Icom IC-2720 Service Manual page 48

Dual band fm transceiver
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MAIN UNIT (4)
BUS LINE2
HV
5V
7.92V
Q11
2SA1588
5VS
8V
Q9
L90
DTC144EU
47n
VTX_CTRL
Q12
R1
2SA1588
1k
Q10
DTC144EU
C2183
UTX_CTRL
7p
Q13
R2
2SB1132
1k
R3
1k
HV
8V
IC1
M62352GP
1
20
VSS
GND
R_BPF3
2
19
R_BPF2
AO3
AO2
R_BPF4
3
18
R_BPF1
AO4
AO1
L_BPF1
4
17
DA_DATA
AO5
DI
L_BPF2
5
16
DA_CK
AO6
CLK
L_BPF3
6
15
DA_STB
AO7
LD
L_BPF4
7
14
AO8
DO
8
13
REFCON
AO9
AO12
MAIN
9
12
AO10
AO11
5VS
10
11
UNIT
VDD
VCC
8V
(3)
Q14
R161
2SC4116
47k
R162
47k
IC2
TA75S01F
Q15
2SC4116
5VS
BUS LINE4
UAGC
D2
MA2S728
UU1
VAGC
D3
MA2S728
VU2
D81
MA2S728
VV
D82
MA2S728
UV
D83
MA2S728
V220
D5
MA2S728
VU1
5VS
Q1
Q2
Q3
Q4
DTA114YU
DTA114YU
DTA114YU
DTA114YU
5VS
Q5
Q6
Q8
DTA114YU
DTA114YU
DTA114YU
C2167
Q2025
R2239
R2240
0.1
XP4601
4.7k
470k
R400_SHIFT
1
6
5VS
2
5
R2238
100k
3
4
C2166
0.1
C2209
Q2024
R2236
R2237
0.001
XP4601
4.7k
470k
1
6
5VS
2
5
R2235
100k
3
4
L400_SHIFT
BUS LINE3
10 - 5
VHF TX: 7.83V
RX: 0V
L91
R2216
R2218
C287
R18
47n
27
27
0.001
680
D77
1SV308
R12
C16
39
0.001
Q16
C2184
D78
2SK2854
7p
1SV308
C29
470p
Q38
2SC4226
R27
4.7k
C118 12p
TX_MUTE
HV
C123
D37
C90 0.001
22p
UM9401F
EP1
q
C87 100
r
EP2
R71
Q23
10k
2SC4116
R72
10k
Q26
Q22
2SC4116
DTA144EU
R63 33k
HV
5
R61
1
10k
4
3
2
VATT
5VS
UATT
R_R5
R400_R5
UU1
C10
C27
0.3p
8p
C4
C2106
L1054
1.5p
4.7µ
0.5p
D8
MA2S077
R_BPF4
R_BPF3
L400_R5
VU2
C12
C28
0.3p
8p
C5
L1058
C2117
3.5p
4.7µ
0.5p
D9
MA2S077
L_BPF4
L_BPF4
L_BPF3
L_BPF3
W2014
R800_R5
R800_R5
R181
82k
C279
R183
C280
1.5p
15
3.5p
Q35
D11
C7
2SC5006
MA2S077
3p
TX: 0V
RX: 0V
HV
C293 220p
L16
C44
R54
8.2n
0.001
150
C73 100p
TX: 6.07V
RX: 0V
Q21
2SK3475
R33
L26
47
HF50ACC322513-B
C74 0.1
R87 100
R89 2.7k
D41
D43
D44
UM9401F
UM9401F
UM9401F
C239
0.001
D36
C132
UM9401F
470p
C237
470p
L60
10n
L70 15n
C156
10p
D58
R96
MA2S728
10k
D50
MA2S728
Q28
DTC144EU
VATT
5VS
BUS LINE4
UATT
R_R5
R400_R5
UU1
L1052
4.7µ
L1053
Q19
4.7µ
3SK320
U-U (375-500MHz)
RX: 1.2V
C11 0.001
C25 0.001
RX: 4.0V
C60 8p
L400_R5
VU2
L1056
4.7µ
L1057
Q20
4.7µ
3SK320
V-U2 (375-500MHz)
TX: 0V
RX: 0V
C13 0.001
TX: 0V
C26 0.001
RX: 0V
R800_R5
R177
82k
C278
R178
C46
1p
39
3.5p
C2097
D2061
3.5p
1SV308
U-U3 (810-1000MHz)
TX: 0V
Q18
RX: 0V
2SC5624
R79
C83
220
470p
C292
Q25
220p
2SK3075
R91
470
R102
D2070
L71
D42
C242
L76
L77
100
UM9401F
470p
56n
68n
UM9401F
56n
C243
470p
L1059
56n
L54
56n
L55 54n
D61
MA742
C206
L73 15n
6p
D57
MA742
C210
L87
4p
12n
L88
12n
D71
MA742
L61 15n
VATT
5VS
UATT
C173 10p
R_R5
C81
1.5p
C66
0.3p
D55 UM9401F
L1051
4.7µ
C2101
0.5p
C197 6p
C235 0.001
R163 10
C67
C76
C276 0.3p
3.5p
0.001
R74
150
L1055
4.7µ
VHF TX: 4.4V
C2112
UHF TX: 0.12V
0.5p
RX: 4.32V
Q24
3SK274
W2037
W2012
W2033
W2008
W2034
W2002
W2010
W2003
W2011
W2005
BUS LINE2
HV
Q27
RD70HVF1
L80
47n
a
W2015
MAIN
UNIT
(5)
b
R173
10k
5VS
BUS LINE4
L1061
68n
VHF TX: 1.56V
UHF TX: 0V
RX: 1.53V
BUS LINE3

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