XR-2800, XR-2803 - Sony Car Audio Service Manual (repair manual). Page 15

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 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 Stereo Separation Adjustment.
3. AM (MW) Auto Scan/Stop Level 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. Adjust with the volume RV2 on TU1 so that the “FM” indica-

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

Display

Adjustment Location: See page 16.

FM

 

98.0

SHUF1

FM

 

98.0

SHUF1

[SOURCE]

 button: FM

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

Specification: Separation more than 26dB

Adjustment Location: See page 16.

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.

FM RF signal

generator

Carrier frequency : 98.0 MHz
Output level 

: 70 dB (3.2 mV)

Mode

: stereo

Modulation

: main: 1 kHz, 20 kHz deviation (26.7%)

sub: 1 kHz, 20 kHz deviation (26.7%)
19 kHz pilot: 7.5 kHz deviation (10%)

0.01 

µ

F

set

antenna terminal

+
–

speaker out terminal

level meter

4  

Ω

FM RF signal

generator

Carrier frequency : 98.0 MHz
Output level

: 20 dB (10.0 

µ

V)

Mode

: mono

Modulation

: 1 kHz, 22.5 kHz deviation (30%)

0.01 

µ

F

set

antenna terminal