Icom IC-A23 Service Manual page 32
Air band fm transceiver
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Also See for IC-A23:
- Instruction manual (39 pages) ,
- Instruction manual (40 pages) ,
- Schematic diagrams (2 pages)
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D11
MA2S111
R37
NTCCM16084LH
R36
15k
R38
C37
Q5
CLOUT
100k
0.001
UN9210
VCC
H
5.0V
EXTMIC
+5V
HV
TXC
PTT
EXTPTT
VORDET
+5V
Q11
Q17
Q16
XP4315
DTC144EE
DTB123EK
6
5
4
C87
0.0047
1
2
3
R40
C86
R39
100k
R43
0.015
22k
100k
8
Q12 UN9211
NC
R41
9
IC-A23 only
IN2
47k
10
NF2
11
NF1
R42
12
NC
39
13
IN1
14
NC
IC8 BU4094BCFV
C88
9
8
15
IC9 BA3308F
QS
VSS
10
LIGHTC
7
QS
Q4
11
6
RECC
Q8
Q3
12
5
PLAYC
Q7
Q2
13
4
VORON
Q6
Q1
14
3
SCK
Q5
CLK
15
2
SDATA
D
OE
16
1
MASTB
STR
VDD
OE
C45
0.001
C101
R60
0.001
39k
R64
4.7k
R61
R62
1
8
47k
220k
2
7
3
6
R63
4
5
15k
D16
C102
MA2S111
IC11 NJM2903V
470p
IC12 NJM2902V
R73
R74
C103
220k
4.7k
10
1
14
2
13
3
12
4
11
R83
C112
5
10
220k
R75
0.1
6
9
56k
7
8
C111
R85
3.3
18k
R76
33k
C104
C107
R78
1
0.1
4.7k
R87
TBPS1S333K460H5Q
C106
R79
C108
C105
0.001
6.8k
0.001
10
R80
150k
0
R77
220k
C109
R81
R82
1.8k
0.001
4.7k
3 only
OE
JACKDET
SBAT
VOLCK
CHGC
RFSTB
TXC
SCK
SDATA
VOLDATA
VCC
UNLK
PTT
PCK
EXTPTT
PSTB
LIGHT
PDATA
DASTB
EXTMIC
+5V
C65
0.001
HV
C66
0.001
BEEP
RFDET
RSSI
VORDET
R46
C91
R48
TBPS1R104K475H5Q
0.0047
100k
C137
C136
1
10
5.0V
R45 33k
C90
C89
10
C100
C99
0.001
R58
R44
R59
0.001
0.001
100k
15k
100k
7
OUT2
6
NC
5
VCC
4
ALC
3
NC
C92
R47
2
C127
GND
D15
0.001
1
1M
0.47
OUT1
MA8036L
RECC
PLAYC
VORON
SCK
SDATA
MASTB
C125
R69
10
18k
C116
C117
0.001
0.1
R70
R71
IC13 NJM2904V
180k
18k
R65
220k
1
8
7
2
3
6
4
5
C118
R66
0.0047
220k
R67
R68
C114
10k
270k
C115
0.1
0.1
R72
4.7k
R89
470
R84
4.7k
C113
C119
0.1
0.001
R90
IC14 NJM2903V
100k
1
8
R86
2
4.7k
7
3
6
4
5
R95
R93
D17
470k
22k
MA2S111
C121
R91
0.01
39k
Q13
2SC4211
R88
R94
33k
820k
C122
R560
R558
C600
0.1
1M
12k
0.01
(IC-A5 only)
J1
1
40
OE
JACKDET
SBAT
VOLCK
CHGC
RFSTB
TXC
SCK
SDATA
5
VOLDATA
VCC
35
C59
0.001
UNLK
PTT
PCK
EXTPTT
PSTB
10
TO
LIGHT
RF UNIT
PDATA
30
J3
DASTB
EXTMIC
+5V
HV
15
VREC
25
VORDET
BEEP
RFDET
MOD
VORON
RSSI
20
21
R113
120k
C98
0.1
+5V
C93
R52
1
120k
IC15 ISD1420SI
15
14
SP—
SP+
16
13
VCCA
VSSA
C601
17
12
MIC
VSSD
18
11
0.22
MIC REF
NC
19
10
AGC
A7
20
9
R109
ANA IN
A6
21
8
100k
ANA OUT
NC
22
7
NC
NC
23
6
PLAYL
A5
24
5
PLAYE
A4
25
4
RECLED
A3
26
3
XCLK
A2
27
2
REC
A1
28
1
VCCD
A0
VORON
SCK
SDATA
MASTB
OE
Q15
XP4315
4
5
6
C123
0.001
IC-A23 only
3
2
1
VORON
VOR CH: 5.0V
C120
R96
22
100k
R559
100k
(IC-A5 only)
R112
2.2M
COMPLETE VIEW
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