Kenwood NXR-800 Service Manual

Also see for NEXEDGE NXR-800: Brochure Instruction manual Instruction manual Instruction manual Instruction manual

Contents

NXR-80018SW +8V+5VCN44+B Q52SWQ32IC24+5VIC16+5VIC17+5VIC18+3VIC10+3.3VIC22+5VQ9Q27Q6IC19+8VIC25Q18,231st local amplifiersIC142nd IF amplifierIC19Pre-scalerQ21,532nd local amplifiersIC13IF systemICQ19,28WIDE passSWQ25Q20,29Narrow passIC15IC12IF system ICQ1LNA (Collector)Q1LNA (Emitter)+9VIC26+9VIC27+5VIC701–5VIC702–3VIC703IC5,111st/2nd PLLʹsIC7DDSQ17,331st/2nd VCO buffer amplifiersQ7,81st local VCOʹsQ242nd 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 (pin1) (detected by the IF systemIC (IC12)) and the 1st-VCO_A, VCO_B control voltage (pin2,pin3).IC30 monitors the 1st-VCO control voltage (pin16), theLNA current detection value (pin15), the temperature de-tected by the temperature sensor IC (IC35 pin14), the RSSIvoltage detected by the IF system IC (IC12 pin12), thesquelch voltage detected by the IF system IC (IC12 pin11),and the control voltage of the 2nd-VCO (pin10), and outputseach state in serial data (IC30 pin18), sends the signal fromCN42 (pin22) to the control unit (X53-413). The signal is pro-cessed by the MPU.IC332nd CVIC32A/21stVCO_A1stVCO_BIC12ASQLIC35TEMP.IC61st CVIC12RSSIIC4LNA10 181112141516IC30IC31EEPROM56126783IC23CN421198223230Fig. 23 Other circuitsFig. 22 AVR circuitCIRCUIT DESCRIPTION