Tuner Section - Sony HD-XB4K Service Manual

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3 7 63 1515 0

TUNER SECTION

Note: As a front-end (FE1) is difficult to repair if faulty, replace
it with new one.
AM Section Adjustment
Setting:
AM RF SSG
30% amplitude
modulation by
400 Hz signal
AM Tuned Level Adjustment
Band: AM
Procedure:
1. Set the output of SSG so that the input level of the set be-
comes 55 dB.
2. Tune the set to 999 kHz.
3. Adjust RV42 to the point (moment) when the TUNED indica-
tor will change from going off to going on.
Adjustment Location : TCB board
TE
L 13942296513
FM Section Adjustment
Note: This adjustment should be performed after the AM Tuned
Level Adjustment due to the same adjustment element.
Setting:
FM RF stereo signal
generator
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kH, 75 kHz
FM Tuned Level Adjustment
Band: FM
Procedure:
1. Supply a 25dBµ 98 MHz signal from the ANTENNA termi-
nal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV41 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 (Except Thai model)
loop antenna
60 cm
Field strength dB ( µ V/m) =SSG output level dB ( µ V/m) –26 dB.
75 Ω coaxial
set
FM ANTENNA terminal
deviation (100%)
(TM1) (75 Ω open)
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8
loop antenna
(Supplied accessories)
AM ANTENNA
terminal (TM1)
Adjustment Location:
[TCB BOARD] (Component Side)
Q Q
3 6 7 1 3
u163
.
– 35 –
2 9 9 4 2 8
set
IC2
RV42
AM Tuned
RV41
Level
FM Tuned Level
Adjustment
1 5 0 5 8 2 9 9 4
Adjustment
FE1
m
co
9 9
2 8 9 9
TM1