Icom IC-M422 Service Manual page 31

MAIN UNIT
Explanatory notes
R83
2.2
VOLTAGE LINE
D7
R82
TX LINE MA77 39
RX LINE
COMMON LINE
C83
47p
R84
390
C58
R81
1k
C82
0.001
D8
MA77
FI3
ALFY450E
I O
R5V
R206
390
3.52V
C210
0.001
R205
R201
1.2k
1.5k
1.14V
XB
C209 C208 X2
C205
0.01 10 CDB450C24
100p
R208 C207
3.3k 0.001
IC2
TA31136FNG
C204
R209
1 0.01
16
1.5k
OSCIN MIXIN
2 15
OSCOUT GND
3 14
MIXOUT N-REC
4 13
VCC N-DET
5 12
C216 IFIN RSSI
6 11
DEC IFOUT
0.1 7 10
C214
C215 FILOUT QUAD
C213 8 9
1 0.1 R211 FILIN AFOUT
0.001
470k
R219
470
DEMOD
C218
C212 C211 C219
0.1
270p 270p 0.001
C220
0.001
R218
15k
R213
R212
33k 820
CP3
R215
R217
R214
10k
180k
22k
C217
R216 C221
22p
0.22
2.2k
C223
0.1
S5V
AF5V
VBIAS
C271
R271
0.1
18k
DSC5V
C273
Q38
0.01
KTC4075 BL
R274 R275 2.17V
R273
10k 10k 10k
C281
0.1
C274
R277
0.022 10k
CP7
WXDEC DSDEC
2.8V
R276
R272 C275
C272 C282
1k R282
33k C276
0.0068 0.0022 0.22
470k
0.0068
DSDEC
MICAF MICAF
MICAF
INCOM INCOM
INCOM
WXDEC
WXDEC
DSDEC
DSDEC
PAOUT
PAOUT
R5V
R5V
R8V
R8V
T5V
T5V
HV
HV
A
T5V
R93 R94
R85 22 22
C81 R91
10
0.001 2.2k
C80
0.001
L16
C93
R86 0.001 68nH
L15
C86 10k
82H
0.001
C101
C102
C91 C94 22p
18p
3p
18p
L14
47nH
Q12
2SC3775-3-E
R92
C84 C85 R87
100
18p 18p 10k
C87 R88
C88
47p R95
0.001 100
1k R96
C95 C96 C97
39
0.001 47p 470p
Q10
2SC4226 R25
L11 L12
C75
82nH
0.1H
0.001
R74
2.2k
R5V
C77
5P
C203 C202
R202 0.001 0.022 C188 C187 C185
0.001 0.1 5p
470 R203 L12
100k 0.82H
R204 R5V
C195
1.5k
Q23 0.001
FI2 FI1
KTC3880S Y
R185 C189
FL-363 FL-368
1.5K 0.001
C193
6P
S5V
R223 R224
2.7k 10k
CP5
R225
5
1 68k
4
3
IC11
2
NJM2125F
C222
R222
0.22 6.8k
R5V
C235
C231 R234
R283
0.22 10 470k
47 R5V
C234
0.022
C284 C285 R231
0.1 10
22k
R232
IC15 C286
15k
0.033
NJM2211M
C233 0.87V
1 14
V+ CAP
0.022
2 13
IN CAP
3 12 C232
R235
LOCK R
0.1
4 11 220k
GND LOOP
5 10 R285 R286
Q REF
15k
6 9 39k
Q NC
7 8
DATA FSK
R284
100k
C289 R287
C288
C287
0.1 0.01 1.8k
0.0022
R242
100k
R5V
PAOUT
R8V
T5V
HV
11 - 2
T5V
HV
IC3
RA35H1516M-121
C116
C114 C115 C117
0.1 0.1 10p 220p
L17 L18
47H 47H
C103 C104
CP11 CP12 CP13 CP14
39p 18p
R111
1M
TX H: 3.12V
L: 2.56V
C111 C112 C113 C119 C120
47p 470p 0.001
0.001 0.001
C105
R101
0.001
100
R108 C106
C108 C109
0.1
JPW
10
0.001
R102
22k
5 1
4
IC12
R103
R106
3
1.5k R107
NJM2107F
2.2k R116
2 3.3k
390
D10
MA2S111
C133 C134
C92 C107 R104
0.001
