Terminal Function - Kenwood NX-300S Service Manual

NX-300(S)
Control unit (X53-4432-75)
Pin No. Name I/O
1 ME -
2 EMC I
3 SP+ O
4 SP+ O
5 SP- O
6 SP- O
7 6_/KEYI1 -
8 6_/KEYO2 -
9 BL_SB -
10 6_/KEYO0 -
11 6_/KEYO1 -
12 BL_SB -
13 6_/KEYI0 -
14 AGND -
1 33A O
2 VOL_GND -
3 VOL I
4 EN3 I
5 AGND -
6 EN4 I
7 EN1 I
8 EN2 I
9 +B O
10 SB1 I
1 LED_G O
2 /EMG I
3 LED_R O
4 IFC I
5 /SAVE O
6 I2CCK O
7 /5TC O
8 I2CSDA I/O TCXO thermometer data input/output
9 SBC O
10 /T_R O
11 TV2 O
12 ASSIST O
13 TV1 O
14 VAGC I
15 5RC O
TCXO_
O
16
MOD
17 PGND -
54

TERMINAL FUNCTION

Function
CN23
Internal MIC GND
Internal MIC input
BTL output + for internal speaker
BTL output + for internal speaker
BTL output – for internal speaker
BTL output – for internal speaker
No connection
No connection
No connection
No connection
No connection
No connection
No connection
GND
CN403
3.3V for volume level
GND for volume level
Volume level input for audio control
Rotary switch input
GND
Rotary switch input
Rotary switch input
Rotary switch input
Power output after passing through the
fuse
Power input after power switch
CN404
Green LED control output
Emergency (Orange) key input
Red LED control output
TX-RX PCB version recognition input
50C Reg. control output
TCXO thermometer clock output
50T Reg. switch control output
SB3 switch control output
TX/RX control output
RX tuning voltage 2 output
VCO tuning voltage output
RX tuning voltage 1 output
AGC voltage input
50R switch control output
TCXO modulation output
GND
Pin No. Name I/O
18 RSSI I RSSI voltage input
19 PGND - GND
20 CV I CV voltage input
21 AGND - GND
22 NC - No connection
23 NC - No connection
24 +B I Power input after passing through the fuse
25 +B I Power input after passing through the fuse
26 +B I Power input after passing through the fuse
27 +B I Power input after passing through the fuse
28 NC - No connection
29 NC - No connection
30 AGND - GND
31 /PTT I PTT input
32 Side_G O Key matrix output (SIDE1,2 key)
33 Side_1 I Key matrix input (SIDE1 key)
34 W_/N O W/N control output
35 SDO1 O PLL serial data output
36 Side_2 I Key matrix input (SIDE2 key)
37 /PCS_RF O PLL enable output
APC voltage discharge switch control
38 /DSW O
output
39 APC O APC control voltage output
40 /APCSW O APC switch control output
41 VCO_MOD O VCO modulation output
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
Function