Sony MHC-D7 - 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 (FE1) is difficult to repair if faulty, replace
it with new one.
@ Abbreviation
CND : Canadian AUS: Australian
IT _ : Italian JE : Tourist
G : German AR _ : Argentine
EE :EastEuropean E2 _ : Tuner sections SW BAND do
SU _ : Russian not exist.
IA _— : Indonesia E3 : Tuner sections SW BAND
EA — : Saudi Arabia exist.
HK _ : Hong Kong MX _ : Mexican
SP _: Singapore TH _ : Thailand
MY : Malaysia
MW Tuned Indication Lighting Level
Setting :
Band : MW
loop antenna B
Procedure :
1. Set loop antenna A so that the loop antenna B input level
becomes 55dB yu /m (0.6mV/m)
2. Tune the set to 999kHz (at 9kHz step) or 1,050kHz (at 10kHz
step).
3. Adjust RV41 (AEP, UK, G, IT, E3, EA, MY, SP, HK, JE, IA,
EE, CIS model), RV42 (US, CND, E2, AUS, AR, MX, TH
model) so that the TUNED indicator goes on.
loop antenna A
AM PF signal
generator
Carrier frequency : 999kHz (at 9kHz step) or
1,050kHz (at 10kHz step)
Adjustment Location : TCB board (see page 14)
FM Tuned Indication Lighting Level
Note : Always make the tuning level adjustment first.
(Since it affects the the FM tuning level.)
Setting :
Band : FM
FM PF stereo signal
generator
FM ANTENNA terminal
75 Q coaxial
Canrier frequency : 98MHz
Modulation : OFF
Output level : 0.018mV (25dBy )
Procedure :
1. Tune the set to 983MHz.
2. Adjust RV41 (US, CND, E2, AUS, AR, MX, TH model),
RV42 (AEP, UK, G, IT, E3, EA, MY, SP, HK, JE, IA, EE,
CIS model) 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, JE 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 | Reading on digital
Adjustment Location : TCB board (see page 14)
SW Tracking Adjustment
(E3, EA, MY, SP, HK, JE, IA, CIS model)
Setting :
Band : SW
AM FF signal
generator VTVM
Modulation : 400Hz
30% modulation SPEAKER terminal
AM ANTENNA terminal
Procedure :
Adjust for maximum reading on VTVM
Adjustment
| Set frequency part
SW
© 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)