Icom IC-R20 Service Manual - Page 55
DOWNCONV board (bottom), 2NDCVCO board (bottom), to RF UNIT HJ6
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The combination of this page and the previous page shows the unit layout in the same configuration as the actual P.C. Board. 2NDCVCO BOARD • BOTTOM VIEW DOWNCONV BOARD • BOTTOM VIEW to RF UNIT HJ11 1 6 GND 1GLO 2GLO DOWN_CONV +3V +3S J2 2NDDVCO BOARD • BOTTOM VIEW J1 1 8 to RF UNIT HJ10 IF_OUT GND PLLESTB PLLDATA PLLCK OSC GND RF_IN 1STAVCO BOARD • BOTTOM VIEW 8 A_VCO_OUT GND GND A_VCO3 J2 A_VCO2 A_VCO1 A_R3V 1 +3V to RF UNIT HJ2 1STBVCO BOARD • BOTTOM VIEW 8 B_VCO_OUT GND B_VCO4 B_VCO3 J2 B_VCO2 B_VCO1 B_R3V 1 +3V to RF UNIT HJ6 9 - 8 to RF UNIT HJ3 OSC 7 APS J1 PLLCK PLLDATA PLLASTB GND VP 1 to RF UNIT HJ7 OSC 7 BPS J1 PLLCK PLLDATA PLLBSTB GND VP 1
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The combination of this page and the previous page
shows the unit layout in the same configuration as the
actual P.C. Board.
IF_OUT
GND
PLLESTB
PLLDATA
PLLCK
OSC
GND
RF_IN
1
8
to RF UNIT HJ10
GND
1GLO
2GLO
DOWN_CONV
+3V
+3S
1
6
to RF UNIT HJ11
J1
J2
J2
B_VCO_OUT
GND
B_VCO4
B_VCO3
B_VCO2
B_VCO1
B_R3V
+3V
8
1
to RF UNIT HJ6
J2
A_VCO_OUT
GND
GND
A_VCO3
A_VCO2
A_VCO1
A_R3V
+3V
8
1
to RF UNIT HJ2
J1
OSC
BPS
PLLCK
PLLDATA
PLLBSTB
GND
VP
7
1
to RF UNIT HJ7
J1
OSC
APS
PLLCK
PLLDATA
PLLASTB
GND
VP
7
1
to RF UNIT HJ3
9 - 8
1STAVCO BOARD
• BOTTOM VIEW
1STBVCO BOARD
• BOTTOM VIEW
2NDCVCO BOARD
• BOTTOM VIEW
2NDDVCO BOARD
• BOTTOM VIEW
DOWNCONV BOARD
• BOTTOM VIEW