Icom ic-r20 Service Manual page 43

Aug. 2009
RF UNIT (2/2)
AM/NFM CONT
B_R3V
C885 C757
B_R3V
0.001 0.1
R425
FI7 FL-293
1k L102
R521
19.650 MHz
47 2.7µH
1 2
D130
IFO16
MA2S077G0 C752
3 4
C754 22p
0.001
D131 R537 D133
MA2S077G0 56 MA2S077G0
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
O S C O S C
C884
0.001
R204 FI3 FL-293
1k L73
R520 19.650 MHz
2.7µH
47 1
D58
C427
MA2S077G0
3 4
22p
D59
IFO10
MA2S077G0
C18
0.01
R536
R207
56
R203 10k
C745
100
470p
A_R3V
A_R3V
Explanatory notes
VOLTAGE LINE
RX LINE
A-AGC
B
B_R3V
B_R3V
R430
C882
10k R435
0.001 L104
47k
R426 3.3µH
R432
C753 680
15k
22p C759 C761
0.001 0.001
D132 R431
MA2S077G0 220k
C758
R434
0.001
180
B_NOISE
Q542
R429 B_RSSI
10k 2SC5006
C766
WFM_CONT 0.01
R433 C760
C762
1k 0.001
100p
D172
MA2S7280G
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-LF
R518
C870
1k 0.01
R437
22k
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
1.6V 100k
3.9k C694
0.1
C878 R515
R513 100k
0.01
C877 X1 CR-593A
220k
C873
0.01 19.200 MHz
220p
C879 Q556
C875 C874
10p
2SC4617
68p 18p D171
HVC350B-E
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
2 R35
47k
15k
C102 C75
C430 R209
0.01 680 0.001 0.001
D60 R36
D61 MA2S077G0 220k
R62
MA2S077G0
180
C431
R208 Q5 C103
0.001
10k 0.01
2SC5006
C101
C202 C73
R34 10p
0.1
1k 0.001
WFM
2.9V
C259
L21
100p
LS-510-LF
R54
22k
CP2
R103
10k
A_R3V
C896
0.01
C264
SSB3V
0.001
C713
R396
0.1
22k
CW R381
D165
330
MA2S7280G 2.6V R382
1.5k
C712 R384
0.1
R379 R380 47k
1.5M
2.7k
C711
0.1
Q530
R385
100k R383
2SC4617
1.5k
B_R3V
B_R3V
C779
R445
0.01
FI8
C775 C776 433 MHz 10k
CFWM450E
10 0.22 3.0V
R444
I O
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 L106
13 B_R3V R448 C781
C782
N-DET VCC
470µH
5 2.2k 220p 220p
12 C784
RSSI IFIN
0.01
11 6
IFOUT DEC
10
7
QUAD FILOUT C773
R451
9 8 0.1 R455
C786 R454
AFOUT FILIN
3.3k 1k
150p 100k
R438
C768
100k C769
IC17
470p R452
470p C785
TA31136FNG 150k
15p R527
4 5 6
10
Q544
R439 R440
1.5k 47k R453 XP6501
D138 150k
MA2S7280G
C770
3 2 1
0.01
C764 AGC
0.001 Q543 R443 C771
R442 C792
470
0.01 15k 0.01 R458
UNR9113G0
1M
CP11
C772
R441
0.001
R436 680
2.2k
C767
DET_OUT
0.22
R462 D139 C795 R466
WFM_CONT
3.9k MA2S7280G 0.1 4.7k
