Icom IC R8500 Service Manual Addendum page 174

Feb. 2009
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
FROM RF-C OE
C357
UNIT J4 GND
22p
STBA STBA STBA
Mdat Mdat Mdat
Mck Mck Mck
STBC STBC STBC
GND
GND
L29
100uH
J6 DE
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
FROM RF-D SW SW SW
UNIT J3 F2M F2M
F1M F1M
+8
LVDA
AGC
-8 LVDA
GND
L31
C359
470p 100uH
FILS FILS
MI5V MI5V
J8
GND
FILS
C370
MI5V
470p
GND
C371
F1M
470p
FROM MIX
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
1SS272
MTXD 3 4
GND
L4
9.87V
MAIN-A UNIT 100uH
3.53V 6.1V R5
330k
D1
C3 Q1 L5
R387
MA862
0.047 2SC4081 0.33uH
82
4 1
3 2
C8 68p
C6
3.94V
0.047
4.3V
L2
617PT-1026
R373
2.2k
C13 R11
47k 6.86V
0.22
2.35V
L7
R10
L3
LS-476
22 Q2
617PT-1026
3SK131
R9 1.19V 1.17V
100k
R102
22
L14 L17
FI3a FI3b
LS-479 FL-75 FL-75 LS-480
2.35V
1.14V
Q8
XP1114
C58
1 5 2p
2
D5
3 4
1SS272
3 2
4 1
6.94V
C61
0.1
Q9
2SK882
L18
LS-476
R390
R323
2.2k 47k
LIAD
IC32b
NJM2904V
5
7 +
6
- R370
R190
100k
100
2.36V
7.47V
+
IC9a
2.77V
NJM4558M
R509
5
3 1k
+ 1 SMAD
2
-
4 D23 1SS355
R197
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
R515
Q5
1 2SC3650
+
L40
0.33uH
MIXV
2.36V
WFM 1.12V
L9
Q3
LS-476
L8
DTA114EU
LS-476
D2 3.52V
MA862
4 1
R504
5k WFM 4.31V
3 2
4.30V
3.55V
3 2
4 1
C18
D3
4.32V
0.001
MA862
R103 5.23V D6 5.97V 6.01V
C47 C313
R371
47k MA862
0.1
0.1 560
2 3 4 1
1 4 3 2
L22
6.94V
LS-476
R70 D7
Q15
100
MA862
3K131
R101
120
D8
MA862
R375
4.15V
4.18V
1.14V 1 4 3 2
10k
2 3 4 1
R74
Q14
100
D9
2SC4081
MA862
IC5
+
4.79V 6.93V L21 LS-476
uPC1658G Q11
2SK882
C67 L47
5 4
SETC VCC 0.1 5.6uH
6 3
IN OUT
7 2
BYPS SETE
8 1
BYPS GND
2.2V
6 5 4
R85
R91 Q12
R92
5.6k 47k
2SC4081
5.6k
+
+
R372
1 2 3 470
NB
Q10
R96
ON :0.53V
XP4601
100
OFF:7.59V
+
NRS1
NRS2
FILP
+ + 6.91V
IC10b
IC10a
C145
NJM2904V NJM2904V
3 0.047
3.3V
+ 1 5
2 7
+
R266 -
C217 6
R204
4.7k -
0.0047 IC11b
C148
22k
Q62 uPD4001BG
0.01
2SC4081 5
4
6
+ C202 R203 + C206 R207
R208
470 220k 470 220k
15k
C143 C147
0.46V
0.0047 0.0047
+5
FI1 FI2
SFECA SFECA
IC2 MC3356DW
WFM 7.55V 10.7MS-2A
10.7MS2-A
1 20
RFGND RFIN
4.90V
2 19
C25 OSCE GND
3 18
0.0047
OSCC DOUT
4 17
+
RFVCC COMP
5 16
L10 MIXD COMP
6 15
LS-479
IFVCC SQLS
7 14
LMTIN SQLC
R34
8 13
LMTB DET
330
9 12
LMTB FIL
10 11
C33 QDB QUAD
C34
0.01 0.01
C326
X1
0.01
CDA10.7MC4-4
Q4
3SK131
WFM 1.34V
R35 ERJ3GE-JPW
C36 0.01 C37 5p
OPTION
FL-52A
J28 J30
J29 J31
CW-N:4.08V
R111 SSB
6.34V
100 CW
AM-N
IC8
4.12V
R78 uPC1037GR
D11
10k
8 1
MA862
FI4
CARI VCC
L23 C84
7 2 1 4
FL-65
BYPS OUT1 100uH
0.1
6 3 2 3 1 3
SIGI OUT2
5 4 2 4
C79 R115
GND NC
SSB
0.1 220
CW 5
AM-N
3.49V
Q58
R117
AM,
XP4311
AM
100
FM-N
FM-N
5.27V 1 6
4.05V
4.10V
FIL1
2 5
D13
FI5 FI6
C324
MA862
SFPC455H SFPC455H
0.1
3 4 1 4 1 2 1 2
2 3
L20
R121 C511
100uH 470 3 3
0.1
CP2
D10
R123
1SS375 AM-W
100
FM
3 2
4.08V
4 1 FIL2
C70
120p FI7 FI6
C325
SFPC455E-TC01 SFPC455E-TC01
0.1
1 2 1 2
7.58V AM-W
FM R127
C312
3
4.08V 220 3 0.1
Q13
XP4311
4 3
R129
100
5 2
6 1
R218 R222
470 47k
IC12a
NJM2904V
8
3
+
+ 1
2
C150 C153 -
1 4
14 0.01 D25
C154
R210
1SS272
1 10k 0.47
3 4 1
2
3 2
IC11a R214
100k R221
uPD4001BG
C149 4.7k
12
0.01 11
+
D26
13
DAN222
IC11d Q28 R215
10k
uPD4001BG 2SJ144
27
q
w
e
r
t
y
u
Q5
R50
2SC4081
47k
Q7
WFM
XP1213
1.68V
i
R403 R36
10k 47k
820 ERJ3GE
o
R44
Q61
DTC144EU /WFA !0
0.22
!1
!2
R38
3.3k !3
C355
C105
0.1 470p
CP1
!4
2 3
1 4 !5
R452
D61
4.7K
MA862
!6
!7
CW-N:4.12V !8
2.34V
6.89V
1.13V
!9
C93
3 2
0.1
Q16
W9
4 1 @0
3SK131
1.13V
D12
MA862
@1
3.37V
@2
@3
D14
MA862 @4
W10 3 2
4 1 Q20
DTC144EU R393
22k
@5
@6
+
D18
DAN222
@7
W11
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
5 1SS355 1k
7
+
6 Q29
-
XP1213
4.91V
IC12b
NJM2904V 5 1
+
2
4 3
#7
#8
#9
$0
$1
$2
$3
$4