2Ndcvco Board; 2Nddvco Board - Icom IC-R20 Service Manual

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