7
WM-FX481
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz <621kHz>
CT1
1,400kHz <1,395kHz>
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display
Reading on digtal voltmeter
Confirmation
87.5MHz
Standard value : 6.5V or less
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
98MHz
Confirmation
108MHz
TUNER SECTION
AM Section
BAND : AM
FM Section
BAND : FM
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
RV2
1,000kHz <999kHz>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequency display
Reading on digtal
voltmeter
Confirmation
530kHz
Standard value : 3V or less
L7
1,710kHz
Adjustment value : 10.0V<9.0V>
<1,602kHz>
Standard value : 9.9-10.1V
<8.9 – 9.1V>
Adjustment Location :
Main board (See page 8)
0 dB = 1
µ
V
•
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
16
Ω
level meter
Frequency Coverage Adjustment
Setting :
J301
i
9E,CH
5E,6E
JR3
C40
R207
FB301
FB201
FB101
C35
R21
D5
R2
C9
C16
PWOUT
PWOUT
(R)
(L)
STID
(COM)
PWOUT
GND
FM
IN
MAIN BOARD (SIDE B)
FM RF signal
generator
33.75kHz frequency
deviation by 1kHz signal.
Output level :
as low as possible
TP
(FM IN)
0.01
µ
F
no mark : 10kHz step
< > : 9kHz step
D704
R709
C706
L402
C
C303
S709
ENTER
PB3
GND
VT
TUNER
VCC
S713
AM
TP (VT)
TP (GND)
digital voltmeter
(DC range)
MAIN BOARD (SIDE B)
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