Sony ST-V702 - Electrical Adjustments

Signal of System Control Connector
CNJ901
SYSTEM CONTROL 1
@
| ST- V502
CNJ701
SYSTEM CONTROL 2
@
SECTION 2
ELECTRICAL ADJUSTMENTS
FM DISCRIMINATOR ADJUSTMENT
Setting:
FM rf signal
generator
set
C——>
9
FM
750
terminals
Carrier
frequency
:
98MHz
Modulation
:
IkHz,
40kHz
deviation
(100%)
Output
level
:
ImV
(60dB)
NULL Terminal
o_O 0
| { | |
Procedure :
1. Tune the set to 98MHz.
2. Adjust T21 for 0V reading on the VOM.
Note: FM tuning level adjustment should be made after FM
discriminator alignment.
FM TUNING LEVEL ADJUSTMENT
Setting :
FM rf stereo signal
generator
FM75Q
terminals
Carrier frequency: . 98MHz
Modulation : LkHz, 40kHz deviation (100%)
Output level : 17.8uV (25dB)
Procedure:
1. Tune the set to 98MHz.
2.
Adjust
RV24
so
that
the
TUNED
LED
goes
on.
FM STEREO SEPARATION ADJUSTMENT
Procedure:
FM rf stereo
Signal
generator VTVM
FM75Q OUTPUT
terminals
CNJ702@
=
L-CH
Carrier
frequency
:
98MHz
@:
R-CH
Output
level
:
ImV
(60dB)
Modulation
Audio
400Hz
:
16.25kHz
deviation
Sub channel 38kHz :
Pilot signal 19kHz:
16.25kHz deviation
7.5kHz deviation