Icom IC-7400 Service Manual page 78

• RF UNIT (2/2)
J121
R541 R542
C143 C121 C541
MP121
VRX
C542 MP122
C144
D121 D122
D542
D541
L128
C500 W502
C529
L502
C501
L121 R122 C146 L501
Q501
R502
D123
R501 D501
Q121
L122
R123
D124
R124
C505
C503
C124
L129
C504
C122
R121 EP501
C123 TNV1
D161 C155
R157
W151
D153 D154
J151
D162
C156
R160 C157 L152 IC151 C154
8 IN 1
YGR D161
7 VCC
GND 2
6 GND
GND 3
5 GND
GND 4
OUT
C550
R161 R159 R158
L160 R162
D3
J1
R1 C2
RL1 D4
HRX
L1 Q1 Q2
D1 D2 R7
R4
R2
C3
C16
R3
C10
C1 R5
EP4
T8V
C15
R8V
EP5
D91
L92 L93 L94 C97 C98 D92
C90
C89
L91 C95 C100 L95 D102
C93
L96
C92 R91
C91
C94 C96
C99
C88
D101 B8
L102 C103
L101
L103
C102 C104
R101
C101
C105
B8W
D81
L82 C83 D82
L83
L81
C82 D42
C84
R81
C85
C81
B7
D41
L42 C43
L43
L41
C42 C44
R41
C41 C45
B3
R548
R547 Q541
R549
R543 R545 R546
4
R544
C543
5
C544 C546 C547 C548
6
C545 D546
D543
D545
D544
D548
D547
EP549
R8VL
R506 W520
R508 C521
C509
R504
C518 L506
C513 C517
C514
R509 L505
C510 L507
Q502
L504 R510
L503
C512
R505
C508
R507
D503 D504
R503
C515
C519
C511
EP502
TNV2
C507 D502
PR3S
EP503
TNV1
EP120
ATTC
R8V
8VL
5V
T8V
C161 R165 EP150
R166
R163
R164 D163
L151
Q161
R151
D164 D165
R155 R153 D151
R152
EP548
Q162
R154
C152
C153
C150 C151
Q163
R156
C17
R12 L11 L12
D11
C5 C7 C13
R11
R15
L2 C6
R13
R6
L4
C11 C14 L14
C4 L3
C12
B0
EP6
ATTC
T8V
R8V
PRE1
PRE2
D21
POFF
L22 C23
L23
L21
C22 C24
C21
R21
C25
D111 IC161 B1 D22
C112 C113 C114 C116 C117
2
3 1 D112
L115
L112
R113 4 C115
L114
L113
C120 C119
R112
C110
C118
R111
C111 C109
B9T
D51
L52 C53 D52
L53
L51 C52 C54 D62
R51
C55
D61 C51 B4
L62 C63
L63
L61
C62
C64
R61
C61 C65
B5
D71
L72 C73 D72
L73
L71
C72 C74 D32
R71
C75
C71
B6
D31
L32 C33
L33
L31
C32
C34
R31
C35
C31 B2
3
2
1
MP282
W521
MP281
R511 L286 L285 C286 L290 D271 L289
R289
B
9
R291
R C288 C291
C528 C298
C289 C287
EP504
C290
C312
C530
L510
C300
R307
R308
C311
-8VL
T8V
ALC
VCO3 L181 L182
L184
Q181
L183
R181
C185
C181
C182
D281 C183
R182 Q182
R183
R184 R185
14V R186
D183
D181
C192 R192 C193 C195
R194
C171 D184
D182 IC191
R196
8 GND 1
7 BYPS R195
R191 SETE 2
6 BYPS
OUT 3 R193
5 IN
VCC 4
L191 SETC
R171 C198
L171
C196
C191
C197
8VL C194
L192
MP181
D171 D172
R173
L172
C173
C172
C174
R172
EP510
R8VL
14VL
AGC
DRIV
VCO3
MP301
1 2 3 4
EP180 L180
EP7
EP9
C9
IC323
B0 R335 18 IN1 1
O1
17 IN2 2
B1 R336
O2
R337 16 IN3 3
B2
O3
B3 R338 15 IN4 4
O4
B4 R339 14 IN5 5
O5
B5 R340 13 IN6 6
