Icom IC-R75 Service Manual page 48

2.5 V R825 R816
Q801
D763 NTCCM16083NH 681KC 2.7 k
_ 5 V
MA77 2SC4081 R
7.7V R817
2.7 k
C811
R764
0.0047
2.2 k R811
D764 1 14
1.5 k +SI VEE
MA77
2 13 R821
1.9 V GAIN NC
3 12 3.3 k
R765
GAIN -OUT
2.3 V
10 k R802 4 11 R820
-SI NC
100 5 10 1 k
BIAS -CI
R801 6 9
+OUT NC
62
7 8
1 k
NC +CI
D773 R815
IC811
MA77
3.3 k
C801
MC1496D
0.1
R774
R812 R813 R814
2.2 k
D774 470 470 3.3 k R818
R823
2.7 k
MA77
10
R822
R775
7.9 V
10 k 10
C813
C814 R819
0.1
0.1 1 k
72
L
D783
MA77
R784
2.2 k
D784
MA77
R795
4.7 k
82 R785 C792 R794 R796
10 k 0.1 2.2 k 2.2 k
C831
0.0033
R831
4.7 M
R833
4.7 M R832
0.6 V
R836 4.7 M
9
4.7 k
8
10
R834
IC1211C
4.7 M
NJM2058M
R835
1.5 M
D831
1SS302
IC1201
3BU4052BCFV
IC1211A IC1211B
NJM2058M NJM2058M
41 J1221
0 V
R-4 B4B-PH-SM3-TB C1217
0.1 C1211
C1213
DAFO
1 1 4 2 6
0.0033 0.0015
AFE 1 7
2 2
3 5
3 3
11
R1215 R1214 R1213 R1212
4 4
C1215
C1216 39 k 39 k 39 k 39 k
0.1 0.1
C1212
C1214
0.0012
560 P
_
5V
5V
8V
14V
H5V
FI851 Q891
D851 D852 L891
C841
FL-65 R892
LS-450
MA77 MA77 3SK131 MAS
0.0047 100
I O
C892
0.0047
2.8 V R851
R854
10 k
10 k 2.7 V
R853
C891 R891
220 R894
0.1 10 k
3F3K 22 k
R893
C893
R852 2.2 k
220 C851 C852 R855 0.0047
0.1 0.1 10 k AGC
FI86
D861 D862
FL-65
MA77 MA77
R8V
I O
5V
C818
L1001
R861
0.1 R864 220 µH
10 k R1007
10 k
220
R863
220 2.6 V
C1010 R1002
3F6K
0.1 100
R862
220 C861 C862 R865
0.1 0.1 10 k Q1001
R1008
2SK882 GR
220 k
FI871
D871 D872
FL-65
MA77 MA77
I O
0 V
R871 R1001
R874
3.9 k 4.7 k
3.9 k C1001
0.1
R873
220
3F15
R872
FMAF
220 C871 C872 R875
0.1 0.1 10 k
OPTIONAL
D881 D882
FILTER
MA77 MA77
2 1
4 3
R841 R881
R884
10 k 3.9 k 3.9 k
R883
8V
220
3F0P
R882
220
C881 C882 R885
0.1 0.1 10 k
4 3
5 2
6 1
AGC
R8V Q1066
14V
XP4311
8V
AGC
5V
5V
C1201 C1090
R1084
16 0.1
0.01 47 k
13 X0 12 R1201 68 k SSAF
X
X1 14 R1202 2.2 k FMAF
C1089
3 X2 15
Y 0.0047
11 R1204 47 k EAAF
X3
R1205 47 k SAAF
1 8V
Y0
5
Y1
2
Y2
4
Y3
6 SQLS
INH
10 AFS1
A
9 AFS2
B
8 7
R1211
47 k
C1202
0.01
_
5V
8V
5V
SAMS
8V
5V
SALI
H5V
R1772
R1771
33 k
6.8 k
Q1771
F1352 F1353
S-N5054 #01 S-N5054 #01 2SA1576 R
FUSE
HOLDER
8
1 7
0 V
4
C1771
0.1
IC1771A
TC7W04F
7.5 V L911
7.4 V
L892 LS-450
Q911
LS-450
2SK882 GR
0 V
R896
3.3 k 7.5 V
1.5 V
C897
R912
0.4 V
0.0047 2.2 k
R898
R913
C912
10 k
C895 100
220 P
22 P
R897
Q912
100
C913
R911 2SC4081 R
C911
C894 R895 C896 0.1
0.1 100
0.1 330
0.1
1 16 X1001
OSCIN MIXIN
2 15 CDB450C24
OSCOUT VSS
3 14
C1002 MIXOUT NOUT
R1006
4 13 8V
0.0047 VDD NDET
C1007 1.5 k
5 12
IFIN SOUT 100 P
6 11
BIAS IFOUT *4.8 V
7 10
FILOUT QUADIN
8 9
FILIN AFOUT
R1003
