12
WM-FX888
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T2
450 kHz
AM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
T1
531 kHz
1.5
±
0.1 V
Confirmation
1602 kHz
8.5
±
1 V
FM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
87.5 MHz
3.4
±
0.1 V
Confirmation
108 MHz
Less than 10 V
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
function
: RADIO
BAND button : AM
[FM]
Setting:
function
: RADIO
BAND button : FM
• Repeat the procedures in AM IF adjustment and AM tracking
adjustment for a maximum reading on level meter.
FM VCO Adjustment
Setting:
Procedure:
1. Connect the frequency counter to pin
qs
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
Adjustment Location:
0.001
µ
F
FM RF SSG
Carrier frequency : 98 MHz
Modulation
: no modulation
Output level
: 0.1 V (100 dB)
TP1 (FM IN)
+
–
digital voltmeter
TP2 (VT)
+
–
IC2 pin
qs
+
1
µ
F
frequency counter
33 k
Ω
– MAIN Board (Side B) –
TP1
(FM IN)
IC2
1
12
T2 AM IF Adjustment
T1 AM VT Voltage
Adjustment
L2 FM VT Voltage Adjustment
RV1 FM VT Adjustment
RV601 Tape Speed Adjustment
TP2
(VT)
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
16
Ω
i
jack (J701)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
i
jack (J701)
set
16
Ω
0.01
µ
F
TP1 (FM IN)
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TEL 13942296513 QQ 376315150 892498299
