Icom IC-4088E, Service Manual

Page: 26 / 29

SECTION 11 VOLTAGE DIAGRAM
11 - 1
11-1 MAIN UNIT
*: EXT-PTT
T: 2.30
R: 3.10
T+3
[BP]
DC.IN
EXT.SP
MIC
EXT-DC: 0.32
CHG: 2.99
T: 2.09
R: 0.00
T: 2.99
R: 0.00
T: 0.00
R: 0.00
C: 2.99
C: 3.10
T: 0.00
R: 2.73
T: 0.00
R: 1.91
EXT-DC: 5.98
EXT-DC: 5.73
BP: 4.50
T: 0.00
R (BP): 4.50
R (EXT-DC): 5.73
*: at INT-PTT
T: 2.99
R: 0.00
T: 2.72
R: 0.00
T: 2.73
R: 0.00
*: EXT-PTT
T: 3.06
R: 0.00
C: 1.55
C: 1.57
C: 1.81
Q305
2SC4116 GR
D303
MA2S111
D304
MA2S111
D302
MA2S111
IC302
R3112N281A
1
OUT
2
VDD
3
VSS NC
4
CD
5
Q311
2SC4213 B
Q306
2SC4116GR
R385
1
Q316
2SJ144 Y
MC300
Q317
DTC144EU
Q302
DTA114EU
DS301
CL-200YG-C-TS
R348
240 k
J302
04-730A1-02BKA
X300
CR-465
R365
NTCG16 3NH 221KT1
C347
10
Q309
DTC114TU
Q310
DTA113ZU
Q313
2SK1829
J303
HSJ1102-01-540
C316
0.22
R406
RV-244
J301
HSJ1493-01-010
SP300
SDRD-3650P-008
C358
150
+
IC305
NJM2070M
1 1
2
2
3
3
4
5
6 6
7 7
8 8
Q307
2SA1362 GR
Q304
2SA1586 GR
Q303
UMZ2N
1 2 3
4 5 6
Q308
2SB798 DK
Q315
HAT1023R
5
D
6
D
7
D
8
D
1
S
2
S
3
S
4
G
D305
SB07-03C
D308
MA133
C328
100
+
C354
22
C337
0.22
D307
MA2S728
D306
RB551V-30
Q312
DTC144EU
EP300
Q314
2SB1132 Q
IC301
UPD78F9418AGK-9EU
1
VDD1
2
BIAS
3
VLC0
4
VLC1
5
VLC2
6
VSS1
7
COM0
8
COM1
9
COM2
10
COM3
11
S0
12
S1
13
S2
14
S3
15
S4
16
S5
17
S6
18
S7
19
S8
20
S9
21
S10
22
S11
23
S12
24
S13
25
S14
26
S15
27
P93/S16
28
P92/S17
29
P91/S18
30
P90/S19
31
P87/S20
32
P86/S21
33
P85/S22
34
P84/S23
35
P83/S24
36
P82/S25
37
P81/S26
38
P80/S27
39
AVDD
40
AVREF
41
P66/AN16
42
P65/AN15
43
P64/AN14
44
P63/AN13
45
P62/AN12
46
P61/AN11/CMPREF
47
P60/AN10/CMPIN0
48
AVSS
49
P27/INTP3/CPT5
50
P26/INTP2/TO5
51
P25/INTP1/TI1
52
P24/INTP0/TI0
53
P23/CMPTOUT0/T0
54
P22/SI/RXD
55
P21/SO/TXD
56
P20/SCK/ASCK
57
P53
58
P52
59
P51
60
P50
61
P03
62
P02
63
P01
64
P00
65
P47
66
P46
67
RESET
68
X2
69
X1
70
VSS0
71
VDD0
72
XT2
73
XT1
74
IC
75
P45/KR5
76
77
78
P44/KR4
P43/KR3
P42/KR2
79
P41/KR1
80
P40/KR0
D309
MA2S111
D310
MA2S111
D313
MA2S111
W305
R415
NTCG16 4LH 473KT
Q318
DTC114YU
D317
MA2S111
IC304
AK2342B
1
TXINO
2
TXIN
3
AMPP
4
AMPN
5
AMPO
6
SPOUT
7
MODIN
8
MOD
9
AVSS
10
DEOUT
11
RXAFIN
12
RXAF
13
DVDD
14
RSTN
15
STB
16
SCLK
17
SDATA
18
XIN
19
XOUT
20
TOUT1
21
TOUT2
22
DETOUT
23
COMPO
24
DVSS
25
COMPN
26
COMPP
27
AVDD
28
TSBPFO
29
DREF
30
TLINO
31
TLIN
32
RXTONE
33
TXTONE
34
DCSINO
35
DCSIN
36
TAGND
37
AGNDIN
38
NC
39
AGND
40
RXIN
41
RXINO
42
LIMINO
43
LININ
44
TXOUT
45
LIMLV
46
LIMBS
47
DBMIN
48
