Icom IC-M422 Service Manual page 30

SECTION 11 VOLTAGE DIAGRAM
11-1 MAIN UNIT
J3
VCC VCC
1 5
1
AF/MIC AF/MIC
2
2
MICG MICG
3
3
PTTC PTTC
to COMMAND MIC 4
6 4
HM-157B/SW
R413
Optional products
47
W2 OPC-1029
J2
7 1 1 VCC EXTTXD EXTTXD
1 5 5 1
7 EXTRXD EXTRXD EXTRXD
2 2
2 AF/MIC ICF3 ICF3
3 3
6 8 2
8 ICF3
GND GND
4 4
6 6
6 EXTTXD
3 MICG
5
3
4 GND
4
5 PTTC
CHASSIS UNIT
J4
SP+
2 1
SP+
SQLV
4 3
SP–
SP–
6 5
BEEP
PWRON
7
8
HV
10 9
HV
12 11
VCC
13
14 VOL1
VOL1
to LOGIC GND
16 15
board J4 VOL2
GND
18 17
VOLG
DSCENC
20 19
GND
WXDEC
22 21
GND
DSDEC
24 23
GND
ICF3
ICF3
26 25
S5V
GND
28 27 MIC1
MIC1
GND
29
30
MIC2
R403
C337
JPW 22p
W1 cable
OPC-1405
SP+ EP341
CP16
C342
C361 C360 C344 C345
0.001
0.001 0.001 470p 470p
to EXT SP
EP342
SP– CP17
C343
0.001
CP18 HV
to DC POWER
CP19
PAO+ CP21
to EXT PA SP
CP22
PAO–
J5
EVCK
2 1
EVDATA
GND
4 3
GND
SEND
6 5
RCV
PWRON
MMUTE
8 7
RMUTEM
MMUTES
10 9
RMUTES
MMUTEP
HV HV
11
12
RMUTEP
TMUTE C348 C349 C332 C333
14 13
82p 0.001 0.001 0.01
PAMUTE
S5V
H/L
to LOGIC
16 15
board J5 ATT
PTTM
18 17
BPFV
PTTS
20 19
GND C336 C334 C335
TXDET 0.001 22p 0.001
22 21
SQL
GND
24 23
GND
EXTTXD EXTTXD
26 25
EXTRXD
UNLK
EXTRXD
28 27
PDATA
PSTB
30 29
PCK
C340
47p
C339 C341 C338
47p 47p 0.001
C369
2200
AF/MIC
PTTC
R411
JPW
C411
C412
0.01
47p
R415
47
EXTTXD
R416
47
EXTRXD
R417
47
ICF3
VCC
VOL2
C352 SP+
2.2
C377 C378 C355
47p 0.001 470
C356 R356
IC9 C359
470 4.7
R354
47p
LA4425A E
15k
5
1
4
C351 R353 C353 2 C357
0.1
0.01 560k 1
3
R355
C354
33k
0.001 GND
C358
47p
Explanatory notes
VOLTAGE LINE
MAIN UNIT
TX LINE
RX LINE
COMMON LINE
DSCENC
WXDEC
DSDEC
PAOUT
R423
10k
IC14
C421
2.2 R424 LA4425A E
C422 100k
2.2
R421
Q65
JPW
2SC4213 B F
1 VIN1 8
VIN2
2 VOUT1 7
VOUT2 S5V
3 GND 6
C432
VCC
4 DATA 5
CLK R431 1
C424
33k
IC13
47p
C425 C423 C431 R432
M62429FP 47p 0.1 0.47 10k C433
0.001
EVDATA
EVCK
S5V
PAMUTE
Q61
TPC6104
13.76V
3 2 1
Q62
KRC404
R442 R441
100k 47k
4 5 6
C441
0.001
HV
VCC
S5V
IC10
4.96V
KIA7805API
RX: 8.34V
VCC S5V
I O
COM
Q55
C381 C382 C383 C384 C385 C386 KTA1664 Y
100 0.1 0.01 100
0.01 0.1
RX: 4.93V
C373 C374 C375 C376
22p 22p 100p 470p Q53
KTA2015 Y
S5V
R5V
13.80V
C367 C379 C368 C380
0.001 100p 47p 470p R384
C390
C387 10k
