Sony HCD-H991AV, Service Manual

Page: 14 / 100

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TUNER SECTION 0dB=1
µ
V
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
Field strength dB (
µ
V/m) = SSG output level dB (
µ
V/m) –26dB.
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 US, CND, E2, AR, AUS, TH model), RV42
(US, CND, E2, AR, AUS, TH 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 performed after the AM Tuned Level
Adjustment.
Setting:
Band: FM
RV41
AM Tuned Level
RV41
IC41 RV42
RV42
FM Tuned Level
US, CND, E2, AR, AUS, TH model
[TCB BOARD] (Component Side)
RV41
FM Tuned Level
IC2 RV41
RV42
AM Tuned Level
RV42
FE1
Adjustment Location
except US, CND, E2, AR, AUS, TH model
[TCB BOARD] (Component Side)
TM1
• Abbreviation
CND: Canadian model.
AR:
Argentine model.
AUS: Australian model.
TH:
Thailand model.
E2: Without SW tuner model.
AM RF SSG
30% amplitude
modulation by
400Hz signal
60cm
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
AM antenna
terminal (TM1)
loop antenna
(Supplied accessories)
Procedure:
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 (except US, CND, E2, AR, AUS, TH model), RV41
(US, CND, E2, AR, AUS, TH model) to the point (moment) when
the TUNED indicator will change from going off to going on.
FE1
TM1
FM RF stereo signal
generator
75
Ω
coaxial
set
Carrier frequency: 98MHz
Modulation:
AUDIO 1kHz, 75kHz
deviation (100%)
Output level: 25dB (at 75
Ω
open)
FM ANTENNA terminal
(TM1)
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