![background image](http://html.mh-extra.com/html/icom/ic-m220/ic-m220_service-manual_612744022.webp)
7-1
The actual configuration of the PC board can be seen by viewing the top and bottom BOARD LAYOUT pages together.
See the PARTS LIST H/V location on the PARTS LIST for location details.
SECTION 7
BOARD LAYOUTS
• MAIN UNIT (B-8866C: TOP VIEW)
W1
MP1
MP2
MP6
D601
IC512
IC701
3
B8866C
6
4
5
2
1
C345
C344
C343
C336
C335
C334
C331
C327
C326
C322
C321
C320
C244
C243
C236
C235
C234
C231
C229
C227
C226
C222
C221
R801
R751
R750
R613
R611
R603
R602
R601
R563
R562
R555
R554
R553
R528
R527
R524
R523
R515
R513
R512
R504
R503
R502
R501
R334
R333
R331
R326
R324
R322
R242
R241
R240
R239
R233
R232
R231
R224
R91
R76
R74
R73
R7
2
R71
R47
R46
R45
R34
R33
R32
R31
R26
R25
R24
R23
R22
R21
R12
R11
L1
C829
C828
C827
C826
C825
C824
C823
C822
C821
C820
C818
C817
C816
C815
C813
C812
C809
C808
C807
C806
C804
C802
C801
C767
C766
C762
C753
C631
C629
C628
C620
C615
C613
C612
C605
C604
C603
C602
C566
C565
C564
C562
C555
C519
C518
C517
C516
C515
C514
C513
C512
C511
C510
C509
C508
C502
C501
C500
C352
C351
C341
C333
C332
C314
C313
C312
C256
C255
C254
C251
C241
C233
C232
C228
C214
C213
C212
C145
C144
C143
C142
C141
C140
C123
C122
C98
C95
C94
C93
C69
C68
C67
C55
C54
C52
C51
C47
C46
C42
C41
C31
C30
C28
C27
C25
C24
C21
C12
C11
X2
R752
R342
R341
R323
R223
R44
Q512
Q511
Q18
Q14
Q13
Q12
Q11
Q10
MP2
MP1
L313
L312
L311
L217
L216
L211
L109
L105
L103
L102
L101
L7
L6
L5
L4
L3
L2
J1
IC552
IC551
IC511
IC506
IC505
IC504
IC302
IC301
IC201
EP3
EP2
D551
D15
D14
D13
D12
C761
C755
C754
C752
C751
C637
C621
C616
C614
C611
C606
C253
C252
C250
C246
C121
C116
C115
C114
C113
C112
C111
C97
C96
C76
C75
C74
C72
C71
C63
C62
C61
C57
C56
C53
C13
H0
H5
H10
H15
H20
H25
H30
H35
H40
H45
H50
H55
H60
H65
H70
H75
H80
H85
H90
H95
H100
H105
H110
V0
V5
V10
V15
V20
V25
V30
V35
V40
V45
V50
V55
R221
R220
J1
T5VSO
TXMSO
PONO
TDETV
BUSYM
BUSY70
NM1RXI
NM1TXD
MICIN
SP+
AFINM
WXDEC
NC
NC
GND
DSCENC
VDATA
DSCDEC
VCK
PDN
SCK
SDIO
RINTM
GND
BEEPO
HV
TEMPV
L5V
SP
−
MICG
J1