Kenwood TKR-740 Service Manual page 65

TKR-740
CONTROL UNIT (X53-3882-71)
CN702
Terminal Terminal
No. name
1 SPI Local speaker input
2 SPG Local speaker ground
3 VLO AF volume control output
4 VLI AF volume control input
5 GND Ground
6 BLT M ic connector J700 (1pin)
7 8C 8V constant voltage
8 HOK Hook-sw itch
9 PTT Press-to-talk-sw itch
10 EXR External reference indicator
11 SW1 Programable sw itch S705
12 SW2 Programable sw itch S704
13 B Pow er supply (Vcc)
14 B Pow er supply (Vcc)
15 SW3 Programable sw itch S703
16 SW4 Programable sw itch S702
17 TEST Test sw itch
18 SW5 Programable sw itch S701
19 SW6 Programable sw itch S700
20 EN7 Shift register enable signal
21 M DAT M ic connector J700 (8pin)
22 DT Serial data for IC703
23 CK Common serial clock
24 GND Ground
25 M I M icrophone signal
26 M IG M icrophone ground
CN703
Terminal Terminal
No. name
1 SPG Internal Speaker ground
2 SP Internal Speaker AF output
CN705
Terminal Terminal
No. name
1 VLO AF signal for VR701
2 VLI AF signal from VR701
3 GND Ground
4 BLT M ic connector J700 (pin1)
5 B Pow er supply (Vcc)
6 GND Ground
7 PTT Press-to-talk sw itch
8 M IG M icrophone ground
9 M IC M icrophone signal
10 HOK Hook signal
11 M DAT M ic connector J700 (pin8)
12 NC No connection
13 NC No connection
14 NC No connection
66
TERMINAL FUNCTION
Terminal function I/ O
Terminal function I/ O
Terminal function I/ O
CN706
Terminal Terminal
No. name
1 NC
I
- 2 SW6
O 3 NC
4 SW5
I
- 5 NC
6 SW4
O
I 7 M DAT
8 SW3
O
9 HOK
O
I 10 SW2
11 M IC
O
O 12 SW1
13 M IG
I
I 14 B
15 PTT
O
16 5A2
O
O 17 GND
18 5B2
O
O 19 B
20 EN7
I
O 21 BLT
22 CK
I
23 GND
I
- 24 DS
25 VLI
O
- 26 GND
27 VLO
28 NC
29 NC
30 NC
-
O
I
O
-
-
I
-
O
-
O
O
-
-
-
-
Terminal function
No connection
Sw itch S700 signal
No connection
Sw itch S701 signal
No connection
Sw itch S702 signal
M ic connector J700 (pin8)
Sw itch S703 signal
Hook signal
Sw itch S704 signal
Local mic signal
Sw itch S705 signal
Local mic ground
Pow er supply (Vcc)
Press to talk sw itch
5V constant voltage A
Ground
5V constant voltage B
Pow er supply (Vcc)
Shift register enable
M ic connector J700 (pin1)
Common clock
Ground
Serial data from IC703
AF signal for VR701
Ground
AF signal from VR701
No connection
No connection
No connection
I/ O
-
I
-
I
-
I
-
I
I
I
I
I
-
O
I
O
-
O
O
O
-
O
O
I
-
O
-
-
-