![background image](http://html2.mh-extra.com/html/icom/ic-m2a/ic-m2a_service-manual_4298809033.webp)
5V
TEMPV
TEMPV
FCON
FCON
UNLK
UNLK
PLST
PLST
FCON
PCON
DAST
SQLI
SQLO
BEEP
BEPST
SCK
SDATA
MCON
BEPO
BEEP
VCC1
IN1
ENB
CLK
DATA
T1
LOK
CP1
FI1
FO1
GND1
IN2
VCC2
XB
XI
XO
GND2
CP2
FI2
FO2
OSCIN
OSCOUT
MIXOUT
VCC
IFIN
DEC
FILOUT
FILIN
MIXIN
GND
N-REC
N-DET
RSSI
IFOUT
QUAD
AFOUT
SCK
SDATA
3
4
1
1
2
3
4
5
6
7
8
VIN1
VOUT1
VPUT2
VIN2
VDD
LD
CLK
DI
VIN3
VOUT3
VOUT4
VIN4
VIN8
VOUT8
VOUT7
VIN7
GND
RESET
VDAREF
DO
VIN6
VOUT6
VOUT5
VIN5
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
16
15
14
13
12
11
10
9
1
2
3 4 5
2
5
6
8
9
10
7
18
17
20
19
16
15
13
12
11
14
R3
10 k
R4
47 k
2nd Lo
MODC
FI170
CFWM450E
C181
0.1
C179
120 P
SQLO
DAST
SCK
SDATA
DAST
SCK
SDATA
IC190
M62363FP-650C
5V
C180
120 P
R192
390
DET
DET
DET
R172
470
R176
6.8 k
R173
1.5 k
IC170
TA31136FN
C170
0.001
R174
220 k
C178
0.22
R175
47 k
R193
470
C194
0.01
C191
0.01
C192
10
R194
100 k
C193
0.01
C177
0.1
C176
0.001
C175
0.001
C3
220 P
R7
47 k
R22
560
L22
80 nH
C44
0.001
C32
1.5 P
C37
0.3 P
V5V
V5V
T5V
T5V
C65
470 P
Q53
2SK2973
L56
12 nH
Q54
2SK2974
L57
36 nH
C72
0.001
D52
1SV307
C80
0.001
L80
28 nH
L81
28 nH
C82
5 P
C84
7 P
R80
82 k
C87
2 P
R81
22 k
D80
1SS375
L82
36 nH
D50
MA77
R96
220 [M2A]
100 [M21]
R65
100 k
PCON
C51
22 P
C54
15 P
Q51
2SC4081 R
T5V
C58
0.1
R67
100 k
IC50
NJM2125F
R68
100
R69
15 k
1
5
2
4
3
Q52
XP6401
VCC
VCC
L51
82 nH
Q50
2SC4226 R25
R5V
R5V
Q21
2SC4226 R25
Q22
2SC4226 R25
Q23
2SC4215 O
C39
12 P
Q25
2SC4215 O
C43
22 P
C42
5 P
1st Lo
C121
0.001
L120
82 nH
L121
56 nH
C142
12 P
C140
12 P
L133
80 nH
C138
13 P
C137
2 P
D130
MA77
R131
1 k
BPFS
BPFS
V5V
R5V
Q220
2SA1588 GR
Q221
2SA1588 GR
Q222
2SA1588 GR
R222
10 k
R220
10 k
R224
10 k
R223
4.7 k
R221
4.7 k
R225
4.7 k
Q223
DTC144EUA
5V
Q225
2SB1132 Q
R227
10 k
VCC
IC220
NJM2870F05
R230
27 k
C226
0.01
CPU5V
AFV
AFV
CPU5V
1
5
4
2
3
CTRL
GND
NB
VIN
VOUT
Q224
XP6501 AB
R228
22 k
C134
1 P
C133
13 P
L130
82 nH
C131
12 P
Q90
2SC4226 R25
C104
47 P
C102
12 P
L94
80 nH
C100
12 P
D92
MA77
C99
2 P
C97
1 P
C96
12 P
L91
82 nH
C94
12 P
C92
47 P
BPFS
T5V
T5V
C108
47 P
Q24
2SC4215 O
C40
18 P
MP20
Q20
DTC144EUA
VCO CIRCUIT
MOD
PCON
MODC
PCON
MODC
PCON
R24
100 k
R25
100 k
L20
82 nH
R8
1 k
R9
10
CP1
R170
390
C159
0.01
Q151
2SC2714 Y
C156
0.001
FI151
FL-346
FI150
FL-346
