![background image](http://html.mh-extra.com/html/icom/ic-a23/ic-a23_service-manual_612408033.webp)
C10
0.001
C11
0.001
C12
0.001
C13
0.001
C18
0.001
DS1
TTR3845UPFDCN
SEG29
SEG28
SEG27
SEG26
SEG31
SEG25
SEG24
SEG23
SEG22
SEG39
SEG38
SEG37
SEG36
SEG21
SEG20
SEG19
SEG18
SEG30
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG1
1
SEG10
SEG9
SEG8
SEG7
SEG6
SEG1
SEG5
SEG4
SEG0
SEG3
SEG2
COM3
COM2
COM1
COM0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
S29
S28
S27
S26
S31
S25
S24
S23
S22
S39
S38
S37
S36
S21
S20
S19
S18
S30
S17
S16
S15
S14
S13
S12
S1
1
S10
S9
S8
S7
S6
S1
S5
S4
S0
S3
S2
COM3
COM2
COM1
COM0
VL1
100
C1
99
C2
98
VL2
97
VL3
96
COM0
95
COM1
94
COM2
93
COM3
92
AVSS
91
VREF
90
VCC
89
SEG0
88
SEG1
87
SEG2
86
SEG3
85
SEG4
84
SEG5
83
SEG6
82
SEG7
81
SEG8
80
SEG9
79
SEG10
78
SEG11
77
SEG12
76
SEG12
SEG11
SEG10
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG1
SEG2
SEG0
SEG13
SEG14
SEG15
SEG16
SEG17
P30/SEG18
P31/SEG19
P32/SEG20
P33/SEG21
P34/SEG22
P35/SEG23
P36/SEG24
P37/SEG25
P01/SEG27
P02/SEG28
P03/SEG29
P04/SEG30
P05/SEG31
P06/SEG32
P07/SEG33
P10/SEG34
P12/SEG36
P13/SEG37
P1
1/SEG35
P00/SEG26
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
CHGC
ECK
ECK
PCON
PCON
SEG36
SEG37
P67/AN7
P66/AN6
P65/AN5
P64/AN4
P63/SCLK22/AN3
P62/SCLK21/AN2
P61/SOUT2/AN1
P60/SIN2/AN0
P57/ADT/DA2
P56/DA1
P55/CNTR1
P54/CNTR0
P53/R
TP1
P52/R
TP0
P51/PWM1
P50/PWM0
P47/SRDY1
P46/SLCK1
P45/TXD
P44/RXD
P43/T
OUR
P42/INT2
P41/INT1
P40
P77
10
11
12
13
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
SBA
TT
P
D
ATA
PCK
PSTB
BEEP
VORS
DICK
KS3
KS2
KS1
KS0
KS3
KS2
KS1
KS0
LIGHT
BPCPI
CLOUT
CLIN
DIUD
VORC
POWER
PTT
JACKDET
14
1
2
3
45
6
7
8
IC7
HN58X2432TI
A0
A1
A2
VSS
VCC
VCC
TEST
SCL
SDA
C23
0.001
C27
0.001
C24
0.022
R19
1M
C135
10
C8
27p
C44
0.001
R6
10k
C7
24p
C47
470p
C91
0.0047
R48
100k
R58
100k
R59
100k
C93
1
C100
0.001
R52
120k
R109
100k
C99
0.001
C90
10
C92
0.001
R46
TBPS1R104K475H5Q
R45 33k
C89
0.001
R69
18k
C116
0.001
C117
0.1
C123
0.001
R71
18k
R70
180k
C118
0.0047
R72
4.7k
C98
0.1
SP—
VCCA
MIC
MIC REF
AGC
ANA IN
ANA OUT
NC
PLAYL
