one chan dead on sansui au-4400 amp. - diyAudio
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Old 31st December 2003, 02:44 PM   #1
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Smile one chan dead on sansui au-4400 amp.

i am working on a sansui stereo amp au-4400 which has one chan dead. the faulty channel has the output rail grounded when it should have 28v. i have reverse engineered the schematic but am having a hard time locating the fault. anybody to assist!!!
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Old 31st December 2003, 06:07 PM   #2
sreten is offline sreten  United Kingdom
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Use the working channel to get a series of test point voltages,
and check the non-working channel against these.

Try interchanging the output devices between channels.

sreten.
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Old 3rd January 2004, 07:56 PM   #3
lucpes is online now lucpes  Romania
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Good info on amplifier repairing:

http://sound.westhost.com/troubleshooting.htm

http://margo.student.utwente.nl/el/audio/amphelp.htm

Also try the 'Exclusively Sansui' forum at audiokarma.org:

http://www.audiokarma.org/forums/for...php?forumid=39
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Old 17th November 2009, 01:44 PM   #4
hew128 is offline hew128  Singapore
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Quote:
Originally Posted by dzikamai View Post
i am working on a sansui stereo amp au-4400 which has one chan dead. the faulty channel has the output rail grounded when it should have 28v. i have reverse engineered the schematic but am having a hard time locating the fault. anybody to assist!!!
Hi,

I am searching for the AU-4400 service manual as well and wondering if you had any luck in your search.

Thanks!
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