BPFOUT
IC303
R1121N301B
1
VOUT
2
GND
3
VDD
4
CE
5
NC
IC300
BR24C02FV-W
1
A0
2
A1
3
A2
4
VSS
5
SDA
6
SCL
7
WP
8
VCC
DS300
L2-0494TAY
1
S1
2
S2
3
S3
4
S4
5
S5
6
S6
7
S7
8
S8
9
S9
10
S10
11
S11
12
S12
13
S13
14
S14
15
C3
16
C2
17
C1
C381
470 P
C375
470 P
C357
470 P
C383
0.1
C301
24 P
C300
24 P
C303
0.01
C313
100 P
C389
0.1
C335
220 P
C344
0.047
C339
220 P
C349
0.001
C362
0.1
C378
0.1
C367
470 P
C377
330 P
C366
0.1
C372
0.1
C379
470 P
C380
470 P
C369
470 P
C361
470 P
C346
100 P
C336
100 P
C334
0.1
C329
47 P
C332
0.001
C384
0.01
C385
0.001
C311
0.1
C317
0.1
C324
0.1
C327
330 P
C352
0.1
+
C371
330 P
C368
330 P
C374
47 P
C360
0.001
C359
330 P
C365
0.1
C345
470 P
C333
470 P
C338
470 P
C330
0.1
C331
0.1
C323
0.033
C319
0.1
C312
0.1
C386
0.001
C304
0.1
C387
0.001
C388
0.001
C350
0.1
C363
0.001
C373
0.001
R394
5.6 k
R395
100 k
R369
1.2 k
R421
22 k
R350
22 k
R349
1 k
R418
4.7 k
R417
47 k
R301
4.7 k
R300
4.7 k
R328
100 k
R409
100 k
R362
100 k
R360
10 k
R347
470
W300
W304
R376
1.2 k
R410
100 k
R383
120
+
R382
12 k
R375
1.5 M
R368
15 k
+
R345
10 k
R420
2.2 M
R331
10 k
R330
240 k
R364
10 k
R416
100 k
R307
10 k
R308
47 k
R332
150 k
R340
3.9 k
R344
56 k
R346
22 k
R356
82 k
R359
100 k
R388
1 M
R389
1 M
R402
3.3 k
R405
100
R404
33 k
R401
100 k
R396
1 M
R393
82
R392
4.7 k
R384
100 k
R377
15 k
R374
2.7 k
+
R366
1 k
R381
10 k
R378
330 k
R363
56 k
R361
22 k
R333
5.6 k
R327
270 k
R335
22 k
R338
22 k
R305
5.6 k
R343
47
R414
10 k
R413
10 k
R412
10 k
R304
1 M
R334
15 k
R358
56 k
R357
56 k
R373
82 k
R419
100 k
R387
4.7 k
R390
100 k
R386
100
R400
4.7 k
+
R399
10
R403
100
W301
C356
0.1
C382
0.01
R329
120 k
CP302
CP303
EP301
EP302
C341
1
C326
1
C325
1
C321
1
C320
1
C314
1
C340
1
C390
1
C343
3.3
C315
22
C376
10
C364
10
+
D301
MA2S111
C348
2.2
S300 S301
S303 S302
R422
4.7 k
S304
R423
1 M
R397
8.2
S305
R424
47 k
C351
0.1
W307
R425
10 k
R426
2.2 k
MTX-I1
MTX-I0
TONESTB
TEST
TEMP
VIN VIN
BPON
BPON
HV
HV
MMUT
MMUT
RMUT
RMUT
CHGC
CHGC
PTT
PTT
DETOUT
POWERC
POWERC
MTX-01_CSHIFT
LAMPC
TXV
TXV
MICIN MICIN
EEPCK
EEPDA
RESET
CK
DATA
PLSTB
DASTB
MTX-00_PSC
MOD
AF
SENS
SENS
SQLIN
SQLIN RXV
RXV
VCC
VCC
VCC
TRESET
PTTSW
BP
BP
AFON
+3V
+3V
CPU3V
CPU3V
+
+ + +
R391
10 k
+3V
UNLK
J300
AXK6S20545
CK
MTX-00_PSC
DATA
VCC
PLSTB
GND
DASTB
GND
DACK
MOD
GND
AF
SHIFT
R+3
T+3
SQLIN
T+3
SENS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SHIFT
DACK
BEEP
MODE
PWRSW
DOWN
UP
MICSW
CPU3V
CPU3V
+3V
[MODE] [ POWER]
[ DOWN] [ UP] [ PTT]
R+3
+3V
+3V
+3V