C880
0.001
C794 R464 R465 C797
AGC
0.001 10k 22k 0.001
R463 C796
WFM_CONT
10k 0.22
IC14 IC12
M62366GP CD4066BPWR
A_DET
1 20
VSS GND
2 19 1 14
AO3 AO2 I/O1 VDD
3 18 2 13
AO4 AO1 O/I1 CONT1
4 17 3 12
AO5 DI O/I2 CONT4
5 16 4 11
AO6 CLK I/O2 I/O4
6 15 5 10
AO7 LD CONT2 O/I4
7 14 6 9
AO8 DO R397 CONT3 O/I3
8 13 7 8
AO9 AO12 100k VSS I/O3
9 12
AO10 AO11
10 11
VDD VCC
NB-ON
+3S
2.9V
+3S
C705
R355 R358 R360 R361
C699
Q523 0.1
1.5k 2.2k 150k
1.5k 220p
C697
2SC4617
0.01
R359 220k C700
0.01
Q521 4 5 6
2SC4617
Q525
R362
XP6501 150k
R363 C701
R354 R352 R356 4.7k 0.01
3 2 1
27k 100k 270
R357
C703
330k
0.47
R366
R353 C698 R367
Q522
100k
47k 0.01 220k
2SC4617
C894 R530
4.7k
0.01
SSB3V
C688
0.01
R346
FI6
10k
CFWS450K3
I O
D110 C691
A_R3V 1SS400 0.01
C241
C659
0.22
10
R159
IC2
1k
C221
R49
TA31136FNG
0.01 FI2
10k
CFWM450E C690
16 1
C239
MIXIN OSCIN 0.01
15 2
0.01
GND OSCOUT I O
14 3
N-REC MIXOUT D109 C689
13 4
N-DET VCC 1SS400 0.01
12 5
RSSI IFIN
6
11
IFOUT DEC D108
7
10
QUAD FILOUT 1SS400
C100 C92
9 8
AFOUT FILIN
0.1 0.01
R60
C98 C99 R46
100k L99
470p 470p C686
4.7k C687
470µH
390p 390p
C94
Q41
0.001
R59
R56 R61
UNR9113G0
1.5k
47k
470
R30
R31
C63
C97 3.3k 1k
150p
R55 C64 R177
0.01
100k
2.2k 15p
C96 R116
R57 R58
150k
C242 0.01 15k 680
5
A_R3V 0.22 4 6
R525 R526
C95
R179 10 10
C93
0.001
150k
0.001
D57
MA2S7280G
3 2 1
CP1
Q1 XP6501
SSB3V
C200
C889
CW
0.1 D115 0.01 C62
C717 2.9V
R28
10
RB876W 0.1
R386 1M
C714
R391
0.01 2.2k
R394
10k
27k
C720
Q531 R388
0.01
R392 R373
2.2k
2SC4617
R390 47k 3.9k
D116 27k
R389 RB876W Q532
C707
2.2k
2SK1069-4-TL-E 0.001
C715 R387
R528
0.01 2.2k
2.2k
C716
470p
C890
C718 C719 R393
0.1
0.01 0.001 22k
A_R3V A_R3V
B_R3V
AM/NFM CONT
C780 AM/NFM_CONT
R446
Q553
0.1
10k
XP1113
B_AM FM
C778 D136
4 3
0.01 1SS400 B_R3V +3V
R450
2
10k B_WFMC
D137
5 1
1SS400
WFM_CONT
WFM CONT
C783
R449
0.1
2.2k
B_R3V
B_R3V
B_AMC
R457 D_VCO OUT
C788
4 5 6 C881
47k
0.01 0.001
Q546
XP4312
4 5 6
3 2 1
Q545
XP6501
C793
0.01
C791
3 2 1 AM MODE
10 +3V
B_RXV
B_DET
B_VCO1
R459
C789 C790
470k
0.001 0.01
IC21
CD4066BPWR B_VCO OUT
B_R3V
1 14
I/O1 VDD
2 13
O/I1 CONT1
3 12
AM_DET
O/I2 CONT4
4 11
I/O2 I/O4
5 10
CONT2 O/I4
6 9
CONT3 O/I3
R467 7 8
VSS I/O3
100k
