Icom IC-M422 Service Manual - Main Unit
11 - 1
11-1 MAIN UNIT
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
2
3
4
VCC
VCC
AF/MIC
AF/MIC
MICG
MICG
PTTC
PTTC
EXTRXD
EXTTXD
ICF3
GND
to COMMAND MIC
HM-157B/SW
Optional products
W2 OPC-1029
FI3
ALFY450E
I
O
Q36
2SK1069-4-TL-E
R92
100
Q37
DTA144EU
R205
1.2k
C106
0.1
C111
47p
C112
470p
C113
0.001
C250
1
C251
0.01
C262
0.001
C265
2.2
Q10
2SC4226 R25
R219
470
R218
15k
R217
180k
R216
2.2k
R215
10k
R214
22k
R212
820
R209
1.5k
R208
3.3k
R206
390
R213
33k
R211
470k
Q32
KTC4075 BL
Q38
KTC4075 BL
Q12
2SC3775-3-E
IC3
RA35H1516M-121
CP5
IC5
BU4066BCFV
1
I/O1
2
O/I1
3
O/I2
4
I/O2
5
CONT2
6
CONT3
7
VSS
8
I/O3
9
O/I3
10
O/I4
11
I/O4
12
CONT4
13
CONT1
14
VDD
C263
2.2
R232
15k
R277
10k
L19
LA-253
L23
4.7H
C274
0.022
C273
0.01
L38
LS-440-LF
C101
22p
IC12
NJM2107F
1
2
3
4
5
Q17
KRC404
R103
1.5k
R104
22k
R107
3.3k
R106
2.2k
R116
390
R121
2k
R122
2k
R123
2k
R124
2k
R127
220k
R179
2.2k
R180
27
R126
82k
R128
120k
FI1
FL-368
D11
MA2S111
R233
1k
R245
100k
R247
1M
R250
1M
R251
1M
R249
1k
R253
100k
R252
100k
R248
1M
R243
100k
R241
100k
R240
2.2k
C75
0.001
L17
47H
C91
18p
D10
MA2S111
R238
33k
R275
10k
C128
6p
R273
10k
R224
10k
R274
10k
C238
2.2
CP3
R111
1M
IC11
NJM2125F
1
2
3
4
5
CP15
C281
0.1
L18
47H
L36
LS-440-LF
R82
39
R83
2.2
R84
390
R81
1k
C83
47p
C82
0.001
C84
18p
C85
18p
R87
10k
R88
100
C86
0.001
C87
47p
C88
0.001
R86
10k
R85
10
R91
2.2k
R95
1k
R96
39
C95
0.001
C96
47p
C97
470p
C103
39p
C104
18p
C105
0.001
C92
0.001
C107
0.001
C133
0.001
C134
0.01
C136
0.001
C125
0.001
C122
0.001
C123
0.001
C124
15p
C138
0.001
C139
0.001
C142
27p
C148
0.001
C180
0.001
C181
0.001
C181
0.001
C140
0.001
C126
0.001
C127
18p
C129
22p
C130
5p
R101
100
C102
18p
C80
0.001
R94
22
R93
22
C93
0.001
L16
68nH
C81
0.001
R102
22k
Q31
KTC4075 BL
V
OL1
L11
82nH
Q23
KTC3880S Y
C162
6p
Q22
3SK131 L
IC4
BU4066BCFV
1
I/O1
2
O/I1
3
O/I2
4
I/O2
5
CONT2
6
CONT3
7
VSS
8
I/O3
9
O/I3
10
O/I4
11
I/O4
12
CONT4
13
CONT1
14
VDD
CP7
L14
47nH
L15
82H
CP20
C164
3p
C246
2.2
C243
2.2
C241
2.2
C249
0.22
C247
0.01
C248
1
R125
82
IC6
BU4066BCFV
1
I/O1
2
O/I1
3
O/I2
4
I/O2
5
CONT2
6
CONT3
7
VSS
8
I/O3
9
O/I3
10
O/I4
11
I/O4
12
CONT4
13
CONT1
14
VDD
L35
LS-440-LF
L20
LW-25
IC2
TA31136FNG
1
OSCIN
2
OSCOUT
3
MIXOUT
4
VCC
5
IFIN
6
DEC
7
FILOUT
8
FILIN
9
AFOUT
10
QUAD
11
IFOUT
12
RSSI
