Kenwood NX-300S Service Manual

Also see for NEXEDGE NX-300: Brochure Instruction manual Instruction manual Instruction manual Instruction manual

NX-300(S)54TERMINAL FUNCTIONControl unit (X53-4432-75)Pin No. Name I/O FunctionCN231 ME - Internal MIC GND2 EMC I Internal MIC input3 SP+ O BTL output + for internal speaker4 SP+ O BTL output + for internal speaker5 SP- O BTL output – for internal speaker6 SP- O BTL output – for internal speaker7 6_/KEYI1 - No connection8 6_/KEYO2 - No connection9 BL_SB - No connection10 6_/KEYO0 - No connection11 6_/KEYO1 - No connection12 BL_SB - No connection13 6_/KEYI0 - No connection14 AGND - GNDCN4031 33A O 3.3V for volume level2 VOL_GND - GND for volume level3 VOL I Volume level input for audio control4 EN3 I Rotary switch input5 AGND - GND6 EN4 I Rotary switch input7 EN1 I Rotary switch input8 EN2 I Rotary switch input9 +B O Power output after passing through thefuse10 SB1 I Power input after power switchCN4041 LED_G O Green LED control output2 /EMG I Emergency (Orange) key input3 LED_R O Red LED control output4 IFC I TX-RX PCB version recognition input5 /SAVE O 50C Reg. control output6 I2CCK O TCXO thermometer clock output7 /5TC O 50T Reg. switch control output8 I2CSDA I/O TCXO thermometer data input/output9 SBC O SB3 switch control output10 /T_R O TX/RX control output11 TV2 O RX tuning voltage 2 output12 ASSIST O VCO tuning voltage output13 TV1 O RX tuning voltage 1 output14 VAGC I AGC voltage input15 5RC O 50R switch control output16 TCXO_MOD O TCXO modulation output17 PGND - GNDPin No. Name I/O Function18 RSSI I RSSI voltage input19 PGND - GND20 CV I CV voltage input21 AGND - GND22 NC - No connection23 NC - No connection24 +B I Power input after passing through the fuse25 +B I Power input after passing through the fuse26 +B I Power input after passing through the fuse27 +B I Power input after passing through the fuse28 NC - No connection29 NC - No connection30 AGND - GND31 /PTT I PTT input32 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 output35 SDO1 O PLL serial data output36 Side_2 I Key matrix input (SIDE2 key)37 /PCS_RF O PLL enable output38 /DSW O APC voltage discharge switch controloutput39 APC O APC control voltage output40 /APCSW O APC switch control output41 VCO_MOD O VCO modulation output42 THP I Thermistor voltage input43 PLD I PLL lock detect input44 38M O 38M output45 SCK1 O PLL clock output46 GND - GND47 S_DET I Battery select input48 GND - GND49 NC - No connection50 IF_DET I IF inputCN4051 SSW I EXT/INT speaker switch input2 SP+ O BTL output + for external speaker3 SP- O BTL output – for external speaker4 MSW I EXT/INT MIC switch input5 EMC I External MIC input6 ME - External MIC GND7 PTT I External PTT input8 PF I Programmable function key input9 OPT I/O Option interface I/O10 E - GND11 5V O 5V output