Tuner Section - Sony HCD-GRX9000 Service Manual

TUNER SECTION 0 dB=1 µV
(East European, CIS models only)
Note: As a front-end (FE1) is difficult to repair if faulty, replace it with
new one.
MW Section Adjustment
Note: FM Tuned Level Adjustment should be performed after this MW
Tuned Level Adjustment.
Setting:
loop antenna
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Field strength dB ( µ V/m) =SSG output level dB ( µ V/m) –26 dB.
MW Tuned Level Adjustment
Band: MW
Procedure:
1. Set the output of SSG so that the input level of the set be-
comes 55 dB.
2. Tune the set to 1,050 kHz.
3. Adjust RV41 to the point (moment) when the TUNED indica-
tor will change from going off to going on.
Adjustment Location : TCB board
FM Section Adjustment
Note: This adjustment should be performed after the MW Tuned Level
Adjustment due to the same adjustment element.
Setting:
FM RF stereo signal
generator
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
FM Tuned Level Adjustment
Band: FM
Procedure:
1. Supply a 25 dBµ 98 MHz signal from the ANTENNA termi-
nal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV42 to the
point (moment) when the TUNED indicator will change from
going off to going on.
Adjustment Location: TCB board
loop antenna
(Supplied accessories)
60 cm
75 Ω coaxial
set
FM ANTENNA terminal
(TM1) (75 Ω open)
– 16 –
set
MW ANTENNA
terminal (TM1)