MDX-C7890R - Sony Car Audio Service Manual (repair manual). Page 15

– 15 –

– 16 –

[SOURCE]

button: MW

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

[SOURCE]

button and set to FM.

3. Push the

[MODE]

button and set to MW .

Display

4. Adjust with the volume RV1 on TU1 so that the “MW” indi-

cation turns to “MW0” indication on the display window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.

Display

Adjustment Location: See page 16.

AM RF signal

generator

set

AM dummy antenna
(50 

Ω

)

30 

Ω

15 pF

65 pF

antenna jack (J1)

Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level

: 33 dB (44.7 

µ

V)

SHUF

REG

TP

SHUF

REG

TP

 

[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

[10]

button.

4. Adjust RV1 on MAIN board so that the display indication is

“15.8”.

Display

Specification: Display indication : 15.6 to 16.4

Adjustment Location: See page 16.

Carrier frequency : 98.0 MHz
Output level

: 35 dB (56.2 

µ

V)

Mode

: mono

Modulation

: no modulation

FM RF signal

generator

0.01 

µ

F

set

antenna jack (J1)

SHUF

REG

SHUF

REG

RV1 RDS S-METER Adjustment

– SET UPPER VIEW –

TU1

RV2  FM AUTO SCAN/STOP LEVEL Adjustment

RV1  MW AUTO SCAN/STOP LEVEL Adjustment

RV4  FM STEREO SEPARATION Adjustment