Icom ic-r20 Service Manual page 17

Jan. 2010
SECTION 11. VOLTAGE DIAGRAM
RF UNIT (1/2)
W1 W2
R235
RDS2T0R0
1k
R234
820
RDS2T0R0
D69 R232
ATT-ON
1SV308 F
3.3k
0V
C540 R233
820
CP5 0.1
R247
C543
2.7
0.001
Q507
blue
1 2SC5008
EP2 B
2 white
W
BAR ANTENNA
3 red
0.4950 – 1.6200 MHz
R
green
4
G
D66
1SV308 F
CP8
D65 L81
C912
C872 0.27µH
0.1 1SV308 F
0.1
D73
R538
1SV308 F
JPW
C511
36p
C513
100p
CP7
D74
R246 1SV308 F
C567
220k
0.1
C859
0.001
R243
100k
C853
D100
15p
SVC389
L125
47nH
C852
27p
CP6
L124
56nH
C851 D75
27p 1SV308 F
R496
L123 4.7k
47nH
C860
0.001 D101
MA2S077G0
VP
C854
4 5 6
9p
ANTSW
L126
Q513 C855
18nH 47p
XP4601
3 2 1
A_TRAC
C856
7p
L127 C857
R329
18nH 100p
100k
R330
C669
15k
0.001
A_TRAC
ANTENNA
0.1500 – 3304.9999 MHz
C858
C546
12p
C541 C542
0.1
0.1 0.1 D3 C888
CP3
1SV308 F 0.001
D68
1SV172
R511
R239
2.2k
470 MHz 2.2k
2.9V
J10
C54
RFIN
RFIN 0.001
R95
8
GND 2.2k
7
O S C O S C
6
PLLCK PLLCK
5
to DOWNCONV
PLLDATA PLLDATA
BOARD J1 4
PLLESTB PLLESTB
C32
3 D11
1SV308 F 0.001
2
IF_OUT
1
C925 C924 C923 R522
10p 10p 10p 100k
DOWN
C923* – C925*
CONV
R510 D13 C45
2.2k 1SV308 F 470p
BOARD
R99 R98
J11 C47
1k
2.2k 6p
1
1
2 1GLO L11
2
15nH
3 2GLO C55
3
to DOWNCONV 0.001
4 DOWN_CONV
4
BOARD J2
5 +3V
5
6
6
C911
R534 100
2.7
+3S
C566 R241
0.01 2.2k
D170 D169
R327
100 MA2S7280G MA2S7280G
D76
C667 C545
MA2S077G0
0.01 0.01
R238
100k
C570 MF
C563
0.001 0.001
6 5 4
C533
Q508 0.0015
R237 XP4312
C891 C522 C523
2.7k
0.01 0.0015 0.0015
1 2 3
R236
C525 C526
10k
0.0047 0.012
C558 C544 C674
L91 L85
0.001 0.001
47p 3.9µH 3.9µH
R225 1k
C516
C519
L82 220p
0.0047
0.33µH
R222
L83
2.2k
0.47µH
R488 C842
C512
0.001
10p C515 330
C514
120p Q550
180p
FH102A-E
4 3
VHF PRE-AMP
C416 L128 C13 C841
27p 0.1µH
27p 18p
5 2
R486 C837
C843
C12 6 1
100
8p 100p
47p
R484 L121 R531
L70
22k 0.18µH
R485 100k
0.10µH
4.7k
C840 R487
C839
0.001 100
R216 0.001
2.2k
D148
MA2S7280G
C897
C548 145 MHz
0.001
0.001 2.6V
D149
MA2S7280G
30 – 300 MHz
Q36
C142
2SC5006 0.001
R478
L133
L9 L10 C665 C43
330
56nH
33nH 22nH 100p 100p
R105
C42
C666 68 R108
3.5p
R18 2.2k
390p
15k C838
C141
R494 100p
C40 C41 R6
L92 L41
4.7k 0.01
15p 5p 120
0.39µH 0.1µH
C861 C898
0.001 0.001
Q552 R106
C44
47k
