Icom IC-F4001 Service Manual page 27

• MAIN-A UNIT
(BOTTOM VIEW)
R472
R473 R474
R471
IC53
R456
-RES
C451
D52
R432
R461
R460
R434
R462
C356
-REF
C429
IC52
Q73
MOD-
C378
+5V
S5V-
R390
-VREF
DISC-
SDEC-
MMUT-
-EPTT
-ATX
C385
R430
D53
MC51
-CL
R146
C236
C235
R147
D33 D31
PWON
R155
D34
C261
C423
Q27
C264
R158
R139 C243 C240 R138
C266 R152 NWC
R431
C242 R140
Q19 R141
R143 C241
R142
-SQIN
C93 R71
+5V
LVA
R72 C123
R51
C118
Q12
-R5V
R52
L47
Q9
C147
R132 C224
C72
D6
R35 C206
Q15
D5
C63 R32 R30
-TEMP
IC60
C65 R34 C59
R33
C64
C61 C62
L9 C53
C340 R359
R31 C54
R366 R360
C60
R363 C336
IC60 -VCON
C343
Q58
C342
S53
R429 R428
S53
[LOWER KEY] [UPPER KEY]
J52 J51
EP51 C334
C391 R408
R128 C226
C231 C227
C393
R126 R127 R125
C225 C228
C233
R412
R418
Q64
Q63
R416
-RSSI
R414
C220
D21
R102
D55
R101
R103
R123 C218
C197
L14
C192 C194 R105
D28 D26
C180
C184
C179
R112 C189 R110 C183
C177
C203
D24 C176
C201 R159
C182 L13
T1-
R156 R104
D22
S5V
R6
C172
C171
C38
D3
Q2
C39
L6
L48
C45
C13 C12
L8
R29
MP5
C52
APCV
TMUT- PDET-
S52
C388
S52
[PTT SWITCH]
The combination of top side and bottom side of this
R406
[VOLUME CONTROL]
IC55
C404
PWON
C401
[ROTARY SELECTOR]
C9
C8 C5
L3
R5
C6
R4 R2
R3 C3
L1
R1
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