Icom ic-r20 Service Manual page 106

AM/NFM CONT
B_R3V
C885 C757
B_R3V
0.001 0.1
R425
FI7 FL-293
1k R521 L102
19.650 MHz
47 2.7µH
1 2
D130
IFO16 C753
MA2S077 C752
22p
3 4
22p
C754
0.001
D131 R537 D133
MA2S077 56 MA2S077
R428
C755
10k
R427
470p
100
C756
0.1
WFM
2.9V
ATT
OSC
AGC
AGC
ATT
B_WFMC
A
IC20 M62366GP
1 20
VSS GND
2 19
AO3 AO2
3 18
AO4 AO1
4 17 D
AO5 DI
5 16 CLK
AO6 CLK
6 15
AO7 LD
7 14
AO8 DO
8 13
AO9 AO12
9 12
AO10 AO11
10 11
VDD VCC
+3S
D
C867
B_VHFC
0.01
B_UHFC
B_GC
B_800MC
ANTSW
B_TRAC
A_ATTC
OSC OSC
C884
0.001
R204 FI3 FL-293
1k L73
R520 19.650 MHz
47 2.7µH 1
D58
MA2S077 C427
3 4
22p
D59
IFO10
MA2S077
C18
0.01
R536
R207
56
R203 10k
C745
100
470p
C202
0.1
A_R3V
A_R3V
Explanatory notes
VOLTAGE LINE
RX LINE
A-AGC
B
B_R3V
B_R3V
R430
C882
R435
10k
0.001 L104
47k
R426 3.3µH
680 R432
15k
C759 C761
0.001 0.001
D132 R431
MA2S077 220k
C758
R434
0.001
180
B_NOISE
Q542
B_RSSI
R429
10k 2SC5006
C766
WFM_CONT 0.01
R433 C760
C762
1k 0.001
100p
D172
MA2S728
B_R3V
433 MHz
C869
1.5V R505
0.01
12k
C765
R503 C871
10p
0.01
1.5M
CP12
Q555
L105
2SC5006
LS-510
R518 C870
1k
0.01
R461
10k
AGC
ATT ATT
WFM_CONT
IC22
CD4094BPWR
+3S
1 16
STR V+
D 2 15
D OE
3 14
CLK Q5
4 13
Q1 Q6
5 12
Q2 Q7
6 11
Q3 Q8
7 10
Q4 Q'S
8 9 3.0V
GND QS +3S
+3S
C740
FSET
0.01
D
CLK
R516
R512
100k
1.6V
3.9k C694
0.1
C878 R515
100k
R513 0.01
C877
220k X1 CR-593
C873
0.01 19.200 MHz
220p
Q556
C879
C875 C874
10p
2SC4617
68p 18p D171
HVC350B
R514
C876 1.8V
2.2k 56p
R415
L134 1.5M
R414
4.7µH
12k
R517 C424 Q540
OSC 1k 0.01
2SC5006
A_R3V
C744
19.200 MHz
0.01
SSB3V
D106
C741
1SS400
0.01
D107
A_R3V
A_R3V 1SS400
C201
0.1
C74
R205
L17 145 MHz
10k 0.001
3.3µH 3.0V
R68
R35
2
47k
15k
R209 C102 C75
C430
0.001 0.001
0.01 680
D60 R36
D61 MA2S077 220k
R62
MA2S077
180
C431
C103
R208 Q5
0.001
10k 0.01
2SC5006
C101
R34 C73 10p
0.001
WFM 1k
2.9V
C259
L21
100p
LS-510
CP2
R103
10k
A_R3V
C896
0.01
C264
SSB3V
0.001 C713
0.1
R381
D165 CW
2.6V 330
MA2S728 R382
1.5k
C712
0.1
R379
R380
1.5M 2.7k
C711
0.1
Q530
R385
100k
2SC4617
11 - 2
B_R3V
B_R3V
C779
R445
0.01
FI8
C775 C776 433 MHz 10k
CFWM450E
10 0.22 3.0V
R444
I
1k
3rd_Lo D134
C777
1SS400
0.01
16 1
D135
MIXIN OSCIN R447
1SS400
15 2 R519 220
C774
GND OSCOUT
4.7k
0.01
14 3
N-REC MIXOUT
4 B_R3V
13 R448 C781
N-DET VCC
2.2k 220p
5
12 C784
RSSI IFIN
0.01
11 6
IFOUT DEC
10
7
QUAD FILOUT C773
9 8 0.1 R451
C786 R454 R455
AFOUT FILIN
3.3k
1k
150p 100k
R438
C768
100k C769
IC17
