Sony HCD-D90AV Service Manual page 16

TUNER SECTION
Note 1: As a front-end (FE1) is difficult to repair if faulty, replace
it with new one.
Note 2: No adjustment is needed due to a tuner pack for except
AEP, UK, German, East European, CIS models.
AM Tuned Level Adjustment
Note: FM Tuned Level adjustment should be performed after this
AM Tuned Level Adjustment.
Setting:
Band: MW
loop antenna
AM RF SSG
30% amplitude
modulation by
400Hz signal
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
Procedure:
1. Set the output of SSG so that the input level of the set becomes
55 dB or 58 dB. (55 dB: Except East European, CIS model, 58
dB: East European, CIS model)
2. Tune the set to 999 kHz or 1,050 kHz.
3. Adjust RV41 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 Adjustment.
Setting:
FM RF SSG
Carrier frequency: 98MHz
Modulation: AUDIO 1kHz, 75kHz
deviation (100%)
Output level: 25dB (at 75
23dB (at 75
Band: FM
Procedure:
1. Supply a 25 dB or 23 dB 98 MHz signal from the ANTENNA
terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board
0dB=1µV
loop antenna
(Supplied accessories)
60cm
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
75 coaxial
set
FM ANTENNA terminal (TM1)
open) (Except East European, CIS model)
open) (East European, CIS model)
set
AM antenna
terminal (TM1)
Adjustment Location
[TCB BOARD] (Component Side)
RV41
AM Tuned Level
RV42
FM Tuned
Level
— 16 —
TM1
IC21