Icom IC-A23 Service Manual page 33

SECTION 11 VOLTAGE DIAGRAM
11 - 1 LOGIC UNIT
DS1
TTR3845UPFDCN
C1
0.001
76
SEG12
SEG12
R1 SEG11 77
SEG11
47k SEG10 78
SEG10
SEG9 79
SEG9
SEG8 80
SEG8
SEG7 81
SEG7
SEG6 82
SEG6
SEG5 83
SEG5
84
SEG4
SEG4
SEG3 85
SEG3
SEG2 86
SEG2
87
SEG1
SEG1
SEG0 88
SEG0
89
VCC
90
VREF
91
C2 AVSS
COM3 92
0.1
COM3
COM2 93
COM2
COM1 94
COM1
COM0 95
COM0
96
VL3
97
VL2
C140
R2 98
10 C2
100k 99
C1
100
VL1
C139
R3
0.1
100k
C138 C4 0.1
R4
0.1
100k
C5 0.001
C128 0.1
C129 0.1
C130 0.1
CHASSIS
C131 0.1
R107
S1
1M
UP
E
ON
R108
1M
R101
1k
R104
R100 1k
1k
R103
R102
1k 1k
S5
S2 S3 S4
UP DWN SQL POWER
S6 S7 S8 S9
1 2 3 CLR
S10 S11 S12 S13
4 5 6 ANL
S14 S15 S16 S17
7 8 9 BANK
S18 S19 S20 S21
ENT 0 MR F
D1
MA2S111
D2
MA6S121
LEFT SIDE
11 - 1
Q3
R17
2SD2216
C20
10k
R5 R16
0.001
100k 100k
C22
0.001
C6
0.001
IC3
12V in = 0V
S-81350HG-KD
9.6V in = 5.0V 5.1V
O
C26 C25
47 0.01
IC2
S-80945ALMP-DA9-T2
C23 R19
0.001 1M
C24
0.022
50 SEG38
P14/SEG38
49 SEG39
P15/SEG39
48 UNLK
P16
47 EDATA
P17
46 DASTB
P20
45 VOLCK
P21
44 VOLDATA
P22 R30
43 SCK
P23 22k
42 SDATA
P24
41 RFSTB
P25
IC1 40 MASTB
P26
39 OE
M38267M8L-266GP
P27
38
VSS
37
XOUT
36
XIN
35
XCOUT
34
XCIN
33 RESET X1
RESET
32 DCC 5.039MHz
P70/INT0
31 KR0
P71
30 KR1
P72
29 KR2
P73
28 KR3 R6
C7 C8
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
R111
100k
+5V
R9 R10 C19
100k 100k 0.001
C126
0.1
KR0
KR1 T:5.0V
R:0.0V
KR2
KR3
KR4
C10 C11 C12 C13 C18
0.001 0.001 0.001
0.001 0.001
KS3
R564
D4
1M
DA112 INI
LOGIC UNIT
KS2
R563
1M
IC-A23 only IC-A5 only
KS1 KS1
R562
1M D3 D3
DAP202U INI DA113 INI
KS0 KS0
R561
1M
12V in = 12V
9.6V in = 9.6V
D7 D8
MA8100 M MA2S111
R18
9.3V
10k CLOUT
D9
MA728
VCC
C35
R21 R23
C31 0.001
220k
10k
0.001
I IC16
G S-81250SG-QD Q4
2SB1182 R24 D18
100k MA8051 H
5 4
+5V
Q7
5.0V XP1501
1 2 3
HV
+5V
D10
C135 MA2S111
C33 C34
10
0.001 47
R20
C27 10k TXC
R98 C28 C29
Q6
1M 0.001 22
0.1 PTT
UN9213 C42
0.001
EXTPTT
VORDET
R22
4.7k
+5V
Q11
R25 R26 R27
R28 XP4315
180 180 1k
IC7 470
HN58X2432TI 6
C43
DS4
0.001
LT1EP53A
DS2 DS3
1
LNJ310M6URA LNJ310M6URA
D12
5 4 5 4 MA2S111
Q8
Q9
XP1201
XP1201
1 2 3 1 2 3
LIGHTC
BUSYLED
C47
C48
R31
470p
0.01 +5V
33k PTT
D13
MA8051 H C45
0.001
+5V
R32
470
T:0.0V
R:4.7V
C49 C51 R35
4.7 0.001
R33 10k
10k R110 D14
Q10
33k MA2S111
EXTPTT
2SB1462
C52 C53
0.001 0.001
R34
220k
C50
0.047
R73
INI 4.7k
VCC
R75
