Icom IC-T81E Service Manual page 46

SECTION 11 VOLTAGE DIAGRAM
11-1 LOGIC UNIT
DS4
LM-1782B
+3CPU
C7
0.001
SEG40 76
SEG12
C8
SEG41 77
SEG11
0.1
SEG42 78
SEG10
R10 SEG43 79
SEG9
22 K
SEG44 80
SEG8
SEG45 81
SEG7
SEG46 82
SEG6
SEG47 83
SEG5
SEG48 84
SEG4
R9
SEG49 85
220 K SEG3
SEG50 86
SEG2
IC1
CONT SEG51 87
SEG1
SEG52 88 M38267M8L-231GP [USA-1]
SEG0
+3CPU 89
C9 M38267M8L-230GP [other]
VCC
0.001 90
VREF
91
AVSS
COM1 92
COM3
COM2 93
R12 COM2
COM3 94
47 K
COM1
COM4 95
COM0
96
VL3
97
VL2
98
R13 C2
99
47 K
C1
100
VL1
R14
47 K
C10
0.01
R35
C11
1 K
0.1
C919
0.1
R36 R34 R17
1 K 1 K 100 K
R33
1 K
R39
100K
UP C5
S1005
0.001
E POWER
DN
S1001 S1002 S1003 S1004
VFO MR CALL H/L
8 1
D COM
7 2
S401 C NC
6 3
JPM1990-2013R E A
5 4
COM B
S7
EVQ WRR 001
1 2 3
S1006 S1007 S1008
4 5 6
S1010 S1011 S1012
7 8 9
S1014 S1015 S1016
* 0 #
S1018 S1019 S1020
COMPLETE VIEW
CPUHV
198nS
R151
1K Q151
2SD2216 S
C102
3.2V
0.001
C: 0.6
C: 3.2
R25
1 K
IC142
S-80928ALMP-DAR
C151
0.001
1 2 3
50 KS4
P14/SEG38
R146
49 KS5
P15/SEG39
1 M
48 I2
P16
47 I1
P17
46 KR0
P20
5 4
45 KR1
R51
P21
44 KR2
1 M
P22
C152
43 KR3
P23 0.022
42 ESIO
P24
41 CK
P25
40 DATA
R37
P26
39 PTT 1 K
P27
38
VSS
37
XOUT
36 X1
XIN
CR-639
35
XCOUT
34
XCIN
R26
33 RESET
RESET
4.7 K
32 POWER
P70/INTO
31 RM/MM
P71
30 MICC
P72 C4 C3
29 LIGHT
27 P 27 P
P73
R8
28 BLED
P74 10 K
27 TCON
P75
26 PCON
P76
4
5
6
C12
0.1
Q3
XP4315
R24
1 K
D4
MA2S111
R53
220 K
R333
10 K
+3C
R54 R55 R56
R16 R30 R28 R32 R23
AFON 220 K 220 K 4.7 K
10 K 1 K 1 K 1 K 1 K
R31 R29 R27 R21 R22 C13
1 K 1 K 1 K 1 K 1 K 0.001
POWER
R38
100K
KR3 KR3
KR2 KR2
KR1 KR1
KR0 KR0
I2
I1
BAND1 BAND2
D51
C90 C91 C92 C93
MA132WK
0.001 0.001 0.001 0.001
MA132HK
MA132K
KSD0
KS0
BAND3 BAND4
D52
MA132W
KMA132HK
MA132K
KSD1 KS1
TXFL TXFH
D58
D53
MA6S121
MA132WK
MA132HK
MA132K
KSD2 KS2
RXF1 RXF2
D54 D55
D59 MA2S111 MA2S111
MA6S121 PTT
KSD3 KS3
Inh50 TXInh50
D56 D57
MA2S111 MA2S111
KSD4 KS4
IFS TXF50
D60 D61
MA2S728 MA2S111
KSD5
KS5
C: 13.5
D141
C103
MA2S111
0.001
C718
0.1
D151
R153
MA8100 M R141
47 K
15 K
D152
C101 R154
MA2S111
0.001 10 K
Q141
IC141
UN9210
C: 12.6 Q145
S-81332HG-KC
Q752
2SB1132 R
2SD2216 S
D I
G
D144
R143 C141
MA2S111
C145
10 K 0.001
R148
0.001 C: 13.2
100 K
Q142
XP1501 AB
R142
D143 C756
22 K
MA2S111 0.01
R145
10 K R757
+3C
22 K
C: 3.2
R144
C143 C142
4.7 K
0.001 47
C150 C149 C148 C147 C146
0.01 47 0.001 22 0.1
PCON
+3C
R19
4.7 K
1 8
A0 VCC
2 7
A1 TEST C245
3 6
0.1
A2 SCL
4 5
VSS SDA
R18
IC2 4.7 K
R246
120K
X24320-2.5
R248
470K C243
C240
0.1
0.0015
C246
R247
0.1
100 K
C247
100 P
Q1
3
UN9115
R5 R4 R42
2 IC241
270 270 270
NJM2902V
1
C252
0.0022 R253
