Terminal Function - Kenwood TKR-740 Service Manual

TKR-740
CONTROL UNIT (X53-3882-71)
CN1
Terminal Terminal
No. name
1 RA RX Audio (filtered signal)
2 RXG RX Audio ground
3 DET Detector audio
4 DEG Detector audio ground
5 SC Noise squelch control
6 RSSI RX signal strength indicator
7 CK Common clock
8 DT Common data
9 ESR Shift register strobe
10 EVR Electronic volume strobe
11 SCL RX EEPROM serial clock
12 SDA RX EEPROM serial data
13 DP PLL data signal
14 CP PLL clock signal
15 EPR RX main PLL strobe signal
16 LDR RX PLL lock detector
17 GND Ground
18 CVR RX main PLL lock voltage
19 NC No connection
20 NC No connection
21 B Pow er supply (Vcc)
22 B Pow er supply (Vcc)
23 B Pow er supply (Vcc)
24 NC No connection
25 NC No connection
26 NC No connection
CN2
Terminal Terminal
No. name
1 M OD M odulation signal
2 TO Signalling signal
3 M IG M icrophone ground
4 EVT TX electronic volume enable signal
5 EST TX shift register enable signal
6 DT Data signal for IC3 & IC4
7 CK Clock signal for IC3 & IC4
8 NC No connection
9 NC No connection
10 SDA RX EEPROM serial data
11 SCL RX EEPROM serial clock
12 LDT TX main PLL lock detector
13 PRT High temperature detect
14 CP TX both PLL clock signal
15 NC No connection
16 DP TX both PLL data signal
17 EXR Exit reference detector
18 CVT TX main PLL lock voltage
19 REV Reverse TX pow er detector
20 FWD Forw ard TX pow er detector
21 GND Ground
22 PAG Digital pager signal
23 B Pow er supply (Vcc)
24 B Pow er supply (Vcc)
25 B Pow er supply (Vcc)
26 PAB Pow er supply for AF PA IC
64

TERMINAL FUNCTION

Terminal function
Terminal function I/ O
CN3
Terminal Terminal
I/ O
No. name
1 SPI
I
2 SPG
-
3 VLO
I
4 VLI
-
5 GND
I
6 BLT
I
7 8C
O
8 HOK
O
9 PTT
O
10 EXR
O
11 SW1
O
12 SW2
I/O
13 B
O
14 B
O
15 SW3
O
16 SW4
I
17 TEST
-
18 SW5
I
19 SW6
-
0 EN7
-
21 M DAT
O
22 DT
O
23 CK
O
24 GND
-
25 M I
-
26 M IG
O
O
-
O
O
O
O
-
-
O
I/O
I
I
O
-
O
I
I
I
I
-
O
I
I
I
I
Terminal function
Local speaker input
Local speaker ground
AF volume control output
AF volume control input
Ground
M ic connector J700 (1pin)
8V constant voltage
Hook-sw itch
Press-to-talk-sw itch
Exit reference indicator
Programable sw itch S705
Programable sw itch S704
Pow er supply (Vcc)
Pow er supply (Vcc)
Programable sw itch S703
Programable sw itch S702
Test sw itch
Programable sw itch S701
Programable sw itch S700
Shift register enable signal
M ic connector J700 (8pin)
Serial data for IC703
Common serial clock
Ground
M icrophone signal
M icrophone ground
I/ O
O
-
I
O
-
I
O
I
I
O
I
I
O
O
I
I
I
I
I
O
I
O
O
-
I
-