Icom IC-U82 Service Manual page 28

SECTION 11 VOLTAGE DIAGRAM
• MAIN UNIT
LIGHT ON: 3.50V
OFF: 4.40V
VCC
DS2
DET
LNJ310M6URA
SW5V
DS3
LNJ310M6URA
R500
330k
Q25
2SC4116
LEDC
R204
10k
R155 R205
4.7k
100
CPU5
R502
LIGHT ON: 5.00V
1k
OFF: 0.00V BATT
C531
R501
0.01
C197
240k
0.1
R148 R182
47k
100k
R494
IC21
1k
R181 C232
BD5242G
100k 0.1
RESET
C144
0.001
C527
0.001
C526 C525
C524
C230 0.001 0.001 0.001
0.023
LEDC
C296
PTT
470p
R398
C424
MICS
100k
0.01
AN
DIGI
D56
C297 UN_SEC
HVC376BTRF
0.01
CSHIFT
R103 12k
CNVSS
R475 47k
RESET
C195
56p
R102
R474
X2
10
47k
CR-793 NOIS
(9.8304 MHz)
C514
C515 R246
R245
2.2
0.1
10k
100k
OPSO
R101
SI
1M
C193 C194
SECRET
0.5p 8p
BUSY
IC7 R346
100k
S-24CS64A0I C245
0.01
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
VSS SDA R225
100k
R228
10k
7.20V
CPU5
VCC
BATT
IC12
C400 C305 C282 C283
R331
S-812C50AMC
0.0022 470p
10k 0.001 0.0022
GND
Q55
Q57
5.05V
2SB1132
XP1501
SW5V
C380 C379
4.50V 22 0.001
Q56
UNR9213J
R332
6.8k
5.00V
R335
1M
D39
1SS400
R330
10k
C376
C377 C378
0.001
C385 R334 R333
22 0.1
0.1 1M 1M
S801
UP
E
DN
CTCSS
R491 R195 R194
220k 56k 56k
R224
39k
Q38
R193
R196
UNR9213J 56k
10k
C216
0.0039
C219
R227
CPU5 0.033
3.9k
C199
0.1
R492
R493
1k
1k
LVIN 1
P96/AN6
2
P95/AN5
REMO 3
P94/AN4
SD 4
P93/AN3
CTCIN 5
P92/AN2
BATT 6
P91/AN1
DET 7
P90/AN0
8
P87/TA7IN
PTT 9
P86/TA7OUT
MICS 10
P85/TA6IN
AN 11
P84/TA6OUT
DIGI 12
P83/TA5IN
UN_SEC 13
P82/TA5OUT
14
P81/TA4IN/INT5
CSHIFT 15
IC8
P80/TA4OUT/INT5
CNVSS 16
CNVSS
M30220MA-135RP
17
XCIN
18
XCOUT
RESET 19
RESET
20
XOUT
21
VSS
22
XIN
CPU5
23
VCC
24
P77/NMI
PWRSW 25
P76/INT2
26
P75/INT1
INT0 27
P74/INT0
28
P73/CTS2/RTS2
29
P72/CLK2
CLIN 30
P71/RXD2/SCL
31
P70/TXD2/SDA
32
P67/TXD1
33
P66/RXD1
34
P65/CLK1
35
P64/CTS1/RTS1/C
36
P63/TXD0
CLOUT
PWRSW PWRSW
CPU5
VCC
C173
100
CPU5
4 3
NC VOUT
R240
2
VIN
1k
5 1 C381
NC GND
10
SW5V
D45
PWR 1SS400
S125
UP S104 DN S105 MON S124 D40
Except
1SS400
[EX1], [EX2]
BAND4
D46
1SS400
A S108 B S109 C S110 D S111 D41
[EX1], [EX2],
1SS400
[EX4]
D47 BAND3
1SS400
1 S112 2 S113 3 S114 # S115 D42 [KOR], [EU3],
1SS400
[EX4], [US3]
D48
1SS400
BAND2
Except
*
S116 S117 S118 S119 D43
4 5 6 [EX1],
1SS400
[EX2]
D49 BAND1
1SS400
S120 S121 S122 S123 D44
7 8 9 0 [EU1], [EU2],
1SS400
[KOR], [EU3]
DICK
DIUD
VCC
CPU5
DET
CTCSS
VCC
CPU5
DET
CTCSS
SW5V
DS4
LCD A01B001X
SEG25 29
S25
SEG24 28
S24
SEG23 27
S23
26
SEG22
S22
SEG21 25
S21
SEG20 24
S20
23
SEG19
S19
SEG18 22
S18
SEG17 21
S17
20
SEG16
S16
SEG15 19
S15
MAIN UNIT
SEG14 18
S14
17
SEG13
S13
SEG12 16
S12
SEG11 15
S11
14
SEG10
S10
Explanatory notes
SEG9 13
S9
SEG8 12
S8
SEG7 11
S7
SEG6 10
S6
SEG5 9
S5
SEG4 8
S4
SEG3 7
S3
SEG2 6
108 SEG20 S2
SEG19/P103
SEG1 5
107 SEG21 S1
SEG20/P104
COM1 4
SEG22
106 C1
SEG21/P105
COM2 3
105 SEG23 C2