56K
DS3
DS1
LT1EP53A
CL-200YG-C-TS
C251
R254
0.001
56 K
C918
0.001
C361
C211
0.047 0.001
R363
R362 R361
470K Q361 IC202
1 M 4.7 K
2SJ364 Q M5222FP
8 1
R215
C362 7 2
4.7 K
0.001
6 3
5 4
C214
C217
2.2
R196 R197
0.1
220 K 10 K
C216
0.1
MC1 R341
D304
EM-140
10 K
RD5.1M B3
Q303 Q341
R321
UN9214 UN9214
C319 R320 C318 3.3 K
0.001 33 K 0.01
R340
R316
10 K
470
C323
C316 0.001
R318
R336
4.7
1 K
10 K
T: 3.2
R335
R: 0
1 K
Q302
2SB1462
T: 0
C324
R: 3.2
0.001
R317
C317 R319
220 K
0.047 2.2 K R315
47 K
C314
0.001
S402
C325
JPM1990-2013R
0.001
R756
100
C719
0.1
Q753
UN9115
R719
R718
12 K
D702
12 K
1SS364
2 1
C754
R755 R753
1 K
470
C753 4 3
0.01
R715
FI701 4.7 K
R754
PBFC450R15DR D701
47 K
1SS364
4 5 C751
R751
10 K
C752
22 P
3 2 1
R716
12 K
Q751
R752
XP1501 AB
330 K
C716
R759
0.1
220 K
R758
47 K R760 C757
C758 C759
1 M 0.22 Q754
4.7 0.001
C755
2SD2216 S
0.047
Q602
C82
0.001
UN9115
4 3
Q603 5 2 WFM
6
XP4312
1
R241
+3C
1 M
R245 R244 R243
82 K 82 K 82 K C241
0.1
C244 C242
0.1 0.039
R242
470 K
R249
220 K
C248
C220
0.1
0.1
R250 R267 R206
100 K 100 4.7K
C250 C249
0.01 0.01 C204
0.001
R251
R252 C253
330 K 0.0047 27 K
C206
R211
100
10 K
C210
10
IC203
R212
22 K TA75S01F
1
5 C209
4
0.001
3
2
R214
100 K
C215 C213
R213
0.1 15
22 K
T: 3.2
R: 0
CTUOUT
R302 R301
R311
10K 56K
10
C302 C301
Q301 C306
C307
0.0047 0.0022
0.001 47
C315 UN9115
0.001 C308 R303
120 P 27 K
C309
R322 0.22
R304
50 K C303
56 K R305
R312 560P
1 8
100
220 K
2 7
3 6
4 5
C310
R314 470 P
100 IC301 R309
C304
4.7 K
0.001
BA4510F
C313
0.0047
R313
R307 C305
100 K
2.2 M 0.0022
C312 C311
4.7
470 P
R310 R308
4.7 K 120 K
R306
100 K
T: 0
R: 3.4
C737
0.01
C714
0.1 R717
C709 C708 1 K
15 0.1
R713
12 K
1
OSCIN
2
OSCOUT
3
C715 MIXOUT N-REC
4
0.1
VCC N-DET
5
IFIN
6
DEC IFOUT
R714 7
R737
FILOUT QUAD
12 K
TBPS1R153K460H5Q 8
FILIN AFOUT
C735
R730
0.1
220 K
IC701
R735
TA31136FN(D)
15 K
C733
C734
C736 0.001
0.001
0.001
R736 R734
15 K 22 K R732
R731
4.7 K
180 K
IC751 C713
R733
0.001
TC4S66F 20 K
R706
10 K
4 5
2 1
3
C720
0.047
IC201
TA7368F C212
150
AFOUT
1 10
2 9
3 8
R201
4 7
10
5 6
C201
R202
C203 0.047
47 P 150
C77
R205 0.001
68
C202
R204
3.3
68
Q201
C: 13.2
2SB1201 S R203
68
VCC
4 5
C: 12.7
C205
47
Q202
XP1501 AB
R208
3 2 1
10K
AFON
R210 R209 R207
C208 C207 C162
12 K 1 K 1 M
0.001 4.7 0.001
R331 R332 R323 R337
220 K 39 K 56 K 470 K
R324
Q307 33 K
UN9214
R325 R326 R327 R338
50 K 50 K 50 K 50 K
Q304 Q305 Q306 Q309
2SJ364 Q 2SJ364 Q 2SJ364 Q 2SJ364 Q
MOD
C326
C320 C321 C322 C328
0.001
0.001 0.001 0.001 0.001
R328 R329 R330 R339
470 K 470 K 470 K 470 K
R+3
C70
0.1
16
MIXIN
15
GND
14
13
12
RSSI
11
10
9
DC-DC
VCC
+3C