Sony HCD-H551, Service Manual

Page: 14 / 68

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TUNER SECTION 0dB=1µV
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
loop antenna
(Supplied accessories)
AM RF SSG
loop antenna
30% amplitude
modulation by
400Hz signal
60cm
AM antenna
terminal (TM1)
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
Procedure:
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 (EXCEPT Thailand model), RV41 (Thailand model)
to the point (moment) when the TUNED indicator will change
from going off to going on.
Adjustment Location: TCB board
set
Procedure:
1. Set the output of SSG so that the input level of the set becomes 55
dB.
2. Tune the set to 999 kHz or 1,050 kHz.
3. Adjust RV41 (EXCEPT Thailand model), RV42 (Thailand model)
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 after AM Tuned Level Adjustment.
Setting:
Band: FM
FM RF stereo signal
generator
75 coaxial
set
Carrier frequency: 98MHz
Modulation:
AUDIO 1kHz, 75kHz
deviation (100%)
Output level: 25dB (at 75 open)
Adjustment Location:
EXCEPT Thailand model
[TCB BOARD] (Component Side)
RV41
AM Tuned Level
Adjustment
RV41
TM1 IC41 RV42
RV42
FM Tuned Level
Adjustment
FE1
Thailand model
[TCB BOARD] (Component Side)
RV41
FM Tuned Level
Adjustment
IC2 RV41
RV42
AM Tuned Level
Adjustment
RV42
TM1
FE1
FM ANTENNA terminal
(TM1)