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Old 3rd August 2014, 04:50 AM   #1
chipper is offline chipper  United States
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Default Kenwood home stereo receiver

Hey guys I have a older kenwood home stereo receiver. The problem is that one half of the channels are putting out staticky sound while the other sounds clear. I'm not sure what caused it always ran kenwood book shelf 140 watt 6 ohm speakers with it for years. I checked the output transistors with my multi meter those check out fine.


I have some experience with this but with car audio amplifiers never done a home audio amplifier.

Can anyone help me out on this one? I had this for many years hate to get rid of it...

Thanks
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Old 3rd August 2014, 04:53 AM   #2
chipper is offline chipper  United States
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This is the receiver I'm talking about
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Old 3rd August 2014, 04:54 AM   #3
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Another pic
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Old 3rd August 2014, 04:56 AM   #4
chipper is offline chipper  United States
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I noticed this gets hot
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Old 3rd August 2014, 04:57 AM   #5
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Another
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Old 3rd August 2014, 04:58 AM   #6
chipper is offline chipper  United States
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The output stage
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Old 3rd August 2014, 05:15 AM   #7
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I would check the output transistors and associated circuitry for dry or cracked joints.

The regulator getting hot is quite normal, as long as you can touch it it'll be OK.

Another source of crackling can be dirty switch or potentiometer contacts.

If you can get the schematic it might be worth replacing any electrolytics in the signal path.
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Old 3rd August 2014, 05:24 AM   #8
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The schematics for the KR-A4040R are available FREE from HiFi Engine - Owners and Service Manuals, the (R) suffix I'm guessing is for Remote Control.
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Old 3rd August 2014, 05:57 AM   #9
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Quote:
Originally Posted by KatieandDad View Post
The schematics for the KR-A4040R are available FREE from HiFi Engine - Owners and Service Manuals, the (R) suffix I'm guessing is for Remote Control.
One set of the channels produce a distorted sound. That regulator gets pretty I can't keep my finger on it no longer than a few seconds.. Where's the signal section for it? Output transistors are fine on the distorted channel.
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Old 3rd August 2014, 07:44 AM   #10
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IC5 getting VERY hot may be indicative of a failing decoupling cap. The favourites would be those close to the heatsink that are getting cooked by the heat.
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