Studer A730 CD player output line adjust, help with schematics

[jtvrdy]

Hi, I have a Studer A730 CD player that need to adjust the line level (the right chanel is a bit lower than left) in the manual says that with R101(shematics attached) is for line output but there is also R109 for what is this?

thanks.

 

[PRR]

Do you have precision test gear? R109 is adjusted so the gain from IC77 pin 6 to the differential output is exactly unity. Then R101 trims any other errors or preferences.

 

[jtvrdy]

I have oscilloscope , so I can check that playing test CD with 1k tone the signal is the same in the IC11 pin6 and the diferencial output, but at which point exactly? T1 pin9? pin1 is the same inverted?

thanks.