XR-C453RDS - Sony Car Audio Service Manual (repair manual). Page 15

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SOURCE button: FM

[Note]
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM Signal Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment

SOURCE button: FM

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

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)

Procedure:
1. Set to the test mode. (See page 14).
2. Push the SOURCE button and set to FM.

FM

INTRO

REG

3. Push the preset 3 button.

INTRO

REG

FM

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.

INTRO

REG

Adjustment Location: See page 17.

FM RF signal

generator

Carrier frequency : 98.0 MHz
Output level

: 70 dB (3.2 mV)

Mode

: stereo

Modulation

: main: 1 kHz, 33.75 kHz deviation (45%)
  sub: 1 kHz, 33.75 kHz deviation (45%)

:

 19 kHz pilot: 7.5 kHz deviation (10%)

0.01 

µ

F

set

antenna jack (J1)

+
–

LINE OUT (CNJ150)

level meter

10 k 

Ω

L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.

Specification: Separation more than 26 dB

Adjustment Location: See page 17.

FM Stereo

Level meter

Level meter

signal generator

connection

reading (dB)

output channel

L-CH

L-CH

A

B

R-CH

L-CH

Adjust RV4 on TU1

for minimum reading.

R-CH

R-CH

C

D

L-CH

R-CH

Adjust RV4 on TU1

for minimum reading.