[amsat-bb] Yaesu G-5400B calibration

I have a Yaesu G5400B that came in in a box all disassembled.

I put the azimuth unit together and it is working ok, But I am unable to calibrate it. The direction indicator works and follows with the rotor but is off.

Is there a correct way to position the potentiometer when re assembling?

I have followed the manual as to calibration set up.

Any ideas?

Thanks de John KØCQW