UNR9113G0 0.01
D167 MA2S7280G
R495 4.7k
C673
C899
0.001 0.001
D160 MA2S7280G
ANTSW
R335 EAR
51 MHz
100k
C676 2.9V
A_ATTC
22p
ANTSW
EAR
A_TRAC
Q551
UHF PRE-AMP C847
R491
UPA805T 0.001
330
L3 L4 L5 L39
4 3
15nH 22nH 15nH 39nH
C845
C848 R492
8p
5 2 3p 150
C218
1p
R489 6 1
L122
22k R490
47nH
C22 C23 R493 C850
4.7k
7p 5p 433 MHz 150 100p
C846
C844
2.6V
0.001
0.001
B_ATTC
C901
AGC
0.001 D157 MA2S7280G
B_800M3V
D154 MA2S7280G
C887 0.001
B BAND 800M
R102
R100 C214 L131 2.2k
R101 L132
12k 0.001
47k 3.9nH 3.9nH
C145
C886
L130 0.001 Q24
0.001 D32
3.9nH
1SV308 F
D174 2SC5008
D176
HVC375B-E
HVC375B-E
L129 C138 R93
R523
D175
D173 3.9nH 470p R524
120 100k
HVC375B-E
HVC375B-E 100k
C147
C895 D36
Q26
2.5p 1SV308 F
470p
C46 C49 L13 2SC5624-E
3p 3p 5.6nH
L44
R112
C5 L43
4.7nH 2.2k
470p
1.5nH
C48
6p C50
C51 R19 C52 R20
1p
L12 2.5p 47k 470p 330 C414
C148
10nH
470p 0.001
R110 12k
B_BAND 1G
D156
MA2S7280G
B_ATTC
1295 MHz
2.9V
D155
MA2S7280G
16
Explanatory notes
C568
C571
3 4
R245
47p 0.001
22k
R240 2 5
1k
1 6
Q506
C536
C569 UNR9110G0
0.1
Q510
0.1
UMD6
C539
0.1
R229 L90
47k 100µH
L88 L89
D67
5.6µH 10µH
1SV308 F
D72
C534
C657
C658 1SV308 F
100p C535
150p R230
0.0012 390p
10k
L86 L87
C524 D70 C537
0.68µH 1µH
0.01 1SV308 F 0.1
Q505
2SC4226
C527
C528
R228 C538
47p 10p
R226 100 0.1
2.2k C530 HF L C531
C529
270p 100p
150p
D164
MA2S7280G
D163
C517 C518 D64
C520
MA2S7280G
100p 1SV308 F 5 MHz
0.0018 220p
C532
2.9V
0.1
R224
HF H R223
5 1
3.3k
L84
2.2k
0.68µH
2
D178
1SS400
4 3
C521 C560 C561
0.1 Q504 0.001 0.001
XP1110
R78
330 Q14
R539 C14 C15 C16 C121 D25
2SC5006
15 0.001 1p 0.001 0.001 1SV308 F
L28
D1 R10 L1 D2 R11
68nH R81
47k 47nH 47k
HVC350B-E 2.2k
HVC350B-E
C69
R9
0.001
120k
145 MHz
C408
R8 2.9V
C233 0.001
15k 0.001 A_TRAC
A-BAND VHF
A_VHF3V
C900
0.001
D166 MA2S7280G A_ATTC
D162 MA2S7280G
Q549
R540 C832 C833 C834 C835 D147
2SC5006
15 0.001 1p 0.001 0.001 1SV308 F
D145 R481 L120 R483 R482
D146
L119
47k 47nH 47k 2.2k
68nH
HVC350B-E
C827 HVC350B-E
0.001
R476
120k
R479
C828 C836
15k B_TRAC
0.001 0.001
B-BAND VHF
B_VHF3V
D152 MA2S7280G
AGC
D161 MA2S7280G
D34 1SV308 F
A_ATTC A_ATTC
ANTSW
EAR EAR
A_TRAC A_TRAC
R15 C30 R16
Q35
47k 0.001 47k
2SC5006
