L/R Output Level Adjustment Procedure; Necessary Equipments; Connection Procedure; Adjustment Procedure - Marantz SA-11S1 Service Manual

6. L/R OUTPUT LEVEL ADJUSTMENT
PROCEDURE
Cases adjustment is needs
When a Q201 or Q251 is replaced.

Necessary equipments

AC voltmeter 2 sets (or Oscilloscope)
CD TEST DISC: CBC429 Audio signal disc1 (4822-397-30155)

Connection procedure

Connect the ANALOG OUTPUTS terminal (L/R) on the rear
panel and AC voltmeter with cable as follow.

Adjustment procedure

Play back the Track 1 (1 kHz 0dB L+R) of the TEST DISC
(SBC429).
Adjust trimming resister (R205) according to AC voltmeter read-
ings of L ch output level and R ch output level.
The output level difference of the L ch and R ch is adjusted to
less than 50mV.
If R205 is turned clockwise, the level of R ch will become large,
and if it turns to anticlockwise rotation, the level of L ch will
become large.
R ch: Smaller
L ch: Larger
R L
– +
R ch: Larger
L ch: Smaller
R205
– +
1-6
R205