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Icom Manuals
Transceiver
IC-R20
Service manual
2Ndcvco Board; 2Nddvco Board - Icom ic-r20 Service Manual
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:
Instruction manual
(108 pages)
,
Service manual
(70 pages)
,
Price list
(158 pages)
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Table of Contents
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11-6 2NDCVCO BOARD
L4
0.22µH
R1
C33
C2
47
2p
18p
C1
0.33
PLLDATA
R13
R12
1k
1k
C18
47p
C19
47p
C20
47p
R22
330
R15
820
C21
4.7
11-7 2NDDVCO BOARD
R1
L4
47
0.22µH
C2
56p
C1
0.33
PLLDATA
R13
R12
1k
1k
C18
47p
C19
47p
C20
47p
R22
330
R15
820
C21
4.7
1CVCO
R4
1k
2.3V
C6
6
0.001
5
C3
C4
L1
4
15p
10p
18nH
D1
R2
1SV314
R3
C5
10k
1k
12p
APS
PLLCSTB
PLLCK
R11
1k
IC1
MB15E03SL
9 CLK
10 DAT
11 LE
12 PS
R14
13 ZC
10
14 L/F
OSCO 3
15 P
OSCI 2
16 R
C27
0.001
Explanatory notes
VOLTAGE LINE
1DVCO
R4
1k
2.3V
C6
6
0.001
5
C4
L1
C3
4
12p
22nH
22p
D1
R2
HVC305B
47k
R3
C5
330
27p
BPS
PLLDSTB
PLLCK
R11
1k
IC1
MB15E03SL
CLK
9
DAT
10
LE
11
PS
12
R14
ZC
13
10
L/F
14
OSCO
P
15
R
16
C27
0.001
Explanatory notes
VOLTAGE LINE
Q4
2.4V
2SC4617
R21
L2
C30
1k
33nH
C32
0.001
10
1
L3
C7
2
22nH
4p
3
C8
Q1
1p
FH102
C9
C10
5p
5p
1.7V
C17
R9
5p
56
C16
470p
3.0V
FIN
XFIN 8
R19
GND 7
1k
DO 6
C25
VCC 5
0.001
VP 4
R18
1k
1
C24
C26
0.01
0.1
Q3
2SC5277
2NDCVCO BOARD
Q4
2.4V
2SC4617
R21
1k
L2
C30
47nH
0.001
C32
10
1
L3
C7
2
10p
22nH
3
C8
Q1
4p
FH102
C9
C10
8p
8p
1.7V
C17
R9
5p
220
C16
470p
FIN
8
R19
XFIN
7
1k
GND
6
C25
DO
5
0.001
VCC
4
R18
VP
3
1k
2
OSCI
1
C24
C26
0.01
0.1
Q3
2SC5277
2NDDVCO BOARD
11 - 6
3.0V
A _ R3V
C _ VCO _ OUT
C31
0.001
C _ VCO _ OUT
R10
100
APS
PLLCSTB
PLLCSTB
PLLDATA
PLLDATA
PLLCK
A _ R3V
+3V
2.3V
C23
0.01
R17
180k
C22
R16
0.01
1k
0.7V
3.0V
B _ R3V
D _ VCO _ OUT
C31
0.001
D _ VCO _ OUT
R10
100
BPS
PLLDSTB
PLLDSTB
PLLDATA
PLLDATA
PLLCK
B _ R3V
+3V
3.0V
2.3V
C23
R17
0.01
180k
C22
R16
0.01
1k
0.7V
J1
A _ R3V
1
GND
2
to
APS
3
RF unit
4
HJ5
GND
5
J2
1
2
to
PLLCK
3
RF unit
+3V
4
HJ4
GND
5
OSC
6
J1
B _ R3V
1
GND
2
to
BPS
3
RF unit
4
HJ9
GND
5
J2
1
2
to
PLLCK
3
RF unit
+3V
4
HJ8
GND
5
OSC
6
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