Icom IC-V8 Service Manual page 27

SECTION 12 VOLTAGE DIAGRAM
J5
PSVCO
16
SCK SCK R362
10k
C72 R48
15
OPV1 OPV1
1 10k
17 DTC
SI SI
14
OPV2 OPV2
FC
18
SO SO
R50
C70
13
OPV3 OPV3 470k
0.001
19
CIRQ CIRQ
12 GND
20
CCS CCS
11 OPT3
OPT3
21
REM
10
OPT2 OPT2
22
AFOUT
TO 9
OPT1 OPT1
OPTIONAL 23
DISCIN
UNIT
8 SICO SICO
24
7
25
R136
100 F (DET)
6
26
5
27
4
MICIN MICIN
28
3
MICOUT MICOUT
29
5V 5V
2 PTTOUT PTTOUT
30
GND
1
PTTIN PTTIN
C223
0.01
7.20V
VCC VCC
BATT
C400 C283 C305 C173
0.0022 0.0022 470p 100 IC12
GND
S-81350HG-KD
I O
R331 C282
6.60V
G
10k 0.001
Q55
5 4
2SB1132
Q57
4.97V
XP1501
1 2 3
4.43V
C380 C379
ON: 4.87V
22
0.001
OFF: 0V
R332 Q56
4.99V
4.7k
R335
UN9213
1M
D39
MA2S111
4.99V
C377 C378 R330
C376
C381
22 10k
0.1
0.001 10
C385
R334 R333
0.1
S801 1M 1M
ENCODER
UP
E
DN
D45
S104 S105
MA2S111
D40
UP DN
[USA] only
MA2S111
S108 S109 S110 S111 D46
D41 MA2S111
1 2 3 P0
[USA] only
MA2S111
S112 S113 S114 S115
4 5 6 P1 D42
MA2S111
S116 S117 S118 S119 D48
D43 MA2S111
7 8 9 P2
MA2S111 [USA] only
S120 S121 S122 S123
0 # P3 D44
MA2S111
VCC
T5
R5
SW5V
PSVCO
X1
R355 C394
CR-659
R49 C69
W13 220k 0.1
21.250 MHz
47k 68p
Q59
2SC4116
C395
D7 C64
1.34V 18p
HVC376B 8p
C396 R354 C397
33p 2.2k 4p
PLCK
SO
PLST
R164
100k
W8
UNLK
W9
R185 1k
C234
0.001
Q34
2SK1069
PS5
CP1
R5
EP3
MMZ1608Y102BT
LVIN
C388 C387
C233 R186 22p 47p
47k
0.001
C389 0.001
FI2 SFPC450E
O
G
C121
R88
220p
33k
R86
47k
R87 C122
2.2k 220p
SW5V
VCC
DISCIN
PS5
R131 C154
D
470
10
PTT
C147 R130
C209
0.047
100k
TX: 4.82V Q17 0.1
RX: 0V UN911F
MICIN
MICOUT
SW5V
CPU5
DEV
VCC
SQLIN
4.92V R150
470
T1
T2 T2
DICK OPV1
SCK
SO
DIUD
T3 T3
C244 C236
ISO 0.01 0.01
TX: 4.67V, RX: 0V
R5
T5
SW5V
Q22
Q54
2SA1576
2SA1576
R260
R328
10k
100k
TX: 4.21V
RX: 4.99V
C375 R329 R141
C398 C162
0.001 47k 4.7k
4.7 0.01
R239
1k
4.35V
KS4
PCON
R238 1k
KS3
KS2
KS1
S1 S2
KS0
KR3
R240
R348
KR2
1k 1k
KR1 S1 S2
KR0
12 - 1
Q11 XP4601
4.68V
R337 4 3
1.8M
5 2
1
6
1.45V
R353
C300
10k
R30 4.75V 0.001
C301 C50
4.7k
0.001 3.3
0.76V L14
82nH
C30
R41
C61 C62 22p
100
1 16 12p 9p
XIN XOUT
15 C60
2
CL OUT
0.001
3 14
DI PE
4 13 TX: 0V, RX: 4.53V
CE VCCD
5 12
VCCR GNDD
6 11
PI PDN R35
7 10
GNDR PDP 100
C55 8 9
TEST CP R352 R361
0.01
270k 1M
C54
C293 IC1 LV2105V
0.001 R33
6 5 4
R184
0.1 220
10k
C48
1 2 3
10
R360 2.7k
EP4
C290 0.001
MMZ1608Y102BT R300 10k
R84
390
C386 R301
22p 680
R85
C117 R244 X3
1.5k
0.001 100k CDBCA450CX24
1 MIXIN 16
OSCIN
2 15
OSCOUT GND
3 14
I MIXOUT N-REC
4 13
C116
VCC N-DET
