DOWNLOAD Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual ↓ Size: 1.08 MB | Pages: 22 in PDF or view online for FREE

Model
ICF-M770L ICF-M770S ICF-M770SL
Pages
22
Size
1.08 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-m770l-icf-m770s-icf-m770sl.pdf
Date

Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual ▷ View online

ICF-M770L/M770S/M770SL
11
11
R29
C52
R33
Q11
Q12
C55
JW2
C46
C47
C45
C48
R32
D9
C57
C41
C42
C43
CF1
C38
JW3
R28
C37
C36
JW4
JC15
C33
C32
C58
C35
R27
JW6
JW10
JC7
R17
C24
D6
C25
JW16
JW21
C56
C64
C40
C62
R25
R23
R24
C44
R21
C28
C27
D7
R18
C66
R31
JW22
BPF1
C1
R20
JW5
JW19
JC11
JW7
JW8
L16
R7
JC10
R14
C59
JC13
JC14
C10
R3
L1
L2
R1
C4
R2
C5
C3
Q1
R34
Q2
JW17
R13
L9
R11
C63
RV2
Q8
R22
C29
JW15
L6
C30
C54
R8
JW13
C50
C7
JW20
R15
R202
R203
C204
C202
C207
R201
D201
D202
D203
D204
C205
D205
D206
C206
R30
C8
JW11
C51
IC1
CF2
CF3
Q10
T1
C61
CF4
Q9
RV1
L12
L13
L14
L3
JW18
JC5
R6
D1(1/2)
JW1
C11
D5
D8
R5
JW14
L15
R10
C6
C12
C73
JW12
Q3
Q6
R12
C21
C22
C20
C67
JC3
JC2
JC4
JC8
JC1
Q5
C19
C16
L8
R16
L11
R9
Q4
J301
J201
Q201
T202
C203
R19
Q7
C18
L10
C T 3
C2
C17
C14
C15
D1(2/2)
C65
C34
D2(1/2)
D2(2/2)
ANT1
TP
TP
JW9
C13
SP1
CT1
CT2
JC6
C23
L5
L7
CT4
330
2.2
47k
2SC4081
2SC4081
0.022
0.01
0.047
0.22
22
25V
4.7k
DAN202U
0.01
4.7
50V
4.7
50V
0.022
450KHz
0.01
2.2k
100p
0.1
22
10V
0.22
100p
4.7
25V
47
100k
1000p
HVU202A
5p
47p
100p
0.01
220
10V
47k
1k
4.7k
0.01
22k
10p
1000p
HVU202A
100k
0.022
100
0.01
1k
2.2k
1M
10p
15p
4.7k
4.7k
5p
100
0.01
1000p
2SK238
470
DTA144TUA
1M
1M
100p
10k
2SC4098
330
2p
0.01
1000
10V
10k
0.01
0.01
10k
47
2.2k
2200
16V
100p
0.022
100
1SS355
1SS355
1SS355
1SS355
0.01
1N4002
1N4002
0.01
1k
100
10V
470
16V
CXA1019S
10.7MHz
10.7MHz
DTC144TUA
0.01
10.7MHz
2SA1576A
50k
4.7k
SVC347
100p
1PS226
1SS356
1k
1k
5p
47p
2p
DTC144TUA
2SC4081
0.022
0.022
DTC144TUA
22k
100k
2SC2001
220
16V
3.3k
2SA1576A
0.01
50p
47p
330p
68p
SVC347
100p
0.01
SVC347
