PX-777维修手册

UHF/VHF FM TRANSCEIVERPX-777/328/338 SERVICE MANUAL------------------CONTENTS-------------------------- INTRODUCTION (2)GENERAL (2)REALIGNMENT (3)TROUBLE SHOOTING GUIDE (6)TECHNICAL SPECIFICATION ............................................. (7)FUNCTION SPECIFICATION (8)CIRCUIT DESCRIPTION (9)SEMICONDUCTOR DATA (16)PARTS LIST (17)BLOCK DIAGRAM (22)PCB BOARD (23)SCHEMATIC DIAGRAM (25)INTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techniciansfamiliar with similar types of commercial grade communicationsequipment. It contains all required service information for theequipment and is current as of the publication data. Changeswhich may occur after publication are covered by either ServiceBulletins or Manual Revisions. These are issued as required.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equipment information,the full part identification number should be included. Thisapplies to all parts : components, kits, or chassis. If the partnumber is not known, include the chassis or kit number of whichit is a part, and a sufficient description of the requiredcomponent for proper identification.PERSONNEL SAFETYThe following precautions are recommended for personnelsafety:DO NOT transmit until all RF connectors are verified secureand any open connectors are properly terminated.SHUT OFF and DO NOT operate this equipment nearelectrical blasting caps or in an explosive atmosphere.This equipment should be serviced by a qualified technician only.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and alignmentprocedures contained within.GENERALYour Transceiver is an electronic product of exact design and should be treated with care .The suggestions below will help you to fulfill any warranty obligations and to enjoy this product for many years.Do not attempt to open the unit. Non-expert handling of the unit may damage it.When using regulated power supply, take notice of power voltage must be between 6V and 8V to avoid damaging the unit.Do not store the Radio under the sunshine or in hot areas.High temperatures can shorten the life of electronic devices, and warp or melt certain plastics.Do not store the Radio in dusty, dirty areasKeep the Radio dry. Rainwater or damp will corrode electronic circuits.If it appears that the Radio diffuses peculiar smell or smoke, please shut off its power immediately and take off charger or battery in the Radio, then contact with PUXING agency.Do not transmit without antenna.REALIGNMENT1. MODE:USER MODE: For normal use, when turn on enter this mode.PC MODE: used to read and program radio.SELF-PROGRAMMING MODE: Hold down [MONI] and [menu] key accomplished by turning on the VOL/POWER switch until “SELF” displays.2.2. LCD DISPLAY3. SELF-PROGRAMMING MODEFor frequency,signal,feature write to the radioTECHNICAL SPECIFICATIONGeneralFrequency Range 136―174MHz，350—390MHz，400—470MHz,245MhzWorking Temperate －20℃―＋50℃Operating V oltage DC 7.2VOperate Mode Simplex or Semi-duplexChannel spacing 25Khz/12.5KhzDimension 100mm×55mm×32mm (Not included Antenna) Weight 220g (Including battery)Antenna impedance 50ΩTransmitterFrequency Stability ±2.5PPMOutput Power 5W/4W ±0.5WMax Frequency Deviation ≦5KHzAudio Distortion ≦3%Modulation Character +3dB—-3dBAdjacent Channel Power ≥65dBSpurious Radiation ≤7.5UWOccupied Bandwidth ≤16KHzReceiverRF Sensitivity ＜0.2UVAudio Distortion ≦3%Audio Response +2dB—-10dBAdjacent Channel Selectivity ≥60dBIntermodulation Rejection ≥60dBSpurious Response ≥60dBBlocking ≥80dBCPU PIN FUNCTION PX-777 ITEM DESCRIPTION I/O FUNCTION 1CLK ROM I/O CLOCK AND EEPROM2D0O Key scan output3D1O Key scan output4D2O PLL clock port/Key scan output5D3O PLL data port/Key scan output6PLL CS O PLL CS port7LAMP2O Lcd/backlight control output8K1I Key scan input9K2I Key scan input10K3I Key scan input11K4I Key scan input12AVDD MPU+5MV13RX0O IF output control port14RX1I IF input control port15TX1I MIC input control port16TX0O MIC output control port17BEEP/QT O BEEP output /CCTCS tone signal output18ACC MPU power filter19AVSS Connect to VSS20APC/TUNE O Automatic power &frequency automatic gain output 21AT X O Transmitter data output select control22AR X I Receiver data input/audio amplifier adjustment input 23BATT Test O Battery check /Reset24VOX I VOX input25AN SQL I Squelch signal input port26OSCin I Internal oscillator input27OSCout O Internal oscillator output28VSS GND29EN1I Encoder data input30EN2I Encoder data input31MONI I Monitor key input32Reset I CPU reset port33Vdd+5V power supply345TC O TX power supply control output35LED G O LED green36TXD/LED R O RX232 output/ LED red37AFC O Audio amplifier control input385CC O Power supply control output39P-AMP O Audio amplifier power supply control output40N/W/LD O Unlock detection41PTT/RX D I PTT key input/RX232 input42HT1621 CS I LCD CS port43LAMP1O Backlight control output44DQT O DTC audio signal outputFootprintComment Quantity 电容类备注C04020.5P 2C332C349C04021P 1C231C04021.5P 1C346C423C456C315C317_2C313_2C175C535C536C537C538C315_2C314_2C416C415CAP CAP C593CAP C387_1C318_1C316_2C312_2C326_1C227C121C132C135C133C142C144C156C223C222C322C612CAP R808C386_1C146C145C176C122C123C455C515C413C269C254C610C451C623CAP C633C529C528C613C450C665_1C105C581C520C701C174C181C244C247C321C351C668C454C621CAP C594C301C514C392C391CAPCAP C257C268C266C267C411C453C202C203C561C271C663_1C388_1C319_1C250CAP C103C101C573C571C511C521C182C208C316CAP C354C662CAPC302C418C102C147C661C201C131C0402105P 4C517C611C609C664C263C255C361C363C362C213C348C330C331C0402120P 1C259C040212P 3C224C241C359C040215P 1C113C040218P 318NHC523C246C04021P 2C327C329C264C265C394C513C512C592C591C0402222P 1C272C0402223P 2C421C417C0402224P 1C256C040222P 1C353C0402273P 3C414C556C555C040227P 1C134C0402332P 2C426C432C0402333P 1C516C0402220P 732103P C040237104P C0402PX777 part list(136-174MHz)33102P C0402C0402100P 12Designators 910P C0402C040233P 2C126C343C04023P 2C226C232C262C258C546C666C311C221C112C111C127C125C141C233C177C317C243C314C355C312C356C358C313C204CAP C310C412C622C632C531C534C533C180C260C532C173C667C0402473P 3C424C431C458C040247P 2C393C324C04025P 2C215C347C0402680P 2C428C433C0402683P 1C543C04026P 1C352C040282P 1C395C04028P 3C211C229C2350603电容C060310P 5C163C167C165C169C154C060315P 3C153C161C164C060320P 1C152C060322P 3C168C166R818C0603470P 1C162C060356P 1C155C06036P 2C325C344C0603104P 1L333太阳电诱C08050.1uF 4E367_1E364E411C541C08051uF 