Icom IC-M412 Service Manual page 27

SECTION 8 BOARD LAYOUTS
• LOGIC-A UNIT
(TOP VIEW)
DS7
• SQL-A UNIT
(TOP VIEW)
J1
R1
SQL
8 - 1
DS3
• VR-A UNIT
(TOP VIEW)
J1
R1
VR
• MAIN-A UNIT
(TOP VIEW)
C355
D42
IC9
C380
C368
C463
C464
C370 C389
C388
C371
Q57
EP403 C353 C465
R355 R354
C345
C356 C392
Q58
C473
IC10
R388
C646
C391
EP342
C472 Q53 R557
C462
FI5
C471 C360 C476
EP341 R387 R558
Q54
C361
C393
CP6
C532
FI6
X5
R533 R532
C362
R651
C348 C551
W2
C533
R652
R236
R238
C547 C546 C541
R232 C347
C237
X4
C234
R239
R234 R235
C542
C232
R542
R240 C235
C543
C548
R257
R245
EP402
R26
R307 R28
C27
R249
R252
C241 R327
C249
R323
C304
R359
R308 R317
C231
R309
R325
R311 R312
R246
CP1
C587
C588
C572
R584 R573
C589 R583
R437
R585
Q65
R586
C335
R436
R587 J6 C334
R1
C339
R2
J6
R3
C586
C337
C336
R401
EP401
ANT CONNECTOR
J1 (CHASSIS)
RF PA module
(IC3)
RFin VGG VDD RFout
C121
C115
C373
R92 L19
C91 D12
R102 R122
R112
L15 R88
Q10 C124
R89 C98
R80 C138
R91
R100 R112
C83
D14
C88
C87 Q15 R110
C123 R124 R123
C136 R114 C134
R111
L20
R113
Q16
R125
C140
C119 C137
C142
R555 R553 R551
R523
R556 R554 R552
FI4
C522
C501
C503
R501
R521 L64 Q61
L62 R506
C511
R513
C499
Q62 C513
C496 C495
R512
R514
C504
L65
C534
C535
R507
R81
R45 R44 D52 R615
R42
R56 L70
D51 Q72
C56 C58
C51
L6 C606
L71
C642
C57
C616
Q3 R643
Q74
R32 C55
C641
R31
C29 L4 CP2 MP3
L1 R609
C22 C633
Q71 R634
D2 R33
R35
R632 R631
Q1 C600
R621 C634
C24
R603 R622
C622
C30
C603
C635 C632
Q2 R23 R602
R633
C23 R624
MP1
MP3
R8
C34 L5
C35
IC16
R215
R15
C19
C624
R212
C37
C626
C212
R13
R12 R219
C211
Q86
R262 C262
X1
R263
R264
C264
C12
R267
C403
B7427A FI3
X2
J4
W1
R126
C129
L21
L22
C128
C127
C126
C143
L31
D21
C152
L35
C151
R151
R150
Q21
L36
C156
R147
C162
R155
C163
L38
C173
C179
R172 C178
L39
R176 C183
R181
L13 L12 Q22
C180
L42
R185
C186
C185
C223
C215
C193
C222
C213
CP5
R222
R223
R224
IC2
R201
C201
C204
C205 C221
R205
CP3