C1005 IC1001
150 k C1008 C1009
220 P
10 0.1
C1004 TA31136FN
220 P
R1005 C1006
R1004
C1003 220 k 0.0047
3.3 k
C1051
0.1
10
R1022 R1021
13 39 k 10 k
C1023
14
0.01
12
C1024
0.1 R1023 C1022 C1021
R1024
IC1211D
68 k 0.01 0.12
47 k
NJM2058M
AGOS
C1061
0.0047
R1064 Q1061
680 k
XP4311
4
C1065
R1063
4 3 4 3
10 R1062
1 k 5
22 k
R1065
5 2 5 2
4.7 k 6
C1067
R1068 R1067
6 1 6 1 22
10 k 330 k Q1063
R1066
2SC4081 R
Q1065 Q1064 22 k
C1066
2.2
XP4311 XP4311
C1064
0.1
_ 5V
C1081
0.0047
R1082 1 14
+SI VEE
1 k 2 13
R1102 GAIN NC
R1111
3 12
1.5 k C1085
GAIN -OUT 10
4 11
0.0047
-SI NC
5 10
BIAS -CI
6 9
+OUT NC
7 8
NC +CI R1109 R1081
220
1 k
R1105 IC1101 R1110 _
5.0 V
R1101 R1103 R1104 2.2 k
2.2 k
MC1496D
1 k 1 k 3.3 k
R1107
R1106 R1108 C1103
1.5 k
10 1 k 0.1
7.9 V
C1101 C1102 1
ENV DET
2
0.1 0.1
DECODER IN
3
REF
C2001
4
AGC
0.001
5
IF IN
6
C2012 SS
L2011 C2011
7
330 µH FIL L OUT
330 P 33 P
8
L NOTCH IN
9
FEEDBACK
R2001 R2011
R2002 10
10 k UNFIL LOUT
10 k 220
11
UNFIL ROUT
12
FEEDBACK
13
AMIF R NOTCH IN
R2012
14
C2013
FIL R OUT
GND 100 k
10
IC2001
C2014 C2015 C2016
MC13022ADW
10
0.1 0.01
SAAF
EAAF
SAMS
8V
5V
SALI
5.0 V
L1771
220 µH
H5V
CIVE
4.5 V
D1771
1SS355
C1751
Q1772
10
2SC4081 R
1 16
C1+ VCC
2 15
V+ GND
3 14
C1752
R1773 C1- T1O
10 4 13
47 k C2+ R1I
R1774 C1753 5 12
C2- R1O
15 k
10 6 10
3 5 V- T1I
7 11
T2O T2I
C1754 8 9
2 6
R2I R2O
10
IC1771C
0 V IC1751 C1755 C1756
TC7W04F
10 0.1
IC1771B
DS14C232TM
TC7W04F
C816
0.0047
0 V
R914
C914
10 k
2.2 3LO
R915 R824
10 k 220
*2.6 V 7.1 V
R1031
R1032
220
220 k
*3.0 V D1051
1SS375
4.0 V
R1051 Q1031
2.7 k
2SC4081 R
R1052
4.7 k R1053
470 3.4 V
Q1051
C1502
2SC4081 R
0.0047
C1031 R1033
0.1 1 k
* RF GAIN: MAX
D1061
1SS375
DRES R1231 470 DRSR
1
DINT R1232 470 DITR
2
DSTB R1233 470 DST
3
MDAT R1234 470 MDTR
4
MCK R1235 470 MCKR
5
5V 5V
6
DSPS R1236 470 DSSR
7
GND
8
GND
9
GND
3 10
C1231
2
0.0047
1
R1061
C1062
100 k 100 P
MDAT SPST
1 2
BUSY MCK
3 4
5V SPCE
C1063
5 6
GND SPCH
10
7 8
BFO
S-AM:
1.3 V
2.8 V
278 µs
0 V
Other: 0 V
C2031
0.001
C2032 C2033 C2034
0.001 0.001 0.001
28
I DET
27
L-R DET
26
Q OUT
25
VCC
24 X2021
C2024 47
LOOP FIL 7.6 V
23 CSA3.60MGF103
BLEND
22
GND
STREO LAMP 21
Q2021 C2035 C2036
OSC FEEDBACK 20
0.1
0.1
19 DTC114EU
OSC IN
18 L2041
PILOT DET IN
220 µH
17 R2021
I PILOT
Q PILOT 16 3.9K
SS OUT 15
R2022 C2021 C2022 C2023 C2041 C2042 R2031 R2032
1 k 0.001 39 P 12 P 10 0.1
47 k 47 k
R2051 S-AM: 0 V
47 k Other: 4.8 V
C2051
2.2
At receved: 4.5 V
Other: 0.1 V
CIV
CIVE
CI-V
_ 10.0 V
0 V
5
9
4
8
3
7
2
6
1
CP1762
CP1761
COMPLETE VIEW
OPTIONAL
UNIT
UT-102
OPTIONAL
UNIT
UT-106