SVC347
(ANT)
(VT)
470p
10p
33p
10p
8
FM OSC
RF GND
7
9
AM OSC
10
AC DETEC
6
VT
SCAN TUNE
5
11
BEEP
12
GND
14
15
13
UCOM DC
6V COM
VCC
4
LW=L MW=L SW=H
3
FM=H SW.MW.LW=L
2
MUTE
1
UCOM DC
6V COM
AC DETEC
SP
GND
G
O
I
4
5
3
1
2
FM
/AM
IF OUT
FE
GND
FM
RF IN
NC
AM
RF IN
FM
RF
REG
OUT
FM
OSC
AFC
AM
OSC
VOL
NF
FM
DISCRI
GND
GND
GND
GND
AF
OUT
VCC
RIPPLE
FILTER
AF
IN
DET
OUT
AFC
AGC
IF
GND
AFC
AGC
M
ETER
NC
FM
IF IN
IF IN
AM
FM
/AM
BAND
SELECT
4
5
3
1
2
1
3
2
4
3
2
1
3
2
1
1
3
2
4
BATT DC
6V COM
AC DETEC
BATT -
BATT +
FM/AM FRONT-END
AGC,AF AMP
FM/AM IF AMP,DET,
TONE
Q11,12
SWITCH
AM IFT
BAND SELECT
SWITCH
BUFFER
FM VCO
MUTING
SWITCH
VOL
FM
RF
FM
RF
FM
OSC
SW RF
S
SW
SWITCH
L5-2
L5-1
FERRITE-ROD
ANTENNA
FERRITE-ROD
ANTENNA
MW
L5-1
L5-2
SELECT SWITCH
MW/LW OSC
MW/LW
SWITCH
MW/LW
SWITCH
SELECT SWITCH
FM/(SW/MW/LW)BAND
C15
390p
6800p
(M770L)
(M770L)
C16
15p
5p
SW/MW OSC
SW SWITCH
(M770L)
R12
10k
3.3k
C21
390p
100p
(M770S)
(M770SL)
(M770S)
(M770SL)
C22
68p
330p
(M770L)
(M770L)
(M
770L)
(M770SL)
(M
770L)
(M770L)
(M770L)
(M
770L)
(M770L)
(M770S)
(M770L)
(M770S)
(M770SL)
(M770L)
(M770L)
(M770L)
Q4
2SC4098
2SC4555
(M770L)
MW/LW SWITCH
SW SWITCH
Q4
15p
C19
(M770S)
(M770SL)
POWER
TRANSFORMER
DRY BATTERY
SIZE"D"
(IEC DESIGNATION R20)
4PCS. 6V
DETECT
AC
SW.MW.LW=H
BAND FM=L
(M770S/M770SL)
ANTENNA
FM/SW
(M
770L/M
770SL)
(M770S/M770SL)
(M770S/M770SL)
(M770S/M770SL)
(M770S/M770SL)
SW BAND
330p
(M770S/M770SL)
(M770S/M770SL)
(M
770S/M
770SL)
(M770S/M770SL)
(M770S/M770SL)
(M770S/M770SL)
(M770S/M770SL)
(M770S/M770SL)
TONE CONTROL
(M770S/M770SL)
FM/(SW/MW/LW)
(M770S)
CT2
10p
50p (M770L/M770SL)
(M770L)
LW
FERRITE-ROD
ANTENNA
MW/LW
(M770SL)
10µH
22µH
220µH
47µH
47µH
220µH
47µH
38µH
~
AC IN
5-4.
SCHEMATIC  DIAGRAM  – MAIN/JACK/POWER/INLET Boards –
 See page 9 for IC Block Diagram.
The components identified by mark 
0
 or dotted
line with mark 
0
 are critical for safety.
Replace only with part number specified.