R153
1.5 k
R152
1.5 k
R5V
Q150
3SK272
NOISV
MOD
5V
BEEP
VOLO
AFV
CPU5V
VOLO
AFV
CPU5V
BEEP
VOLO
AFV
CPU5V
BEPST
RSSIV
C171
82 P
R5V
R5V
5V
5V
5V
X1
CR-726
5V
IC1
UPD3140GS
C1
0.1
R1
473 k
R2
100 k
C2
0.01
D1
HVU17
C4
10 P
C7
0.01
C8
2 P
C9
2 P
C12
0.001
C5
12 P
R6
1 k
C6
0.001
R20
100
C20
0.001
C21
9 P
C10
0.047
X170
CDBCB450KCAY24
C174
0.001
R171
1.2 k
C160
0.0056
R155
1.5 k
R156
470
C155
6 P
R154
100 k
C158
0.001
C157
0.022
C153
0.001
C152
0.022
R151
3.3 k
C154
0.001
C150
0.001
R150
100
C143
0.001
R134
68
R133
10 k
C141
5 P
C139
33 P
L132
80 nH
C136
0.001
R132
10 k
C220
22
C221
0.01
C222
0.01
C223
0.01
T5VS
5VS
V5VS
R5VS
C224
22
R226
2.2 k
C225
0.22
C227
22
C228
0.001
C229
0.001
C230
10
R231
1 M
C231
1
6
1
5
2
4
3
R232
1 k
C232
0.1
R234
3.3 k
R233
2.2 k
R235
330 k
C233
0.01
R236
150 k
DS240
FY1101F-TR
R240
150
R241
820
R242
820
DS244
SML-311YTT86
DS245
SML-311YTT86
R245
1 k
BTYPE
TDETV
DS241
FY1101F-TR
DS242
SML-311YTT86
DS243
SML-311YTT86
BATTV
LEDL
LEDK
AFVS
6
5
4
1
2
3
C135
0.001
R130
10 k
L131
82 nH
C151
56 P
R10
2.2 k
C24
0.1
C25
0.001
C27
39 P
C28
0.001
C30
0.001
C11
2.2
C22
9 P
C26
47 P
R23
1 k
D20
MA2S077
D21
MA77
C31
0.001
R29
390
R30
68 k
C36
0.001
R31
680
R32
390
C50
0.001
R53
100
R52
4.7 k
C52
0.001
R55
3.3 k
R60
1 k
R61
0.15
R62
100 k
R63
10 k
C61
33
C62
0.001
C63
470 P
C67
470 P
L55
31 nH
MP50
R75
100
R71
100
C70
91 P
C71
27 P
C81
15 P
C83
22 P
C85
27 P
CP80
R82
3.9 k
C88
0.001
C68
47 P
C73
0.001
R76
150
R72
47
L53
15 nH
R59
15 k
R64
10 k
C59
0.001
C60
0.001
R70
15 k
R73
1 k
R74
10 k
C66
0.001
C64
0.001
R54
33
R58
1 k
6
5
4
1
2
3
C38
0.001
R34
470
C41
0.001
R35
68 k
C122
15 P
C132
33 P
C110
0.001
C109
470 P
C105
0.001
R94
33 k
R93
1 k
D93
MA728
C103
5 P
C101
33 P
L93
80 nH
R91
1 k
R90
10 k
L92
82 nH
C95
33 P
D91
1SV307
C93
4 P
D90
1SV307
C115
0.001
[M21] only
C91
22 P
C90
33 P
C240
0.001
R115
39 [M21] only
C98
0.001
C130
5 P
C107
0.01
C106
470 P
R95
100 [M2A]
47 [M21]
C123
10 P
R121
10 k
C120
0.01
R120
2.2 k
D51
MA77
R50
1 k
R56
1.2 k
C53
0.001
C55
24 P
R66
330 k
C56
0.01
C57
0.1
R57
82
R33
39 k
R26
8.2 k
C33
220 P
R28
180
R27
8.2 k
C34
1.5 P
D22
HVU350B
D23
HVU350B
C35
0.001
R36
1 k
C29
0.001
R5
330
+
1
2
3
VCC
Q230
2SB1132 Q
AFV
Q231
XP6501 AB
1
CP245
CP240
2
3
5
4
Q240
XP1213
5V
VOLO
VOLO
GND
GND
J240
IMSA-9230B-1-06Z124-T
from / to