SEG22/P106
COM3 2
104 SEG24 C3
SEG23/P107
COM4 1
SEG25
103 C4
SEG24/P110
102
SEG25/P111
101
SEG26/P112
100
SEG27/P113
99
SEG28/P114
98 DIUD
SEG29/P115
DICK
97
SEG30/P116
96
SEG31/P117
95 R473
SEG32/P120
JPW
94
SEG33/P121
93 [EX1], [EX2]
VSS
[EX4] only PS5C
92
SEG34/P122
91
VCC
90 KS0
SEG35/P123
89 KS1
SEG36/P124
KS2
88
SEG37/P125
87 KS3
SEG38/P126
86 KS4
SEG39/P127
IR1
85
SEG40/P00
84 IR0
SEG41/P01
83 TXC
SEG42/P02
R5C
82
SEG43/P03
81 DIGI_W
SEG44/P04
80 T5C
SEG45/P05
EMPHASIS
79
SEG46/P06
78 UNLK
SEG47/P07
77 PWRON
P10/KI0
76 KR0
P11/KI1
75 KR1
P12/KI2
74 KR2
P13/KI3
73 KR3
P14/KI4
C425
0.01
VCC
SW5V
PWRON
J5
VCC
30
1 PTTI
GND
29
2
PTTO
+5V
28
3 MICOUT
VOUT
27
4 MCIN
26
5
SW5V
232TX EP6
25
6 BUSY
232RX
24
7
EP7
RX_MUTE
To
23
D70 OPTIONAL 8 SICO
1SS400
unit
22
9 OPT1
AFOUT
D69 21
10 OPT2
1SS400
REM
[EX1], [EX2],
20
11 OPT3
[KOR], [EX4]
CCS
19
12 GND
D68
18
1SS400
13 OPV3
Except [US1],
OPSO
17
[US2], [US3]
14 OPV2
SI
16
D67 15 OPV1
1SS400
OPSCK
Except [US1],
[US2], [US3]
KS4
J7 EP10
D66
KS3 232RX
1SS400
KS2
[EX1], [EX2],
KS1
[EX4]
KS0
DATA EP9
232TX
KR3
KR2
KR1
EP11
KR0
DET
SW5V
C412
0.01
R377
180k
IC23
LMV321IDCKR
1
R378
3
47k
IC16
SN74AHC2G53HDCTR
R521
JPW
8 1
VCC COM
7 2
Y0 INH
R379
6 3
Y1 GND 100k
5 4
A GND
R507
100k
C541
5
1
VOLTAGE LINE 0.1
R511
4
180k
TX LINE 3
1
I/O1
RX LINE 2 R509 2
O/I1
470k 3
O/I2
4
COMMON LINE I/O2
IC25
5
CONT2
R510 R508 6
LMV321IDCKR
CONT3
100k
47k 7
VSS
MCIN
MICOUT
PTTO R386 47k
+5V
OPV3 R479 100k
OPV2 R478 100k
OPV1 R164 100k
OPT1
R482 1M
OPT2
R483 1M
OPT3
R484 1M
VCC
DIGIT ON: 5.00V
OFF: 0.00V
OPT ON: 5.00V
Q61
OFF: 0.00V
2SA1576
Q62
2SC4116
+5V
D51
R363
C401 C402 1SS400
3.3k
0.01 0.1
VOUT
R382 47k
C404
10
R136 100
AFOUT
RX_MUTE
R485 1M
R381
47k
SW5V
C517
R480 C414
0.001 1
DET 100
IC14
IC13
CD4066BPWR
CD4066BPWR
1 14 1
I/O1 VDD
2 13 2
O/I1 CONT1
3 12 3
O/I2 CONT4
4 11 4
I/O2 I/O4
5 10 5
CONT2 O/I4
6 9 6
CONT3 O/I3
7 8 7
VSS I/O3
PTTI
C409 R373 R374
1 680
10k
R371
C410
1k
0.1 IC17
AN6123MS
BUSY
3 2
INPUT DET
4
C411 GND
5 1
R372
0.1 OUTPUT VCC
5.6k R375
1M
OPT1
OPT2
OPT3
CCS
R477 10k
C407 C408
OPV3
10 0.001
OPSO
OPV2
R476 10k SI
OPV1
R362 10k OPSCK
SICO
11 - 1
PLLSW
PLLSW
VCC
CPU5
PSVCO
CTCSS
SW5V
VCC
SW5V
SW5V
R369
1M C413
Q64 0.001
2SA1576A
R370
A
5 470k
4
2
REFMV
R380
470k
R512
47k
DTCS DTCS
CTCSS CTCSS
IC15
CD4066BPWR
14
VDD
13
CONT1
C416
12
CONT4 0.001
11
I/O4
10
O/I4
9
O/I3
8
I/O3
R384
33k
MODIN
MODIN
DIGI
R385
47k
+5V
C405
0.001
R364
10k
D5VC
IC22
S-812C50BMC
O/I4
RX_MUTE
O/I3
OP_PS
CPU5
SW5V CPU5
MIC
MIC
C415
0.001
DET
I/O1
14
I/O1 VDD
13
O/I1 CONT1
AN
12
O/I2 CONT4
11
I/O2 I/O4
10
CONT2 O/I4
9
CONT3 O/I3
8
VSS I/O3
SECRET
THROUGH
UN_SEC
ALC
DI_SEC DET
C406
10
Q63
2SA1576A R376
100
R367
1M
R368
220k
THROUGH
SICO
B
+5V
+5V
23