The service manual is really great - thanks to it I was able to install the laser unit and thus "save" my CD-player, which seemed to be impossible before I had the manual.
Complete manual as pdf-file in very good quality. Very helpful and fast availability.
Text excerpt from page 15 (click to view)
AV-32430 AV-32432 3.4.3.3 SETTING METHOD
[1.V/C(S), 2.DEF(D) AND 3.SOUND(A) ADJUSTMENT MODE] 1) Press the [CHANNEL (-/+)] keys to select the one of setting item from S01 BRIGHT to S21 AGC ADJ. 2) Press the [VOLUME (-/+)] keys to change the setting value. The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys. It can adjust the items 2.DEF(D) and 3.SOUND(A) in the same procedure. [7.LOW LIGHT, 8.HIGH LIGHT AND 9.VCO ADJUSTMENT MODE] Since the key operation in this mode is peculiar, please refer to the clause of the "ADJUSTMENT PROCEDURE". [4.OTHERS AND 11.I2C BUS ADJUSTMENT MODE] These are no requirement for adjustment. Don't change these values. 3.4.3.4 Release of SERVICE MENU When adjustment is completed, press the [EXIT] key twice. Then return to the normal screen.