the antenna connector
L90
44 nH
T5V
VCC
T5V
VCC
VCC
1
2
3
4
5
6
1
2
3
4
5
6
VCC
VOLO
VOLIN
VCC
5V
Q250
UN911H
PTT
PTT
5V
C254
0.01
IC260
TC4W66F
R258
4.7 k
R300
20 k
ATIS8
ATIS7
ATIS6
ATIS5
ATIS4
ATIS3
ATIS2
ATIS1
R302
20 k
DETM
DETM
MICM
AFOUT
R304
20 k
SPO
SPO
J251
BM02B-ASRS-TF
1
2
GND
R306
20 k
R308
20 k
D350
DA204U
Q350
DTC144TU
R353
1 k
CPU5V
R351
1 k
R310
20 k
R312
20 k
R314
20 k
MICM
DETIN
DETO
DET
R253
2.2 k
5V
IC200
NJM2902V
1
2
3
4
5
6
7
14
13
12
11
10
9
8
8
7
6
5
1
2
3
4
5V
DETM
MICO
MICIN
R255
150 k
R271
56 k
R272
120 k
C265
150 P
R273
22 k
R279
1.5 k
R276
180 k
C263
0.01
R288
220 k
R281
33 k
Q280
2SC4213 B
R286
10 k
IC280
TA7368F
AFOUT
R284
10
R350
470 k
CPU5V
IC340
HN58X2416TI
TEMPV
R346
10
CPU5V
CPU5V
CPU5V
IC360
HD6433844RA60H
CPU5V
CPU5V
CPU5V
LCDC1
LCDC2
SCK
R362 1 k
PLST
SDATA
X360
CR-610
R365 1 M
IVOLM
CLOUT
CLIN
AFVS
R5VS
R372
100 k
R373
100 k
R374
68 k
R371
100 k
BEEP
CP360
UNLK
TDEC
R360 1 k
R361 1 k
R363 1 k
R364 1 k
DAST
R366 220 k
R367 120 k
SCK
PLST
SDATA
DAST
CLIN
CLIN
RESET
BTYPE
CHEXT
WXTV
R343
10 k
IC341
S-80942ANMP-DD6
PTT
NC
VCC
NC
VIN
RIPPLE
10
9
8
7
6
POUT
PWGND
PREGND
PHASE
NF
1
2
3
4
5
R289
150 k
BEEP
BEEP
NOISV
NOISV
RSSIV
RSSIV
BEEP
NOISV
RSSIV
NOISV
RSSIV
VOLO
C267
0.22
WXTV
R263
100 k
C376
0.1
MIC
CP253
CP254
J250
HSJ1594-010050
CP255
CP252
CP251
CLONE
SPO
AFOUT
MIC
GND
CLONE
CLONE
SPO
AFOUT
MIC
GND
MC250
PTTSW
S250
R251
470
C250
0.01
R250
100 k
C251
10
R260
12 k
C260
10
R261
3.9 k
C261
0.1
R256
18 k
R202
100 k
R204
4.7 k
R205
27 k
R376
100 k
C200
0.01
C257
0.01
C262
0.01
R264
100 k
R265
100 k
C300
0.0033
R301
10 k
R303
10 k
R305
10 k
R307
10 k
R309
10 k
R311
10 k
R313
10 k
R315
20 k
R257
4.7 k
C264
0.0056
C379
56 P
R277
100 k
R274
390 k
R282
10 k
C281
0.47
C285
0.1
C282
10
C289
220
C350
0.01
CP350
CP353
CP351
CP354
CP352
C361
0.047
C363
0.047
C364
0.047
R345
470 k
C360
0.01
R341
10 k
R340
10 k
ESCK
ESDA
C342
100
C341
0.027
C365
0.047
C366
0.047
C367
0.033
C368
0.047
CP355
C288
0.047
R283
33
C286
10
C287
150 P
TDETV
BATTV
BTYPE
C283
0.1
C284
0.001
C280
0.47
R275
10 k
C205
0.018
R214
15 k
C206
0.001
C207
0.1
C378
0.0047
C377
820 P
C266
0.027
R278
1 k
R352
15 k
C351
47 P
C352
47 P
CLOUT
C340
0.01
CLIN
IVOLM
R262
1.8 k
R375
4.7 k
CP250
C252
0.001
R252
33 k
UP
S320
S323
CHWX
SQL
SCAN
DOWN
16CH
S321
S322
S324
S325
S326
DW
HL
S327
R201