C28 C59 C58 C136 D29
C849 0.001 2p 0.001 7p 1SV308 F
100p
L61 D4 L60 D5 R91
R14
6.8nH 6.8nH 2.2k
68k
R88 C134 C27
HVC350B-E
330 0.001 0.001 HVC350B-E
R13 15k
D150 A-BAND UHF
C410 C150
MA2S7280G
0.001 0.001
D168 MA2S7280G
D159 MA2S7280G
Q548
R473 C815 R474
2SC5006 47k 0.001
47k
D143
C812 C814 C816 C817
1DV308
0.001 2p 0.001 7p
R469
L112 D141 L113 D142 R475
68k
6.8nH HVC350B-E 6.8nH 2.2k
R472 C811 C809
HVC350B-E
330 0.001 0.001
D151
R471
MA2S7280G
B_UHF3V
15k
C807 C808
B BAND UHF
0.001 0.001
433 MHz
2.9V
D153 MA2S7280G B_ATTC
AGC
D158 MA2S7280G
C868
B_ATTC 0.001
B_800M3V
B_TRAC
B_G3V
AGC
433 MHz
3.0V
B_R3V
IC15
µPC2757TB C71
VOLTAGE LINE
3p
1 6
RFI IFO
RX LINE 2 5
GND VCC FI1 EFCH266MKQP1
3 4
LO PS
I
C746 C748
B_R3V 3.5p 0.001
R423
ATT
15
L15
A_R3V
47nH
C747 L101
ANTSW 6.8nH
0.001
B_VCO OUT
B1C B BAND RF IN
C919
HFC
0.001
Q509 C562
0.001
UNR9113G0
AGC
AGC
B_R3V
R533 C910
C921
10 100
3
0.001
GND
2
GND
1
IN
R501 C866
IC18
0.001
4.7k
µPC2746TB
B BAND RF AMP
A_TRAC
B2C
B3C
300M3V
A_VHF3V
A_UHF3V
C503 0.001
B_VHF3V
C862 0.001
B_UHF3V
C863 0.001
B_G3V
C504 0.001
B_800M3V
C505 0.001
B_R3V
ANTSW
A_R3V
A_R3V
B_TRAC
A_ATTC
300M3V IC19
µPC2746TB
EAR 3
GND OUT
C662
2
0.1 GND GND
1
IN VCC
R231
4.7k
A BAND RF AMP
A_UHF3V
A_ATTC
A_R3V
B_TRAC
L56
6.8nH
C153
0.1
IC1
µPC2757TB
C677
2p
1 6
RFI IFO
2 5
GND VCC FI4 EFCH429MKQP1
B_UHF3V 3 4
LO PS
I
C206 C70
3.5p 0.001
R220
AGC
15
B_ATTC
R221 L93
R4
330 22nH
330
B_800M3V B_800M3V
B _ T R A C B _ T R A C
B_G3V B_G3V
AGC
*: Refer to the PARTS LIST for the value and name of component.
B_R3V
IC16
µPC2757TB IFO16
C436
3p
1 RFI 6
O IFO
2 GND 5
VCC
3 LO 4
PS
C750
0.001
L74
C749
47nH
0.001
CP18
D_VCO OUT
D_VCO OUT
B_VCO OUT
B_RXV
ATT
AGC
R497 220
R499
C865
0.001 82
4
OUT
5
GND
6
VCC
R498 R500
82
C864 100
0.1
433 MHz
1.9V
A_TRAC
A_R3V
A
Q501
UNR9113G0
A_300MC
Q502
XP1113
5 1 A_VHFC
2
3 A_UHFC
4
Q554
XP1113
4 3
B_VHFC
2
5 1
B_UHFC
B_R3V
Q503
XP1113
5 1
B_GC
2
4 3
B_800MC
ANTSW
R323 220
B_TRAC
145 MHz
2.0V
A_ATTC
C663 R325
0.1 82
4
5
6
R324 R326
C664
100 82
0.1
IFO10
A_R3V
145 MHz
C435
3.0V
0.001
IC10
L94
C678 C683
33nH µPC2757TB
0.001 0.001
O
1 6
IFO
RFI
2 5
GND VCC
3 4
LO PS
L95
15nH
C432
C679
0.001
0.001
A-AGC
B