(Page 13)
ICF-M770L/M770S/M770SL
12
12
E C B
Q111
R157
R159
C147
C143
C144
R156
E C B
Q106
R158
R153
C145
D103
K
A
R177
C104
Q109
B C E
R105
D101
AK
C106
R104
Q102
B C E
Q101
B C E
R103
C140
Q108
B C E
R109
C141
JC107
JC105
R102
R163
R162
R179
R197
R198
R178
R199
R101
C152
Q103
B C E
R136
R174
C115
R137
R164
C118
Q110
B C E
R152
Q104
B C E
R139
C117
C116
R142
R143
C150
R108
R138
R160
R134
R118
R135
R140
C148
R151
R150
Q105
B C E
C142
C132
C133
R141
JC103
C135
C134
C128
R144
C136
C149
R148
R154
Q107
B C E
R149
R155
C138
C137
C139
R196
R195
R194
R193
R192
R191
R190
R189
R188
R187
R186
R185
R184
R183
R182
R181
R180
R111
R107
C108
R161
R120
D106
K
A
C113
R121
R124
R122
R123
R125
R126
R127
R128
R129
R130
R131
R133
R132
C124
C123
C122
C121
C130
R169
R171
R170
C109
R168
R175
R172
R167
R113
R147
JC106
R110
R106
R166
R165
R176
R173
AK
D102
IC101
IC103
IC102
IC104
S101
S102
S103
S104
S105
S107
S108
D105
D104
JW131
S114
JW127
JW128
JW130
JW129
S115
L102
C129
+
C146
+
T101
S111
L103
C151
+
C105
+
S113
15
1
JW119
JW120
JW115
JW114
JW113
JW121
JW122
JW123
JW124
JW125
JW126
JW132
JW133
JW134
L101
JW111
JW112
JW109
JW110
JW108
JW107
JW106
JW105
S117
S119
S118
S116
JW117
JW116
S109
S120
JW103
JW102
JW101
JW104
S106
JW135
LCD101
LIQUID CRYSTAL DISPLAY
KEY BOARD
(11)
11
1-684-570-
5
4
1
3
A
MAIN
BOARD
TIME SET
ON/OFF
S110
SLEEP
STANDBY
LIGHT
S112
SCAN
1
14
15
28
29
42
43
56
4 3
1 2
R116
R117
R114
R115
M770S/
M770SL
M770L/
M770S
(M770SL)
(M770L)
1
17
TUNE/
TIME
SET
6
OPERATION
7
5
4
3
2
1
BAND
PRESET TUNING
STATION    SELECT/     PRESET
D104, 105
(LCD BACK LIGHT)
T101
4 3
1 2
HOLD
HOLD       OFF
A
B
C
D
E
F
G
H
I
1
2
3
4
5
6
7
8
R112
X101
CLOCK
mb/CLOCK (M770S/M770SL)
(M770L)
5-5.
PRINTED  WIRING  BOARD  – KEY Board –
 See page 9 for Circuit Boards Location.
D101
I-4
D102
I-7
D103
I-6
D104
D-7
D105
D-7
D106
D-3
IC101
I-5
IC102
B-3
IC103
D-3
IC104
D-4
Q101
I-4
Q102
I-4
Q103
G-5
Q104
F-4
Q105
E-5
Q106
I-6
Q107
E-7
Q108
I-3
Q109
I-4
Q110
F-3
Q111
I-6
• Semiconductor
Location
Ref. No.
Location
(Page 10)
ICF-M770L/M770S/M770SL
13
13
5-6.
SCHEMATIC  DIAGRAM  – KEY Board –
 See page 14 for Waveforms.
