Philips-PET-744-Service-Manual电路原理图.pdf

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1、DVD Portable Player PET744 Published by BU AVM BL Printed in the Netherlands Subject to modification 3141 785 33611 Version 1.1 TABLE OF CONTENTS Chapter Technical Specification fr Reparaturen sind Original-Ersatzteile zu verwenden.ILe norme di sicurezza esigono che lapparecchio venga rimessonelle c

2、ondizioni originali e che siano utilizzati i pezzi di ricambioidentici a quelli specificati.“After servicing and before returning set to customer perform aleakage current measurement test from all exposed metal parts toearth ground to assure no shock hazard exist. The leakage currentmust not exceed

3、0.5mA.“CLASS 1LASER PRODUCT3122 110 03420GB Warning !Invisible laser radiation when open.Avoid direct exposure to beam.S Varning !Osynlig laserstrlning nr apparaten r ppnad och sprrenr urkopplad. Betrakta ej strlen.SF Varoitus !Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiinankymttm

4、lle laseristeilylle. l katso steeseen!DK Advarse !Usynlig laserstrling ved bning nr sikkerhedsafbrydere erude af funktion. Undg udsaettelse for strling.SAFTY NOTICEPlug the AC line cord directly into a 120V AC outlet (donot use an isolation transformer for this check). Use anAC voltmeter, having 500

5、0 per volt or more sensitivity.Connect a 1500 10W resistor,paralleled by a 0.15uF150V AC capacitor between a knomn good earth ground(water pipe, conduit, etc.) and all exposed metal parts ofcabinet (antennas, handle bracket, metal cabinetscrewheads, metal overlays, control shafts, etc.).SAFTY PRECAU

6、TIONSLEAKAGE CURRENT CHECKMeasure the AC voltage across the 1500 resistor.The test must be conducted with the AC switch on andthen repeated with the AC switch off. The AC voltageindicated by the meter may not exceed 0.3V.A readingexceeding 0.3V indicates that a dangerous potentialexists, the fault m

7、ust be located and corrected.Repeat the above test with the DVD VIDEO PLAYERpower plug reversed.NEVER RETURN A DVD VIDEO PLAYER TO THECUSTOMER WITHOUT TAKING NECESSARYCORRECTIVE ACTION.READING SHOULD NOT EXCEED 0.3VDVD VIDEO PLAYERAC OUTLETAC VOLTMETERTest all exposed metal.Voltmeter Hook-up for Lea

8、kage Current Check0.15uF 150V AC150010W(5000 per voltor more sensitivity)Good earth groundsuch as a water pipe,conduit, etc.The lightning flash with arrowhead symbol, within anequilateral triangle, is intended to alert the user to thepresence of uninsulated “dangerous voltage“ within theproducts enc

9、losure that may be of sufficient magnitude toconstitute a risk of electric shock to persons.The exclamation point within an equilateral triangle isintended to alert the user to the presence of importantoperating and maintenance (servicing) instructions in theliterature accompanying the appliance.Whe

10、nthepowersupplyisbeingturnedon,youmaynotremovethislasercautionslabel.Ifitremoves,radiationoflasermaybereceived.2.1 ESD PROTECTIONPREPARATIONOFSERVICINGPickupHeadconsistsofalaserdiodethatisverysusceptibletoexternalstaticelectrocity.Althoughitoperatesproperlyafterreplacement,ifitwassubjecttoelectrosta

11、ticdischargeduringreplacement,itslifemightbeshortened.Whenreplacing,useaconductivemat,solderingironwithgroundwire,etc.toprotectthelaserdiodeformdamagebystaticelectricity.Andalso,theLSIandICaresameasabove.SolderingironwithgroundwireorceramictypeGroundconductivewriststrapforbody.ConductivematTheground

12、resistancebetweenthegroundlineandthegroundislessthan101M3.0 INSTRUCTION FOR USE Disassembly Procedure on PET744Remove seven screws on back cabinetto separate top cabinet and backcabinet.screws 7pcsGenerally open the front cabinet.Remove six screws and disassemblethe connecter on the Main board.screw

13、s 6pcs.connecter 5pcs.4.0 MECHANICAL INSTRUCTIONRemove nine screws on the Key boardand DVD LOADER.Remove three screws on the Batteryand Battery board.Remove the speaker grill and 4pcsscrews. .Remove the 2pcs screws on the TFTand IR board.5.0 TROUBLESHOOTING SYMPTOM: NO IMAGE / NO SOUND SYMPTOM: NO I

14、MAGE OUTPUT ( THE PANEL SHOW BLUE PICTURE)StartCheck the external AV Cable TYPEnoteand connection is OK?Replace DVD DriveCheck DVD Drive work?Replace Main BoardExchange AV cableNOTE: AV Cable TYPE from outside to Inside L-Audio, R-Audio, Video, GroundnoyesnoyesSYMPTOM: NO SOUND COMES FROM SPEAKERStartCheck the Connection OK? ReinsertionCheck speaker OK?Replace Main BoardChange the speakernoyesnoyes