Voltage Diagram; Main Unit - Icom IC-4088E Service Manual

SECTION 11

VOLTAGE DIAGRAM

11-1 MAIN UNIT

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