XR-C6103SP - Sony Car Audio Service Manual (repair manual). Page 15

– 15 –

Preset 

[3]

 (DOLBY) button

: NR OFF

SEL (BAS) button

: Center

SEL (TRE) button

: Center

SEL (BAL) button

: Center

SEL (FAD) button

: Center

SEL (VOL) button

: Maximum

D-BASS control

: OFF

Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV121 (L-CH) and RV221 (R-CH) so that the level

meter reading is –6 ± 1 dB (0.35 to 0.43 V).

Adjustment Location: See page 18.

0 dB=1 µV

Cautions during repair

When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.

Adjust the tuner section in the sequence shown below.

1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM (MW) Auto Scan/Stop Level Adjustment
4. FM POLAR Adjustment

[SOURCE]

 button: FM

Procedure:
1. Set to the test mode. (See page 14).
2. Push the 

[SOURCE]

 button and set to FM.

Display

3. Push the preset 

[3]

 button.

Display

4. Adjust with the volume RV2 on TU1 so that the “FM” indica-

tion turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put  out light “0” indication and adjustment.

Display

Adjustment Location: See page 18.

set

+
–

test tape
P-4-D400
(400 Hz, 0 dB)

MAIN board

level meter

MAIN board

TP (DOLBY L)/
TP (DOLBY R)

TP (GND)

    

      

FM RF signal

generator

Carrier frequency : 98.0 MHz
Output level

: 22 dB (12.6 

µ

V)

Mode

: mono

Modulation

: 1 kHz, 22.5 kHz deviation (30%)

0.01 

µ

F

set

antenna jack (J1)

FM

SHUF1

FM

SHUF1

SHUF1