Kenwood NXR-700 Service Manual

Also see for NEXEDGE NXR-700: Brochure Instruction manual Service manual Instruction manual Instruction manual

Contents

NXR-70018SW +8V+5VCN44+B Q52SWQ32IC24+5VIC16+5VIC17+5VIC18+3VIC10+3.3VIC22+5VQ9Q27Q6IC19+8VIC25Q18,231st local amplifiersIC142nd IF amplifierIC9Pre-scalerQ21,532nd local amplifiersIC13IF systemICQ19,28WIDE passSWQ25Q20,29Narrow passIC15IC12IF system ICQ1LNA (Collector)+9VIC26+9VIC27IC5,111st/2nd PLLcsIC7DDSQ17,331st/2nd VCO buffer amplifiersQ7,81st local VCOcsQ242nd local VCOQ2,4active loop filter4-9. Other circuitsOther circuits include the EEPROM (IC31), the temper-ature sensor IC (IC35), the DAC (IC23) and the ADC (IC30).IC31 saves various adjustment values of the receiver unit.IC35 is built-in for detecting changes in temperature. IC23offsets the RSSI voltage (pin 1) (detected by the IF systemIC (IC12)) and the 1st-VCO_A, VCO_B control voltage (pin 2,pin 3).IC30 monitors the 1st-VCO control voltage (pin 16), theLNA current detection value (pin 15), the temperature de-tected by the temperature sensor IC (IC35 pin 14), the RSSIvoltage detected by the IF system IC (IC12 pin 12), thesquelch voltage detected by the IF system IC (IC12 pin 11),and the control voltage of the 2nd-VCO (pin 10), and outputseach state in serial data (IC30 pin 18), sends the signal fromCN42 (pin 22) to the control unit (X53-413). The signal isprocessed by the MPU.IC332nd CVIC32A/21stVCO_A1stVCO_BIC12ASQLIC35TEMP.IC61st CVIC12RSSIIC4LNA10 181112141516IC30IC31EEPROM56126783IC23CN421198223230Fig. 23 Other circuitsFig. 22 AVR circuitCIRCUIT DESCRIPTION