Q1 Q2 56k
2SB1132 2SC4211
R76
33k
R14
R11
R12 R13 3.3k
390 390 390
C105
10
DS5 DS6 DS7
LN1371G- LN1371G- LN1371G-
R15
C9 C110 R77
3.9k
0.1 0.1 220k
DS10
DS8 DS9
LN1371G- LN1371G- LN1371G-
IC-A23 only
D11
MA2S111
R37
NTCCM16084LH
R36
15k
R38
C37
Q5 100k
0.001
UN9210
5.0V
EXTMIC
Q17 Q16
DTC144EE DTB123EK
R46
TBPS1R104K475H5Q
5 4
C137 C136
C87
1 10
0.0047
R45 33k
2 3
R40 C90
R39 R43 C89
C86 100k
0.001 10
0.015 22k 100k R44
15k
Q12 UN9211 8 7
NC OUT2
R41 9 6
IN2
IC-A23 only 47k NC
10 5
NF2 VCC
11 4
NF1 ALC
R42 12 3
NC NC
39 13 2 C92 R47
IN1
GND D15 0.001 1M
14 1
IC8 BU4094BCFV NC OUT1 MA8036L
C88
9
VSS 8 15 IC9 BA3308F
QS LIGHTC
10 7
QS Q4
11 6 RECC RECC
Q8 Q3
12 5 PLAYC PLAYC
Q7 Q2
13
Q1 4 VORON VORON
Q6
14 3 SCK SCK
Q5 CLK
15 2 SDATA SDATA
OE D
16 1 MASTB MASTB
VDD STR
OE
C125
R69
10 18k
C101
R60 IC13 NJM2904V
0.001 R65
39k R64
4.7k 220k 1 8
R61 2 7
R62
1 8 47k 220k 3 6
2 7
4 5
R66
3 6
R63 220k
4 5
D16 15k R67 R68
C102 C114 10k 270k
MA2S111 C115
IC11 NJM2903V 0.1
470p 0.1
IC12 NJM2902V
R74
C103
220k R89
10 1 14
470
2 13
3 12
R84
11
4 R83 4.7k C113
C112
5 10 220k
0.1 0.1 R90
6 9 IC14 NJM2903V
7 8 100k
1
C111
R85 R86
3.3 2
18k 4.7k
3
C104 R78
C107 4
1 0.1 4.7k
R87
TBPS1S333K460H5Q
C106 R79 C108
0.001
6.8k 0.001
C121
R91
39k 0.01
R80
150k
R81 C109 R82 R88
0.001 33k
1.8k 4.7k
R560
1M
(IC-A5 only)
J1
1 40
OE OE
JACKDET JACKDET
SBAT SBAT
VOLCK VOLCK
CHGC CHGC
RFSTB RFSTB
TXC TXC
SCK SCK
SDATA SDATA
5
VOLDATA VOLDATA
VCC VCC
35
C59
0.001
UNLK UNLK
PTT PTT
PCK PCK
EXTPTT EXTPTT
PSTB PSTB
10
LIGHT LIGHT TO
RF UNIT
PDATA PDATA 30
J3
DASTB DASTB
EXTMIC EXTMIC
+5V
C65
0.001 +5V
HV HV
15
VREC
25
C66
0.001
VORDET
BEEP BEEP
RFDET RFDET
MOD
VORON
RSSI
RSSI
VORDET 20 21
R113
120k
C98
0.1
+5V
C91 R48 C93
R52
1
0.0047 100k 120k
IC15 ISD1420SI
5.0V
15 14
SP— SP+
16 13
VCCA VSSA
C601 17 12
MIC VSSD
0.22 18 11
MIC REF NC
19 10
AGC
C100 C99 A7 9
R58 20
R59 0.001 R109 ANA IN A6
100k 0.001 21 8
100k 100k ANA OUT NC
22 7
NC NC
23 6
PLAYL A5
24 5
PLAYE A4
25 4
RECLED A3
26 3
27 XCLK A2 2
REC A1
28 1
VCCD A0
C127
0.47
VORON
SCK
SDATA
MASTB
OE
Q15
XP4315
C116
C117
0.001 4 5 6
C123
R70 R71 0.1
0.001
180k 18k
IC-A23 only 3 2 1
C118
0.0047 VORON
R72
4.7k
VOR CH: 5.0V
C119
C120
0.001 R96
22
100k
8
7
6
R559
5 100k
(IC-A5 only)
R93 R95 D17
470k 22k MA2S111
Q13
2SC4211
R94
R112
820k
C122
R558 2.2M
C600 0.1
12k
0.01
RIGHT SIDE