Icom IC-7800 Service Manual Addendum page 66

Dec. 2009
J141
• MAIN UNIT
(BOTTOM VIEW)
J1
SEND GND
RTTY
AF
13.8V
MOD
ALC SQLS
R144
R1
Q1
J140
R143
C148 C150
1 D 0 4 1 D 1 4
R152
R131
R130
C456
L455 C455
L454
C454
D450
C453
C499
C209
R522
C452
R557
R544
L450
R497
C402 C401
C450
R489
D490
Q490
J2 J3
J4
SEND GND 8V SEND GND SEND GND
RTTY
ALC BAND AF 13.8V
ALC BAND
MOD TRV MOD ALC SQLS N/C
R2
Q2
Q6
R9
R5
C23
Q4
C343 3 C 0 4 3 C 1 4 C363
Q3
R12
L340 L341
R11
L31
R33 R47
R138
IC490
R310 R318
R311 R319
R312 R320
R313 R321
R314 R322
R315 R323
R316 R324
R317 R325
R290 R298
R291 R299
R292 R300
R293 R301
R294 R302
R295 R303
IC450
R296 R304
R450
R341
C342
R451
IC451
J8
J5
R51
8V
TRV
Q7
IC50
L51
R96
R53
C68
D50
R95 R97 D65
C52 R52
C360 C71
L360 L361 D67
R94
IC61
D63
R92
D66 R99 C70
R224
R68
R226
L511
R553 R554
R214
R64
R216 Q506
R63
R84 R85
R556
C554
R83
D64
R555
D62
C556
R488 C65
C466 C465
R558
R467 R461
C205
R205
L526
C587
L524
R285
R284 R276
R283 R275
R282 R274
R281 R273
R280 R272
R279 R271
R278 R270
R399
R265 R257
R264 R256
R397
R263 R255
R262 R254
R261 R253
R260 R252
R259 R251
R258 R250
C362
R361
C490
J7
J6
J9
L52 C80
EP51
L80
L53
L56
MP503
R541
R543
R548 R545
MP501 Q504
C535
R808 R809
Q803
Q802
C840
C841
L529
C580 D806
C578 C590
R581 C589 R579
R833
R580
C567
C566
R567
L482
R575
MP551
D452
R577
C486
C668 C652 C636 C620 C604
C669 C653 C637 C621 C605
C487
C673 C656 C640 C624 C608
R452
L623 L618 L613 L608
L603
C672 C657 C641 C625 C609
C677 C661 C645 C629 C613
C676 C660 C644 C628 C612
L804
C806
R803 C815 R818
MP801
65
J496
J495
VCC GND
GND OUT IN VCC
L496
EP420
L418
R528
EP416
D501 R524
D502
R529 R585
L435
C435
C432 EP432
C431 EP431
C581
C430 EP430
R413
R415
R486
R417
R419
R421
C411 L411
C413 L413
C414
C416 EP415
R424
C803
R802