![background image](http://html1.mh-extra.com/html/icom/ic-r20/ic-r20_service-manual_3569421041.webp)
Aug. 2009
21
• DOWNCONV BOARD
(BOTTOM VIEW)
•2NDCVCO BOARD
(BOTTOM VIEW)
•1STAVCO BOARD
(BOTTOM VIEW)
•1STBVCO BOARD
(BOTTOM VIEW)
•2NDDVCO BOARD
(BOTTOM VIEW)
The combination of this page and next page shows
the top side and bottom side of actual P.C. board.
J2
A_VCO_OUT
GND
GND
A_VCO3
A_VCO2
A_VCO1
A_R3V
+3V
8
1
J1
OSC
APS
PLLCK
PLLDATA
PLLASTB
GND
VP
7
1
J2
B_VCO_OUT
GND
B_VCO4
B_VCO3
B_VCO2
B_VCO1
B_R3V
+3V
8
1
J1
OSC
BPS
PLLCK
PLLDATA
PLLBSTB
GND
VP
7
1
IF_OUT
GND
PLLESTB
PLLDATA
PLLCK
OSC
GND
RF_IN
1
8
GND
1GLO
2GLO
DOWN_CONV
+3V
+3S
1
6
J1
J2
C31
C35
C37
C38
C39
C41
C42
C43
C44
C46
C47
C48
C49
C50
C52
C53
C58
C59
C60
C61
C62
C63
C64
C65
C66
C67
IC2
IC3
J1
J2
Q6
Q7
Q8
Q9
Q11
Q12
Q13
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
R51
R52
R53
R55
R56
R57
H0
H5
H10
H15
H20
V0
V5
V10
V15
C31
C35
C37
C38
C39
C40
C41
C42
C43
C44
C46
C47
C48
C49
C50
C52
C53
C58
C59
C60
C61
C62
C63
C64
C65
C66
C67
C68
IC2
IC3
J1
J2
Q6
Q7
Q8
Q9
Q10
Q11
Q12
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
R51
R52
R53
R55
R56
R57
B6081E
H0
H5
H10
H15
H20
H25
V0
V5
V10
V15
C14
C15
C16
C17
C18
C21
C23
C26
C44
C45
C46
C47
C48
C49
C50
C51
C52
C53
C54
C55
D2
IC4
J1
J2
L11
Q2
Q3
Q5
Q6
R3
R6
R14
R15
R16
R17
R18
R19
R20
R29
R30
R31
R32
B6
0
79C
H0
H5
H10
V0
V5
V10
V15
V20
C16
C17
C18
C19
C20
C21
C25
C26
C27
IC1
R9
R10
R11
R12
R13
R14
R15
R22
C-VCO
H0
H5
H10
V0
V5
V10
V15
V20
C16
C17
C18
C19
C20
C21
C25
C26
C27
IC1
R9
R10
R11
R12
R13
R14
R15
R22
D-VCO
H0
H5
H10
V0
V5
V10
V15
V20