Kenwood NXR-700H Service Manual

NXR-700H18the VCXO (X301) control voltage and modulating signal.IC301 is a reference voltage generator (A/2) in modulat-ing level adjusting circuit and non-inverting amplification ofmodulating signal with a cutoff signal of approximately 9kHz(B/2).ControlunitTX Mod 19.2MHzPLL circuitVCXO_CVTX mainPLL circuitVCO_MODModsignalCN8044 1IC304IC308 (B/2)5V #2 IC301(B/2)5V #2IC305(A/2)IC305(B/2)5V #25V #25V #2TX Mod 19.2MHzPLL CP3210Fig. 7 Modulation level adjustment circuit / 图 7 调制电平调整电路2-8. AVR circuitIC104, IC603, IC704, IC705, IC706, IC807, IC808 andIC809 are AVR ICs.Each circuit contains its own power regulator IC to main-tain isolation between circuits.CIRCUIT DESCRIPTION / 电路说明I C301 是调制电平调整电路和调制信号的非反相放大中的基准电压发生器 (A/2)，截止信号约为 9kHz(B/2)。2-8. AVR 电路I C104、I C603、I C704、I C705、I C706、I C807、I C808 和IC809 是 AVR IC。每个电路都含有各自的功率调节器 I C，以保持电路之间的隔离状态。CN801VBATT +13.2V IC704IC809SWRipplefilterIC807IC706IC705 IC603IC104IC808 8V #18V #28V9VCN8078V #2OCXO9V’8V #18V #1’5V #15V #25V #33.3VFig. 8 AVR circuit / 图 8 AVR 电路2-9. Other circuitsIn addition, IC702 is an EEPROM. The transmitter ad-justment data adjusted for each unit is written into theEEPROM. If the unit is installed in another set, it is not nec-essary to adjust it again from the beginning, but only fine-tuning is necessary for each unit.The temperature sensor (IC804) monitors the tempera-ture of the transmitter unit (X56-311 A/3).2-9. 其它电路此外，I C702 是一个 E E P R O M。对各单元调整的发射机调整数据被写入 E E P R O M。如果将单元安装在另一装置中，不需要从头开始重新调整，而只需要对各单元进行微调。温度传感器 ( I C804) 监测发射机单元 ( X56-311 A /3) 的温度。