Icom IC R8500 Service Manual Addendum page 105

Sep. 2010
MAIN-A UNIT
J17
EXIF
IF
OUT
L1
J1
0.82u
HFIF
FROM RF-C
UNIT J5
J2
V2IF
FROM MIX
UNIT J4
C338
0.1
J3
3LO
FROM PLL
UNIT J4
J4
BFO
FROM PLL
UNIT J6
C358
470p
L28
J5
HF50ACC322513-B
3.18V
GND
(Below 30MHz)
NC
13.8 OE OE
NC
+5
AGC
+8
OE
FROM RF-C
C357
UNIT J4
GND
22p
STBA STBA STBA
Mdat Mdat Mdat
Mck Mck Mck
STBC STBC STBC
GND
GND
L29
100uH
DE
J6
GND STBE
+24
C361
+8
22p
OE
C362
STBF
22p
FROM CONV
STBB STBB STBB
UNIT J1
Mdat Mdat Mdat
Mck Mck Mck
+5
GND
L30
C369
J7 100uH
470p
GND F1
+24 F2
F1 F3 F1
F2 F4 F2
F3 F3
C360
F4 F4
470p
MI5V
SW SW SW
FROM RF-D
UNIT J3
F2M F2M
F1M F1M
+8
LVDA
AGC
-8 LVDA
GND
C359 L31
100uH
470p
FILS FILS
MI5V MI5V LIAD
J8
GND
FILS
C370
MI5V
470p
GND
C371
F1M
FROM MIX 470p
F2M
UNIT J1
+8
GND
-8
GND
L32
100uH
C372
J9 22p
GND Pck Pck
Pck Pdat Pdat
Pdat PDE PDE
POE PSTB PSTB
FROM PLL
PSTB R342 1k LCT1
UNIT J1
C373
LCT
470p
+24
L33
13.8 100uH
L34
HF50ACC322513-B
C374
470p
D48
DAN222
L37
J10
HF50ACC322513-B
13.8 MRXD
L+5 MTXD
GND R475 1k 2 1
FROM DISP GND R476 1k
UNIT J7
MRXD
D47
MTXD 1SS272 3 4
GND
L4
9.87V
R515
100uH
1
3.53V 6.1V R5
330k
D1
R387 C3 Q1 L5
MA862
82 0.047 2SC4081 0.33uH
4 1
L40
3 2
C8 68p 0.33uH
C6
3.94V
0.047
4.3V
L2
617PT-1026
R373
2.2k
R11
C13
0.22 47k 6.86V
2.35V
L7
R10
L3
LS-476 Q2
22
617PT-1026
R504
3SK131
5k
R9 1.19V
1.17V
100k
R103
R102
47k
22
L14 FI3a FI3b L17
LS-479 LS-480
FL-75 FL-75
2.35V
Q15
3K131
R101
1.14V
120
Q8
XP1114
C58
1 5 2p
Q14
2 2SC4081
D5
3 4
1SS272
3 2
4 1
6.94V
C61
0.1
Q9
2SK882
L18
LS-476
R323 R390
47k
2.2k
2.2V
IC32b
NJM2904V
5
7 +
6
R370
-
R190
100k
100
2.36V
7.47V
+ +
IC9a
2.77V
NJM4558M
R509
5
3
1k
1 SMAD
+
2
- C217
4 D23 1SS355
R197 0.0047
2.2M
+
R196
R500
1M
NTCCF20123SH
333KCT
MAIN UNIT
MEASUREMENT CONDITION
DIGITAL MULTIMETER:50ku/V DC
WAVEFORM:OSCILLOSCCOPE(20MHz)
DISPLAYED FREQUENCY:145MHz
MODE:FM
13.8
AGC
MIXV
+8
13.55V
Q5
2SC3650
WFM 7.55V
+
MIXV
2.36V
WFM 1.12V
L9
Q3
LS-476
L8
DTA114EU
Q4
LS-476
3SK131
D2 3.52V
MA862
4 1
WFM 4.31V
3 2
4.30V
3.55V
3 2
4 1
C18
D3
4.32V
0.001
MA862
5.23V D6 5.97V 6.01V
C313
C47 R371
MA862
0.1 0.1
560
2 3 4 1
1 4 3 2
L22
6.94V
LS-476
R70 D7 R78
100 MA862 10k
C79
0.1
D8
MA862
R375
4.15V
1.14V 1 4 4.18V 3 2