PLAYE
RECLED
XCLK
REC
VCCD
IC15 ISD1420SI
A0
A1
A2
A3
A4
A5
NC
NC
A6
A7
NC
VSSD
VSSA
SP+
NC
IN2
NF2
NF1
NC
IN1
NC
OUT1
GND
NC
ALC
VCC
NC
OUT2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R44
15k
R42
39
IC9 BA3308F
C136
10
C137
1
C88
15
R43
100k
C127
0.47
R47
1M
D15
MA8036L
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
C601
0.22
C65
0.001
C66
0.001
C59
0.001
R113
120k
+5V
+5V
HV
HV
VREC
SCK
JACKDET
TO
RF UNIT
J3
PTT
VOLCK
RFSTB
VOLDATA
OE
UNLK
TXC
SBAT
CHGC
VCC
SDATA
PCK
PSTB
PDATA
EXTMIC
DASTB
LIGHT
EXTPTT
VORDET
VORDET
VORDET
VORON
RFDET
BEEP
MOD
RSSI
+5V
HV
SCK
JACKDET
PTT
PTT
VOLCK
RFSTB
VOLDATA
OE
UNLK
TXC
TXC
SBAT
CHGC
VCC
VCC
SDATA
PCK
PSTB
PDATA
EXTMIC
EXTMIC
DASTB
LIGHT
EXTPTT
EXTPTT
RFDET
BEEP
RSSI
D11
MA2S111
Q5
UN9210
C35
0.001
R21
10k
C31
0.001
C34
47
C33
0.001
Q4
2SB1182
3
2
1
5
4
Q7
XP1501
+5V
1
2
3
VOUT
VIN
GUD
NC
NC
D10
MA2S111
C29
0.1
C28
22
R22
4.7k
R20
10k
IC16
S-81250SG-QD
Q6
UN9213
R98
1M
4
5
1
2
3
4
5
OUT
VDD
VSS
CD
NC
C25
0.01
C26
47
R18
10k
C22
0.001
R17
10k
Q3
2SD2216
C20
0.001
C6
0.001
R16
100k
R5
100k
UNLK
CHGC
COM0
COM1
COM2
COM3
R2
100k
R3
100k
R4
100k
C138
0.1
C139
0.1
C140
10
R1
47k
C2
0.1
P76
P75
P74
P73
P72
P71
P70/INT0
RESET
XCIN
XCOUT
XIN
XOUT
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P17
P16
P15/SEG39
P14/SEG38
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
SEG38
SEG39
EDATA
VOLCK
SDATA
DASTB
VOLDATA
SCK
RFSTB
UNLK
UNLK
KR0
KR1
KR2
KR3
MASTB
RESET
RESET
DCC
DCC
KR4
OE
R30
22k
IC2
S-80945ALMP-DA9-T2
3
2
1
5
4
Q8
XP1201
BUSYLED
PTT
+5V
+5V
EXTPTT
INI
VCC
LIGHTC
LIGHTC
VORDET
D12
MA2S111
R25
180
C43
0.001
R27
1k
R26
180
R28
470
Q9
XP1201
3
2
1
5
4
C53
0.001
R110
33k
D14
MA2S111
Q10
2SB1462
R32
470
C51
0.001
C49
4.7
R35
10k
C50
0.047
R34
220k
C52
0.001
R33
10k
C19
0.001
R31
33k
D13
MA8051 H
C48
0.01
Q2
2SC4211
Q1
2SB1132
R14
3.3k
R11
390
R12
390
R13
390
C9
0.1
R15
3.9k
C104
1
C107
0.1
C111
3.3
C103
10
R74
220k
R73
4.7k
R75
56k
R76
33k
R79
6.8k
C105
10
R81
1.8k
C108
0.001
R80
150k
C109
0.001
C106
0.001
R77
220k
C110
0.1
R84
4.7k
C113
0.1
R87
TBPS1S333K460H5Q
R85
18k
C112
