Motorola_Micom-XL_维修维护电器原理图手册_1994

MOTOROLAMAINTENANCE1.INTRODUCTION3.When servicing a MICOM.XL radio,you must be equipped with the pro-This section provides maintenance,calibration,andgramming module FLN6304 (optiontroubleshooting instructions.S86),so as to be able to program theradio to all frequencies used in thetests.2.RECOMMENDED TEST EQUIPMENT3.PREVENTIVE MAINTENANCEItemModel3.1VISUAL INSPECTIONSpectrum AnalyzerHP 8568BCheck that all external surfaces of the equipment areSignal GeneratorHP 8657Afree of dirt.Inspect all connecting cables for damageor loose connections.Frequency CounterHP 5327CIf the equipment is dirty,wash the external surfacesMultimeterFLUKE 8000Awith mild soap and water using a clean cloth.Be care-ful!Never allow electronic components or connectorsAudio GeneratorHP 204Cto get wet.OscilloscopeTEKTRONIX 4653.2PERFORMANCE TESTSAudio AnalyzerHP 8903BAt initial installation and yearly thereafter,perform thepower output,half-power output,'tune'power outputPower MeterHP 438Atransmitter tests and the 10 dB SINAD and half-powersensitivity receiver tests.The tests should be performed30 dB/150 W CoaxialBird 8322on several channels covering the 1.6-30 MHz frequencyAttenuator*range unless otherwise specified.It is recommended tocheck at 1.6 MHz and at the end of each range of the10 dB/1 W AttenuatorBird8302-100harmonic filter(refer to paragraph 3.5 in the Theory ofOperation section of this manual).The readings of eachmay be used as Dummy Loadtest should be recorded and compared with previousreadings to detect any possible deterioration.NOTESThe radio's frequency should be checked and cali-1.It is possible to perform the adjust-brated after the first,third,sixth,and twelfth months,andments with the Motorola R2200 oryearly,thereafter.If the crystal is replaced,the aboveR2600HS communications systemschedule should be repeated for the first year.analyzer.For accurate frequency cal-ibration,a reference source of atThe frequency accuracy of the radio depends only onleast +0.05 PPM is recommended.the frequency accuracy of the 9.105 MHz referenceoscillator,located on the A board (see Figure 2 in the2.Equivalent test equipment may beDescription section of this manual).The oscillator hasused.a normal aging of maximum 1 PPM/year.It is thereforeLand Mobile Products Sector68P02940C99-01301 E.Algonquin Road,Schaumburg.IL 60196©Motorola Inc.,1991April,1994