Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual ▷ View online
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
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 –
– 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)
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)
15
ICF-M770L/M770S/M770SL
6-1. CABINET (FRONT) SECTION
SECTION 6
EXPLODED VIEWS
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• Accessories are given in the last of the elec-
trical parts list.
• When “NET, SPEAKER (Ref. 3)” is being
replaced, “EMBLEM (5-A), SONY (Ref. 5)”
needs to be replaced also.
needs to be replaced also.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-237-047-01 PANEL (M770SL)
1
3-237-047-11 PANEL (M770S)
1
3-237-047-21 PANEL (M770L)
2
3-237-052-01 PLATE, TRANSPARENT
3
3-237-061-01 NET, SPEAKER
4
3-237-057-01 KNOB (HOLD)
5
4-925-334-41 EMBLEM (5-A), SONY
6
3-237-062-01 SHEET, SPEAKER
7
3-237-048-01 BUTTON (PRESET)
8
3-014-055-01 FOOT, RUBBER
9
3-013-190-01 SPRING (JOG), RING
10
3-237-049-01 KNOB (JOG)
11
3-237-050-01 KNOB (CONTROL) (VOL)
12
3-237-050-11 KNOB (CONTROL) (TONE)
13
3-237-021-01 CABINET (FRONT)
SP1
1-825-130-11 SPEAKER (12cm)
#1
7-685-105-14 TAPPING +P 2X8 NON-SLIT
#2
7-685-903-21 SCREW +PTPWH 3X8 (TYPE2)
#3
7-685-549-14 SCREW +BTP3X14 TYPE2 N-S
8
9
10
11
12
13
1
4
2
3
5
6
7
8
#2
#3
#3
#1
cabinet (rear) section
chassis section
SP1
The components identified by
mark 0 or dotted line with mark
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
16
ICF-M770L/M770S/M770SL
6-2. CABINET (REAR) SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
3-237-053-01 LID, BATTERY CASE
52
3-939-499-01 CUSHION (BATT)
53
3-237-064-01 TERMINAL (-), BATTERY
* 54
1-684-567-11 INLET BOARD
* 55
1-684-569-11 POWER BOARD
56
3-228-709-01 PLATE, ANTENNA CONTACT
* 57
1-684-568-11 JACK BOARD
58
3-237-056-01 SHAFT (HANDLE)
59
3-237-336-01 SPRING (HANDLE) (R)
60
3-237-054-01 HANDLE
61
3-237-065-01 TERMINAL (+/-), BATTERY
62
3-237-022-01 CABINET (REAR)
63
3-237-063-01 TERMINAL (+), BATTERY
64
3-244-251-01 CUSHION (A)
65
3-880-474-01 CUSHION, 15X5X0.3
ANT1
1-501-321-51 ANTENNA, TELESCOPIC
0 T202
1-435-614-11 TRANSFORMER, POWER
#4
7-682-149-13 SCREW +P 3X10
#5
7-685-102-19 SCREW +P 2X4 TYPE2 NON-SLIT
#6
7-685-134-19 SCREW +P 2.6X8 TYPE2 NON-SLIT
51
52
53
54
65
55
63
64
64
61
62
60
58
59
59
58
56
57
not
supplied
supplied
#6
#4
#6
#5
#5
#6
not
supplied
supplied
ANT1
T202
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
line with mark 0 are critical for safety.
Replace only with part number specified.
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