Icom IC-A24, Service Manual

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11 - 1
SECTION 11 VOLTAGE DIAGRAM
*; Refer to “PARTS LIST.”
UNR9213J
Q16
*IC12
6
5
7
0.001 C162
R36 15K
0.
1
C149
1k R139
0.001 C33
*R82
0.1
C146
0.001 C170
CR-747
X1
*D5
220P
C159
100P C166
KEY
S17
0.001 C142
0.001 C603 0.001 C173
0.
1
C29
SML-A12M
T
DS
3
R13
1.2K
100P C621
MA2S111
D1
0.47
C140
0.001
C6
1k
R576
0.001
C618
2.2K
R567
10 MSVA
C135
R559
1M
MA2S077
D18
0.001
C155
*C107
*R77
470P
C614
R98
4.7K
*R65
KEY
S12
*R72
*R64
*C102
220P
C157
KEY
S3
KEY
S20
*R95
KEY
S9
220P
C607
XC6202P502PR
IC3
I O
G
2SC4211
Q2
1k R588
KEY
S10
0.
1
C9
0.1
C145
0.001 C164
1M
R145
R14
3.3K
KEY
S6
0
R154
0.001 C180
1k
R136
SML-A12M
T
DS
2
1k
R135
1k R140
0.001 C161
*IC12
2
3
1
*C123
0.01
C609
3.3K
R586
0.001 C613
*R558
TP76N00
R130
SML-512MW
DS6
100K
R153
100K R137
12K
R562
UNR9210J
Q5
*C116
*D16
1k R572
0.001 C174
0.001 C175
R20
10K
1k R570
*C109
R22 4.7K
0.01
C148
2SC4617
Q3
*R87
KEY
S15
NTCG16
R151
0 R143
1k R141
0.001 C602
*C115
*R85
47P
C615
R112
2.2M
*R94
R560
1M
0.001 C31
M A2S111
D10
1k
R593
*R83
*C108
*C600
*C110
MA2S111
D8
SML-512MW
DS5
*R81
0.001 C169
0.001
C181
R16
100K
0.47
C138
AXK6S40545P
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
R15
3.9K
0.001
C160
*C125
SML-512M
W
DS
9
1M
R147
0.001 C35
1k
R594
KEY
S18
*R60
*C101
0.
1
C616
*R70
*C121
KEY
S4
SML-512M
W
DS8
R26 180
*R93
0.001 C27
UNR9213J
Q8
0.01
C150
2SB1132
Q1
15K
R30
*IC13
2
3
1
100K R152
1M
R146
KEY
S2
1k R138
*C111
0.001 C605
*C103
0.01
C151
0 R155
*D6
BD5245G
IC2
1 VOUT
2 VDD
3 GND 4
NC
5
CT
220P
C158
*R68
MA8051
D19
R107
1M
KEY
S7
100P C623
6P C7
12K
R561
0.001 C20
*R62
0.001 C22
KEY
S19
10K
R569
*IC13
V+
8
GND
4
*C112
1k R571
*D17
100P C622
*R96
UNR9110J
Q6
*Q15
1
2
3 4
5
6
*R76
0.001
C23
0.01 C25 47
C26
*Q13
S-812C50BMC
IC16
1 GND
2 VIN
3 VOUT 4
NC
5
ON/OFF
R5
100K
R108
1M
0.47
C139
100P
C167
33K
R568
MA6S121
D2
0.001
C144
R12
1.2K
0.001 C604
S-24CS64A0 I
IC7
1 A0
2 A1
3 A2
4 VSS 5
SDA
6
SCL
7
WP
8
VCC
*C105
*IC12
9
10
8
0.1
C2
*R75
1k R590
100P C184
*IC11
V+
8
GND
4
MA8082
D7
*R86
0.01
C608
1M
R1
*C113
KEY
S14
*R90
1k R592
0.001 C611
0.001 C179
0.001 C617
*R74
*R71
*C122
*R69
R11
1.2K
R21
10K
0.1
C143
*R88
100P C172 0.001 C182
*IC1
1
P30/TO0
2
P31/TI00
3
P32/TI01
4
P33/TO50/TI50
5
P34/TO51/TI51
6
P20/RXD0/SI3
7
P21/TXD0/SO3
8
P22/SCK3
9
P23/SI1
10
P24/SO1
11
P25/SCK1
12
P00/INTP0
13
P01/INTP1
14
P02/INTP2
15
P03/INTP3/ADTRG
16
P04/INTP4
17
P05/INTP5/BUZ/PCL
18
VPP
19
XT2
20
XT1
21
VSS1
22
VDD1
23
X2
24
X1
25
RESET
26
AVREF0
27
P10/ANI0
28
P11/ANI1
29
P12/ANI2
30
P13/ANI3
31
P14/ANI4
32
P15/ANI5
33
P16/ANI6
34
P17/ANI7
35
ANI
8
36
ANI
9
37
AVSS0
38
P120/AO0
39
AVREF1
40
CAPH
41
CAPL
42
VLCDC
43
VLC0
44
VLC1
45
VLC2
46
COM0
47
COM1
48
COM2
49
COM3
50
SCOM0
51
S0
52
S1
53
S2
54
S3
55
S4
56
S5
57
S6
58
S7
59
S8
60
S9
61
S10
62
S11
63
S12
64
S13
65
S14
66
S15
67
S16
68
S17
69
S18
70
S19
71
S20
72
S21
73
S22
74
S23