0.001 0.01 22k
0.001
R8V
C184
R182
0.01 10
R177
C182 R176
C186 R183 22K 0.001 1.5M
56P 1K
L39
C176
LS-440-LF
0.75p
C183
C178
Q22 5p 6p
3SK131 L
C177 C174
R178 R181
3p 4p
10K 47K
R172
100k
D28
KDV214E
R173
10k
C179
0.1
AF5V
VBIAS
3.72V
R233
1k
R5V
1.50V Q32
R237 C247
KTC4075 BL 0.01
2.7k
R248
R238 R239
R245 R247 1M
33k
33k
100k
1M
C238
2.2 FILO
C236 C246
2.2
0.0022 FILOS
Q31
0.91V
KTC4075 BL
R236 C237 R240
330 2.2k
560p
FILO
R250
1M
FILRMS
IC4
BU4066BCFV
1 14 AF5V R243
R241
I/O1 VDD
100k
2 13 AF5V 100k
O/I1 CONT1 C249
3 12
O/I2 CONT4 0.22
4 11
I/O2 I/O4
5 10 FILRMP
CONT2 O/I4
6 9 FILRMM
CONT3 O/I3
7 8
VSS I/O3
C241
2.2
R246 R244 C243 R252
100k 2.2
100k 100k
L20
R125 D14 C126
L21
LW-25 L308CCB
82 0.001 LA-243
C118
22
C125
C128
0.001
6p
L19
LA-253
C127
R113
18p
6.8k
R123
R121
2k 2k
R112 C121 C124
10k 15p 15p
R122 R124
2k 2k
L31
LA-243
C142
C122 C123
0.001 0.001 27p
R105
100
D13
HSM88ASR
D11 R127
R114 R115
D12
MA2S111
220 220k
1k HSM88ASR
C138 C139 C140 R128
Q17
0.001 0.001 0.001 120k
KRC404
TX H: 5.07V TX H: 2.07V
C136
L: 0.00V L: 0.66V
0.001
R8V
R147
100
C157
0.001
L36
R154
LS-440-LF
560
R151
R153 47k
C175 L38 C164
1
LS-440-LF
0.5p 3p
C173 Q21
6p C162
3SK131 L
6p
RX: 0.41V
R149
100k
R155
R171
100k 100k
C161
C160
C159 R152
3.5p 0.1
0.001 33
D27 D26
R146
KDV214E KDV214E
100k
C165 C155
C163
D25
0.001 0.001 0.001
KDV214E
Q36
2SK1069-4-TL-E
R263
R254 R256
1M
1M 1M
C248
R249
1
1k
AF5V
VBIAS C251
0.01
R257
R251 IC5 2.7k
1M
BU4066BCFV
C250
1
VOLO 1 14 AF5V
I/O1 VDD
INCOM 2 13 MMUTEM
O/I1 CONT1
INCOM 3 12 PTTM
O/I2 CONT4
FILOS 4 11 MMIC
I/O2 I/O4
MMUTES 5 10 MICAF
CONT2 O/I4
MMUTEP 6 9 PAOUT
CONT3 O/I3
7 8 INCOM
VSS I/O3
R404
R258 JPW
100k
R259 R262
R269
100k 100k 100k
R253
100k
PAOUT
R8V
T5V
HV
T5V T5V
HV HV
L22
LA-243 CP15
C132
to ANT
5p
R126
82k
CP20
C129 C130
22p 5p
C181
0.001
C181
D21
0.001
L308CCB
R180
27
L23
4.7H
D22
R179 C180
1SV307 F
2.2k 0.001
C148
0.001
R8V
C156
RX: 7.11V
R150 0.1
39k
RX: 3.89V
C158
0.01
L35
C153 C152
LS-440-LF
5p 10p
C149
C151
0.5p
10p
C154
6p
VBIAS
R266 R267 R268
1M 1M 1M
SAFO
C263
R265
C264
2.2
4.7k 0.22
R264
1.2k
AF5V
C262
0.001
IC6
BU4066BCFV
1 14 AF5V
I/O1 VDD
2 13 AF5V
O/I1 CONT1
SMICIN 3 12
PTTC
O/I2 CONT4
MICAF 4 11 SAFO
I/O2 I/O4
PTTS 5 10 AFMIC
CONT2 O/I4
/PTTC 6 9 AFMIC
CONT3 O/I3
7 8 SMIC
VSS I/O3
C265
2.2
/PTTC PTTC
Q37
DTA144EU
R8V
T5V
HV