Sony CDX-C680 Service Manual page 29

AM Auto Scan/Stop Level Adjustment
Setting :
SOURCE n MODE button : AM
AM RF signal
generator
AM dummy
antenna(50 Ω )
Carrier frequency : 1000 kHz
30% amplitude
modulation by
1 kHz signal
: 33 dB (44.7 µ V)
output level
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
TP
4. Push the preset 3 button.
Display
TP
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
TP
Adjustment Location : tuner unit (TU10)
30 Ω
15 pF
65 pF
set
antenna
terminal
1ALL
1ALL
1ALL
– 29 –
Adjustment Location : tuner unit (TU10)
–set upper view–
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)