0.1
R83
220k
R78
4.7k
R91
39k
R88
33k
R82
4.7k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R64
4.7k
R63
15k
R62
220k
R61
47k
C102
470p
C115
0.1
C114
0.1
R66
220k
1
2
3
4
5
6
7
8
IC13 NJM2904V
C125
10
R68
270k
R67
10k
C119
0.001
R89
470
R90
100k
R95
22k
R93
470k
R94
820k
1
2
3
4
5
6
7
8
IC14 NJM2903V
C122
0.1
R112
2.2M
D17
MA2S111
R558
12k
VORS
VORD
Q13
2SC4211
C600
0.01
C121
0.01
R560
1M
(IC-A5 only)
VORC
R86
4.7k
5
6
7
8
D16
MA2S111
1
2
3
4
IC11 NJM2903V
R60
39k
C101
0.001
QS
QS
Q8
Q7
Q6
Q5
OE
VDD
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
STR
D
CLK
Q1
Q2
Q3
Q4
VSS
OE
OE
Q12 UN9211
IC-A23 only
R39
22k
C86
0.015
R40
100k
R41
47k
IC8 BU4094BCFV
MMUTE
SDATA
SCK
VORON
PLAYC
RECC
LIGHTC
MASTB
SDATA
SCK
VORON
PLAYC
RECC
MASTB
SDATA
SCK
VORON
VORON
+5V
MASTB
Q17
DTC144EE
Q16
DTB123EK
C87
0.0047
ALCC
6
5
4
3
2
1
C45
0.001
IC12 NJM2902V
+5V
KR0
KR1
KR2
KR3
KS3
KS2
KR4
INI
INI
KS1
KS0
R563
1M
R564
1M
D4
DA112
R562
1M
R561
1M
D3
DAP202U
D2
MA6S121
D1
MA2S111
VIN
VORD
RSSI
RFDET
THRMC
R101
1k
R104
1k
R103
1k
C4 0.1
C128 0.1
C5 0.001
C129 0.1
C130 0.1
C131 0.1
R100
1k
R102
1k
R108
1M
R107
1M
DICK
DIUD
S2
UP
S3
DWN
S4
SQL
S5
POWER
S9
CLR
S8
3
S7
2
S6
1
S10
4
S11
5
S12
6
S13
ANL
S17
BANK
S16
9
S15
8
S14
7
S18
ENT
S19
0
S20
MR
S21
F
C126
0.1
R9
100k
R111
100k
R10
100k
R7
10k
R8
100k
D7
MA8100 M
D8
MA2S111
D9
MA728
IC3
S-81350HG-KD
C42
0.001
R24
100k
R23
220k
D18
MA8051 H
R96
100k
C120
22
R559
100k
(IC-A5 only)
R65
220k
D3
DA113
IC1
M38267M8L-266GP
O
G
I
Q11
XP4315
R37
NTCCM16084LH
R38
100k
C37
0.001
R36
15k
VIN
CLOUT
CLOUT
CLIN
THERMC
+5V
1
5
10
15
20
40
21
25
30
35
BDET
C1
0.001
X1
5.039MHz
Q15
XP4315
DS4
LT1EP53A
DS3
LNJ310M6URA
DS2
LNJ310M6URA
DS9
LN1371G-
DS10
LN1371G-
DS8
LN1371G-
DS5
LN1371G-
DS6
LN1371G-
DS7
LN1371G-
J1
S1
CHASSIS
UP
E
ON
MC1
EM-140
W10
IC-A23 only
6
5
4
3
2
1
IC-A5 only
IC-A23 only
IC-A23 only
KS0
KS1
INI
LOGIC UNIT
5.0V
5.1V
T:5.0V
R:0.0V
5.0V
9.3V
9.6V in = 9.6V
12V in = 12V
9.6V in = 5.0V
12V in = 0V
T:0.0V
R:4.7V
5.0V
VOR CH: 5.0V
LEFT SIDE
RIGHT SIDE
SECTION 11
VOLTAGE DIAGRAM
11 - 1
11 - 1 LOGIC UNIT