470p R452
470p C785
TA31136FN 150k
15p
4 5 6
Q544
R440
R439
47k R453
1.5k XP6501
D138
150k
MA2S728
C770
3 2 1
0.01
C764 AGC
0.001 Q543 R443
C771 R442 C792
470 0.01 15k 0.01
UNR9113J
CP11
C772
R441
0.001
R436 680
2.2k
C767
R437 DET_OUT
0.22
22k
D139
R462 C795
WFM_CONT
3.9k MA2S728 0.1
C880
0.001
C794 R464 R465
AGC
0.001 10k 22k
C796
WFM_CONT R463
10k 0.22
IC12
IC14
CD4066BPWR
M62366GP
A_DET
1 20
VSS GND
2 19 1
AO3 AO2 I/O1
2
3 18
AO4 AO1 O/I1 CONT1
4 17 3
AO5 DI O/I2 CONT4
5 16 4
AO6 CLK I/O2
6 15 5
AO7 LD CONT2
7 14 6
AO8 DO R397 CONT3
8 13 7
AO9 AO12 VSS
100k
9 12
AO10 AO11
10 11
VDD VCC
NB-ON
+3S
2.9V
+3S
R355 R358 R360 R361
C699
Q523
1.5k 2.2k 150k
1.5k 220p
C697
2SC4617
0.01
C700
R359 220k
0.01
Q521 4 5 6
2SC4617
Q525
R362
XP6501 150k
R363
R354 R352 R356 4.7k
3 2 1
27k 100k 270
R357
C703
330k
0.47
R367
R353 C698
Q522
47k 0.01 220k
2SC4617
C894 R530
4.7k
0.01
SSB3V
C688
0.01
R346
10k FI6
CFWS450K3
I
D110
C691
A_R3V 1SS400 0.01
C241
C659
0.22
10
R159
IC2
1k
C221
R49
TA31136FN 0.01
FI2
10k
CFWM450E
16 1
C239
MIXIN OSCIN
15 2
0.01
GND OSCOUT I
14 3
N-REC MIXOUT D109 C689
4
13
N-DET VCC 1SS400 0.01
12 5
RSSI IFIN
11 6
IFOUT DEC D108
10 7
QUAD FILOUT 1SS400
9 8 C100 C92
AFOUT FILIN
0.1 0.01
R60
C98 C99
100k R46
L99
470p 470p
4.7k C686
470µH
390p
C94
0.001 Q41
R59
R56 R61
UNR9113J
1.5k
470 47k
R30
R31
C63
C97 3.3k 1k
150p
C64 R177
R55 0.01
100k
2.2k 15p
R54
R116
C96 R57 R58
22k
C242 0.01 150k
15k 680
4 5 6
A_R3V 0.22
R525
C95
R179 10
C93
0.001
150k
0.001
D57
MA2S728
3 2 1
CP1
Q1 XP6501
SSB3V
C889 C200
R396 CW
0.01
22k 0.1 D115 C717 C62
2.9V
RB876W 0.1 10
C714 R386
R391
0.01 2.2k
R394
10k
27k
C720
R384
Q531
R388
0.01
47k R392
2.2k
2SC4617
47k
R390
D116
27k
RB876W Q532
R389
2.2k
2SK1069
C715 R387
R383 R528
1.5k 0.01 2.2k 2.2k
C716
470p C890
C718 C719 R393 0.1
0.01 0.001 22k
A_R3V
B_R3V
AM/NFM CONT
AM/NFM_CONT
C780
R446
Q553
0.1
10k
XP1113
O B_AM FM
C778 D136
4 3
B_R3V
0.01 1SS400
R450
2
10k B_WFMC
D137
5 1
1SS400
WFM_CONT
L106
WFM CONT
C782
470µH R449 C783
220p
2.2k 0.1
B_R3V
B_AMC
R457 D_VCO OUT
C788 4 5 6
C881
47k
0.01
0.001
Q546
R527
XP4312
10
4 5 6
2 1
Q545 3
XP6501
C793
0.01
C791
3 2 1 AM MODE
10
B_RXV
B_DET
B_VCO1
R458 C789 R459 C790
470k
1M 0.001 0.01
IC21
CD4066BPWR B_VCO OUT
B_R3V
1 14
I/O1 VDD
2 13
R466
O/I1 CONT1
3 12
4.7k AM_DET O/I2 CONT4
4 11
I/O2 I/O4
5 10
CONT2 O/I4
6 9
CONT3 O/I3
C797 R467 7 8
VSS I/O3
0.001 100k
ANL_CONT
Q547
