Sony WM-FX673 Service Manual page 13

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TUNER SECTION
[AM]
Setting:
function : RADIO
BAND button : AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM]
Setting:
function : RADIO
BAND button : FM
FM RF signal
generator
0.01 µ F
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
TE
L 13942296513
MAIN board
TP2 (VT)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
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0 dB=1 µV
Put the lead-wire
antenna close to
level meter
the set.
32 Ω
set
2 REMOTE jack (J701)
TP1 (FM IN)
level meter
32 Ω
set
2 REMOTE jack (J701)
digital voltmeter
+
–
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8
Adjust for a maximum reading on level meter
T2
Adjustment Part Frequency Display Reading on Digital Voltmeter
T1
Confirmation
+
–
Adjust for a maximum reading on level meter
L5
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2
Confirmation
FM VCO Adjustment
Setting:
+
–
Carrier frequency : 98 MHz
Modulation
Q Q
3 6 7 1 3
Output level
Procedure:
1. Connect the frequency counter to pin !™ of IC2 as shown the
figure below.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 19 kHz reading on the frequency counter.
Specification: 18.95 kHz to 19.05 kHz
IC2 pin !™
Adjustment Location:
– MAIN Board (Side B) –
TP1
(FM IN)
1
12
u163
.
– 13 –
2 9 9 4 2 8
AM IF ADJUSTMENT
450 kHz
AM VCO VOLTAGE ADJUSTMENT
531 kHz
1602 kHz
AM TRACKING ADJUSTMENT
621 kHz
FM VCO VOLTAGE ADJUSTMENT
87.5 MHz
108 MHz Less than 10 V
FM RF SSG
0.001 µ F
: no modulation
1 5 0 5 8 2 9 9 4
: 0.1 V (100 dB)
frequency counter
1 µ F
+
+
33 k Ω
–
L2 FM VCO Voltage Adjustment
RV601 Tape Speed Adjustment
TP2
(VT)
IC2
T2 AM IF Adjustment
m
T1 AM VCO Voltage
Adjustment
co
RV1 FM VCO Adjustment
L5 AM Tracking Adjustment
9 9
1.5 ± 0.1 V
8.5 ± 1 V
3.4 ± 0.1 V
TP (FM IN)
2 8 9 9