Blown outputs? Kenwood KR-4200 receiver

OSIDEDM · 20th January 2011, 01:33 AM

The garage receiver - vintage solid state - just lost most of the left channel volume, and the speaker relay is clicking on/off, even with no load. 1st thought is that it's bad output transistors (original equipment NEC 2SA626/2SD180). A quick visual inspection showed no burned resistors etc. But before I go and order parts, are there ideas on anything else that may have gone wrong?

Also, any suggestions on newer style parts, since that NEC design is really old stuff?

Silently awaiting help.....
OsideDM

bob91343 · 20th January 2011, 02:50 AM

Don't try to fix this by recommendations or by guessing. Don't buy parts.

Get the service manual and measure voltages and waveforms so you can do it right. You may have nothing more than a bad connection or maybe something really major, but don't expect us to know without some information.

OSIDEDM · 20th January 2011, 01:44 PM

Thanks for the reply. Hopefully the service docs. are still available.

kevinkr · 02:10 PM

Quote:

Originally Posted by OSIDEDM

Thanks for the reply. Hopefully the service docs. are still available.

Google is your friend..

Here: http://www.eserviceinfo.com/download...od_KR4200.html

Service manual here: http://www.eserviceinfo.com/download.php?fileid=47852

I had a KR-5200 that I bought used from an Atlanta HiFi shop in 1976... http://www.hifiengine.com/gallery/im...ooks-new.shtml

OSIDEDM · 20th January 2011, 04:13 PM

Thanks for the link. Perfect. Looks like I get to fire up the old EICO VTVM.....

The pic of your KR 5200 looks almost exactly like this 4200. Mine is only 26 W/Channel and not a lot of real fidelity, but it has been used/abused for 20 years without any problems. OK tuner section. Worth fixing, IMO.

Thanks again
OSIDEDM

20th January 2011, 01:33 AM	#1
OSIDEDM diyAudio Member Join Date: Jan 2011	Blown outputs? Kenwood KR-4200 receiver The garage receiver - vintage solid state - just lost most of the left channel volume, and the speaker relay is clicking on/off, even with no load. 1st thought is that it's bad output transistors (original equipment NEC 2SA626/2SD180). A quick visual inspection showed no burned resistors etc. But before I go and order parts, are there ideas on anything else that may have gone wrong? Also, any suggestions on newer style parts, since that NEC design is really old stuff? Silently awaiting help..... OsideDM

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20th January 2011, 02:50 AM	#2
bob91343 diyAudio Member Join Date: Mar 2010	Don't try to fix this by recommendations or by guessing. Don't buy parts. Get the service manual and measure voltages and waveforms so you can do it right. You may have nothing more than a bad connection or maybe something really major, but don't expect us to know without some information.

20th January 2011, 01:44 PM	#3
OSIDEDM diyAudio Member Join Date: Jan 2011	Thanks for the reply. Hopefully the service docs. are still available.

20th January 2011, 04:13 PM	#5
OSIDEDM diyAudio Member Join Date: Jan 2011	Thanks for the link. Perfect. Looks like I get to fire up the old EICO VTVM..... The pic of your KR 5200 looks almost exactly like this 4200. Mine is only 26 W/Channel and not a lot of real fidelity, but it has been used/abused for 20 years without any problems. OK tuner section. Worth fixing, IMO. Thanks again OSIDEDM

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