Tuner Section; Am Section Adjustment; Am Tuned Level Adjustment; Fm Section Adjustment - Sony HCD-XB4 Service Manual

TUNER SECTION

0dB=1µV
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 or MW
Procedure:
1. Set the output of SSG so that the input level of the set becomes
55 dB.
2. Tune the set to 1,050 kHz (US, CND models), 999 kHz (other
models).
3. Adjust RV41 (AEP, UK models), RV42 (other models) to the
point (moment) when the TUNED indicator will change from
going off to going on.
Adjustment Location : TCB board

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
deviation (100%)
FM Tuned Level Adjustment
Band: FM
Procedure:
1. Supply a 25dBµ 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV42 (AEP, UK
models), RV41 (other models) to the point (moment) when the
TUNED indicator will change from going off to going on.
Adjustment Location: TCB board
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
(TM1) (75 Ω open)
loop antenna
(Supplied accessories)
set
AM ANTENNA
terminal (TM1)
Adjustment Location:
AEP, UK model
[TCB BOARD] (Component Side)
RV42
Other model
[TCB BOARD] (Component Side)
• Abbreviation
CND: Canadian model
– 34 –
IC41
RV41
TM1
FE1
IC2
RV42
RV41
TM1
FE1