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TUNER SECTION
Precautions in Repairing
Note. 1 : The adjustment should be performed in the publication.
(MW n FM n SW)
Note. 2 : As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.
r
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
set
AM RF signal
generator
loop antenna A
loop antenna B
Carrier frequency : 999kHz (at
9kHz step) or
1,050kHz (at
10kHz step)
Modulation : 400Hz 30% modulation
Procedure :
1. Set loop antenna A so that the loop antenna B input level becomes
55dBµ/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 RF stereo signal
generator
75
Ω
coaxial
FM ANTENNA terminal
set
Carrier frequency : 98MHz
Modulation : 1kHz, 75kHz (100%)
Output level : 0.018mV (25dB )
µ
Procedure :
1. Tune the set to 98MHz.
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.
Set frequency
Adjustment
part
Reading on digital
voltmeter
SW
5.95MHz T2 1.2Vdc
17.9MHz CV2 8.5Vdc
Adjustment Location : TCB board (see page 14)
SW Tracking Adjustment
(E3,EA,MY,SP,HK,TW model)
Setting :
Band : SW
+
–
AM RF signal
generator
AM ANTENNA terminal
SPEAKER terminal
Modulation : 400Hz
30% modulation
set
Level mete
Procedure :
Adjust for maximum reading on Level mater.
Set frequency
Adjustment
part
SW
7MHz T1
17MHz CV1
r
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)
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