Kenwood TM-281A Service Manual page 45

A B C D
TM-281A
PC BOARD
1
TX-RX UNIT (X57-8130-XX) (A/2): TX-RX SECTION
-10: K -21: M2 -22: M3 -23: M4
Component side view (J79-0316-09 A/2)
2
3
4
5
6
7
1
8
IC715
Q715
9
10
10
11
12
J79-0316-09 A/2
13
14
E F G
F701
+B
C826
FB
R821
GND
R820 C828
C833
Q713
Q707
D712
D710
BSB
C815
O R762
IC712
R756
I Q703
G Q702
1 8 C766 C764
X701
C772 R759
4 5
C771
R754
UL
25 1
26 100 RESET
TD1
CNVSS
RD1
R777
SCLK
L702
R842
BUSY
R748
R844 5M
R751
TXD
R750
IC707
RXD
R823
EPM
CE
50 76
C824 51 75
R815 C769 C765 R760 R755
C809
C805 C768
ADJ
GND
DTMFIN
GND
POWER
CN702
H I J K
IC302
1 2
L312
C356 L313
R336 C355
C338 C350
L314
TEMP1
R828
TEMP2 R829
8T
8C
5C
R2
R3
R4
R786
R787
C783 R792
C777
Q706
CV
C789
R791
SQIN
R793
C848
R503
R506
D502
L M N O
PC BOARD
TX-RX UNIT (X57-8130-XX) (A/2): TX-RX SECTION
-10: K -21: M2 -22: M3 -23: M4
Component side view (J79-0316-09 A/2)
3 4
C835
C345
C348
C354
C70
PC/TV
R535
8R
Q710
R812
C552
R527
C559
R526
C807
C534
AFV
C544
RSSI
C523
R519
Q502
C515
P Q R S
TM-281A
Ref. No. Address
ANT
IC302 3K
IC303 8P
IC707 9F
IC708 7E
IC711 6G
IC712 7F
IC715 9B
C418
Q502 11N
C417
Q506 8R
Q702 7F
D313
Q703 7F
C422
R378
Q704 10I
C416
Q705 10I
Q706 10I
Q707 6F
Q708 10O
Q710 10O
Q712 10E
C407
Q713 6D
Q714 5E
Q715 9D
C394
D301 7O
R341
R334
C395
R559
1 8
D305 8P
R339
4 5 D312 8Q
R345
R347
D313 5Q
C401 R558
D312
C577 D314 5R
D316 7Q
R557
D501 12K
C572
D502 12K
D503 11O
R835
D504 10O
R836
D710 6F
R837
D712 6F
C851
R838
GND BPF
Component side
Layer 1
Layer 2
Foil side
1
2
3
4
5
6
7
8
9
10
11
12
13
14