13
N-DET
14
N-REC
15
GND
16
MIXIN
FI2
FL-363
D14
L308CCB
D21
L308CCB
D22
1SV307 F
D12
HSM88ASR
D13
HSM88ASR
IC15
NJM2211M
1
V+
2
IN
3
LOCK
4
GND
5
Q
6
Q
7
DATA
8
FSK
9
NC
10
REF
11
LOOP
12
R
13
CAP
14
CAP
R114
220
C189
0.001
C187
0.1
C188
0.001
C77
5P
C193
6P
C202
0.022
C195
0.001
C203
0.001
C204
0.01
C222
0.22
C223
0.1
C221
0.22
C220
0.001
C132
5p
R271
18k
R272
33k
R276
1k
R282
470k
R284
100k
R285
39k
R286
15k
R287
1.8k
R235
220k
R242
100k
R246
100k
R244
100k
R236
330
R231
22k
R234
470k
R237
2.7k
R283
47
R185
1.5K
C94
3p
C264
0.22
R112
10k
R113
6.8k
R108
JPW
Q21
3SK131 L
C183
5p
C182
0.001
C184
0.01
C186
56P
C185
5p
X2
CDB450C24
L22
LA-243
L21
LA-243
L31
LA-243
R115
1k
R223
2.7k
R225
68k
R222
6.8k
C205
100p
C208
10
C209
0.01
C210
0.001
C207
0.001
C219
0.001
C218
0.1
C211
270p
C217
22p
C212
270p
C215
1
C214
0.1
C213
0.001
C216
0.1
L12
0.1H
L12
0.82H
D7
MA77
D8
MA77
R265
4.7k
R269
100k
R262
100k
R239
33k
R204
1.5k
R203
100k
R201
1.5k
R202
470
R173
10k
R176
1.5M
R181
47K
R178
10K
R177
22K
R182
10
R183
1K
R74
2.2k
R172
100k
D28
KDV214E
R105
100
L39
LS-440-LF
DSC5V
T5V
T5V
T5V
R8V
R8V
R8V
R8V
MMIC
/PTTC
/PTTC
PTTS
SMIC
FILOS
FILOS
PTTM
MMUTEM
MICAF
MICAF
MICAF
DEMOD
WXDEC
WXDEC
DSDEC
DSDEC
DSDEC
WXDEC
DSDEC
WXDEC
DSDEC
WXDEC
DSDEC
AFMIC
AFMIC
SMICIN
INCOM
INCOM
INCOM
INCOM
MICAF
INCOM
MICAF
INCOM
VOLO
FILRMP
MMUTEP
MMUTES
FILRMS
HV
T5V
HV
T5V
HV
R8V
T5V
HV
HV
S5V
PTTC
PTTC
PTTC
AF/MIC
MICIN
MIC1
MMUYEM
AF5V
AF5V
AF5V
AF5V
AF5V
AF5V
AF5V
AF5V
VBIAS
VBIAS
VBIAS
SAFO
SAFO
R5V
R5V
R5V
R5V
R5V
PA
OUT
PAOUT
PAOUT
PAOUT
FILO
FILO
FILRMM
1
4
3
2
to ANT
Q62
KRC404
Q61
TPC6104
1
2
3
4
5
6
R431
33k
Q54
KRC404
R415
47
IC14
LA4425A E
R433
4.7
C446
47p
C445
0.1
1
2
3
4
5
R423
10k
R421
JPW
R424
100k
R441
47k
R413
47
PTTC
AF/MIC
C412
47p
C411
0.01
R411
JPW
Q55
KTA1664 Y
R416
47
CP18
CP22
R417
47
IC10
KIA7805API
I
O
COM
Q57
KTA2015 Y
EP441
EP442
R442
100k
R386
3.9k
C444
470
IC13
M62429FP
1 VIN1
2 VOUT1
3 GND
4 DATA
5
CLK
6
VCC
7
VOUT2
8
VIN2
Q52
KRC404
Q56
KTC4075 BL
CP19
Q53
KTA2015 Y
C432
1
C433
0.001
C422
2.2
C421
2.2
C424
47p
C441
0.001
C384
0.1
C385
0.01
C386
100
C381
100
C382
0.01
C383
0.1
C425
47p
C423
0.1
C431
0.47
R432
10k
C443
470
J3
1
2
3
4
5
6
1
2
3
4
5
6
J2
1
2
3
4
5
6
Q65
2SC4213 B F
CP21
SEND
T5V
T5V
T5V
T5V
R8V
R8V
R8V
R8V
WXDEC
C337
22p
C338
0.001
C336
0.001
