Am Section Adjustment; Am Tuned Level Adjustment; Fm Tuned Level Adjustment; Tuner Section - Sony HCD-RX80 Service Manual

TUNER SECTION

0 dB=1 µV
Note: As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.

AM Section Adjustment

Setting:
loop antenna
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Field strength dB ( µ V/m) =SSG output level dB ( µ V/m) –26 dB.

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 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 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 25 dBµ 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV42 to the point
(moment) when the TUNED indicator will change from going
off to going on.
Adjustment Location: TCB board
loop antenna
(Supplied accessories)
60 cm
75 Ω coaxial
set
FM ANTENNA terminal
(TM1) (75 Ω open)
– 33 –
set
AM ANTENNA
terminal (TM1)
Adjustment Location:
[TCB BOARD] (Component Side)
IC41
RV42
RV41
TM1
FE1