Icom IC-M23 Service Manual page 24

SECTION 10. VOLTAGE DIAGRAM
• MAIN UNIT (1/2)
M3V
4
V+
GND
11
IC200
LMV324IPW
MC250
R270
EM6027P-46C33-G
1K
TX:2.98V
RX:0.00V
PTTSW
ATX
Q250
LDTC144EE
PTTIN
IC260
CD4066BPWR
1
I/O1
VDD
2
O/I1 CONT1
3
O/I2
CONT4
4
I/O2 I/O4
5
CONT2 O/I4
6
CONT3 O/I3
7
VSS I/O3
MICG
MICMS
DETMS
PTTM
C467
120P
R264
EXB28V104J R255
270K
1.45V
6
7
5
IC200
CP405
CP410
HV
C401
4.7
F
CP409
CP400
CP401
CP402
CP406
CP404
J251
1
2
S320 S323
S326
16/9 H/L D350
SCAN
KDS122
S321 S324 S327
CH/WX
UP FAV
S322
S328
DOWN
VOL/SQL
IC190
M62364FP
1 24
VIN1 VIN8
2 VOUT1 23
VOUT8
3 VOUT2 22
VOUT7
8 4 VIN2 21
VIN7
V+ 5 VDD 20
GND
GND 6 LD 19
DAST
RESET
4 7 CLK 18
VDAREF
8 DI 17
DO
R192
9 VIN3 16
IC365 VIN6
390
MCON 10 15
LMV358IPW VOUT3 VOUT6
11 14
VOUT4 VOUT5
12 13
VIN4 VIN5
C437
0.47
DET
C263
R276
22K 0.01
R277
100K
14
13
12
R272
R271 C265
11 DETIN
120K
24K 100P
10 DETO
9
R273
8
22K
R388
470K
1.45V
R203 R207 R377 R378 C378
220K 39K 82K 82K 0.0047
2
R379
R202
1
82K
100K
3
IC200
R376
100K
R413
4.7K
TX:0.00V
RX:3.70V
9
8
10
IC200
LMV324IPW
IC362
TPA0211DGN
8
VO- IN
7
GND
SHUTDOWN
6
SE/ BTL VDD
5
VO+ BYPASS
*MP22
CPU3V
R353
1K
Q350
R351
LDTC144TE
1K
10 - 1
CPU3V
VOLOUT
2.99V
R279
1.5K
91
92
93
94
95
96
PON 97
DETMS 98
LEDI-R 99
LEDI-G 100
101
PTTM
102
R213 C207
103
PTTIN
100K 0.1
104
ELOW 105
LOW 106
TXMS 107
16/9
13 108
CH/WX
14 109
12 UP 110
111
DOWN
112
IC200 FAV
VOL/SQL 113
SCAN 114
115
H/L
116
1.43V UNLK 117
R402
SWCTRL 118
39K
PWSW 119
CMODE 120
C436
R432
0.47
2.7K
Q230
RSQ035P03TR
AFV
BEEP
CP360
PS
1
2
3 Q231
KTC811U
4
R231
D356
330
L1SS400
R361
EXB28V102J
R230
330K
CPU3V
IC340
S-24C64CI-T8T1U3 IC341
NJU7704F03A
1 8
A0 VCC
2 7 VIN 5 1
A1 WP VDD CD
3 6 2
A2 SCL VSS
4 5 4 3
VSS SDA VOUT MR
DS246
TAK-35920
R242
EXB28V821J
Q240
LMUN5213DW1
4 3
5 2 LEDON:2.98V
6 1
60
VSS0 S9
59
VDD0 S8
58
P60 S7
57
P61 S6
56
P62 S5
55
P63 S4
54
P64 S3
53
P65 S2
52
P66 S1
51
P67 S0
50
P40 SCOM0
49
P41 COM3
48
P42
COM2
47
IC360
P43 COM1
46
UPD780318GC-513-9EB-A
P44 COM0
45
P45 VLC2
44
P46 VLC1
43
P47 VLC0
42
P50 VLCDC
41
P51 CAPL
40
P52 CAPH
39
P53 AVREF1
38
P120/AO0
P54
37
P55 AVSS0
36
P56 ANI9
35
P57 ANI8
34
P70/TO4 P17/ANI7
33
P71/TI4 P16/ANI6
32
P72/TO52 P15/ANI5
31
P73/TI52 P14/ANI4
TDEC
DASTB
SDATAO
X360
SCLK
CR-911
CPU3V
4.915MHz
1.76VP-P
*: Refer to the PARTS LIST for the value and name of component.
M3V
MOD
SEG9
SEG8
R373
SEG7
1M
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM2
COM1
COM0
ATIS
WDECV
DCV
NOISV
RSSIV
BATTV
R649
0