Sony CHC-P11 Service Manual page 14

TUNER SECTION
Precautions in Repairing
Note. 1 : The adjustment should be performed in the publication.
(MW — FM — SW)
Note. 2 : As a front-end (FE!) is difficult to repair if faulty, replace it
with new one.
@Abbreviation
AUS : Australian IT — : Italian
G : German AR _ : Argentine
EA _ : Saudi Arabia HK _ : Hong Kong
MX_: Mexican. SP _ : Singapore
MY : Malaysia TW _ : Taiwan
EE: East European
E2 _ : Tuner sections SW BAND do not exist.
E3 __: Tuner sections SW BAND exist.
MW Tuned Indication Lighting Level
Setting :
Band : MW
loop antenna B
loop antenna A
AM FF signal
generator
Cartier frequency : 999kHz (at 9kHz step) or
1,050kHz (at 10kHz step)
: 400Hz 30% modulation
Modulation
Procedure :
1. Set loop antenna A so that the loop antenna B input level becomes
55dB p/m (0.6mV/m)
2. Tune the set to 999kHz (at 9kHz step) or 1,050kHz (at 10kHz
step).
3. Adjust RV41 so that the TUNED indicatior goes on.
Adjustment Location : TCB board (see page 14)
FM Tuned Indication Lighting Level
Note : Always make the tuning level adjustment first.
(Since it affects the FM tuning level.)
Setting :
Band : Fw
FM PF stereo signal
generator
FM ANTENNA terminal
75 Q coaxial
Carrier frequency : 98MHz
Modulation
Output level
2 1kHz, 75kHz (100%)
2 0.018mV (25dBu)
Procedure :
1. Tune the set to 983MHz.
2. Adjust RV42 so that the TUNED indicator goes on.
Adjustment Location : TCB board (see page 14)
SW Control Voltage Adjustment
(Frequency Coverge Adjustment)
(E3,EA,MY,SP,HK,TW model)
Setting :
Band : SW
Procedure :
1. Connect digital Voltmeter to diode D1 center lead and ground.
2. Adjust for a following value reading on digital Voltmeter.
Adjustment | Readi digital
Set frequency } Meee
Pp voltmeter
5.95MHz 1.2Vde
SW
17.9MHz 8.5Vdc
Adjustment Location : TCB board (see page 14)
SW Tracking Adjustment
(E3,EA,MY,SP,HK,TW model)
Setting :
Band : SW
generator
Modulation : 400Hz
30% modulation
SPEAKER terminal
AM ANTENNA terminal
Procedure :
Adjust for maximum reading on Level mater.
Adjustment
part
rTM
@ Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustment should be finally done
by the trimmer capacitors.
Adjustment Location : TCB board (see page 14)