5 12 82p
RSSI
IFIN
6 11
DEC IFOUT
7 10
FILOUT QUAD
8 9
FILIN AFOUT
C114 C113
IC2 TA31136FN
0.033 0.001
C120 C118 C119 C303
0.001
0.1 0.01 1
NOIS SD
DET
IC3
TX: 2.79V
R177
RX: 4.97V
NJM12902V 1k
C304
C132
C
0.047 C124
C217
0.0056
10 0.01
0.1
8
9
R137
R266
100 C134 220p
15k R104 R105
100k 470 R93
R176
27k
3.9k
C133 R108
0.1 150k
DET
VOLIN
SQLIN
VOLOUT
C123
0.001
1 24
VIN1 VIN8
2 23
VOUT1 VOUT8
3 22
VOUT2 VOUT7
4 21
VIN2 VIN7
5 20
R227
VDD GND
6
19 12k
LD R224
RESET
7 18
CLK VDAREF 120k
8 17
DI DO
9 16
VIN3 C219
VIN6
10 15
C216 0.01
VOUT3 VOUT6
11 14
0.047
VOUT4 VOUT5
12 13
VIN4 VIN5
IC10
M62363FP-650C
R320
TX: 0V C249
Q21 0.01 15k
RX: 4.88V R326
2SA1576
68k
C369
R319
0.033
68k
R261
47k R318
TX: 4.97V
68k
RX: 4.27V
C161 R139 C174 C373 C370
0.01 22 0.0068 0.0018
10k
DC POWER SUPPLY: 7.2 V
MAIN UNIT
MEASURMENT: TESTER (INNER RESISTANCE MORE THAN 50 k‰/V)
TX: 1.99V
RX: 0V
4.00V
R21 R310
1k 47k
C32
R306 R20 C363 R311
0.001 180k 47k
330 0.001
Q51
2.33V
DTC144EU
R313
1k
Q5
R302
2SC4406
10k
R264
68k
L33
LB-277
C295 C360 D37
R351 C392 0.001 0.001 MA2S077
C393
82 10
33
R32
R314 C361
390
4.7k 0.001
Q58
XP4601 L34 D38
C47
C364
HVU350B
0.47 2.7 H
27p
0.71 V
R81 C111
R77
470 0.01
100
TX: 0V
R80
RX: 3.26V
82k
C108
W12
0.01
R82
C115 C391 TX: 0V
1.8k 0.01 22p
RX: 0.74V
FI1 FL-298 FI3 FL-298
21.700 MHz 21.700 MHz
R79
1k
Q14
C110
2SC4406
5p
R83
C112
470
0.001
1
I/O VDD
R95 1.5M 2
CONT. A
C125 O/I
3
0.0022 O/I CONT. D
4
I/O I/O
6
5
7
CONT. B O/I
6
5
C126 CONT. C O/I
R257 7
0.0027 I/O
VEE
1
R94
IC3 NJM12902V
1M IC4 BU4066BCFV
C197 R148
0.1 100k
3 2 1
R359
1M
Q38
IC11
DTC144EU
S-80942ANMP-DD6
4 5
C230
0.027
Q53
XP4601
R321 R336
10k
100k
4 3
5 2
6 1
R327
100k
R323
R324 R325 C372 C374
10k
1.2k 68k 0.022 0.0022
VCC
T5
R305
100 R23
680
2.46V
R304 C357
220 0.001
0.96V 1.21V
C356 0.001
C29
0.001
C33
0.74V R309 8.2k
0.001
R303
220
C367 1 6 R18
1.83V
0.5p 39k
5
2
0.74V
3 R22 R307
4 C358
68k 390
0.001
R315 Q50
C368
8.2k
C28
UMX5 0.5p
12p
C31
5p
C365
2.77V
0.75p
0.73V Q6
2SC4406
PS5
R5
TX: 0V
RX: 4.55V
C102
L21
56p
47nH
L20
C107 C106
2.2 H
0.001 22p
L29 C101 C100
68nH 56p 39p
R262
680
Q13
TX: 0V 3SK274
RX: 0.74V
R72 L36 R70
R75 C105 C104 10k 2.2 H 100k
220 0.01 0.001 TX: 1.9
RX: 1.6
SW5V
VCC
PS5
14
R44
13 C128
10k
12 0.1
11
10
9
R112
8 C131 1M
R169 R170
0.01
39k 10k
CLIN
SD
SW5V
CTCSS
CPU5
CTCC
VCC
VOLIN
CTCIN
VOLOUT
R103
12k
Q43
DTC144EU C195
56p
C144
0.001
R226
1k
SCK
SO
NOIS
R232
1k
PLCK
C
5
C21
C21
C21
C19
8p