1Stavco Board; 1Stbvco Board - Icom ic-r20 Service Manual

11-4 1STAVCO BOARD

C31 R46
0.01 1k
3.0V
R48
C60
2.3V 1k
0.01
R47
C59
0.01 1k
R49
180k
IC3
MB15T61UL
Q13
20
2SC5277
GNDOSC
21
SWA2
22
C40 SWB2
23
0.01 GNDDIG
24
SWA1
R28
15k
C38 R24 R23
0.68
3.3k 1k
C39
C35
0.68
0.0033
R26 R25
6.8k 220
Q7
2SC4117
Q6
C37
R27
2SK880
8.2k 1
R35
2.7k
1AVCO
R1
C48 47
C3
0.01
3p
L1 D2 C2 L3 L4
0.22µH 1SV245 0.001 15nH 1µH
Q1
C4 R2
2SC5006
4p 220
C1 D1 L2
0.001 1SV245 0.22µH
C5 C6 R4
0.001 0.1 8.2k
2AVCO
R6
47
C16
L5 L7
C10 L6
3p
1µH
0.22µH
0.001 18nH
Q2
R7
C11
2SC5006 220
2p
C9 D3
0.001
HVC417C
C12 C13 R9
0.001 0.1 8.2k
3AVCO
R11
47
C19
8p
L10
R54 L8 C18 L9 C23
47 0.22µH 0.001 27nH 1µH 0.5p
Q3
C20 R12
2SC5006
220
4p
C17
R13
0.001
D4 4.7k
HVC417C
C21 C22 R14
0.001 0.1 8.2k
1STAVCO BOARD
R57 JPW [SEA], [EXP] only
R57 1k
R56 JPW [SEA], [EXP] only
R56 1k
R55 JPW [SEA], [EXP] only
R55 1k
3.0V
R32 2.6V
150
R52
C61 C62 R50 R51
R30 R31 C44
0.1 0.1 100k 100k 100k
220 82k 0.001
12
FINRF1
11
C41 C42
FINRF2
10
XFINRF 0.001 0.001
9
GNDRF
8
C43
PS
C63
R29
2p
Q8
0.001 100k
2SC5231
3.0V
C64
C67
10
2.8V R53
0.001
82 [EUR], [UK], [USA], [CAN] only
3.1V
C58
0.1
Q12
XP1113
R5
220
3
4
2
C8
C54
0.1
0.001 5 1
R36
4.7k
C66 C65
C7 D7
10
10
0.5p 1SV308
4 3
2
R3
5 1 Q11
4.7k
XP1113
1.67V 3.0V
R10
220
R45
R33
C53
R44
1k
33
C15 C55 0.001 220
R43
0.1 0.001
82k
R37
C52
4.7k
0.001
D8
C14 R42 C50
1SV308
0.5p
47 5p
Q9
2SC5231
R8
4.7k
R15
330
C24
R41
C56
0.1
15
0.001
R38
4.7k
D9
IC2
C47
1SV308
µPC2746TB
0.001
3 GND 4 2.0V
OUT 5
2 GND
GND 6
1 IN
VCC
R34
220
C46
0.001
C49
10p
1.13V
R40
4.7k
Explanatory notes
VOLTAGE LINE

11-5 1STBVCO BOARD

J1
VP
1
GND
2
PLLASTB
to
3
PLLDATA
RF unit
4
PLLCK
5 HJ3
APS
6
OSC
7
R49
180k
C40
0.01
R28
15k C38
0.68
Q7
J2
2SC4117
+3V
1
A_R3V
2
A_VCO1
3
A_VCO2 to
4
A_VCO3 RF unit
R35
5
HJ2
GND 2.7k
6
GND
7
A_VCO_OUT
8
C48
0.01
L1
D2
0.22µH 1SV245
C1 D1
1SV245
0.001
L5
0.22µH
C9
0.001
R54
47
C17
0.001
3.0V
L11 D5
0.27µH HVC417C
C25 C26
0.001 0.001
C31 R46 R57 1k
0.001 1k
R56 1k
3.0V
R55 1k
R47
C60
2.3V 1k
0.01
R48
C59
1k
0.01
IC3
MB15T61UL
Q12
20 12
GNDOSC FINRF1
2SC5277 21 11
SWA2 FINRF2
22 10
SWB2 XFINRF
23 9
GNDDIG
GNDRF
24 8
SWA1 PS
C39 R24
R23
0.68 3.3k 1k
C35 2.8V
0.0033
3.1V
R26 R25
6.8k 220
Q6
R27 C58
C37
2SK880
0.1
8.2k 1
R5
180
22
[SEA],
[EXP]
1BVCO
R1 C8
47 C3 0.1
2p
R36
4.7k
C2 L3 L4
C7
0.001 12nH
1µH
0.5p
Q1
C4 R2
2SC5006 220
2p
R3
L2
0.22µH 4.7k
C5 C6 R4
R10
0.001 0.1 8.2k
220
22
[SEA],
[EXP]
2BVCO
R6
C15
47 0.1
C16
4p
R37
4.7k
L7
C14
L6
1µH
12nH 0.5p
C10 Q2
C11 R7
0.001
2p 220
2SC5006
D3
R8
HVC417C 4.7k
C12 C13 R9
0.001 0.1
8.2k
R15
470
3BVCO
R11 C24
47 C19 0.1
8p
R38
4.7k
L10
L8 C18 L9 C23
1µH
0.22µH 0.001 27nH 0.5p
Q3
R12
C20
220
2SC5006
D4 4p
R13
HVC417C
4.7k
C21 C22 R14
0.001 0.1 8.2k
L14
R19
C27
330 47nH
0.75p
4BVCO
C28 R16 C29 R18
R39
6.8k 0.001
0.75p 6.8k
4.7k
C45
0.5p
Q5
R17
2SC5006
L12 120
Q4
22nH
2SC5006
L13
C30
47nH 0.001
11 - 5
J1
VP
1
GND
2
PLLBSTB
R57 JPW [SEA], [EXP] to
3
PLLDATA RF unit
4
R56 JPW [SEA], [EXP]
PLLCK HJ7
5
BPS
6
R55 JPW [SEA], [EXP]
OSC
7
3.0V
2.6V
R32
150
C61 C62 R50 R51 R52
R30
R31 C44
0.1 0.1 100k 100k 100k
220
82k 0.001
C41
C42
0.001 0.001
C63
R29
Q8
0.001 100k C43
2p
2SC5231
3.0V
C68
R53 C64
0.001
82 10
[EUR], [UK], [USA], [CAN] only
J2
Q10
XP1113
4 3
+3V
B _ R3V
2
C54
B _ VCO1
0.001
B _ VCO2
5 1
B _ VCO3
B _ VCO4
C66 C65
GND
10 10
B _ VCO _ OUT
D7
4 3
1SV308
2
5 1
Q11
XP1113
C67
10
1.7V 3.0V
R45
C53
R33 R44
C55
1k
0.001
33 220
0.001
R43
C50 82k
R42
47 5p C52
0.001
Q9
2SC5231
D8
1SV308
C56
R41
0.001
15
D9
IC2
C47
1SV308
µPC2746TB
0.001
3 4
2.0V
OUT 5 3.0V
GND
2
GND GND 6
1
IN VCC
R34
220
C46
0.001
C49
10p
1.13V
C57
0.001
Explanatory notes
R40
VOLTAGE LINE
4.7k
D10
1SV308
1STBVCO BOARD
to
RF unit
HJ6