Kenwood TK-290-11B Service Manual page 42

K
TK-290-11B
5C
5R
RXOUT
RXIN
5M
5T
R601 C602
15k 0.1u
R612
330k
R668
330k
MIC
T/R
ETS2
ETS1
AUDIH
AF
36
X57-613 3/6
L
SCHEMATIC DIAGRAM
DTMF
DECODER
IC600
LC73872M
1 INPUT 14
VDD
2 NC1 13
NC3
3 PD 12
EST
4 OSCO 11
STD
5 OSCI 10
ACK
6 NC2 9
SD
7 VSS 8
LOAD
2.0V
IC601
TC75W51FUF
BUFFER
AMPLIFIER
R610 R618
56k 68k
R602 R611 C611
22k 180k 0.012u
R617
0
IC602
TA75W01FUF
ACTIVE
FILTER
R669
0
M
D/A CONVERTOR
IC603
M62364FP-F
C659
1
VIN1
2
0.1u
VOUT1
3
VOUT2
4
VIN2
5
VDD
6
LD
7
CLK
8
DI
MOD 9
VIN3
10
VOUT3
11
VOUT4
12
VIN4
R624 R628
33k 330k
R619
100
R621 R626
10k 100k
C619
330p
R615
10k
R622
22k
C660 R623 R629
10u6.3 330k 22k
IC605
TC75W51FUF
ACTIVE
FILTER/
SUMMING
AMPLIFIER
R635
39k
N
TX-RX UNIT (X57-6132-70)
5.0V
24
VIN8
23
VOUT8
22
VOUT7
21
VIN7
20
GND
19
RESET
18
VDAref
17
DO C679
16
VIN6
15 0.1u
VOUT6
14
VOUT5
13
VIN5
C661
0.1u
TONE
IC604
TC75W51FUF
SUMMING
AMPLIFIER/
BUFFER
AMPLIFIER
(J)
O
5C
5R
RXOUT
RXIN
TONE
5T
5M
MIC
MOD
T/R
ETS2
ETS1
AUDIH
DET