Kenwood TH-K20A Service Manual page 37

A B C D
TH-K20A/K20E
1
TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: E
Component side view (J79-0325-09)
2
3 D419
4
D421
5
6
D423
7
8
D425
R451
9
10
Ref. No. Address Ref. No. Address
IC300 6O Q302
11
IC301 8Q Q303
IC304 6P Q304
IC305 6M Q305
IC306 5N Q306
IC307 4P Q308
12
IC308 4N Q400
IC401 6J D300
Q300 6Q D301
Q301 5P D302
13
14
E F G H
PC BOARD
J79-0325-09
D418
D416
D420
D422
D417
R425
R447
D424
Ref. No. Address
Ref. No. Address Ref. No. Address
D424
5P D304 5N D414 10J
4O D305 9O D415 2J D425
7N D404 5C D416 4G D426
D417 8G D427
4O D405 5D
D418 3F
5P D406 5E
4N D407 5F D419 3D
7H D408 5D D420 5F
D421 5D
8O D409 5E
5M D410 5E D422 7F
5N D411 5E D423 7D
I J K
D415
76 75
100 51
1
50
C412 C411
25 26
C415
CN304 CN303
GND 5M
MODE RESET
D414
9F
9D
8R
7R
L M N O
PC BOARD
TX-RX UNIT (X57-821X-XX) 0-11: K 0-20: M 2-71: E
Component side view (J79-0325-09)
R443
MIC300
6
C383 R379
1 5C
5
C344
IC308
10
3
4
D304
C352
C367
D302
C358
3
4
IC306
C305
5
1
C365
C366
18 13
C354
19 12
5M
1 4
IC300
IC305
2 3
7
24
1 6
C364
R309
C363
C301
C329 R323
R308
C302
CN300
R310
2
SPK
C307
SPG
1
C356
R365 R360 C359
R364
D305
P Q R S
TH-K20A/K20E
R366
C372
5
IC307
C421
1
Q306
D
G S
D
R378
C360
R367
Q300
R357
C371
R336 C332
C335
C333 C337
R338 C336 C338
1 8
R470
IC304
4 5
R340 C339 R341
R314
R342
C341 C312
R315
D427
R318 C313
5 4
C340
IC301
8 1
D426
R312 R389
C425
R353
Component side
Layer 1
Layer 2
Layer 3
Layer 4
Foil side
1
2
3
4
5
6
7
8
9
10
11
12
13
14