Sony WM-FX822 Service Manual page 10

QQ
3 7 63 1515 0
AM SECTION
Setting :
FUNCTION switch : RADIO
BAND switch : AM
AM TUNING VOLTAGE ADJUSTMENT
IC1
TE
L 13942296513
Adjustment Part Location Diagram :
[TUNER BOARD]
www
.
VCO ADJUSTMENT
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Digital
voltmeter
+
–
TP
(VT)
AM IF ADJUSTMENT
T2
TP IC2
(GND)
x ao
y
i
RV1
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8
AM IF ADJUSTMENT, AM TRACKING ADJUSTMENT
AM RF SSG
Modulation : 400 Hz, 22.5 kHz dev. (30%)
Output level : as low as possible.
(AC : 0.5–5V range)
16
set
REMOTE jack
• Repeat the procedures in each adjustment several times, and
the tracking adjustment should be finally done by the
trimmer capacitors.
Adjust for a maximum reading on VTVM.
T2
Q Q
3 6 7 1 3
AM TUNING VOLTAGE ADJUSTMENT
Adjust for a 1.20 ± 0.03 Vdc reading on Digital voltmeter.
T1
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L6
CT1
FM IF ADJUSTMENT
L5
u163
.
AM TRACKING ADJUSTMENT
L6
CT1
— 10 —
2 9 9 4 2 8
Put the lead-wire
antenna close to
the set.
VTVM
AM IF ADJUSTMENT
1395 kHz
1 5 0 5 8 2 9 9 4
531 kHz
621 kHz
1395 kHz
TP
(ANT)
AM TUNING
VOLTAGE
ADJUSTMENT
T1
m
co
9 9
2 8 9 9