one chan dead on sansui au-4400 amp.

[dzikamai]

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!!!

 

[sreten]

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.

 

[lucpes]

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/forumdisplay.php?forumid=39

 

[hew128]

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!