![background image](http://html.mh-extra.com/html/icom/ic-m220/ic-m220_service-manual_612744029.webp)
9-1
TX: 0 V
RX: 4.8 V
TX: 5.0 V
RX: 0 V
13.8 V
TX: 2.8 V (LOW POWER)
2.6 V (HIGH POWER)
RX: 0 V
TX: 2.8 V (LOW POWER)
2.6 V (HIGH POWER)
RX: 0 V
5.0 V
3.3 V
13.7 V
Voltage Line (HV)
Explanatory notes
RX Line
TX Line
Voltage Line (VCC)
Voltage Line (5V)
Voltage Line (3.3V)
CP15S
CP15
CP15S
CP16
47P
C30
10P
C28
0.001
C141
0.001
C142
0.001
C140
18P
C112
0.001
C113
18P
C114
27P
C116
27P
C121
18P
C111
470P
C146
0.001
C147
0.0022
C123
0.001
C31
0.001
C144
0.001
C143
0.001
C145
0.001
C11
KTA2015
Q10
KTC3770U
Q12
0.1U
L1
41.0N
L102
35.0N
L103
LDTC114EE
Q17
10
R24
10k
R22
15k
R23
82k
R91
100k
R76
1k
R12
10k
R11
100
R26
1k
R80
47k
R81
4.7k
R79
180
R75
1.8k
R73
1.8k
R72
1.8k
R74
1.8k
R71
220
R78
JDP2S12CR
D14
L5204F
D15
MMBD352WT1
D12
MMBD352WT1
D13
0.82U
L101
LRB520G
D11
NJU7056F3
IC2
1
2
3
4
5
0.01
C151
0.001
C150
NJU7056F3
IC702
1
2
3
4
5
TC7S66FU
IC703
1 2 3
4
5
J1
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
27
28
29
30
100P
C627
47k
R603
0.1
C622
0.01
C604
KIA7805API
IC512
I
O
COM
0.001
C626
0.1
C603
0.001
C629
XC6221A332MR
IC511
1 VIN
2 VSS
3 CE
4
NC
5
VOUT
1N5402
D601
0.01
C602
0.01
C615
0.01
C625
0.1
C605
LDTC144EE
Q511
0.001
C620
0.1
C614
470
C621
0.01
C628
47k
R602
0.01
C513
TC74VHC4066AFK
IC504
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
0.001
C813
0.001
C815
0.001
C816
0.001
C818
10
R212
470
R213
0.01
C351
0.01
C612
0.1
C613
0.001
C802
0.001
C801
NTCG16
R341
0.001
C806
470
C751
1.0U
L216
35.0N
L105
47N
L211
22P
C212
22P
C213
22P
C823
0.001
C827
0.001
C829
0.001
C817
0.001
C828
22k
R732
0.001
C214
47
R111
0.001
C211
47N
L311
47
R112
22P
C312
0.001
C311
0.001
C314
0.01
C741
MMZ1005S601CT
EP701
1k
R324
0.001
C68
0.1
C69
0.001
C341
1k
R224
AT1846S
IC301
1
AVDD
2
SCLK
3
SDIO
4
AVDD
5
XTAL1
6
XTAL2
7
MODE
8
SENB
9
AFOUT 10
NC 11
MIC_IN 12
CC 13
AVDD 14
NC 15
RFIN 16
AVDD
17
NC
18
RFOUT
19
NC
20
NC
21
AVDD
22
PABIAS
23
AVDD
24
PDN
25 GPIO7
26 GPIO6
27 GPIO5
28 GPIO4
29 GPIO3
30 GPIO2
31 GPIO1
32 GPIO0
33 GND
AT1846S
IC201
1
AVDD
2
SCLK
3
SDIO
4
AVDD
5
XTAL1
6
XTAL2
7
MODE
8
SENB
9
AFOUT 10
NC 11
MIC_IN 12
CC 13
AVDD 14
NC 15
RFIN 16
AVDD
17
NC
18
RFOUT
19
NC
20
NC
21
AVDD
22
PABIAS
23
AVDD
24
PDN
25 GPIO7
26 GPIO6
27 GPIO5
28 GPIO4
29 GPIO3
30 GPIO2
31 GPIO1
32 GPIO0
33 GND
15k
R613
47
C637
1M
R524
15k
R611
0.001
C809
0.001
C807
0.001
C804
0.001
C812
22P
C826
22P
C822
22P
C820
22P
C821
0.001
C825
1M
R513
1M
R512
1M
R523
LDTC114EE
Q16
MMBD352WT1
D16
LDTC144EE
Q202
0.1
C228
0.001
C221
0.001
C226
0.001
C229
0.001
C231
0.001
C344
0.001
C321
0.001
C326
0.001
C331
0.1
C227
0.1
C327
0.1
C322
0.1
C345
1
R801
0.001
C808
1
R753
0.1
C763
470
C761
470P
C762
220
R751
2.2
R752
0.1
C767
47P
C766
0.039
C754
0.001
C753
0.1
C752
33P
C749
0.001
C750
22k
R746
0.1
C745
220k
R740
10k
R738
22k
R736
22k
R735
33k
R733
220P
C743
100
R242
10k
R241
0
R240
0
R239
0.1
C254
10
R231
0.01
C251
0.1
C222
24.5N
L2
AFT05MS003N
Q13
100P
C51
0.001
C52
0
R25
31.0N
L4
100
R323
100
R223
2775
MP1
1 2 3 4
2775
MP2
1 2 3 4
1k
R528
NJU7056F3
IC505
1
2
3
4
5
100k
R515
