Kenwood NXR-800H Service Manual

NXR-800H107■ External DC 13.2V Power Source applied to the NXR-700H Terminal / 将外部 DC 13.2V 电源施加于 NXR-700H 端子Refer to the power supply diagram sequence below. / 请参见以下电源图顺序。Audio AMP (IC29)LAN_IC (IC719)DSP_I/O (IC37)33BU33SHDC5018DSP DSP_Core (IC37)Switch (Q302)1.8V_AVR (IC18)3.3V_AVR (IC329)3.3V_AVR (IC15)3.3V_AVR (IC6)DC/DC converter(IC11, Q3)Main MPU I/O (IC703)Audio_circuitLED, OptionRF_Control_MPU I/O (IC34)RF_Control_MPU I/O (IC34)Rechargeable battery (BA300)SRAM (IC700), RTC (IC701)Main MPU_Core (IC703)Modem Control MPU (IC325)TX_Vocoder/RX_DSP_I/O(IC323/324)TX_Vocoder/RX_DSP_Core(IC323/324)15DSP33MPU33AUD15SH1.5V_AVR (IC306)1.5V_AVR (IC307)Switched byModem ControlMPU (IC325)50MPUDC8+B5V_AVR (IC16)DC/DC converter(IC10, Q2)Switched byModem ControlMPU (IC325)TROUBLE SHOOTING / 故障排除■ Initialization of the Modem control MPU (IC325) (normal oscillation of X301 and normal reset-unlock of IC303)■ 调制解调器控制 MPU(IC325)(X301 的正常振荡和 IC303 的复位解锁 ) 的初始化Refer to Traceability procedure for IC325. / 请参见 IC325 的追溯步骤。■ Unlocking “SYS_RST” Signal on the Modem control MPU (IC325) starts Up all Hardware Blocks■ 解锁调制解调器控制 MPU(IC325) 上的“SYS_RST”信号时，将启动所有的硬件区块Refer to the Reset circuit below. / 请参见以下复位电路。33BU33SH33SHIC700SRAMIC719LANIC703Main MPU33SH100K100K100KD16C_RST33SHIC70833MPUIC314IC325ModemControlMPU50MPUIC34RF Control MPU33SH33SH33MPUIC30333MPU33MPU33MPUDSP_RSTRESET_DIC324TXVocoderDSP33MPUIC323RXDSP50MPUIC3550MPUWPADSP_RSTIC37DSP33SHIC1750MPUEEPROMeachRF unit33SH33SHIC702Flash50MPU33SHfrom RTESYS_RST47K33MPU50MPUWPReset circuit / 复位电路