PM   #2
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The trace can easily be repaired. When you power up the amp after repairing the trace, do so with a 10 amp fuse in series with the B+ line. If there are other problems, the fuse should blow and help prevent further damage.

You'll need to solder a piece of wire across the burned trace. The wire needs to have at least as much copper as the original trace. If possible solder the wire to the trace and to two endpoints/pads on the trace (preferably where another component is soldered into the board. If possible, solder the wire to the copper trace between the endpoints. Below I used desoldering braid but any copper wire will work.

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Old 4th December 2007, 08:51 PM   #3
joefred is offline joefred  United States
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what is a desoldering braid?

It looks like you just sodered the entire thing.

Where could I get some really thin copper wire like that? That is exactly what happened to my amp.
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Old 4th December 2007, 09:05 PM   #4
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You can use copper wire instead of braid. You can get desoldering braid at radio shack. If you buy it from RS, buy flux also. The braid is usually oxidized and won't accept the solder very well. Attached is a photo of the desoldering braid before soldering.

RS part numbers:
64-2090 Braid
64-022 Flux

I've never used their flux but it should work well enough for this. Before applying solder to the braid, coat it with the flux.

If you can see the braid in the package and it's bright copper (not brown), it may work well enough with the flux in the core of the solder (assuming your solder has a rosin flux core).
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File Type: jpg ttbraid.jpg (11.7 KB, 100 views)
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Old 4th December 2007, 10:48 PM   #5
joefred is offline joefred  United States
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that is great, thanks a lot.


Did this solve your problems? or did something similar happen to you?

Would shorting the amp that way be a usual occurrence of the trace getting toasted.
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Old 4th December 2007, 11:07 PM   #6
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I've seen this a lot on Kenwood and Pioneer amps. The heatsink is grounded directly to the ground terminal. When you shorted the 12v terminal to the heatsink, it burned the connection to the ground terminal of the amp. When you restore the connection, the amp should power up normally.

Remember to power up the amp via a 10 amp fuse. If it powers up and plays at low volume, you can reinstall the proper fuse.
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Old 5th December 2007, 03:23 PM   #7
joefred is offline joefred  United States
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cool


thanks for all the help
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Old 12th December 2007, 03:13 AM   #8
joefred is offline joefred  United States
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ok one last ?. I got that repaired. Amp turned on fine, and i heard some bass coming from the sub.

Then I put in 20's and turned it up and went to adjust the amp some, and adjusted the input sensitivity and then it flashed the light and the sub stopped working.

any ideas?
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Old 12th December 2007, 11:09 PM   #9
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What happens when you try to power it up after it cut out?

Did you confirm that you have both remote and B+ voltage at the amp? Place the black meter lead on the ground terminal of the amp when testing.
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Old 13th December 2007, 02:53 AM   #10
joefred is offline joefred  United States
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it is still powerd up. The main power light stay's on. The amp shows power, it was just not putting out any "power" to the speaker. It was when i tested it originally w/ the 10 amp. And again w/ the 20 amps it was hitting like it is supposed too. Then I adjusted the gain or what ever and the light flashed, came back on, then it stopped producing sound. So i cut it off and turned it off and tried again and nothing.
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