CDX-C680, CDX-C780 - Sony Car Audio Service Manual (repair manual). Page 29

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Adjustment Location : tuner unit (TU10)

–set upper view–

SOURCE 

n MODE button : AM

Procedure :
1. Set to the test mode. (See page 27.)
2. Push the  SOURCE  button.
3. Push the  MODE  button and set to AM.

Display

4. Push the preset  3  button.

Display

5. Adjust with the volume RV1 on TU10 so that the “AM”

indication turns to “AM0” indication on the display window.
But, in case of already indicated “AM0”, turn the RV1 so that
put out light “0” indication and adjustment.

Display

Carrier frequency : 1000 kHz
30% amplitude
modulation by
1 kHz signal
output level

: 33 dB (44.7 

µ

V)

Adjustment Location : tuner unit (TU10)

TU10

RV1

AM AUTO SCAN/

STOP LEVEL ADJ

RV2

FM AUTO SCAN/

STOP LEVEL ADJ

RV3

FM STEREO

SEPARATION ADJ

(WIDE)

RV4

FM STEREO

SEPARATION ADJ

(NARROW)

AM RF signal
generator

antenna
terminal

AM dummy
antenna(50 

Ω

)

30 

Ω

65 pF

15 pF

set