10k
2 3 4 1
R74
5.27V
100
D9
MA862
L20
100uH
IC5
+
6.93V L21 LS-476
4.79V
uPC1658G Q11
3
C67 L47 2SK882
5 4 4
SETC VCC 0.1 5.6uH C70
6 3
120p
IN OUT
7 2
BYPS SETE
8 1
BYPS GND 7.58V
Q13
XP4311
6 5 4 4
R85 R91
Q12
R92
5.6k 47k 2SC4081
5.6k
5
+
+
6
R372
1 2 3 470
NB
Q10
R96
ON :0.53V
XP4601
100
OFF:7.59V
+
NRS1
NRS2
FILP
+ 6.91V
IC10a IC10b
C145
NJM2904V
NJM2904V
3 0.047
3.3V
1 5
+
2 + 7
R266
- 6
R204
-
4.7k
IC11b
22k C148
Q62 uPD4001BG
0.01 C149
2SC4081 0.01
5
4
6
+ +
C202 R203 C206 R207
R208
220k 470 220k
470
15k
C143 C147
0.46V
0.0047 0.0047
+5
FI1 FI2
SFECA
SFECA IC2 TK14570L GH
10.7MS2-A 10.7MS-2A
1 20
RFGND RFIN
4.90V
2 19
C25
OSCE GND
3 18
0.0047
OSCC DOUT
+ 4 17
RFVCC COMP WFM
5 16
1.68V
MIXD COMP
L10
6 15
LS-479
IFVCC SQLS
R403
7 14
LMTIN SQLC 10k
R34 8 13
LMTB DET
330
9 12
LMTB FIL
10 11
C33 C34 QDB QUAD
0.01
0.01
0.22
C326
X1
0.01
CDA10.7MC4-4
WFM 1.34V
R35 ERJ3GE-JPW
C36 0.01
C37 5p
CW-N:4.12V
OPTION
FL-52A
J28 J30
J29 J31
CW-N:4.08V
SSB
R111
6.34V
CW
100
AM-N
IC8
uPC1037GR 4.12V
D11
8 1 MA862
CARI VCC FI4
L23 C84
7 2 1 4
FL-65
BYPS OUT1 100uH 0.1
W9
6 3 2 3 1 3
SIGI OUT2
5 4 2 4
R115
GND NC
SSB 220
CW
5
AM-N
3.49V
Q58
R117
AM,
XP4311
100 AM
FM-N
FM-N
1 6
4.05V
4.10V
FIL1
2 5
D13 FI5 FI6
C324
MA862 SFPC455H SFPC455H
0.1
W10
3 4 1 4 1 2 1 2
2 3
R121 C511
3 3
470 0.1
CP2
D10 R123
AM-W
1SS375 100
FM
2
4.08V
1 FIL2
FI7
FI6
C325
SFPC455E-TC01 SFPC455E-TC01
0.1
1 2 1 2 W11
AM-W
FM R127 C312
220 3 3
4.08V 0.1
3
R129
100
2
1
R218 R222
470 47k
IC12a
NJM2904V
8
3
+
1
+
2 5
C150 C153 -
+
4 6
14 0.01 1
D25 -
C154
R210
1SS272
1 0.47 IC12b
10k
3 4 1
2 NJM2904V
3 2
R214
IC11a
R221
uPD4001BG 100k
4.7k
12
11
+
13 D26
DAN222
Q28 R215
IC11d
2SJ144 10k
uPD4001BG
26
1
2
3
4
5
6
7
Q5
R50
2SC4081
47k
Q7
XP1213
8
R36
47k
820 ERJ3GE
R44
Q61
DTC144EU /WFA
!
!
R38
3.3k
C355 C105
0.1
470p
CP1
!
2 3
1 4 !
R452
9
D61
4.7K
MA862
!!6
!!7
!!8
2.34V
6.89V
1.13V
!!9 !
C93
3 2
0.1 Q16
4 1 @0
3SK131
1.13V
D12
"
MA862
@1
3.37V
@2
@3
D14
@4
MA862
3 2
4 1 Q20
DTC144EU R393
22k
@5
@6
+
D18
DAN222 @7
Q23
2SA1586
2.35V
@8
@9
C133
0.047
R399
R181
4.7k
27k
#0
#1
#2
#3
#4
#5
#6
R225
IC11c
Q30
330k
uPD4001BG
DTC144EU
8
10
D27 R227
9
1SS355
1k
7
Q29
XP1213
4.91V
5 1
+
2
4 3
#7
#8
#9
$0
$1
$2
$3
$4