Kenwood NXR-700H Service Manual

NXR-700H51Pin No. Name I/O Function19 SB O Power supply output20 NC - No connectionCN60 (To Internal Speaker)1 SPO O Internal speaker AF output2 SPG - Internal speaker groundControl Unit (X53-4140-10)Serial data inable signal to potentiometer of OCXO unitPin No. Name I/O FunctionCN300 (To X55-309 CN43)RX_IF_VN I 2nd IF signal (450kHz) of NXDN modeCN302 (To X56-311 A/3 CN405)REF2(19.2MHz) I 19.2MHz reference clock input fromTX unitCN400 (To X56-311 A/3 CN805)1 GND - Ground2 GND - Ground3 REF_SW2 O Control signal for reference clockchange circuit4 WP O Write protection signal to EEPROM5 REF_SW O Control signal for reference clockchange circuit6 OX_SCL O ADC of OCXO unit (for electric currentdetection) to serial clock7 EXT_EXIST I External reference clock detection signal8 OX_SDA I/O ADC of OCXO unit (for electric currentdetection) to serial data input/output9 REF_EXIST I Reference clock detection signal10 IMP_H_L - No connection11 REF_IN_OUT O Control signal for reference clockchange circuit12 GND - Ground13 OX_SDI2 I Serial data input from potentiometer ofOCXO unit14 GND - Ground15 OCXO_VR_EN O Serial data enable signal to potentio-meter of OCXO unit16 GND - Ground17 OCXO_ON O Power source control of OCXO unit18 GND - Ground19 OCXO_CURR I Monitor of the voltage which detectscurrent of OCXO unit20 GND - Ground21 OCXO_EXIST I Detection signal of OCXO unit presence22 GND - Ground23 VCXO_DA_EN O DDS (5.99MHz) to serial data enablingsignal24 GND - Ground管脚号名称输入 / 输出功能19 SB 输出电源输出20 NC - 未连接CN60( 至内部扬声器 )1 SPO 输出内部扬声器 AF 输出2 SPG - 内部扬声器接地控制单元 (X53-4140-10)至 OCXO 单元电位计的串行数据启用信号管脚号名称输入 / 输出功能CN300( 至 X55-309 CN43)RX_IF_VN 输入 NXDN 模式的第 2 IF 信号 (450kHz)CN302( 至 X56-311 A/3 CN405)REF2(19.2MHz) 输入从 TX 单元的 19.2MHz 基准时钟输入CN400( 至 X56-311 A/3 CN805)1 GND - 接地2 GND - 接地3 REF_SW2 输出基准时钟改变电路的控制信号4 WP 输出至 EEPROM 的写保护信号5 REF_SW 输出基准时钟改变电路的控制信号6 OX_SCL 输出至串行时钟的 OCXO 单元的ADC( 用于电流检测 )7 EXT_EXIST 输入外部基准时钟检测信号8 OX_SDA 输入 / 输出至串行数据输入 / 输出的 OCXO单元的 ADC( 用于电流检测 )9 REF_EXIST 输入基准时钟检测信号10 IMP_H_L - 未连接11 REF_IN_OUT 输出基准时钟改变电路的控制信号12 GND - 接地13 OX_SDI2 输入从 OCXO 单元电位计输入的串行数据14 GND - 接地15 OCXO_VR_EN 输出至 OCXO 单元电位计的串行数据启用信号16 GND - 接地17 OCXO_ON 输出 OCXO 单元的电源控制18 GND - 接地19 OCXO_CURR 输入检测 OCXO 单元电流的电压的监视器20 GND - 接地21 OCXO_EXIST 输入 OCXO 单元存在检测信号22 GND - 接地23 VCXO_DA_EN 输出至串行数据启用信号的DDS(5.99MHz)24 GND - 接地TERMINAL FUNCTION / 端子功能