Icom IC-2300H Service Manual Addendum page 37

SECTION 10. VOLTAGE DIAGRAM
• LOGIC UNIT
IC3 (a)
C;2.4V
4
3
IC3
V+
1
GND
2
11
R103
150K
C85
0.1
C79
220P
BIAS
MICGND
5
1
R572
4
0
3
IC24
2 LMV321IDCK R8
2.2K
T;4.7V
R;0.0V
Q1
L2SC4081
R10
10K
EP1
MMZ1005Y102CT
EP2
MICIN
T;0.0V
MMZ1608Y102BT
GND
R;4.2V
MIC
MICE
PTT *EP5
R573 R47
EXTMIC *EP6
*EP7 1K 100K
MICUD
8V *EP8
R101
4.7K
R62
R0903N-B50K R61
R0903N-B50K
SW5V
J3
NOIS SD
35 36
DETO
33 34
IDET
31 32
29 30
27 28
DASTB EXTCK
25 26
MODIN
23 24
UNLK
21 22
19 20
OE PLLSTB
17 18
PLLCK DATA
15 16
EXTDATA PLLDATA
13 14
EXTSTB +8V
11 12
9 10
VOLOUT
7 8
LVIN PWRON
5 6
INT_SP
3 4
HVIN EXT_SP
1 2
C5V
C;COMMON
T;Tx
R;Rx CLONE
C42
C44
0.047
0.056
C;2.4V
12
14
13
IC3 (d)
C56
R53
0.0022
1.5M
C54 C57
0.01 0.0027
9
R39
10
270K
IC28
CD4066BPWR
1 I/O1 14
VDD
2 O/I1 13
CONT1
3 O/I2 12
THROUGH
CONT4
4 I/O2 11
I/O4
5 10 TEMP
CONT2 O/I4
6 9
CONT3 O/I3
7 8
I/O3
VSS
HEL
REMO
R558
R559
10K
100K
MICSEL
PTT
IC25
M61545AFP
1 8
VIN1 VIN2
R555
2 7
VOUT1 VOUT2
EXB28V102J
3 6
GND VCC
4 5
VOLCK
DATA CLOCK
VOLDATA WX
THROUGH
HEL
R556
EXB28V102J
1 16
STR V+
2 15 OE CTCIN
D OE
3 14 GRE
CLK Q5
4 Q1 13
AMB
Q6
5 Q2 12 DIM0
Q7
6 Q3 11 DIM1
Q8
7 Q4 10
Q'S
8 9
GND QS
R557
IC30
CD4094BPWR EXB28V102J
DATA
EXTSTB
1 16
STR V+
2 15
D OE
3 14 CP7
Q5
CLK
4 Q1 13
Q6
5 12
Q2 Q7
6 11 R566
Q3 Q8
7 Q4 10 100K
R567
Q'S
8 9
QS
GND 100K
R568
100K
IC29
R569
CD4094BPWR
100K
DETO
C;4.8V
R28
100K
RESET
4 3 C;0.8V
5 2
C;0.2V
R17 R21 IC5
68K 68K 6 1 BR24T64FVT-W
Q3
1
DMG504010
C;1.3V
2
3
R29
4
10K
PWRON
10 - 1
+8V
R56
68K
C;2.4V TXAF 1 I/O1 14
VDD
2 O/I1 13
CONT1
3 O/I2 12
CONT4
4 I/O2 11
I/O4
5 10
R575 CONT2 O/I4
6 9
22K CONT3 O/I3
(c)
IC3 7 8
VSS I/O3
8
IC6
CD4066BPWR
R574
1M
BIAS
MICGND
DIUD
DICK
D36
L1SS400
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
CONT1
CONT2
C43 R36
0.047
R27 12K
CTCOUT
39K
C39
0.001
C5V
8
A0 VCC
7
A1 WP
6 ESCK C5V
A2 SCL
5
ESDA
VSS SDA
X1
CR-910
Q5
LDTC144TE
R562
0
R48
1M
R93
1K
R72
150K
R81
120K
R76
C71 R73
C69 18K
0.01 100K 6 C;2.4V
0.018
7
CTCSS C73 5
2.2
R74
R67 IC3 (b)
150K
18K LMV324IPW
DS1
L1-1207TVM-1
SEG21
50 SEG22
49 SEG23
48 SEG24
47 SEG25
R99
46
SEG26
4.7K
45 SEG27 AMB
44 SEG28
43 SEG29
42 SEG30 GRE
IC1
41
SEG31
R5F2L3AACNFP
40 SEG32
39 SEG33
38 SEG34
37 SEG35
36
SEG36
35
COM4
R82
34 COM3
10K
33 COM2 DIM0
32 COM1
31
VOLCK
30
VOLDATA
29 PLLSTB
DIM1
28 PLLDATA
27 PLLCK
26
FLRXD
MODE
KR3
PWR KR2
KR1
KR0
PWRSW
IS0
IS1
IS2
KS0
R40
KS1
47K
V-MHz/SCAN
D7
MONI/ANM
LDAN222
SET/LOCK
M-CALL/PRIO
D25
TONE/T-SCAN
HVC376B-E
S-MW/MW S8
C53 LS8J2M
120P
D21 BANK/OPT
LDAN222
LOW/DUP
S10
LS8J2M
*: Refer to the PARTS LIST for the value and name of component.
S9
EC12E24204A9
2
A
1
COM
3
B
DIAL
R85
4.7K
Q7
Q10 2SC4116
2SC4116
R80
10K
Q8
2SC4116
Q11
2SC4116
DIMMER DIM1 DIM0
DIM-1 0.0V 0.0V
DIM-2 0.0V 5.0V
DIM-3 5.0V 0.0V
DIM-4 5.0V 5.0V
COLOR AMB GRE
OFF 0.0V 0.0V
GREEN 0.0V 5.0V
AMBER 5.0V 0.0V
YELLOW 5.0V 5.0V
R87
EXB28V102J
KR0
W/N
COMEXP BAND1
*D12
TXFREE BAND2 MARIN
KR1
KR2
BAND3
*D16
BAND4
*D17
KR3