Sony HCD-D890AV Service Manual page 15

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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, East European, CIS models.
AM Tuned Level Adjustment
(AEP, UK, East European, CIS model only)
Note: FM Tuned Level adjustment should be performed after this
AM Tuned Level Adjustment.
Setting:
Band: MW
AM RF SSG
30% amplitude
modulation by
400Hz signal
Modulation: 999 kHz
Procedure:
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L 13942296513
1. Set the output of SSG so that the input level of the set becomes
55 dB.
2. Tune the set to 999 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
(AEP, UK, East European, CIS model only)
Note: This adjustment should be performed after the AM Tuned
Level Adjustment.
Setting:
Band: FM
FM RF SSG
Carrier frequency: 98MHz
Modulation: AUDIO 1kHz, 75kHz
deviation (100%)
25dB (at 75 Ω open)
Output level:
Procedure:
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
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3. Adjust RV42 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board .
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0dB=1µV
loop antenna
60cm
Field strength dB ( µ V/m) = SSG output level dB ( µ V/m) –26dB.
75 Ω coaxial
set
FM ANTENNA terminal (TM1)
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2 9
8
loop antenna
(Supplied accessories)
AM antenna
terminal (TM1)
Adjustment Location
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3 6 7 1 3 1 5
[TCB BOARD] (Component Side)
RV41
AM Tuner Level
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.
– 15 –
9 4 2 8
set
0 5 8 2 9 9 4
TM1
RV42
FM Tuned
Level
IC21
m
9 9
2 8 9 9