4E454E319_1C104C143C08052.2uF 4E435E413E363_1E474E412E242E326_1E180E311E273R0402电阻L121R457R663R364_1R363_2R235R134R362C251R662R04021.8K 1R365_1R413R301R524R113R131R363R321R314R352R594R595R269R547R529R528R391R351R459R809R223R258R429R434R453R201R543R184R333R203R111R561R101R361_2R820R040210R 4R458R127R125R354R541R582R392R172R175R174R173R170R171R583R0402150R 2R456R362_2R040215K 4R519R52215K R478C08054.7uF 6R04020R 10111410K R0402100R 150K C0402470P 359100K R0402R0402R040210R0402180K 2R265R263R040218K 2R414R187R573R591R593R251R254R411R666R312_2R313R667R668R417R596R393R04021K52R421R124R04021M 2R664_1R183R04021M82R428R433R04022.2K 1R261R04022.7K 1R259R0402220K 4R252R551R181R512R0402220R 6R389_1R331R348R312R571R244R040220K 3R544R472R436R040222K 4R552R415R313_2R515R040222R 2R112R315R0402270k 1R665R0402270R 3R156R155R358R040227K 3R556R141R555R255R452R451R455R202R302R103R516R04023.3K 3R367_1R366_1R264R040230K 2R422R177R0402330R 3R128R811R126R426R427R431R432R42333K R040239K 1R554R04023K34R435R355R359R357R04023K91R123R0402470R 1R572R0402470K 1R553R518R592R525R527R526R322R581R132R142R186R182R597R222R221R387R040247R 4R326_1R133R143R247R272R273R574R575R576R243R311R538R262R271L342L323R0402560R 3R412R368_1R110R040256K 2R311_2R517R04025K62R661R356R0402680K 1R416R0402680R 1R114R040268K 2R542R185R04026K81R424R040282K 2R521R523R06030R 3L591L133L331R1206电阻4K71282K2R04021K R0402R0402R0402633K R0402141547KR12060.393R104R105R106L0603电感L411L511L111L122100NH C697高频叠层L326_1L313L315L0603101T 1L521瓷珠L06031UH 1L391L0603220NH 5R807L354L351L348L242高频叠层L060333NH 1L143高频叠层L060347nH 1L352高频叠层L0603560UH 1L392L06036.8UH 2L321L341L611L640L131L141L227瓷珠瓷珠L1008R124L325L343L248L316绕线L0805R221L155丰华绕线L13101uH 1L168太诱绕线L25201R02L246L132太诱绕线L080568NH 3L225L229L241高频叠层L0805R151L215绕线二极管类D_ESC B94D322D321D342D341D_ESC HSC2774D212D235D211D111D_SMA 1SR154-4001D611D_USC 1SV2201D323D_USC MA771D155D0603GREEN 1D571D0603RED 1D573D-ESC PMSD41482D312_1D311D-USC 3V 1R806D-USM-MA742MA7421D661_1集成类SOP824C161U561SOP8LM45581U411SOT243SK2412T241T221SOT892SC49881T121SRP810K 1PR511SRP81K 2PR752PR311 1SSOP10-P-225TA7368F 1U451SSOP16-225TA311361U261SSOP8LM2904V 1U170U-SSOP20-225LMX23321U311_1三极管类T_ESM 2SC46173T311T421T431T_ESM 2SJ2431T312T_ESM 2SK18241T541T_ESM DTA114EE 2T261T573T_ESM DTC114EE 3T451T571T572L08059100NH 5101T L0603T_SOT892SK30781T131T_SOT895V2U631U621T_TSM2SK508NV2T331T341T_USM2SC42152T251T3932SC4226T_USM2SC4226-R253T361T352T3512SC4226T_USM DTC114EE2T181T171T_TSM2SB6245T452T544T101T521T3012SK32762SK34761T141T_USM1SS3723D411T521T301T_USM2SC33561T111T_USM DTC114EE2T181T171T_USM MRF4971T411T_USV UMC41T313T-ESM-2SC47382SC47381T662BL放大最大T-ESM-DTA114EE DTA114EE1T661T-ESM-DTA114EE DTA114YE1T663电解类ECS2213100uF1E457ELA321610uF4E456E631E623E269晶体类CR_DS060332.768KHz1CR521CR_DS605529.250MHz1FL251FX-DS097114.4MHz1CR311_1可调类VR120810K1VR552VR120850K1VR471线圈类LC0423203T1L1510.4*1.5*3 LC0424244T1L1630.4*1.5*4 LC0424265T2L165L1670.4*1.5*5 L5T8T1L1420.31*1.5*8 LC0323266T2L211L2120.31*1.5*6其它类PEF450R15KR1450K1FL261QFP44QFP441U511ANT ANT1ANT111C28C281CR261JK-ST-106 2.5mm1JK591JK-ST-301 3.5mm1JK592JP-18-118PIN1C681SW-SKRE ANKEY2AN593AN591SW-SKRT ANKEY1AN592PDF 文件使用 "pdfFactory Pro" 试用版本创建。