15 k
R203
1.2 M
R207
27 k
C202
0.1
R206
18 k
R377
82 k
R378
82 k
R379
82 k
A0
A1
A2
VSS
8
7
6
5
VCC
WP
SCL
SDA
1
2
3
4
OUT
VDD
VSS
CD
NC
1
2
3
5
4
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
P91/SEG34
P92/SEG35
P93/SEG36
P94/SEG37/M
P95/SEG38/DO
P96/SEG39/CL2
P97/SEG40/CL1
P40/SCK32
P41/RXD32
P42/TXD32
P43/IRQ0
AVCC
PBO/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4/AN4
PB5/AN5
PB6/AN6
PB7/AN7
PC0/AN8
PC1/AN9
PC2/AN10
PC3/AN11
AVSS
P90/SEG33
P87/SEG32
P86/SEG31
P85/SEG30
P84/SEG29
P83/SEG28
P82/SEG27
P81/SEG26
P80/SEG25
P79/SEG24
P76/SEG23
P75/SEG22
P74/SEG21
P73/SEG20
P72/SEG19
P71/SEG18
P70/SEG17
P67/SEG16
P66/SEG15
P65/SEG14
P64/SEG13
P63/SEG12
P32/SEG11
P61/SEG10
P60/SEG9
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
5VS
MICM
WET
CPU5V
NOISV
BATTV
TDETV
TEMPV
RSSIV
PTT
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
DW
SCAN
CHWX
16CH
DPWN
UP
SQL
HL
ATIS8
ATIS7
ATIS6
ATIS5
ATIS4
ATIS3
ATIS2
ATIS1
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
DS360
A0153A
COM1
COM2
COM3
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
COM1
COM2
COM3
T5VS
V5VS
LEDL
ESCK
ESDA
LEDK
CP361
UNLK
BPFS
C370
18 P
C371
22 P
C372
0.1
C373
0.1
C374
0.1
C375
0.1
P57/WKP7/SEG8
P56/WKP6/SEG7
P55/WKP5/SEG6
P54/WKP4/SEG5
P53/WKP3/SEG4
P52/WKP2/SEG3
P51/WKP1/SEG2
P50/WKP0/SEG1
PA0/COM1
PA1/COM2
PA2/COM3
PA3/COM4
VCC
V0
V1
V2
V3
VSS
CVCC
P37/AEVL
P36/AEVH
P35/TXD31
P34/RXD31
P33/SCK31
P32/RESO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
P10/TMOW
P11/TMOFL
P12/TMOFH
P13/IMIG
P14/IRQ4/ADTRG
P15/IRQ1/TMIC
P16/IRQ2
P17/IRQ3/TMIF
X1
X2
VSS
OCS2
OSC1
TEST
RES
P20/SCK1
P21/SI1
P22/SD1
P23
P24
P25
P26
P27
P30/PWM
P31/UD
R212
1.5 k
R213
68 k
AFV
VOLO
AFV
MOD
BEPST
VOLIN
BEPST
BEPST
VOLIN
VOLIN
VOLIN
NOISV
MOD
BEPST
RSSIV
VOLIN
VOLIN
VOLIN
VOLIN
VOLIN
5V
VOLO
BEPO
DET
BEEP
NOISV
RSSIV
VOLO
AFV
MOD
BEPST
VOLIN
BEPO
BEPO
DET
BEEP
NOISV
RSSIV
VOLO
AFV
MOD
BEPST
VOLIN
BEPO
DET
MOD
BEPO
5V
3216
3216
C49
18 P
C48
18 P
L49
47 nH
5W_TX 3.2 V
1W_TX 1.2 V
3.6 V
RX 3.5 V
RX 1.2 V
RX 3.9 V
RX 0.7 V
RX 3.2 V
RX
0.8 V
CH16_RX 4.7 V
CH88_RX 0.0 V
5W_TX 2.4 V
1W_TX 0.5 V
Power Save OFF 5.0 V
7.5 V
Back-Light ON
3.7 V
Back-Light ON
3.8 V
5.0 V
AF Mute OFF
7.5 V
TX 4.9 V
RX 4.9 V
Power Save OFF 4.9 V
1.9 V
7.9872 MHz
3.4 Vp-p
SECTION 11
VOLTAGE DIAGRAM
11 - 1
11-1 MAIN UNIT