C334
22p
C335
0.001
C341
47p
C339
47p
C340
47p
HV
HV
HV
HV
HV
HV
EXTRXD
MIC1
MIC1
MIC2
ICF3
ICF3
ICF3
S5V
S5V
S5V
S5V
S5V
S5V
S5V
S5V
EXTTXD
EXTRXD
GND
AF/MIC
R5V
R5V
R5V
R5V
WXDEC
DSDEC
PAOUT
T5V
R8V
HV
T5V
R8V
HV
T5V
R8V
HV
R5V
PAOUT
PAOUT
T5V
R8V
HV
R5V
PAOUT
PAOUT
VCC
VCC
S5V
S5V
VCC
VCC
VCC
VCC
C353
1
R353
560k
R355
33k
R354
15k
R356
4.7
C351
0.01
C377
47p
C359
47p
C357
0.1
C358
47p
C354
0.001
C378
0.001
C355
470
C356
470
C352
2.2
C361
0.001
C360
0.001
C344
470p
C342
0.001
C343
0.001
C345
470p
IC9
LA4425A E
1
2
3
4
5
VOL2
VCC
GND
SP+
to DC POWER
MICG
PAO–
PAO–
to EXT PA SP
CP16
CP17
EP341
EP342
SP+
SP–
to EXT SP
VCC
EXTTXD
EXTRXD
ICF3
GND
EXTTXD
EXTRXD
ICF3
PTTC
PAO+
PAO+
PAO–
PAO+
SP+
SP+
SP–
SP–
VOLG
GND
VOL1
VOL1
GND
GND
GND
GND
SQLV
PWRON
PWRON
VOL2
GND
GND
DSDEC
WXDEC
WXDEC
DSDEC
DSDEC
HV
VCC
HV
DSCENC
DSCENC
DSCENC
DSCENC
BEEP
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
J4
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
to LOGIC
board J4
PCK
PDATA
EXTRXD
SQL
EVDATA
EVDATA
EVCK
EVCK
GND
BPFV
ATT
RMUTES
RMUTEM
RMUTEP
PAMUTE
PAMUTE
PTTS
PTTM
MMUTES
TMUTE
H/L
MMUTEP
EXTTXD
EXTTXD
TXDET
GND
GND
PSTB
MMUTE
UNLK
GND
SEND
GND
RCV
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
J5
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
to LOGIC
board J5
W1 cable
OPC-1405
C348
82p
C349
0.001
C332
0.001
C333
0.01
HV
X1
CR-804
C318
47p
R9
2.2k
IC8
NJM4558M
1
2
3
4
5
6
7
8
R319
27k
Q6
2SC4215 O F
Q3
2SC4215 O F
C305
0.1
C304
0.01
C293
0.001
C292
0.01
R2
1k
R5
100k
R6
330
R26
22k
R27
22k
C21
10
C22
0.01
C23
0.001
C26
0.01
C27
1
C4
0.047
C1
0.022
C5
2.2
C43
0.22
C44
0.001
C42
47p
C41
47p
C29
470p
C24
470p
R25
100
C2
0.01
C3
0.1
R303
2.2k
R301
100k
R7
1k
IC7
NJM4558M
1
2
3
4
5
6
7
8
R11
330
Q5
2SC4226 R25
R309
100k
R295
8.2k
R292
820k
R293
10k
R10
10k
L7
0.1H
CP1
IC1
µPD3140GS A
1
VCC1
2
IN1
3
ENB
4
CLK
5
DATA
6
T1
7
LOK
8
CP1
9
FI1
10
FO1
11
FO2
12
FI2
13
CP2
14
GND2
15
XO
16
XI
17
XB
18
VCC2
19
IN2
20
GND1
R3
1k
D2
MA77
C45
1.5p
C49
470p
C48
470p
C47
0.001
R44
100
R45
390
R51
680
R52
68k
R46
180
R42
8.2k
R43
8.2k
R21
1k
R22
1k
R41
560
C317
0.22
R24
1k
R316
82k
R317
82k
MP1
1
2
3
4
C306
12p
R294
10
C322
1
C302
0.01
R4
1k
R315
82k
R311
4.7k
R341
JPW
R313
100k
C303
270p
C301
0.1
C291
10
Q1
KTC4075 BL
R328
8.2k
R327
47k
R326
15k
R324
10k
