Icom IC-2720 Service Manual page 47

Dual band fm transceiver
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MAIN UNIT(3)
BUS LINE1
BUS LINE1
BUS LINE2
BUS LINE2
HV
HV
5V
5V
5VS
5VS
8V
8V
8V
R1116
22
D1008
IC1008
DA221
R1290
MB15A02PFV-1
100
g
1
16
OSCIN
B
2
15
R1131
OSCOUT
P
3
14
18k
VP
FOUT
4
13
VCC
NC
5
12
DO
FC
6
11
GND
LE
7
10
LD
DATA
8
9
FIN
CLOCK
PLLCK
R1126
10k
PLLDATA
R1129
10k
OUT2
R1132
10k
R_UNLOCK
R2265
C2171
10k
47p
MAIN
D2069
MA2S111
UNIT
(2)
C1075
L1038
100p
C1089
22n
47p
C1265
3p
Q1016
2SC4403
e
R1181
W2016
27k
UMMUTE
R1289
47k
Q1029
DTC144EU
c
d
WN_SEL
R1122
R1137
330
10k
Q1013
DTA144EU
Q2029
DTC144TU
[EUR],[ITR],[USA]
a
R1080
100
R1106
C1090
180k
0.01
Q1014
Q1017
XP6501
XP6501
R1113
330k
f
R1087
470k
IC2015
TC4W53FU
1
8
W2022
2
7
3
6
R1108
4
5
470
L_RSSI
L_SQL
VAGC
BUS LINE3
R1173
R1158
8.2k
1.2k
R_VVCO_SEL
R1135
R1139
4.7k
27k
R1159
R1169
8.2k
1.2k
R_UVCO_SEL
Q1026
XP4601
6
IC1003
TC4S66F
5
Q1020
4
2SA1586
R2250 3.3k
R1145
100
L1006
R1151
R1156
0.47µ
680
3.9k
W2013
R1146
1.2k
R1209
TX: 0V
RX: 0V
4.7k
Q1021
R1229
2SC4116
56k
C1192
47p
6
1
Q1042
2SC4226
5
2
4
3
Q1027
XP4601
C1174
4p
L1007
0.47µ
Q1039
2SC5231
Q2030
DTC144TU
[EUR],[ITR],[USA]
FI1001
CFWS450HT
[EUR],[ITA],[USA]
C1068
0.01
1
2
D1046
D1044
3
4
5
MA2S111
MA2S111
[EUR],[ITA],
[EUR],[ITA],
[USA]
[USA]
FI1000
D1045
D1047
CFWM450E
MA2S111
MA2S111
1
2
3
4
5
C1081 0.1
C1096 22p
R1127
1k
R1103
C1084
10k
0.001
C1085
0.001
R1174
470
W2025
W2021
C1108 82p
C1279 0.033
C1110 0.047
UAGC
VAGC
BUS LINE1
TX: 0V
RX: 0V
C1173
R1204
39p
10k
1
2
3
Q1038
C1186
2SC5231
1p
Q1043
2SC5231
R1227
2.2k
C1206
C1252
L1036
R1250
1p
1.5p
8.2n
4.7k
C1202
2.5p
D1026
D1027
MA2S077
MA2S077
TX: 6.38V
R1237
D1053
TX: 7.9V
RX: 6.38V
4.7k
MA2S111
RX: 7.9V
R1253
R1207
TX: 6.8V
470
10k
RX: 6.8V
C1201
C1208
4p
4p
C1187
0.5p
Q1044
2SC5231
R1172
C1138
C1180
180k
0.01
0.001
Q1022
Q1025
XP6501
XP6501
Q1040
2SC4406
R1178
R1161
330k
470k
FI1002
CFWM455E
1
2
C1166
3
4
5
10
R1168
C1134
10k
0.001
VHF TX: 4.62V
UHF TX: 0.11V
RX: 4.62V
C1135
0.001
W2024
C1185
0.001
C1148
Q1041
IC2016
82p
2SC4406
TC4W53FU
C1151 0.047
1
8
X1002
R1187
2
7
CDBLA455KCAY24-B0
1.5k
3
6
4
5
VHF TX: 0.24V
UHF TX: 0.0V
RX: 0.23V
BUS LINE2
HV
5V
5VS
8V
R2210
C1207
100
0.001
C1289
15p
R1236
4.7k
C1304
27p
C1249
C1200
15p
22p
Q1048
L1035
DTC144EU
22n
D1028
D1042
MA2S077
MA2S111
D1038
R2206
MA2S077
27
D2059
D2060
1SV308
1SV308
TX: 5.0V
D1049
RX: 5.0V
MA2S077
W2017
W2018
W2019
Q1047
2SC5231
R2223 180
R2225
180
R2224 180
R2221
220
C2140
R1254
4p
270
C2212 1p
D2065 1SV308
C1239
FI1003
0.001
C1197
R1234
FL-342
1
6
0.01
820
IFOUT
RFIN
2
5
GND
GND
3
4
VDD
LOLOCALIN
IC1005
GN02039B
R2229
180
R2230
180
D2071 MA2S111
R2275 120k
R2227
220
R2231
180
C2151
R1255
6p
270
C2211 1p
C1244
FI1004
C1198
R1235
0.001
FL-344
1
6
0.01
270
IFOUT
RFIN
2
5
GND
GND
3
4
VDD
LOLOCALIN
IC1006
GN02039B
10 - 4
BUS LINE2
HV
5V
5VS
8V
R400_R5
R800_R5
MAIN
UHFYGR
UNIT
(4)
R140_R5
W2035
W2036
BUS LINE4
L140_R5
L220_R5
L300_R5
L_R5
R2226
180
L400_R5
VIF
R140_R5
R400_R5
R800_R5
R_R5
UIF
UAGC
VAGC
BUS LINE3

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