PLLBSTB
ANL_CONT
Q547
BPS
UNR9213G0 O S
A_RSSI
Q535
A_VCO2
D121 DAP222 A_WFMC
XP1113 A_NOISE
3
4 A_NFMC A_VCO1
2 A_R3V
EAR
R398
A_AMC
100k 5 1
LD1
A_DET
CLK
SSB3V SSB3V
BFO
D
+3S
B3C
NBC
Q526 A_R3V
B2C
Q527
UNR9113G0 PLLESTB
UNR9113G0
B1C
NB-ON Q524
1.0V
2SC4617
HFC
R370
STR2
R365
10k
22k
R368 R369 C704
R364
15k 330 0.01
56k
Q528
2SC5006
C893
C702
0.01
0.1
C706 R372
B_RSSI
0.001 100k
B_NOISE
SSB3V +3S
CW
2.9V +3S
Q519
UNR9113G0
LD2
SSB3V
SSBC
B_DET
R347
10k
R529 C692
470 0.01
D113
1SS400
A_R3V
D119
Q534 DAP222
APS
A_AMC
C203 XP1113
R50 C_VCO OUT
0.1
10k A_NFMC
D112
4 3
1SS400
2 A_R3V
R542
15k
5 1 A_WFMC
D111 R172
1SS400
10k
C922
150p
C434
R174
0.1
4.7k
A _ R 3 V A _ R 3 V
C65
R26
0.01
C66
47k
0.01 SSBC
A_R3V
A_AMC
5 6 4 5 6
D117
DAP222
C433
+3V
0.001
3 2 1 3 2
1
A_VCO1
A_VCO2
Q4
Q44 A_VCO3
XP6501
XP4312
R29
C60
470k
C61
0.01
0.001
C709 R377 A _
0.1 4.7k A_DETAM
V P
D114 C710
R378
R374
MA2S7280G
0.001 100k
10k P L
R376
P L
22k
PLLCK
A_ANLC
OSC
Q529
C708
R375
10k 0.22 UNR9213G0
A_R3V
*: Refer to the PARTS LIST for the value and name of component.
23
HJ8
PLLDSTB 1
1
PLLDATA 2
2
PLLCK 3 to 2NDDVCO BOARD
3
J2
+3V 4
4
GND 5
5
OSC 6
6
2NDDVCO
BOARD
HJ9
B_R3V
1
1
GND 2
2
BPS 3
3 to 2NDDVCO BOARD
D_VCO OUT
4 J1
4
GND 5
5
C918
0.001
HJ6
+3V
1
B_RXV
2
B_VCO1 to 1STBVCO BOARD
3
B_VCO2 B_VCO2 J2
4
B_VCO3 B_VCO3
5
B_VCO4 B_VCO4
6
7
B_VCO OUT
8
1STBVCO
C902
47p
C905 C904 C903 BOARD
R541
47p 47p 47p
150
HJ7
VP VP
1
1
GND 2
2
PLLBSTB 3
3
PLLDATA 4
to 1STBVCO BOARD
4
PLLCK 5 J1
5
BPS
6
6
C O S C 7
7
J1
C920
0.001 1
A_RSSI
40 2
A_VCO2
A_NOISE
39 3
A_VCO1
38 4
EAR
A_R3V
37 5
LD1
A_DET
36 6
CLK
BFO
35 7
D
PLLASTB
34 8
B3C
PLLCSTB
33 9
B2C
PLLESTB
32 10 LOGIC
B1C
C402
31 11
0.001 UNIT
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
1
1
GND 2
2 to 2NDCVCO BOARD
APS 3
3 J1
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
C913
0.001
HJ2
+3V
1
2
D179 1SS400
A_VCO1
3
A_VCO2
4
to 1STAVCO BOARD
A_VCO3
5
J2
GND
6
GND
7
8
C908 C907 C914 C906
47p 47p 0.001 47p 1STAVCO
BOARD
V C O O U T A _ V C O O U T
HJ3
V P 1
1
GND
2
2
L A S T B P L L A S T B 3
3
L D A T A P L L D A T A 4 to 1STAVCO BOARD
4
PLLCK 5 J1
5
APS 6
6
7
OSC
7
C917
C916
0.001 0.001