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ICF-M770L ICF-M770S ICF-M770SL
Pages
22
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1.08 MB
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Service Manual
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Device
Audio
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icf-m770l-icf-m770s-icf-m770sl.pdf
Date

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

ICF-M770L/M770S/M770SL
9
9
Note on Printed Wiring Board:
X
: parts extracted from the component side.
Y
: parts extracted from the conductor side.
W
: indicates side identified with part number.
f
: internal component.
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
5-2.
NOTE  FOR  PRINTED  WIRING  BOARD  AND  SCHEMATIC  DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
C
: panel designation.
• IC Block Diagram
IC1
CXA1019S
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
A
: B+ Line.
H
: adjustment for repair.
• Power voltage is dc 6 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
no-signal (detuned) conditions.
no mark : FM
(
) : SW
[
] : MW
〈〈
 
〉〉
: LW
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: MW/LW
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
• Circuit Boards Location
jack board
main board
key board
inlet board
power board
ICF-M770L/M770S/M770SL
10
10
A
K/A
K
D5
K
A
K
D9
EC
B
Q12
EC
B
Q11
C55
C63
R30
C45
C57
EC
B
Q10
C38
C37
R28
R29
C34
C43
C52
C32
C58
R19
C28
C27
D7
K
A
C61
R21
C29
R18
C25
C24
D6
K
A
R17
JC7
R22
R27
JC15
R15
R20
C50
C36
C65
EC
B
Q8
Q2
BC
E
R34
C3
R3
R7
EC
B
Q5
D8
A
K
R5
C1
R10
C4
Q1
GD
S
R1
R2
C5
C6
C10
C7
JC14
JC13
C12
C20
1A
K
2A
D1
C15
R11
R13
R12
JC8
JC1
JC3
EC
B
Q4
JC11
C56
R31
C66
C64
JC10
EC
B
Q7
R25
R16
C67
C40
Q9
BC
E
R23
R24
C44
C46
C47
C30
C19
C21
C22
1A
K
2A
D2
R8
R14
C23
C11
C18
EC
B
Q3
R9
JW1
C54
+
1
5
JW2
L6
C48
+
C42 
+
C51
+
C41
+
CF1
CF4
C35
+
L14
JW5
JW4
CT4
L13
L12
BPF1
L16
L1
C8
+
C33
+
L15
JW16
L2
JW17
JW12
JW18
CT1
L7
L3
JW15
JW14
JW13
CT2
L10
RV1
JW20
JW19
JW21
L8
L9
L11
JW22
JW6
JW9
JW7
1
15
JW11
JW8
C62
+
JW3
T1
CF3
CF2
IC1
MAIN BOARD
(11)
11
1-684-571-
15
1
16
30
R33
R32
JC5
(M770L)
JC6
(M770L)
R6
EC
B
Q6
C13
C73
(M770L)
(M770L)
(M770S/M770SL)
C59
(M770L)
(M770SL)
M770S/
M770SL
M770S/
M770SL
M770S/
M770SL
VOL
RV2
TONE
JW10
JC4
JC2
C2
C17
C14
C16
(M770L)
CT3
M770S/
M770SL
M770S/
M770SL
(M770L)
A
KEY
BOARD
TP
(VT)
1
2
3
(M770S/M770SL)
TP
(ANT)
ANT1
L5
MW/LW FERRITE-ROD
ANTENNA
A
B
C
D
E
F
G
H
I
1
2
3
4
5
6
7
8
9
10
I
1
4
INLET BOARD
(11)
11
1-684-567-
D201
AK
D202
AK
D203
AK
D204
A
R202
C207
R201
R203
C206
C205
C202
Q201
1
5
C204
+
1
3
D206
D205
C203
+
1
4
J201
JACK BOARD
(11)
11
1-684-568-
T202
POWER
TRANSFORMER
POWER BOARD
(11)
11
1-684-569-
K
v
SP1
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
4PCS. 6V
1
3
J301
AC IN
11
12
13
14
15
L5-2
LW FERRITE-ROD
ANTENNA
L5-1
MW FERRITE-ROD
ANTENNA
(M770L)
(M770S/M770SL)
5-3.
PRINTED  WIRING  BOARDS  – MAIN/JACK/POWER/INLET Boards –
 See page 9 for Circuit Boards Location.
D1
E-3
D2
D-2
D5
C-10
D6
C-5
D7
D-5
D8
B-6
D9
C-9
D201
C-11
D202
C-11
D203
D-11
D204
D-11
D205
D-13
D206
D-13
IC1
D-7
• Semiconductor Location
Ref. No.
Location
Ref. No.
Location
Q1
B-3
Q2
C-4
Q3
C-2
Q4
F-3
Q5
B-4
Q6
D-2
Q7
E-2
Q8
D-5
Q9
G-2
Q10
B-9
Q11
D-9
Q12
C-9
Q201
D-12
(Page 12)
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)
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