Power Amp Repair Attempt

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=40901
Printed Date: May 13, 2025 at 3:20 PM

Topic: Power Amp Repair Attempt

Posted By: robb420in323
Subject: Power Amp Repair Attempt
Date Posted: October 14, 2004 at 6:40 PM

I looked inside it only blew 2 reisitors and a mosfet.. the resistors are 220 ohms, +/-5%.... and the mosfet i dont know how to locate a replament or identify it.. It has C4511 underneith s m and at the bottom it has 10 P..

Its a Kenwood KAC-649S 4/3/2 ch

I want to get it running and drive some midbass kickers with it. I have the same one in my car for my midbass - highs

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Hunter S. Thompson for sheriff

Replies:

Posted By: furflier
Date Posted: October 14, 2004 at 8:26 PM

Check mouser.com they should have a cross for that part #c4511. But be warned if you really don't know what you are doing you could make matters worse.

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Posted By: hotwaterwizard
Date Posted: October 14, 2004 at 8:44 PM

Well I have a service manual in PDF Format if you need it.

This is not the Owners Manual it is the one the Techs use to fix it with.

I can not post PDF Here but I can Put up a Schematic if you like.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: robb420in323
Date Posted: October 14, 2004 at 9:00 PM

That would be great man. if you could help me with that schematic..

Things cant get any worse with this amp. i got it for free. its blown..

if it works it works if it doesnt then the loud pop will be oh so fun.

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Hunter S. Thompson for sheriff

Posted By: hotwaterwizard
Date Posted: October 14, 2004 at 9:08 PM

What Resistors and Mosfets Get the numbers on the board.

Q38, Q41, Q42, Q45 are all the same.

I can tell you the resistor values if you give me the numbers on the board.

They will begin with R Like R23 for example.

Here is the Datasheet for the Mosfet.

These Devices are Static sensitive and you must wear some sort of Ground Strap when replacing them, You must also use a Grounded Soldering Iron. And wrap wire around the Pins to short them out before Installing them. Then remove the wire after it is installed.

[https://www.allegromicro.com/skncatlg/pwrxtr/2sc4511.pdf

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: October 14, 2004 at 9:27 PM

Kenwood KAC-649S one Channel Output Stage.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: robb420in323
Date Posted: October 15, 2004 at 9:19 AM

your help is greatly appriciated... good ontap resources.

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Hunter S. Thompson for sheriff