LCD101
R120
R121
R122
R123
R124
R125
R126
R127
R128
R129
R130
R131
R132
R133
C121
C122
C123
C124
C130
C134
C135
C136
C137
R144
JW133
JW134
C138
C139
R180
R181
R182
R183
R184
R185
R186
R187
R188
R189
R190
R191
R192
R193
R194
R195
R196
C141
C115
Q103
Q106
Q111
C151
L103
C140
C143
R157
R158
C145
R159
C146
C147
R153
L102
R177
JW130
C148
JW124
JW125
C152
D104
D105
R148
R149
R154
R155
JW131
C142
C116 R139
R101
R102
C129
R136
R137
R152
JW129
R135
JW126
R151
S105
S104
S108
S116
S117
S118
S119
S106
S107
S103
JW110
R170
R138
D106
JW108
R171
R169
R176
R166
JW115
R163
JW128
JW127
JW104
JW119
JW116
R109
C113
R103
R104
C109
C108
R110
R111
R106
R107
JW105
JW135
R118
IC103
IC102
JC106
D101
R105
JC103
JW132
R160
R150
R108
JW123
JC105
JC107
D102
R168
JW103
JW106
JW107
JW102
JW111
JW113
R113
R161
R165
R167
JW109
R162
JW114
R147
JW101
JW112
R175
R164
R174
R173
R156
JW120
C106
C105
C104
R198
R197
R178
R179
R172
R199
R134
JW117
Q108
Q105
C144
T101
Q110
Q104
L101
X101
Q107
C149
D103
R116
R117
R114
R115
R112
S120
IC101
Q109
Q101
Q102
S114
S109
S102
S101
S110
S112
S113
S115
R142
R140
R143
C117
C118
C132
C150
JW122
R141
C133
C128
IC104
S111
2.2k
10k
10k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
2.2k
1k
470p
470p
470p
470p
470p
27p
22p
0.1
0.1
10k
0.01
0.1
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
100k
0.01
0.0047
DTC144EUA
2SC4081
2SC4081
10
16V
100p
0.22
100k
100k
0.1
47k
10
10V
0.1
22
10k
0.01
0.022
TOL-31CSGAKAA
-KS01
TOL-31CSGAKAA
-KS01
680
680
680
680
1000p
0.33
10k
100k
1k
1000
6.3V
1M
4.7k
47k
10k
470
10k
10
1SS355
10k
10k
10k
10k
10k
47k
0.1
1k
4.7k
0.1
0.1
100k
100k
1M
1M
1k
S-80842ANNP
S-80836ANNP
1SS355
1k
100
47k
47
1SS355
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
1k
100p
10 16V
0.01
1k
1k
1k
1k
10k
1k
10k
DTC144TUA
2SC4098
10p
2SC4081
2SC4081
3.3mH
75KHz
2SC4081
1
UDZ-TE17-13
100k
100k
100k
100k
4.7k
S-81230SG-QB-T1
2SA1576A
2SB970
DTC144TUA
10k
100k
2.2k
1000p
470p
100p
47p
0.1
1
-036-1A7
COM0
COM1
COM2
COM3
LCD0
LCD1
LCD2
LCD3
LCD4
LCD5
LCD6
LCD7
CO
M0
C
OM
1
COM2
COM
3
LCD0
LCD1
LCD
2
L
CD3
LCD4
LCD5
LCD
6
LCD7
KS0
POWER
KS1
KS2
KS3
KS4
KR0
KR1
KR2
KR3
GND
EO
REG0
VDD
REG1
INITIAL2
INITIAL1
VDET2
BEEP
CEDET
LCD14
LCD13
LCD12
LCD11
LCD10
LCD9
LCD8
LCD7
LCD6
LCD5
LCD4
LCD3
LCD2
LCD1
LCD0
COM3
COM2
COM1
COM0
LIQUID CRYSTAL DISPLAY
8
FM OSC
RF GND
7
9
AM OSC
10
AC DETEC
6
VT
SCAN TUNE
5
11
BEEP
12
GND
14
15
13
UCOM DC
6V COM
VCC
4
LW=L MW=L SW=H
3
FM=H SW.MW.LW=L
2
MUTE
1
GND
OUT
IN
SW.MW.LW=H
BAND FM=L
SELECT SWITCH
FM/(SW/MW/LW)BAND
FM VCO
BUFFER
AC
DETECT
DC/DC
CONVERTER
Q104,110
LOW-PASS
FILTER
10k
4.7k
(M770L)
AC DET
TUNE
LIGHT
HOLD
VCOL
VCOH
XOUT
XIN
REGLCD0
CAPLCD0
CAPLCD1
REGLCD1
SYSTEM CONTROLLER,
LIQUID CRYSTAL
LED DRIVE
(LCD BACK LIGHT)
D104,105
DC/DC
CONVERTER
Q106,111
BPF
MUTE
AM/
(FM/TV)
VDET1
(M770L)
(M770SL)
HOLD
OFF
HOLD
GND
NC
OUT
IN
VOLTAGE
DETECT
VOLTAGE
DETECT
GND