0.1
0.1
R387
C392
C391 3.9k
Q54
10
R385 0.001
1k KRC404
C370
D42 Q56
0.1
DSA3A1
KTC4075 BL
RX: 5.05V
S5V
Q1
VCO5
KTC4075 BL
R22
R21
1k
1k
R41
560
C21 R23
10 47k
C22 C23
0.01 0.001
R26 R28
22k 100k
R9
2.2k
R27 C26
0.01
22k
C27
R8
R7
1 10
1k
MOD
C4
0.047
S5V
R1
1k
PSTB
R2
1k
PCK
R3
1k
PDATA
R5
100k
R4
1k
UNLK
R6
C1 330
0.022
S5V
DSCENC
WXDEC
DSDEC
PAOUT
VCC VCC
C443
470
C444
5
1
470
EP441
4 PAO+
2
R433
3
4.7
C445
0.1 EP442
PAO–
C446
47p
PAO+
PAO–
R5V
R8V
T5V
HV
VCC VCC
S5V S5V
R8V
C388
0.001
TX: 4.85V
Q57
DSDEC
KTA2015 Y
T5V PAOUT
R386
R382
3.9k
R5V
10k
C389
10 R8V
C393
R383
Q52
10
1k
KRC404 T5V
HV
TX: 5.08V
S5V
VCO5
R44 R51
L3 L4
D3 D4
100 680
2.7H 80nH
HVC350B-E HVC350B-E
2.28V
C43 C44 R45 C49
C45
0.22 0.001 C42 390 470p
1.5p
47p R52
R24
68k
1k
D2
C41 C29 R42
C51
Q2 MA77
47p 470p 8.2k
Q4 0.75p
KRC404
2SC4226 R25
D1
C47
R46 C48
MA77
0.001 180 470p
R43
R10
8.2k
10k CP1 0.84V
C46
C5
1.5p
2.2
C24 R25 Q5
470p 100
2SC4226 R25
R5V
S5V
C2 C3 C20
IC1
0.01 0.1 0.001
µPD3140GS A
1 20
VCC1 GND1
2 19
IN1 IN2
3 18
ENB VCC2
4 17
CLK XB
5 16
DATA XI
6 15
T1 XO
7 14 X1
LOK GND2 R11
CR-804
8 13
330
CP1 CP2
9 12
FI1 FI2
10 11
FO1 FO2
C7 C11 C12 C13
0.001 12p 10p 18p
S5V
4.89V
C346 C347 C331
0.01
0.001 82p
R323
10k
R328
MOD 8.2k
R324
R326
R327
10k
15k
47k
C293
0.001
C323 R325
0.0068 10k
AF5V
R313
R318
100k
100k
C315 C316
C306
0.01 10
12p
R312
R315
C313 R316 27k
82k 82k
0.0047
IC8 R308
560k
NJM4558M
R317
C312
1 8 82k 820p
2 7
3 6
4 5
C314 R311
56p 4.7k
R320
R314
1M
18k
C318 R319 C317
0.22
47p 27k
DSCENC
C322
R321 MICAF
1.8k 1
INCOM
WXDEC
11 - 1
S5V
R55 C55
100 0.001
R31
3.99V
470
R56 L7
C52 C57
470p 27k 0.1H
470p
L6
C58
0.1H
C58
22p
C56 Q7
2.63V
6p
2SC4215 O F
L1
C31 3.38V
0.1H
470p
Q6 R32
C33
68k
22p
2SC4215 O F
C32
5p
MP1
Q3
2SC4215 O F
C36
R34 L2
0.001 22 56nH
R5V
R35 R33 C35 C34
220 220 27p 27p
XB
S5V
R295
8.2k
2.70V
R294
10
R292 R293
C292
10k
820k
0.01
S5V
AF5V
VBIAS
VBIAS
R309
C304 R305
C291
100k 0.01
100k 10
R301
100k
R307
C305
6.8k 0.1
C303 R303 C302
R306
270p 0.01
2.2k
10k
IC7
R304
NJM4558M
56k
AF5V
1 8
2 7
3 6
4 5
R302
C311
10k
0.1
C301
R341
0.1
JPW
MICAF MICAF
INCOM
INCOM
WXDEC
WXDEC
DSDEC
DSDEC
PAOUT
PAOUT
R5V
R5V
R8V
R8V
T5V
T5V
HV
HV
A