Read Sony ICF-M350V Service Manual online
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• Waveforms
1
IC101
ea
(XIN)
500 mV/DIV, 5 µs/DIV
1 Vp-p
13
µ
s
2
IC101
wg
(AM LOCAL IN) (Band: AM)
200 mV/DIV, 500 ns/DIV
520 mVp-p
1
µ
s
3
IC101
wh
(FM LOCAL IN) (Band: FM)
20 mV/DIV, 10 ns/DIV
65 mVp-p
10 ns
4
IC101
wj
(TV LOCAL IN) (Band: TV H)
20 mV/DIV, 10 ns/DIV
51 mVp-p
4.8 ns
5
Q106 collector
2 V/DIV, 200 ns/DIV
2 V/DIV, 200 ns/DIV
5 Vp-p
400 ns
• IC Block Diagrams
IC1
CXA1019S
IC201
TA2030FN (EL)
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
FE GND
N.C
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
MIX OUT
OSC OUT
FM OSC
TV OSC
VCC
FM RF
TV RF
GND
TV IN
TV BY
RF GND
FM BY
FM IN
MODE SW
PW SW
IF OUT
16 15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TV
OSC
BUFFER
MIX
FM RF
AMP
IF
AMP
POWER/MODE
SWITCH
TV RF
AMP
BUFFER
FM
OSC
2-4.
IC PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
I/O
Description
1 to 8
LCD10 to LCD3
O
Segment drive signal output to the liquid crystal display (LCD101)
9, 10
LCD2, LCD1
O
Segment drive signal output to the liquid crystal display Not used (open)
11
—
—
Not used (open)
12 to14
COM3 to COM1
O
Common drive signal output to the liquid crystal display (LCD101)
15
VSS3
—
Ground terminal
16, 17
CAP1, CAP2
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
18
VSS2
—
Ground terminal
19
MUTE
O
Muting on/off control signal output “L”: muting on
20
BEEP
O
Buzzer sound signal output terminal
21
NC
—
Not used (fixed at “L”)
22
VDD
—
Power supply terminal (+3V)
23
TV LOCAL IN
I
TV (7 to 13CH, weather) VCO input terminal
24
FM LOCAL IN
I
FM/TV (2 to 6CH) VCO input terminal
25
AM LOCAL IN
I
AM VCO input terminal
26
VSS (GND)
—
Ground terminal
27
PD OUT
O
PLL error output terminal
28
—
—
Not used (open)
29
CE
I
System reset signal input from the reset signal generator (IC102) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
30
XOUT
O
System clock output terminal (75kHz)
31
XIN
I
System clock input terminal (75kHz)
32
CAP
—
Terminal for regulator circuit capacitor connection to attain stable drive voltage of the oscillator
33
—
—
Not used (open)
34
TV H
O
TV band select signal output terminal Not used (open)
35
TV L
O
TV band select signal output terminal Not used (open)
36
MW/FM. TV
I/O
Battery check signal input from battery check (IC51) and AM or FM/TV band select signal output
“L”: FM/TV, “H”: AM
“L”: FM/TV, “H”: AM
37
—
—
Not used (open)
38
RADIO POWER
ON/OFF
O
Power on/off control signal output terminal “L”: power off, “H”: power on
39
TV/MW. FM
O
FM/TV (2 to 6CH) or TV (7 to 13CH, weather) band select signal output
“L”: FM/TV (2 to 6CH), “H”: TV (7 to 13CH, weather)
“L”: FM/TV (2 to 6CH), “H”: TV (7 to 13CH, weather)
40
INIT
O
Initialize signal output to KEY RET0 (pin rk)
41
—
—
Not used (open)
42 to 44
KEY SCAN2 to
KEY SCAN0
O
Key scan signal output to the key matrix
45 to 48
KEY RET3 to
KEY RET0
I
Key return signal input from the key matrix
49, 50
—
—
Not used (fixed at “L”)
51 to 56
LCD16 to LCD11
O
Segment drive signal output to the liquid crystal display (LCD101)
•
KEY BOARD IC101 µPD1724GB-618-1A7 (SYSTEM CONTROLLER, LCD DRIVER, KEY CONTROL)
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