XR-C6090R, XR-C6100R - Sony Car Audio Service Manual (repair manual). Page 16

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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 RV401 (L-CH) and RV301 (R-CH) so that the level

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

Adjustment Location: See page 19.

set

+
–

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

MAIN board

level meter

MAIN board

TP (DOLBY L)/
TP (DOLBY R)

TP (GND)

    

      

 0 dB=1 µV

When the tuner unit is defective, replace it by a new one be-
cause 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 Noise Focus Adjustment

3.

FM Stereo Separation Adjustment

4.

FM Signal Meter Adjustment

5.

AM (MW) Auto Scan/Stop Level Adjustment

[SOURCE]

 button: FM

Procedure:
1. Set to the test mode. (See page 15.)
2. Push the 

[SOURCE]

 button and set to FM.

Display

3. 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 19.

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

INTRO

REG

INTRO

REG