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IC-2720H
Service manual
Icom IC-2720H Service Manual page 46
Dual band fm transceiver
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Also See for IC-2720H
:
Instruction manual
(96 pages)
,
Operating manual
(6 pages)
,
Step-by-step programming manual
(2 pages)
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Table Of Contents
52
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Contents
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Table of Contents
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MAIN UNIT(2)
BUS LINE1
BUS LINE2
HV
5V
5VS
8V
R1005
R1009
39k
3.9k
DTCS
C1023
10
Q1001
DTC144EU
DTCS_SEL
MOD_SET_DATA
PLLCK
C1024 0.01
R1041 22k
RIPTMOD
R1010
100
R1016
100k
R1050
R1017
100k
22k
R1024
150k
C1016
180p
R1026
220k
MAIN
UNIT
(1)
IC1000
NJM12902V
1
14
2
13
-
+
+ -
3
12
MODIN
4
11
5
10
6
9
-
+
+ -
7
8
C1278
R1058
10
120k
DATAMOD
Q1000
Q1002
Q1005
Q1006
DTA114YU
DTA114YU
DTA143ZU
DTA143ZU
R1033
3.3k
R1022
C1019
C1021
C1029
0.015
1.5M
0.0039
0.0018
R1048
VAFO
4.7k
VDETS
L_DET_MUTE
5VS
R1018
R1054
100k
68k
C1033
Q1003
0.033
XP4601
3
4
R1043
68k
2
5
1
6
R1003
100k
L_DTCS_IN
R1027
10k
10 - 3
BUS LINE1
BUS LINE2
HV
5V
5VS
8V
IC1009
R1045
M62363FP-650C
220k
1
24
VIN1
VIN8
2
23
VOUT1
VOUT8
R1288
3
22
VOUT2
VOUT7
47k
4
21
VIN2
VIN7
5
20
VDD
GND
MOD_SET_DATA
6
19
MOD
LD
RESET
PLLCK
7
18
R1165
CLK
VDAREF
8
17
10k
DI
DO
9
16
VIN3
VIN6
10
15
VOUT3
VOUT6
11
14
VOUT4
VOUT5
12
13
VIN4
VIN5
PLLCK
R1053
PLLDATA
68k
OUT1
C1039
390p
Q1023
2SC4116
C1125
10
R1082 100
Q1012
2SC4116
REF_MOD
L_PLLSW
L_UNLOCK
L1002
47n
R1067
10k
R1047
220k
C1037
L1000
0.01
1.2
C1042
C1051
C1057
68p
39p
0.01
5VS
Q1009
2SC4215
8V
Q1010
R1059
C1043
R1063
R1065
R1068
2SJ144
0.033
39k
680k
22k
12k
Q1007
XP6501
R1051
330
VDETS
L_DET_MUTE
R1020
R1055
100k
68k
R1061
R1062
C1035
68k
Q1004
0.033
68k
XP4601
3
4
R1044
68k
2
5
C1296
C1294
0.01
0.01
1
6
R1004
100k
R1029
10k
C1295
C1297
0.001
0.001
VCO UNIT
L10
RX: 7.11V
J1
56n
L_VCO8
L VCO8
GND
8V
R1
10k
REF_CON
J2
R3
PLLCK
100k
PLLDATA
C14
OUT1
1p
Q4
DTC144EU
J3
REF_OSC
REF_OSC
L_LO_SW
RX: 4.67V
8V
8V
C81 0.001
7.11V
Q5
DTC143ZU
Q9
DTA143ZU
R2
330
J4
REF_MOD
R55
L_PLLSW
10k
L_UNLOCK
L_VCO8
C30
0.1
R23
1.2k
L2
R28
0.47
100k
h
D7
MA2S077
R40
4.7k
D8
R38
C45
L5
L9
C64
R33
MA2S077
12
12
6p
39n
39n
0.001
D10
MA2S077
D9
C49
L8
C58
C65
D11
MA2S077
8p
10n
7p
7p
MA2S077
C46
C54
12p
6p
C74 0.001
R59
27
R57
3.3
C85
0.001
R1034
R1060
C1045
3.3k
680k
0.033
8V
R1023
C1020
C1022
C1030
Q1008
0.0018
0.015
1.5M
0.0039
XP6501
R1049
R1052
4.7k
330
BUS LINE1
BUS LINE2
HV
5V
5VS
8V
D12
D13
1SV308
1SV308
R53
C70
120
0.001
8V
5VS
R15
R18
C79
C23
27k
100
22p
470p
R19
3.3k
C25
C16
D2
0.047
56p
IC1
DA221
MB15A02PFV-1
R13
Q2
18k
2SA1586
1
16
OSCIN
B
2
15
OSCOUT
P
C80
3
14
R9 150
VP
FOUT
3p
Q3
4
13
VCC
NC
2SC4116
5
12
DO
FC
C76
6
11
47p
GND
LE
7
10
LD
DATA
8
9
FIN
CLOCK
D14
IC2
MA2S111
TC4S66F
C18
0.001
C22
R21
10p
100
L1
68n
C26
0.22
Q1
2SC4403
REF_CON
L_VCO8
C37
R35
12p
10k
Q6
Q8
C36
2SC5231
2SC5231
0.001
C62
C40
R39
4p
1p
120
R31
R45
4.7k
100
Q7
2SC5231
R61
1k
R48 4.7k
W1
Q10
DTC144EU
W4
IC3
R56
PB1509GV
1k
L14
L13
R62
1
8
150
68n
68n
2
7
3
6
C83
4
5
0.001
W2
W3
L_UR5
R58
27
RX: 0.58V
Q1011
R1066
R1070
R1064
2SJ144
39k
22k
12k
UDETS
i
BUS LINE1
BUS LINE2
HV
5V
5VS
8V
MAIN
UNIT
(3)
L_VR5
RX: 3.87V
L_RXL0
4.68V
BUS LINE3
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