O6
B6 R341 12 IN7 7
O7
11 IN8 8
B7 R342
O8
10 VS 9
R328 R332 R333 R334 GND
R327 R329 R330 R331
R325
C323
IC324
B8 R351 18 IN1 1
O1
B8W R352 17 IN2 2
O2
16 IN3 3
B9R R353
O3
B9T R354 15 IN4 4
O4
PRE1 R355 14 IN5 5
O5
PRE2 R356 13 IN6 6
O6
POFF R357 12 IN7 7
O7
11 IN8 8
ATTC R358
O8
10 VS 9
EP358 GND
R326
R344 R349
R345 R346 R347 R350
R343
C324
R274
C275 W271
R279
L272 Q271
C272 L271
R277
L288 D272
R271
C296 R272
R273
R276
C293
C273
C278
C292 R275
C271
C276
R278
DRIV C258
C277
D251
C229
L232 W231
MP213 D252
W221
C231
Q231
R233
L231
W222 1 2 3
C236 R251
C235
R231
D136 W223
C232
W224
L233
MP211
D137
W225
R212
Q211
L217
C217 C220
R218 R215
L213
C221 C225
C219
R211
EP214
L214
L210
D211
L211 L212
C212 Q212
C218
C234
C214
R213
C216 C226 R214
C213
C233
C211 C215
L305 L304
D301 C318 D303 R316
D308
C309 C307 D305
C305
EP303 C308 C306
D302 D304
L311
R315 L302
L307 L306 D306
L308 EP305
C330 R309
EP304
C316 C314
R310
C331
R306
C317
R312
R311 C315 C313 C303
EP301
R313
C319
L303 R305
C329
R314 EP306 C328
EP302
C304
C320
C310
CP16
DRIV
AGC
ALC
R8V
EP8
8VL
5V
T8V
-8v
L5
Q328
D307
C326
C8
C327
R359
Q303
Q302
1
IC321 6
B0S 4
Q1 . STR
5
B1S
Q2
6
B2S
Q3 CLK
B3S 7
Q4
B4S 14
Q5
B5S 13
Q6
B6S 12
Q7
11
B7S
Q8
9
QS
5V 10
QS
.
8
L6
1
IC322 6
B8S 4
Q1 . STR
B8WS 5
Q2
6
R324 B9S
Q3 CLK
R321 PR1S 7
Q4
R322 PR2S 14
Q5
PR3S 13
Q6
ATTS 12
Q7
11
Q8
9
QS
10
QS
Q324 .
C325 8
Q325
NOTICE: Refer to the PARTS LIST for the value and name of each component.
12 - 8
J262
R262
R261
R263
MP261 EP261
P261
2IF
1 2 3
MP261
J261
L262
L261 D261 L263
C263
C261
C262
C264
R264
C265
R253
C256
D255
L253 D253
L251
FI231A FI231B
D256
D254
L252
R252
L242
C249
C251 C253 C254
C252 C257
C255
R254
C241
L215
MP212 C244
R241
C222
Q241
R255
R250
L241
EP217
R242
C248
R219
R217
R216
C250
C228
C242
C245
C230
EP242 R243 R244 C246
C243 R249
R248
EP216 R245 R246
AGC
L216
C224
MKR
C247
W201
C201
Q243 Q242
C240
R202
PLL BLOCK
R303
VCO3
MKR
Q301
C301
1LO
5V_CAL
C302 R304 R302 R301
L301
J401
L401 EP401
C401
W302 W303 C403
KEY
C402
EP402
CP7 CP8 CP5 CP6 CP1 CP2 CP3 CP4
DRIV
RMCK
22
AGC RMDT
21
RBST
20
ALC RDRS
19
DRIV
18
R8V RSKY
17
RTXS
16
8V _TNV1
15
_TNV2
14
5V AGC
13
T8V ALC
12
-8V GND
11
5V
10
GND
9
R8V
8
RTXS GND
7
T8V
6
GND
5
8V
4
GND
3
14V
2
-8V
1
J2
1 RBST
2
RMDT
D
3
RMCK
15 RDRS
OE
C321
CP9
CP15
CP11
CP12
CP14
1
T
2
D N
3 T
V CP13
N
15
1 V
OE
2
C322
EP11
EP10
T T
N N
V V
1 2