75
P90/S24
76
P91/S25
77
P92/S26
78
P93/S27
79
P94/S28
80
P95/S29
81
P96/S30
82
P97/S31
83
P80/S32
84
P81/S33
85
P82/S34
86
P83/S35
87
P84/S26
88
P85/S37
89
P86/S38
90
P87/S39
91
VSS0
92
VDD0
93
P60
94
P61
95
P62
96
P63
97
P64
98
P65
99
P66
100
P67
101
P40
102
P41
103
P42
104
P43
105
P44
106
P45
107
P46
108
P47
109
P50
110
P51
111
P52
112
P53
113
P54
114
P55
115
P56
116
P57
117
P70/TO4
118
P71/TI
4
119
P
72/TO52
120
P73/TI52
*IC13
6
5
7
2SB1182
Q4
100K R564
100K
R565
*IC11
6
5
7
47
C34
0.001 C168
R25
180
2.2M
R2
KEY
S13
0.001
C163
*IC14
6
5
7
*IC14
V+
8
GND
4
100P C612
*R73
KEY
S11
0.001
C156
SML-512MW
DS
7
*R84
0.01
C24
*C118
0.001
C620
*R91
1M
R148
12K
R563
*C117
0.001 C171
100P C165
*R80
0
R595
*C120
SML-512M
W
DS10
KEY
S5
A0280 DS1
1
CO
M1
2
CO
M2
3
CO
M3
4
CO
M4
5
SEG1
6
SEG2
7
SEG3
8
SEG4
9
SEG5
10
SEG6
11
SEG7
12
SEG8
13
SEG9
14
SEG10
15
SEG11
16
SEG12
17
SEG13
18
SEG14
19
SEG15
20
SEG16
21
SEG17
22
SEG18
23
SEG19
24
SEG20
25
SEG21
26
SEG22
27
SEG23
28
SEG24
29
SEG25
30
SEG26
31
SEG27
32
SEG28
33
SEG29
34
SEG30
35
SEG31
36
SEG32
37
SEG33
38
SEG34
39
SEG35
40
SEG36
0.001
C43
*R66
0.001 C177
XP1501
Q7
1 2 3 4
5
*R67
0.
1
C154
470P C610
UNR9213J
Q9
*R63
*R78
0.001 C178
TP70N00E2015F
S1
E
UP
DN
1k R578
*IC11
2
3
1
100K R133
*C104
KEY
S21
*C119
0.001 C606
0.001 C176
*R89
*IC12
13
12
14
22 MSVB
2
C28
*R61
0.47
C1
R17
10K
*C106
*R79
1k R591
0.
1
C147
0.001 C44
KEY
S16
*IC14
2
3
1
MA2S111
D11
R18 10K
*IC12
V+
4
GND
11
33P
C8
*C114
0
R566
0.001 C619
EM-140
MC1
KEY
S8
0.001 C183
1k
R589
COM1 COM2 COM3 COM4 SEG1 SEG2 SEG5 SEG
6
SEG3 SEG4 SEG
7
SEG13 SEG10 SEG16 SEG11 SEG8 SEG9 SEG15 SEG14 SEG12 SEG17 SEG23 SEG32 SEG29 SEG33 SEG36 SEG28 SEG20 SEG31 SEG26 SEG21 SEG18 SEG19 SEG25 SEG34 SEG30 SEG27 SEG35 SEG24 SEG22
KR0
KR1
KR2
KR3
KR4
DCC
EDATA
COM4 COM3 COM2 COM1
UNLK
D A1STB
D A2STB
JACKDET
KS2
KS1
KS0
IN I
LIGHT C
EXTREG
C
VORD
VORD
VORD
VORON
CSHIFT
INTPTT
VORDET
VORDET
CLONE
CLONE
JACKDET
R SSI
RSSI
RFDETV
RFDETV
RFDETV
VIN
VIN
VIN
SCK
CLONE
TXC
INTPTT
LIGHT
VORON
VORON
VORON
VORDET
CHGIH
RFSTB
PTT
PCON
SEG34
SEG23
SEG33
SEG21
SEG30
SEG32
SEG36
SEG16
SEG27
SEG14
SEG28
SEG13
SEG35
SEG15
SEG20
SEG12
SEG24
SEG18
SEG31
SEG17
SEG22
SEG19
SEG26
SEG25
SEG29
SEG11
SEG1 SEG2 SEG6 SEG3 SEG4 SEG7 SEG8 SEG9
SEG10
SEG5
KR3 KR4 KR0 KR1 KR2
CHGC CHGI
H
CHGVH PCK TXC
LIGHT
VORS
VORS
VORC
VORC
SDATA
SCK
DCC
DCC
CLOUT
CLIN
THERM C
DICK DIUD
VOL_IN
INTMIC
INTMIC
ALC5V
ALC5V
D ETO
DETO
VORS VORC
LVIN
ECK
PSTB RFSTB OE EMBI
KS3 KS2 KS1 KS0
LIGHTC
PDATA
INI
UNLK
D
A2STB
SDAT A
DA1ST B
OE
INTMIC
EXTREG C
CHGV H
CHGC
HV
HV
BEEP
BEEP
VCC
PDATA
PCK
PSTB
BPCPI
SBATT
SBATT
SBATT
PTT
CPU5V
CPU5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
DCIN
DCIN
DCIN
KS3
T:5.0
R:5.0
T:6.7
R:7.2
T:5.0
R:5.0
T:5.0
R:5.0
T:4.9
R:4.9
VOR CH:4. 9
VCC: 7.2 V
Freq.: 127.050 MHz
RSSI: 60 dBu
Measured by: Tester (Zin=more than 50 k
Ω
/V)
VOLTAGE LINE
Explanatory notes
TX LINE
• LOGIC UNIT
• LOGIC UNIT