8
WM-GX410
TUNER SECTION 0 dB = 1
µ
V
AM Section
FUNCTION switch: AM
FM Section
FUNCTION switch: FM
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
RV2
999 kHz <1,000kHz>
AM RF SSG
set
30% amplitude modulation by
400Hz signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
16
Ω
i
headphone jack (J401)
level meter
FM RF SSG
set
30% amplitude
modulation by
1kHz signal.
Deviation : 75kHz
Output level : as low
as possible
0.01
µ
F
16
Ω
i
headphone jack (J401)
main board
TAP66
level meter
(side B)
no mark : 9kHz step
< > : 10kHz step
TP333
(LPF)
TP8
TP3
Q308
C43
R313
Q307
R3
C71
R10
C17
R6
9
R13
R312
C16
C8
C12
R18
Q3
RV1
C31
9
R22
[MAIN BOARD] (SIDE A)
TP (LPF)
digital voltmeter
(DC range)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequency
Reading on digtal
voltmeter
L7
<530kHz>
1.1
±
0.4V
531kHz
Confirmation
<1,710kHz>
5.0
±
0.6V
1,602kHz
AM TRACKING ADJUSTMENT
Adjustment for a maximum reading on level meter.
L3
<620 kHz> 621 kHz
CT1
<1,400 kHz> 1,404 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Frequency display
Reading on digtal voltmeter
Confirmation
87.5 MHz
Standard value : 4.2
±
0.5 V
Confirmation
108 MHz
9.1
±
0.5 V
FM TRACKING ADJUSTMENT
Adjustment for a maximum reading on level meter.
L4
87.5 MHz
Confirmation
108 MHz
±
Adjustment Location: Main board (See page 9)