22P
C824
470k
R744
0
R601
0.001
C41
10k
R47
U2429G
IC506
1 VIN1
2 VOUT1
3 GND
4 DATA
5
CLOCK
6
VCC
7
VOUT2
8
VIN2
22k
R502
22k
R503
10k
R504
AFT05MS031NR1
Q14
0.01
C352
0.001
C25
0.001
C12
UTRS485G
IC551
1
RO 2
RE 3
DE 4
DI
5 GND
6 A
7 B
8 VCC
0.01
C564
L1SS400
D551
0.001
C631
CP10S
CP14
CP10S
CP11
CP10S
CP13
CP10S
CP12
CP10S
CP10
CP10S
CP9
LDTC144EE
Q11
100
R334
1M
R333
1.8U
L312
1.8U
L313
4.7k
R343
4.7k
R344
1.0U
L217
2.7k
R511
CP08S
CP41
CP08S
CP42
100
R221
100
R220
CP06S
CP51
CP06S
CP52
CP06S
CP53
CP06S
CP55
CP06S
CP56
CP06S
CP57
0.001
C335
0.1
C336
0.1
C339
0.001
C338
10P
C334
10P
C337
10P
C343
10P
C320
10P
C323
10P
C223
10P
C220
0.1
C245
0.001
C244
10P
C243
470P
C241
220P
C333
22P
C332
22P
C232
220P
C233
4.7
C13
UT6401G
Q512
1
2
3
4
5
6
TC7SU04FU
IC302
1
2
3
4
5
MT3S20P
Q101
100P
C129
0.0022
C130
12P
C131
2P
C132
0.0022
C133
0.01
C134
10
R101
LQW18AN56NG00
L107
LQW18AN68NG00D
L111
LQW18AN68NG00D
L112
15P
C137
15P
C138
27P
C136
56
R104
15P
C63
82P
C71
MPZ1608S221A
EP2
MPZ2012S300A
EP3
31.0N
L5
39
R750
330
C755
10
C606
2.2
C53
100
R322
0
R44
J2
1
2
3
4
5
6
7
8
0.0022
C135
0.1
C555
0.001
C566
0.1
C565
0.068
C562
0.001
C563
0.001
C561
10
R551
10
R552
470
R561
1.8k
R562
1
R554
47k
R553
4.7k
R563
PC357N6J000F
IC552
LDTA123YET
Q201
10
C57
2.2
C56
0.001
C55
100P
C54
33P
C61
15P
C75
5.8N
L6
23.5N
L7
52.0N
L3
100
R31
100k
R555
100
R45
2.2k
R102
820
R103
4P
C127
4P
C128
39
R105
22P
C122
LQW18AN82NG00D
L106
100
C611
100
C616
CP10S
CP21
CP10S
CP22
120
R107
120
R108
47
R106
6P
C24
33P
C42
100P
C72
82P
C74
100P
C76
TDA2003L
IC701
1
2
3
4
5
6P
C115
1.5P
C125
9P
C126
0
R109
0
R110
LQW18AN82NG00D
L108
33k
R527
4.7
C97
0.001
C98
0.1
C96
470P
C94
0.001
C95
47P
C93
0.1
C47
0.001
C46
220P
C91
0.001
C92
10k
R35
LDTC144EE
Q18
LDTC144EE
Q19
100P
C67
3.3k
R82
0.001
C48
560
R326
560
R331
47k
R34
0
R21
CR-1073
X2
1 GND
2 GND
3
OUT
4
VCC
0.47U
L109
0.001
C120
3.9k
R99
100
R100
22k
R342
100P
C624
0.001
C623
22P
C313
22P
C27
5P
C124
1.5P
C139
39k
R737
680k
R731
4048
MP6
1 2 3 4
10k
R33
R32
47k
100k
R46
10k
R86
0.1
C149
4.7k
R233
4.7k
R232
3P
C21
33k
R501
680P
C502
180k
R85
R83
15k
0.01
C153
100k
R84
0.001
C148
0.1
C154
47P
C771
47P
C773
4048
MP5
33P
C62
0.1
C255
0.1
C510
0.1
C509
0.1
C508
0.1
C519
0.1
C515
0.1
C514
0.1
C256
0.1
C501
0.1
C500
0.1
C517
0.1
C516
0.1
C518
0.1
C742
0.1
C732
0.1
C747
0.1
C737
0.1
C748
0.1
C738
1
C746
0
R745
1
C252
0.1
C764
0.1
C511
0.1
C512
0.1
C239
0.001
C238
10P
C237
0.1
C236
0.001
C235
10P
C234
100
R214
10
C253
4.7
C250
4.7
C246
4.7
C249
2P
C242
TDETV
HL/ATT
T5VSO
PONO
PONO
T5VSO
DSCENC
SCK
SCK
BEEPO
VDATA
SDIO
SDIO
VCC
VCC
TEMPV
DSCDEC
TXMSO
PONO
VCK
PDN
SCK
SDIO
TDETV
TXMSO
RINTM
RINTM
BEEPO
PDN
BUSYM
BUSY70
IMICS
DSCS
DSCENC
NM1RXI
NM1RXI
NM1TXD
DSCS
IMICS
HL/ATT
BUSYM
BUSY70
NMEAI+
NMEAI-
NMEAO+
NMEAO-
HV
HV
NM1TXD
5V
3.3V
MICIN
TEMPV
VDATA
VCK
T5V
HL/ATT
HL/ATT
5V
MICIN
SCK
SDIO
to ANT
SP- SP+
SP+
SP-
AFINM
MICG
WXDEC
to DC POWER
GPIO7
PCON
SQL
TXON
RXON
GPIO0
GPIO1
INT
SDO
GPIO0
GPIO1
INT
SDO
RXON
SQL
GPIO5
SP+
SP-
MICG
GPIO7
SECTION 9
VOLTAGE DIAGRAM
* Refer to the PARTS LIST for the value and name of component.
• MAIN UNIT