Diagrams; Explanation Of Ic Terminals - Sony WM-GX400 Service Manual

Q Q
3 7 6 3 1 5 1 5 0
0 dB = 1 µV
TUNER SECTION
AM Section
FUNCTION switch: AM
Put the lead-wire
AM RF SSG
level meter
antenna close to
the set.
16 Ω
set
30% amplitude modulation by
400Hz signal.
i headphone jack (J301)
Output level : as low as possible
FM Section
FUNCTION switch: FM
FM RF SSG
level meter
16 Ω
0.01 µ F
set
30% amplitude
modulation by
i headphone jack (J301)
1kHz signal.
main board (side B)
Deviation : ± 75kHz
TP2
Output level : as low
as possible
T E
L 1 3 9 4 2 2 9 6 5 1 3
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
no mark : 9kHz step
< > : 10kHz step
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.
L7 621 kHz <620kHz>
CT1 1,404 kHz <1,400kHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 96.0 MHz
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FM VCO Adjustment
Procedure:
[MAIN BOARD] (SIDE B)
FM RF SSG
TP2
0.01 µ F
(ANT)
Carrier frequency : 96MHz
Deviation : none
: 562 µ V (55dB)
Output level
1. Connect the resistor 10kΩ 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
[MAIN BOARD] (SIDE B)
TP1
(IC1 7 pin)
+
10k Ω
Adjustment Location:
[MAIN BOARD] (SIDE B)
RV2: AM IF Adjustment
L4: FM Tracking Adjustment
RV1: FM VCO Adjustment
L7:
AM Tracking Adjustment
CT1:
x a o u 1 6 3
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8

4-1. EXPLANATION OF IC TERMINALS

IC701 (SYSTEM CONTROL/LCD DRIVE) LC72349W-9A27
Pin No. Pin name
1 XOUT
2 TEST2
3 – 6 PA3 – 0
7 RADIO ON
8, 9 PB2, 1
10 MOTOR BRK
11 PUSH
12 PAUSE
13 VERSION
14 BAND
15 SD
16 COMP
17 TU MODE
18 TUNING-A
19 AMP ON
20 BEEP
21 BACK UP
22 BATT
23 FACTORY
24 VSS
25 MUTE
frequency
Q Q
counter 26 MOTOR CTL
3 7 6 3 1
1 µ F
27 N/R SW
+
28 REC
29 TAPE
30 X2
31 TUNING-B
32 PRE CTL
33 – 44 S12 – S1
45 – 48 COM4 – 1
49 – 52 DBR4 – 1
53 XRESET
54 TU
55 VDD
56 FM IN
57 AM IN
58 VSS
59 E0
60 AIN
61 AOUT
62 AGND
63 TEST1
64 XIN
.
7 7
SECTION 4

DIAGRAMS

2 4
9 9 8
I/O Description
O Connected to 75kHz Crystal oscillator
I For Test
I Control key inputs
O Radio on/off control signal output
O Key source signal outputs
O Motor brake control signal output
I Tuning dial (S701) common switch signal input
I Pause switch (S303) signal input
I Destination select signal input
O Band select signal output
I SD input
I COMP input
I Tuning mode select switch (S707) signal input
I Tuning dial (S701) A switch signal input
O Power amplifier on/off control signal output
O Beep signal output
I Back-up voltage detection signal input
I Battery voltage detection signal input
— Not used Pull-up
— Power supply ground terminal
O Mute signal output
O Motor control signal output
5 1 5 0 8 9 2 4 9
O N/R switch signal output
I REC detection signal input
I Tape on/off detection signal input
I Tape speed select switch (S706) signal input
I Tuning dial (S701) B switch signal input
— Not used
O LCD driver segment output terminal
O LCD driver common output terminal
I For LCD power supply booster
I System reset signal input
O Output for tuning voltage generator
— Power supply terminal
I FM VCO input
I AM VCO input
— Power supply ground terminal
O Main charge pump output
I LPF amplifier input
O LPF amplifier output
— LPF amplifier ground
I For test
I Connected to 75kHz Crystal oscillator
m
c o
WM-GX400
2
9 9
8 2 9 9