Sony HCD-MJ1, Руководство по обслуживанию

Страница: 19 / 68

– 19 –
FM Stereo Separation Adjustment
Setting :
FM RF SSG
FM ANTENNA terminal (TM1)
set
Carrier frequency : 98MHz
Output level
: 1mV (60dB)
Modulation
Main (1kHz) : 33.75kHz dev. (45%)
Sub (1kHz) : 33.75kHz dev. (45%)
Pilot (19kHz) : 7.5kHz dev. (10%)
+
–
J601 (LINE OUT)
47k
Ω
level meter
Procedure :
Turn the set to 98MHz.
FM stereo VTVM VTVM
signal generator connection reading (dB)
output channel
L-CH L-CH
A
R-CH L-CH
B
Adjust RV (FM STEREO
SEPARATION ADJUST-
MENT) for minimum read-
ing.
R-CH R-CH
C
L-CH R-CH
D
Adjust RV (FM STEREO
SEPARATION ADJUST-
MENT) for minimum read-
ing.
L-CH Stereo separation :
A
-
B
R-CH Stereo separation :
C
-
D
The separations of both channels should be equal.
Adjustment Location : TB1 (TUNER board)
[TB1 TUNER BOARD]
(Conductor side )
RV (FM TUNED
LEVEL ADJUSTMENT)
RV (AM TUNED LEVEL ADJUSTMENT)
RV (FM STEREO SEPARATION ADJUSTMENT)
IC
IC
TUNER SECTION
As a front-end (TB1) is difficult to repair if faulty, replace it with
new one.
But AEP, UK, German, and Italian model are please note, however,
that the following adjustments are possible:
AM Section Adjustment
AM Tuned Indication Lighting Level Adjustment
Band : AM
Setting :
60 cm
AM ANTENNA
terminal (TM1)
set
AM RF SSG
carrier frequency : 999kHz
Modulation : 400Hz 30%
loop antenna
loop antenna of
accessories
Procedure :
1. Set AM RF SSG output level to 81dB
µ
so that the input level
becomes 55dB
µ
.
2. Tune the set to 999kHz .
3. Adjust RV(AM TUNED LEVEL ADJUSTMENT) so that the
TUNED light up.
Adjustment Location : TB1 (TUNER board)
FM Section Adjustment
FM Tuned Indication Lighting Level Adjustment
Band : FW
Setting :
FM RF SSG
FM ANTENNA terminal (TM1)
set
carrier frequency : 98MHz
Modulation
: 1kHz,75kHz deviation
Procedure :
1. Supply a 17.8
µ
V (25dB
µ
) 98MHz signal to the ANTENNA ter-
minal.
2. Tune the set to 98MHz.
3. Adjust RV(FM TUNED LEVEL ADJUSTMENT) so that the
TUNED light up.
Adjustment Location : TB1 (TUNER board)