BPS
UNR9213J
Q535
14 D121 DAP222 A_WFMC
VDD
XP1113
13
4 3
12 A_NFMC
11
I/O4 2 A_R3V
10
O/I4
9 R398
O/I3 A_AMC
100k 5 1
8
I/O3
LD1
A_DET
CLK
SSB3V SSB3V
D
+3S
NBC
C705 Q526 A_R3V
Q527
0.1
UNR9113J
UNR9113J
NB-ON Q524
1.0V
2SC4617
R370
STR2
R365
10k
22k
R368 R369 C704
C701 R364
15k 330 0.01
0.01 56k
Q528
2SC5006
R366
C893
100k C702
0.01
0.1
C706 R372
B_RSSI
0.001 100k
B_NOISE
+3S
SSB3V
CW
2.9V +3S
Q519
UNR9113J
LD2
SSB3V
SSBC
B_DET
R347
10k
R529 C692
470 0.01
O
D113
1SS400
D119
DAP222
Q534
APS
A_AMC
C203 XP1113
R50
0.1
10k A_NFMC
D112
C690 4 3
1SS400
0.01
O 2 A_R3V
R542
15k
5 1 A_WFMC
D111 R172
1SS400 10k
C922
150p
C687
C434
390p
R174
0.1
4.7k
A_R3V A_R3V
C65
R26
0.01
C66
47k
SSBC
0.01
A_AMC
5 6 4 5 6
R526
D117
10
DAP222
C433
0.001
3 2 1 3 2 1
Q4
Q44 A_VCO3
XP6501
XP4312
R29
R28
C60
470k
1M C61
0.01
0.001
R373 C709 R377
3.9k 0.1 4.7k A_DETAM
D114
C710
C707 R374 R378
MA2S728 0.001
0.001 100k
10k
R376
22k
A_ANLC
Q529
R375 C708
0.22
10k UNR9213J
A_R3V A_R3V
HJ8
PLLDSTB 1
1
PLLDATA 2
2
to 2NDDVCO BOARD
PLLCK 3
3
+3V +3V J2
4
4
GND 5
5
OSC 6
6
2NDDVCO
BOARD
HJ9
B_R3V B_R3V
1
1
GND 2
2
BPS 3
to 2NDDVCO BOARD
3
D_VCO OUT 4
J1
4
GND
5
5
C918
0.001
HJ6
+3V +3V
1
B_RXV
2
B_VCO1 to 1STBVCO BOARD
3
B_VCO2 J2
B_VCO2
4
B_VCO3 B_VCO3
5
B_VCO4 B_VCO4
6
7
B_VCO OUT
8
C902 1STBVCO
47p
BOARD
R541 C905 C904 C903
47p 47p 47p
150
HJ7
VP VP
1
1
GND 2
2
PLLBSTB PLLBSTB 3
3
PLLDATA 4
to 1STBVCO BOARD
4
PLLCK 5 J1
5
BPS
6
6
OSC OSC 7
7
J1
C920
0.001 1
A_RSSI A_RSSI
40 2
A_VCO2 A_VCO2
A_NOISE A_NOISE
39 3
A_VCO1 A_VCO1
38 4
EAR EAR
A_R3V
37 5
LD1
A_DET
36 6
CLK
BFO BFO
35 7
D
PLLASTB
34 8
B3C B3C
PLLCSTB
33 9
B2C B2C
PLLESTB PLLESTB
32 10 LOGIC
B1C B1C
C402
31 11
UNIT
HFC 0.001 HFC
VP
30 12
STR2
PLLDSTB to LOGIC unit J5
29 13
PLLDATA
PLLBSTB
28 14
PLLCK
27 15
B_VCO4
+3V
26 16
B_VCO3
B_RSSI
25 17
B_VCO2
B_NOISE
24 18
23 19
+3S
B_R3V
22 20
LD2
B_DET
21
HJ5
A_R3V A_R3V
1
1
2
GND
2
APS 3 to 2NDCVCO BOARD
3 J1
C_VCO OUT C_VCO OUT 4
4
GND 5
5
2NDCVCO
BOARD
HJ4
PLLCSTB
1
1
PLLDATA 2
2
PLLCK 3
3 to 2NDCVCO BOARD
+3V
4
4 J2
GND 5
5
OSC 6
6
C909
R532
100
10
A_R3V
C913
0.001
HJ2
+3V +3V
1
D179 1SS400 2
A_VCO1 A_VCO1
3
A_VCO2 A_VCO2
4
to 1STAVCO BOARD
A_VCO3
5
J2
GND
6
GND
7
8
C908 C907 C914 C906
1STAVCO
47p 47p 0.001 47p
BOARD
A_VCO OUT A_VCO OUT
HJ3
VP VP 1
1
GND 2
2
PLLASTB PLLASTB 3
3
PLLDATA PLLDATA 4 to 1STAVCO BOARD
4
PLLCK PLLCK 5 J1
5
APS 6
6
OSC
OSC 7
7
C916 C917
0.001 0.001