Tx-Rx Unit (X57-7370-Xx A/2) - Kenwood NX-300 Service Manual

Pin No. Name I/O
42 THP I Thermistor voltage input
43 PLD I PLL lock detect input
44 38M O 38M output
45 SCK1 O PLL clock output
46 GND - GND
47 S_DET I Battery select input
48 GND - GND
49 NC - No connection
50 IF_DET I IF input
CN405
1 SSW I EXT/INT speaker switch input
2 SP+ O BTL output + for external speaker
3 SP- O BTL output – for external speaker
4 MSW I EXT/INT MIC switch input
5 EMC I External MIC input
6 ME - External MIC GND
7 PTT I External PTT input
8 PF I Programmable function key input
9 OPT I/O Option interface I/O
10 E - GND
11 5V O 5V output
12 TXD O Serial data output
13 RXD I Serial data input
14 NC - No connection
CN701 (for production)
1~20
CN710
1 OPT1 I/O
2 OPT3 I/O
3 26P_RD I
4 26P_TD O
5 NC -
6 OPT4 O
7 OPT10 O
8 OPT5 O
9 DGND -
Refer to "CN710 26-pin connector
10 AGND - specifi cation" described on pages
62 to 64.
11 AI I
12 AO O
13 AGND -
14 5V O
15 OPT9 I
16 DTI I
17 OPT8 I/O
18 OPT11 O
19 OPT7 I/O
TERMINAL FUNCTION
Function Pin No. Name I/O
20 OPT2 I/O
21 TXO O
22 RXEO O
Refer to "CN710 26-pin connector
23 RXEI I specifi cation" described on pages
62 to 64.
24 TXI I
25 OPT6 O
26 POW O

TX-RX unit (X57-7370-XX A/2)

Pin No. Name I/O
CN900
1 LED_G I Green LED control input
2 /EMG O Emergency (Orange) key output
3 LED_R I Red LED control input
4 IFC O TX-RX PCB version recognition output
5 /SAVE I 50C Reg. control input
6 I2CCK I TCXO thermometer clock input
7 /5TC I 50T Reg. switch control input
8 I2CSDA I/O TCXO thermometer data input/output
9 SBC I SB3 switch control input
10 /T_R I TX/RX control input
11 TV2 I RX tuning voltage 2 input
12 ASSIST I VCO tuning voltage input
13 TV1 I RX tuning voltage 1 input
14 VAGC O AGC voltage output
15 5RC I 50R switch control input
16 TCXO_MOD I TCXO modulation input
17 GND - GND
18 RSSI O RSSI voltage output
19 GND - GND
20 CV O CV voltage output
21 GND - GND
22 NC - No connection
23 NC - No connection
Power output after passing through the
24 +B O
fuse
Power output after passing through the
25 +B O
fuse
Power output after passing through the
26 +B O
fuse
Power output after passing through the
27 +B O
fuse
28 NC - No connection
29 NC - No connection
30 GND - GND
31 /PTT O PTT output
NX-300
Function
Function
59