R323
10k
R325
10k
R314
18k
C58
22p
C58
XB
XB
C58
L3
2.7H
C32
5p
D1
MA77
D3
HVC350B-E
D4
HVC350B-E
Q4
2SC4226 R25
R321
1.8k
Q2
KRC404
R308
560k
R312
27k
R304
56k
R302
10k
Q7
2SC4215 O F
R320
1M
L2
56nH
R307
6.8k
R306
10k
R305
100k
R1
1k
R28
100k
R8
10
C33
22p
C34
27p
C35
27p
C36
0.001
C46
1.5p
C20
0.001
C13
18p
C12
10p
C11
12p
C7
0.001
R23
47k
C51
0.75p
R34
22
C56
6p
C57
470p
C55
0.001
C31
470p
L1
0.1H
C313
0.0047
C314
56p
C312
820p
C311
0.1
L4
80nH
PSTB
UNLK
PCK
PDATA
MOD
MOD
MICAF
MICAF
R5V
R8V
T5V
HV
R5V
R8V
T5V
HV
A
A
MICAF
VCO5
INCOM
INCOM
INCOM
PAOUT
PAOUT
S5V
S5V
VCO5
S5V
S5V
S5V
S5V
S5V
AF5V
AF5V
AF5V
VBIAS
R5V
R5V
R5V
AF5V
S5V
VBIAS
AF5V
S5V
VBIAS
C331
0.01
C323
0.0068
C347
82p
C346
0.001
R403
JPW
C370
0.1
C369
2200
C373
22p
C374
22p
C375
100p
C376
470p
C367
0.001
C379
100p
C368
47p
C380
470p
D42
DSA3A1
C387
0.1
C390
0.1
R385
1k
R384
10k
C391
0.001
C392
10
R387
3.9k
C393
10
C389
10
C388
0.001
R382
10k
R383
1k
R318
100k
C315
0.01
C316
10
L6
0.1H
C52
470p
R31
470
R55
100
R56
27k
R32
68k
R33
220
R35
220
C114
0.1
C115
0.1
C116
10p
C117
220p
C118
22
C120
0.001
C119
0.001
C109
10
C108
0.001
C121
15p
CP12
CP11
CP13
CP14
C151
10p
C152
10p
C156
0.1
C158
0.01
C154
6p
R150
39k
R151
47k
R153
1
R152
33
R155
100k
R171
100k
R147
100
R149
100k
R154
560
R146
100k
D25
KDV214E
D26
KDV214E
D27
KDV214E
C149
0.5p
C153
5p
C157
0.001
C155
0.001
C163
0.001
C165
0.001
C175
0.5p
C176
0.75p
C173
6p
C174
4p
C177
3p
C179
0.1
C178
6p
C159
0.001
C160
0.1
C161
3.5p
C271
0.1
C272
0.0068
C275
0.0022
C276
0.0068
C282
0.22
C287
0.0022
C288
0.1
C289
0.01
C231
0.22
C232
0.1
C233
0.022
C235
10
C234
0.022
C236
0.0022
C237
560p
C284
0.1
C285
10
C286
0.033
R254
1M
R256
1M
R263
1M
R266
1M
R267
1M
R268
1M
R257
2.7k
R264
1.2k
R258
100k
R259
100k
R404
JPW
MAIN UNIT
MAIN UNIT
CHASSIS UNIT
RMUTEM
RMUTES
RMUTEP
MMUTES
MMUTEP
PTTM
PTTS
TMUTE
H/L
TXDET
ATT
SLQ
BPFV
RCV
RF INPUT
GA
TE BIAS
DRAIN BIAS
RF OUTPUT
VOLTAGE LINE
TX LINE
RX LINE
Explanatory notes
COMMON LINE
VOLTAGE LINE
TX LINE
RX LINE
Explanatory notes
COMMON LINE
2.28V
0.84V
2.63V
3.99V
3.38V
TX H: 2.07V
L: 0.66V
RX: 7.11V
TX H: 5.07V
L: 0.00V
2.17V
2.8V
4.96V
13.76V
RX: 4.93V
RX: 8.34V
TX: 5.08V
TX: 4.85V
13.80V
RX: 5.05V
RX: 3.89V
RX: 0.41V
2.70V
4.89V
3.72V
0.91V
0.87V
1.50V
TX H: 3.12V
L: 2.56V
1.14V
3.52V
SECTION 11 VOLTAGE DIAGRAM