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Icom IC-R20 Service Manual - Page 67

Board layouts, MAIN unit (top), TANSHI board (top), to TANSHI BOARD J1, to BC-156, MAIN UNIT J4

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Page 67 highlights

12-4 BC-156 BOARD LAYOUTS • MAIN UNIT (TOP VIEW) 1 1 CHGOUT CHGOUT DET2 BATT- J4 DET1 BATT+ SW CONT 9 THD to TANSHI BOARD J1 F1 • TANSHI BOARD (TOP VIEW) CP2 9 THD CONT 5V BATT+ J1 DET1 BATT- DET2 CHGOUT 1 CHGOUT to BC-156 MAIN UNIT J4 CP3 CP1 CP4 CP5 CP6 12 - 3

Section	Page
Top cover	1
Introduction	2
Table of contents	3
Specifications	4
IC-R20	4
BC-156	5
Inside views	6
Disassembly instructions	8
Circuit description	9
Receiver circuits	9
PLL circuits	15
Other circuits	18
Power supply circuits	19
Port allocations	20
BC-156 circuit description	22
Adjustment procedures	23
Preparation	23
Software adjustments	24
Parts list	30
IC-R20	30
1STAVCO board	30
1STBVCO board	31
2NDCVCO board	32
2NDDVCO baord	32
DOWNCONV board	33
REC unit	34
LOGIC unit	34
RF unit	38
BC-156	43
TANSHI board	43
MAIN unit	43
Mechanical parts and disassembly	45
Semi-conductor information	47
Transistor and FET's	47
Diodes	47
Board layouts	48
RF unit (top)	48
RF unit (bottom)	49
LOGIC unit (top)	50
LOGIC unit (bottom)	51
REC unit (top)	52
REC unit (bottom)	53
1STAVCO board (top)	54
1STBVCO board (top)	54
2NDCVCO board (top)	54
2NDDVCO board (top)	54
DOWNCONV board (top)	54
DOWNCONV board (bottom)	55
2NDCVCO board (bottom)	55
2NDDVCO board (bottom)	55
1STAVCO board (bottom)	55
1STBVCO board (bottom)	55
Block diagram	56
RF unit	56
LOGIC and REC unit	57
Voltage diagram	58
RF unit (1)	58
RF unit (2)	59
LOGIC unit	60
REC unit	61
1STAVCO board	62
1STBVCO board	62
2NDCVCO board	63
2NDDVCO board	63
DOWNCONV board	64
BC-156 desktop charger information	65
Disassembly information	65
Block diagram	65
Voltage diagram	66
MAIN unit	66
TANSHI board	66
Board layouts	67
MAIN unit (top)	67
TANSHI board (top)	67
MAIN unit (bottom)	68
Address	69