NC
OUT
IN
NC
NC
+3V REGULATOR
B+ SWITCH
B+ SWITCH
CONTROL SWITCH
POWER ON/OFF
OPERATION
LIGHT
5
4
3
2
1
7
6
BAND
S108
S102
S103
S104
S106
S105
S107
mb/CLOCK
SLEEP
SCAN
STANDBY
ON/OFF
STANDBY
TIME SET
S116
S117
S118
S119
TUNE/
TIME SET
(M770S/M770SL)
(M770L/M770S)
(MW/LW)/SW
DISPLAY DRIVER,
KEY CONTROL
STATION     SELECT/          PRESET
PRESET TUNING
(M770S/M770SL)
CLOCK (M770L)
(M770S/M770SL)
µPD17072GB
100µH
220µH
(Page 11)
ICF-M770L/M770S/M770SL
14
14
• Waveforms
– KEY Board –
1
Q106 (Base), Q111 (Collector)
3
IC104 
wf
 (XOUT)
250 mVp-p
380 ns
5.6 Vp-p
380 ns
1.7 Vp-p
13.3 
µ
s
5-7.
IC  PIN  FUNCTION  DESCRIPTION
2
Q106 (Collector)
 KEY BOARD  IC104  
µ
PD17027GB-036-1A7
Pin No.
Pin Name
I/O
Description
1
KS0
O
Key source signal output
2
MUTE
O
Muting on/off control signal output    “L”: muting on
3
BPF
O
Band selection signal output    “L”: SW/MW/LW, “H”: FM
Used for the ICF-M770S/770SL (ICF-M770L: Not used)
4
(MW/LW)/SW
O
Band selection signal output    “L”: MW/LW, “H”: SW
5
POWER
O
Power on/off control signal output for the tuner section    “H”: radio power on
6 to 9
KS1 to KS4
O
Key source signal output
10 to 13
KR0 to KR3
I
Key return signal input
14
TUNED
I
Tuning detection signal input    “L”: tuned
15
AC DET
I
AC voltage detection signal input    “L”: AC detected
16
LIGHT
O
LED drive signal output of the liquid crystal display back light    “H”: LED on
17
HOLD
O
HOLD switch input terminal    “L”: hold on
18
GND
Ground terminal
19
EO
O
PLL frequency synthesizer charge pump output
20
VCOL
I
SW/MW/LW VCO input terminal
21
VCOH
I
FM VCO input terminal
22
REG0
O
Voltage regulator output terminal for the PLL 
23
VDD
Power supply terminal (+3V)
24
XOUT
O
System clock output terminal (75 kHz)
25
XIN
I
System clock input terminal (75 kHz)
26
REG1
O
Voltage regulator output terminal for the oscillator circuit
27
REGLCD0
Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
28
CAPLCD0
Connection terminal of doubler circuit capacitor
29
CAPLCD1
Connection terminal of doubler circuit capacitor
30
REGLCD1
Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display
35 to 47
LCD0 to LCD12
O
Segment drive signal output to the liquid crystal display
48, 49
LCD13, LCD14
O
Segment drive signal output to the liquid crystal display    Not used
50
VDET1
I
Voltage detection signal input    “L”: 2.5V or less
51
CEDET
I
Voltage detection signal input    “L”: 2.5V or less
52
BEEP
O
Beep sound drive signal output
53
VDET2
I
Voltage detection signal input    “L”: 2.9V or less
54
INITIAL1
I
Model setting input terminal    “L”: ICF-M770L, “H”: ICF-M770S/M770SL
55
INITIAL2
I
Model setting input terminal    “L”: ICF-M770L/M770S, “H”: ICF-M770SL
56
AM/(FM/TV)
O
Band selection signal output    “L”: FM, “H”: SW/MW/LW
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)  
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