Schematic Diagram - Key Board - Sony ICF-M770L Service Manual
Fm/mw/lw pll synthesized
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Also See for ICF-M770L:
- Operating instructions (2 pages) ,
- Operating instructions manual (22 pages)
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5-6.
SCHEMATIC DIAGRAM – KEY Board – •
14
UCOM DC
15
6V COM
13
VCC
12
GND
JC106
11
BEEP
4
LW=L MW=L SW=H
3
FM=H SW.MW.LW=L
CLOCK (M770L)
mb/CLOCK
S105
S101
1
BAND FM=L
SW.MW.LW=H
(Page 11)
2
MUTE
S115
STANDBY
TIME SET
R179
1k
5
SCAN TUNE
6
VT
10
AC DETEC
JW125
C115
0.0047
9
AM OSC
8
FM OSC
C141
0.01
7
RF GND
See page 14 for Waveforms.
Q101
NC
NC
2SB970
B+ SWITCH
+3V REGULATOR
R103
R104
S-81230SG-QB-T1
1k
4.7k
Q109
2SA1576A
Q102
B+ SWITCH
DTC144TUA
JW120
POWER ON/OFF
C104
CONTROL SWITCH
0.01
C105
10 16V
R105
1k
R199
1k
R178
1k
R198
1k
R197
1k
S108
S107
S106
S105
S104
S103
S102
7
6
5
4
3
2
1
PRESET TUNING
S111
STATION
SELECT/
PRESET
S110
(M770S/M770SL)
SLEEP
S112
S113
SCAN
STANDBY
ON/OFF
R163
R164
10k
JW115
JW128
10k
S104
S103
BAND
S108
S107
TUNE/
R162
TIME SET
10k
S119
S118
S117
S116
JW114
R147
R172
10k
10k
JW101
S116
S117
R175
R170
10k
10k
JW112
JW109
R173
R174
10k
10k
JW129
C129
R136
R137
1000
1M
4.7k
6.3V
R102
R101
1k
100k
Q103
DTC144EUA
AC
DETECT
R152
47k
JW126
R108
R150
R151
47
47k
470
JW124
Q108
Q105
DTC144TUA
2SC4098
FM/(SW/MW/LW)BAND
FM VCO
C148
C142
SELECT SWITCH
BUFFER
0.01
1000p
JW123
D102
R156
L103
1SS355
1k
100µH
Q106,111
R157
100k
DC/DC
C151
C140
C143
10
100p
0.22
CONVERTER
16V
T101
R158
DC/DC
100k
CONVERTER
C144
Q106
Q111
R159
10p
2SC4081
2SC4081
47k
GND
NC
VOLTAGE
VOLTAGE
DETECT
OUT
IN
DETECT
IC101
IC102
IC103
S-80836ANNP
S-80842ANNP
C106
100p
D101
1SS355
JW119
JW116
R106
R107
1M
1M
C113
0.1
S109
OPERATION
R135
10k
R161
10k
R115
100k
S114
LIGHT
JW104
JW127
JW113
S102
R176
10k
R165
10k
S106
R166
10k
R167
D106
10k
1SS355
R120
2.2k
R121
10k
R122
10k
R123
2.2k
S118
R113
R124
2.2k
10k
R125
2.2k
R168
JW103
JW106
R126
2.2k
10k
JW102
JW107
R127
2.2k
S119
R128
2.2k
R169
10k
JW111
R129
2.2k
R130
2.2k
R131
2.2k
JW110
R132
2.2k
R133
1k
JW108
R171
JW132
10k
L101
R160
R138
R134
3.3mH
100
10
10k
C116 R139
0.33
10k
C117
1000p
R141
10k
(M770L)
4.7k
(M770S/M770SL)
Q110
Q104
2SC4081
2SC4081
C118
Q104,110
470p
LOW-PASS
FILTER
JW130
L102
R148
R154
R155
220µH
680
680
680
R177
JC105
JC107
10k
R153
22
D104
TOL-31CSGAKAA
-KS01
D103
2SC4081
UDZ-TE17-13
LED DRIVE
C146
C145
C147
C152
10
0.1
0.1
0.022
10V
13
13
GND
NC
OUT
IN
R110
100k
R111
100k
S120
C108
C109
HOLD
0.1
0.1
OFF
R109
47k
HOLD
R112
4.7k
LCD101
LIQUID CRYSTAL DISPLAY
R114
R116
R117
100k
100k
100k
R185
100k
KS0
LCD7
MUTE
LCD6
BPF
LCD5
(MW/LW)/SW
LCD4
POWER
LCD3
KS1
LCD2
KS2
SYSTEM CONTROLLER,
LCD1
LIQUID CRYSTAL
KS3
LCD0
DISPLAY DRIVER,
KS4
COM3
KEY CONTROL
KR0
IC104
COM2
µPD17072GB
KR1
-036-1A7
COM1
KR2
COM0
KR3
REGLCD1
TUNE
CAPLCD1
AC DET
CAPLCD0
C138
0.01
JC103
JW134
C150
R142
47p
10k
C132
R143
R140
100p
2.2k
100k
R149
JW131
680
D105
D104,105
TOL-31CSGAKAA
(LCD BACK LIGHT)
-KS01
Q107
C149
1
ICF-M770L/M770S/M770SL
LCD7
LCD6
R186
100k
LCD5
R187
100k
LCD4
R188
100k
LCD3
R189
100k
R190
100k
LCD2
R191
100k
LCD1
R192
100k
LCD0
R193
100k
COM3
R194
100k
COM2
R195
100k
COM1
R196
100k
COM0
C139
0.1
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