Icom IC-A23 Service Manual page 31

SECTION 11 VOLTAGE DIAGRAM
11 - 1 LOGIC UNIT
DS1
TTR3845UPFDCN
C1
0.001
SEG12
R1 SEG11
47k SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
C2
COM3
0.1
COM2
COM1
COM0
R2 C140
10
100k
C139
R3
0.1
100k
R4 C138
100k 0.1
CHASSIS
R107
S1
1M
UP
E
ON
R108
1M
S2 S3
UP DWN
S6 S7
1 2
S10 S11
4 5
S14 S15
7 8
S18 S19
ENT 0
COMPLETE VIEW
76
SEG12
77
SEG11 P14/SEG38
78
SEG10 P15/SEG39
79
SEG9
80
SEG8
81
SEG7
82
SEG6
83
SEG5
84
SEG4
85
SEG3
86
SEG2
87 IC1
SEG1
88
SEG0 M38267M8L-266GP
89
VCC
90
VREF
91
AVSS
92
COM3
XCOUT
93
COM2
94
COM1 RESET
95
COM0
P70/INT0
96
VL3
97
VL2
98
C2
99
C1
100
VL1
C4 0.1
C5 0.001
C128 0.1
C129 0.1
C130 0.1
C131 0.1
R101
1k
R104
1k
R100
1k
R102 R103
1k
1k
R9
S5 100k
S4
SQL POWER C126
0.1
S8 S9
3 CLR
S12 S13
6 ANL
C10 C11 C12 C13
0.001 0.001 0.001 0.001
R564
S16 S17
1M
9 BANK
S20 S21 R563
MR F 1M
D1
MA2S111
R562
1M
D2
MA6S121
R561
1M
11 - 1
Q3
D7 D8
R17
2SD2216
C20 MA8100 M MA2S111
10k
R5 R16
0.001
100k 100k
C22
R18
0.001 10k
C6
0.001
IC3
12V in = 0V
S-81350HG-KD
9.6V in = 5.0V
5.1V
O I
G
C26 C25
0.01
47
IC2
S-80945ALMP-DA9-T2
R19 5.0V
C23
1M
0.001
C135
10
C24
0.022
50 SEG38
49 SEG39
Q6
48 UNLK
P16
47 EDATA
P17 UN9213
46 DASTB
P20
45 VOLCK
P21
44 VOLDATA
P22
R30
43 SCK
P23
22k
42 SDATA
P24
41 RFSTB
P25
40 MASTB
P26
39 OE
P27
38
VSS
37
XOUT
36
XIN
35
34
XCIN
33 RESET X1
32 DCC 5.039MHz
31 KR0
P71
30
KR1
P72
29 KR2 IC7
P73
28 KR3 R6
C7 C8 HN58X2432TI
P74
27 KR4 10k
24p 27p
P75
26
P76
C44
0.001
W10
KS0
KS1
KS2
KS3
R7
10k
BDET MC1
EM-140
R8
100k
C47
470p
R111
100k
+5V
R10 C19
100k 0.001
KR0
KR1 T:5.0V
R:0.0V
Q10
KR2 2SB1462
KR3
KR4 C50
0.047
C18
0.001
KS3
D4
DA112
INI
LOGIC UNIT
KS2
IC-A23 only IC-A5 only
KS1 KS1
D3 D3
DAP202U INI DA113
INI
KS0 KS0
12V in = 12V
9.6V in = 9.6V
9.3V
D9
MA728
C35
R23
R21
C31 0.001
10k 220k
0.001
IC16
Q4
S-81250SG-QD
R24
2SB1182
100k
5 4
Q7
XP1501
1 2 3
+5V
D10
MA2S111
C33 C34
47
0.001
R20
10k
R98 C27 C28
C29
1M 0.001
22 0.1
C42
0.001
R22
4.7k
R25 R26 R27
R28
180 180 1k
470
C43
DS4
0.001
LT1EP53A
DS2 DS3
LNJ310M6URA LNJ310M6URA
D12
5 4 5 4
MA2S111
Q8
Q9
XP1201
XP1201
1 2 3 1 2 3
LIGHTC
BUSYLED
C48
R31
0.01
33k
PTT
D13
MA8051 H
+5V
R32
470
T:0.0V
R:4.7V
C49 C51
R35
0.001
4.7 10k
R33
10k R110 D14
33k MA2S111
EXTPTT
C52 C53
0.001 0.001
R34
220k
INI
VCC
Q1 Q2
2SB1132 2SC4211
R14
R11 R12 R13 3.3k
390 390 390
DS5
DS6 DS7
LN1371G- LN1371G- LN1371G-
R15
C9
3.9k
0.1
DS10
DS8 DS9
LN1371G- LN1371G- LN1371G-
D11
MA2S111
R37
NTCCM16084LH
R36
15k
R38
CLOUT Q5 100k
UN9210
VCC
D18
MA8051 H
5.0V
EXTMIC
+5V
HV
TXC
PTT
EXTPTT
VORDET
+5V
Q11
Q17 Q16
XP4315
DTC144EE DTB123
6 5 4
C87
0.0047
1 2 3
R40
R39 R43
C86 100k
22k 100k
0.015
Q12 UN9211
R41
IC-A23 only
47k 10
11
R42 12
39
13
14
IC8 BU4094BCFV
C88
9 8 15
VSS
QS
10 7 LIGHTC
Q4
QS
11 6 RECC
Q8 Q3
12 5 PLAYC
Q7 Q2
13
4 VORON
Q6 Q1
14 3 SCK
Q5 CLK
15 2 SDATA
OE D
+5V
16 1 MASTB
VDD STR
OE
C45
0.001
C101
R60
0.001
39k
R61
R62
1 8 47k
220k
2 7
3 6
4
5
D16
MA2S111 C102
IC11 NJM2903V
470p
IC12 NJM2902V
R73 R74
C103
4.7k 220k
1 14
10
2 13
12
3
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
TBPS1
C106
R79
C108
C105
0.001
6.8k 0.001
10
R80
150k
C110 R77
0.1 220k
C109
R81 R82
0.001
1.8k 4.7k
IC-A23 only
C3
0.
8
NC
9
IN
NF
NF
NC
IN
NC
R
4
R63
15k