WM-GX400
7
7
SECTION 4
DIAGRAMS
Pin No.
Pin name
I/O
Description
1
XOUT
O
Connected to 75kHz Crystal oscillator
2
TEST2
I
For Test
3 – 6
PA3 – 0
I
Control key inputs
7
RADIO ON
O
Radio on/off control signal output
8, 9
PB2, 1
O
Key source signal outputs
10
MOTOR BRK
O
Motor brake control signal output
11
PUSH
I
Tuning dial (S701) common switch signal input
12
PAUSE
I
Pause switch (S303) signal input
13
VERSION
I
Destination select signal input
14
BAND
O
Band select signal output
15
SD
I
SD input
16
COMP
I
COMP input
17
TU MODE
I
Tuning mode select switch (S707) signal input
18
TUNING-A
I
Tuning dial (S701) A switch signal input
19
AMP ON
O
Power amplifier on/off control signal output
20
BEEP
O
Beep signal output
21
BACK UP
I
Back-up voltage detection signal input
22
BATT
I
Battery voltage detection signal input
23
FACTORY
—
Not used Pull-up
24
VSS
—
Power supply ground terminal
25
MUTE
O
Mute signal output
26
MOTOR CTL
O
Motor control signal output
27
N/R SW
O
N/R switch signal output
28
REC
I
REC detection signal input
29
TAPE
I
Tape on/off detection signal input
30
X2
I
Tape speed select switch (S706) signal input
31
TUNING-B
I
Tuning dial (S701) B switch signal input
32
PRE CTL
—
Not used
33 – 44
S12 – S1
O
LCD driver segment output terminal
45 – 48
COM4 – 1
O
LCD driver common output terminal
49 – 52
DBR4 – 1
I
For LCD power supply booster
53
XRESET
I
System reset signal input
54
TU
O
Output for tuning voltage generator
55
VDD
—
Power supply terminal
56
FM IN
I
FM VCO input
57
AM IN
I
AM VCO input
58
VSS
—
Power supply ground terminal
59
E0
O
Main charge pump output
60
AIN
I
LPF amplifier input
61
AOUT
O
LPF amplifier output
62
AGND
—
LPF amplifier ground
63
TEST1
I
For test
64
XIN
I
Connected to 75kHz Crystal oscillator
4-1. EXPLANATION OF IC TERMINALS
IC701 (SYSTEM CONTROL/LCD DRIVE) LC72349W-9A27
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 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
621 kHz <620kHz>
1,404 kHz <1,400kHz>
Adjust for a maximum reading on level meter.
96.0 MHz
FM VCO Adjustment
Procedure:
1. Connect the resistor 10k
Ω
between TP1 and TP332.
2. Connect the frequency counter to TP1 (IC1
7
pin).
3. Set FUNCTION switch to FM.
4. Tune the set in 96MHz.
5. Adjust RV1 so that the reading on the frequency counter be-
comes 76 kHz.
Specifications: 75 kHz - 77 kHz
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 (J301)
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 (J301)
main board
TP2
level meter
(side B)
D
3
C15
D4
C28
FB201
FB101
D2
R16
FB301
R15
17
TP2
C
47
C3
TP368
TP369
TP370
0.01
µ
F
FM RF SSG
TP2
(ANT)
Carrier frequency : 96MHz
Deviation
: none
Output level
: 562
µ
V (55dB)
[MAIN BOARD] (SIDE B)
Adjustment Location:
[MAIN BOARD] (SIDE B)
IC1
C1
D
C28
L6
L2
C10
C8
C12
C9
C20
C23
C21
C18
R18
R11
R20
R17
TP1
1
10
11
20
21
30
31
40
TP333
C34
TP331
TP332
-4
+
+
10k
Ω
TP1
(IC1
7
pin)
1
µ
F
frequency
counter
[MAIN BOARD] (SIDE B)
L7:
CT1:
RV2: AM IF Adjustment
L4: FM Tracking Adjustment
RV1: FM VCO Adjustment
AM Tracking Adjustment
no mark : 9kHz step
< > : 10kHz step
w w w . x i a o y u 1 6 3 . c o m
Q Q 3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
