Tuner Section - Sony HCD-D670AV - Compact Disk Deck Receiver Service Manual

TUNER SECTION

0dB=1 V
Note : As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.
AM Tuned Level Adjustment
Note : FM Tuned Level adjustment should be performed after this
AM Tuned Level adjustment.
Setting :
Band : AM or MW
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Carrier frequency : 999kHz (at 9kHz step)
1050kHz (at 10 kHz step)
Procedure :
1. Set the output of SGG so that the input level of the set becomes 55
dB.
2. Tune the set to 999 kHz or 1050 kHz .
3. Adjust RV41 (AEP, UK, IT, G models), RV42 (other models) to
the point (moment) when the TUNED indicator will change from
going off to going on.
Adjustment Location : TCB board
FM Tuned Level Adjustment
Note : This adjustment should be performed after the AM Tuned
Level Adjustement.
Setting :
Band : FM
FM RF stereo signal
generator
75 coaxial
Carrier frequency : 98MHz
Modulation : AUDIO 1kHz, 75kHz
deviation (100%)
Output level : 25dB (at 75 open)
Procedure :
1. Supply a 25dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 (AEP, UK, IT, G models), RV41 (other models) to
the point (moment) when the TUNED indicator will change from
going off to going on.
Adjustment Location : TCB board
loop antenna
60 cm
set
FM ANTENNA terminal
(TM1) (75 )
— 14 —
• Abbreviation
G : German model
IT : Italian model
loop antenna
(Supplied accessories)
AM antenna
terminal (TM1)
Field strength dB ( V/m)=SGG output level dB ( V/m)–26dB.
Adjustment Location
AEP, UK, G, IT model
[TCB BOARD] (Component Side)
IC41
RV42
FM Tuned Level
Other model
[TCB BOARD] (Component Side)
RV41
FM Tuned Level
RV41
AM Tuned Level
TM1
FE1
RV42
IC2
AM Tuned
Level
TM1
FE1