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evlah  
#1 Posted : Sunday, May 11, 2014 1:37:01 PM(UTC)
evlah

Rank: Member

Groups: Member
Joined: 11/3/2013(UTC)
Posts: 2
Greece

Hello,

I cannot trim the DC offset on the right Balanced output of the Legato 3.1.
I am getting approximately .5V (does not vary with trim pot) when I connect it to the Buffalo III.
Replaced all fets and transistors, reworked board looking for cold solder joints but problem still persists.
SE output can be trimmed no problem.
I am getting 8.9V -toGND and 9.4V +toGND.
It trims to zero fine without Buffalo connected.
Any ideas?

Thanks,
Evan
evlah  
#2 Posted : Sunday, May 11, 2014 2:31:39 PM(UTC)
evlah

Rank: Member

Groups: Member
Joined: 11/3/2013(UTC)
Posts: 2
Greece

0.5V on J6 to GND not on J5 (jumpers not installed) stock parts and gain.
Circuit was zeroing fine until I started probing around....

Edited by user Wednesday, May 14, 2014 6:53:53 PM(UTC)  | Reason: added details

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