Memorex-MVD4540C-dvd-sm 维修电路原理图.pdf

SERVICE MANUALMVD4540CDesign and specifications are subject to change without notice.ORIGINALMFRS VERSION ADVD VIDEO PLAYER & VHS VIDEO CASSETTE RECORDERRadioFans.CN 收音机爱 好者资料库CAUTIONTHIS DIGITAL VIDEO PLAYER EMPLOYS A LASER SYSTEM.TO ENSURE PROPER USE OF THIS PRODUCT, PLEASE READ THIS SERVICE MANUAL CARE-FULLY AND RETAIN FOR FUTURE REFERENCE. SHOULD THE UNIT REQUIRE MAINTENANCE,CONTACT AN AUTHORIZED SERVICE LOCATION-SEE SERVICE PROCEDURE.USE OF CONTROLS, ADJUSTMENTS OR THE PERFORMANCE OF PROCEDURES OTHER THANTHOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.TO PREVENT DIRECT EXPOSURE TO LASER BEAM, DO NOT TRY TO OPEN THE ENCLOSURE.VISIBLE LASER RADIATION MAY BE PRESENT WHEN THE ENCLOSURE IS OPENED. DO NOTSTARE INTO BEAM.A1-1Location of the required MarkingThe rating sheet and the safety caution are on the rear of the unit.PREPARATION OF SERVICINGThe laser diode used for a pickup head may be destroyed with external static electricity.Moreover, even if it is operating normally after repair, when static electricity discharge is received at thetime of repair, a life of product may become short.Please perform the following measure against static electricity, be careful of destruction of a laser diodeenough at the time of repair, and work. It works on the desk which performed measures against static electricity, such as conductive mat. Soldering iron with ground wire or ceramic type is used. A worker needs to use a ground conductive wrist strap for body.CERTIFICATION: COMPLIES WITH FDA RADIATION PERFORMANCESTANDARDS, 21 CFR SUBCHAPTER J.RadioFans.CN 收音机爱 好者资料库IMPORTANT SERVICE SAFETY INFORMATIONSafety precautions to be followed during servicing:1.2.Parts marked with an are critical parts for safety. Replace only with the one described in the partslist.Before returning the DVD product to the customer, make the appropriate leakage current check orresistance measurements to ensure that exposed parts are properly insulated from the supply circuit.A leakage current check is recommended for this unit. Plug the AC line cord directly into a 120V 60Hz ACoutlet (do not use an isolation transformer for this check). Use a leakage current tester (Fig. 1) or ametering system which complies with Underwriters Laboratories (UL 1409). Measure for current from allexposed metal parts of the cabinet to a known earth ground: particularly, any exposed metal part having areturn path to the chassis. Any current measured must not exceed 0.5mA. Any measurement not withinthe limits outlined above are indicative of a potential shock hazard and corrective action must be takenbefore returning the unit to the customer.KNOWN EARTHGROUND1.5K ohm0.15 F(Reading should not be above 0.5mA)Leakage Current TesterTEST PROBETest all exposedmetal surfacesPRODUCT UNDER TEST2-Blade polarizedtype cord setFig. 1 AC Leakage TestA1-2A1-3IMPORTANT SAFEGUARDS1.2.3.4.5.6.7.8.8A.9.10.11.12.13.14.15.16.READ INSTRUCTIONSAll the safety and operating instructions should be read before the unit is operated.RETAIN INSTRUCTIONSThe safety and operating instructions should be retained for future reference.HEED WARNINGSAll warnings on the unit and in the operating instructions should be adhered to.FOLLOW INSTRUCTIONSAll operating and use instructions should be followed.CLEANINGUnplug this unit from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a dampcloth for cleaning.ATTACHMENTSDo not use attachments not recommended by the units manufacturer as they may cause hazards.WATER AND MOISTUREDo not use this unit near water. For example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wetbasement, or near a swimming pool.ACCESSORIESDo not place this unit on an unstable cart, stand, tripod, bracket, or table. The unit may fall, causing serious injury, and serious damage to the unit. Use only with a cart, stand, tripod, bracket, or table recommended by the manufacturer.An appliance and cart combination should be moved with care. Quick stops,excessive force, and uneven surfaces may cause the appliance and cartcombination to overturn.VENTILATIONSlots and openings in the cabinet and in the back or bottom are provided for ventilation, to ensure reliableoperation of the unit, and to protect it from overheating. These openings must not be blocked or covered. Theopenings should never be blocked by placing the unit on a bed, sofa, rug, or other similar surface. This unitshould never be placed near or over a radiator or heat source. This unit should not be placed in a built-ininstallation such as a bookcase or rack unless proper ventilation is provided or the manufacturers instructionshave been adhered to.POWER SOURCESThis unit should be operated only from the type of power source indicated on the rating plate. If you are not sureof the type of power supply to your home, consult your appliance dealer or local power company. For unitsintended to operate from battery power, or other sources, refer to the operating instructions.GROUNDING OR POLARIZATIONThis unit is equipped with a polarized alternating-current line plug (a plug having one blade wider than the other).This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plugfully into the outlet, try reversing the plug. If the plug should still fail to fit, contact your electrician to replace yourobsolete outlet. Do not defeat the safety purpose of the polarized plug. If your unit is equipped with a 3-wiregrounding-type plug, a plug having a third (grounding) pin, this plug will only fit into a grounding-type poweroutlet. This too, is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician toreplace your obsolete outlet. Do not defeat the safety purpose of the grounding-type plug.POWER-CORD PROTECTIONPower-supply cords should be routed so that they are not likely to be walked on or pinched by items placed uponor against them, paying particular attention to cords at plugs, convenience receptacles, and the point where theyexit from the appliance.LIGHTNINGTo protect your unit from a lightning storm, or when it is left unattended and unused for long periods of time,unplug it from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the unitdue to lightning and power line surges.POWER LINESAn outside antenna system should not be located in the vicinity of overhead power lines or other electric light orpower circuits, or where it can fall into such power lines or circuits. When installing an outside antenna system,extreme care should be taken to keep from touching such power lines or circuits, as contact with them might befatal.OVERLOADINGDo not overload wall outlets and extension cords, as this can result in a risk of fire or electric shock.OBJECT AND LIQUID ENTRYDo not push objects through any openings in this unit, as they may touch dangerous voltage points or short outparts that could result in fire or electric shock. Never spill or spray any type of liquid into the unit.PORTABLE CART WARNING(symbol provided by RETAC)S3125AA1-4IMPORTANT SAFEGUARDS(CONTINUED)OUTDOOR ANTENNA GROUNDINGIf an outside antenna or cable system is connected to the unit, be sure the antenna or cable system is groundedso as to provide some protection against voltage surges and built-up static charges. Section 810 of the NationalElectrical Code, ANSI/NFPA 70, provides information with respect to proper grounding of the mast and support-ing structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location ofantenna discharge unit, connection to grounding electrodes, and requirements for the grounding electrode.SERVICINGDo not attempt to service this unit yourself as opening or removing covers may expose you to dangerous voltageor other hazards. Refer all servicing to qualified service personnel.DAMAGE REQUIRING SERVICEUnplug this unit from the wall outlet and refer servicing to qualified service personnel under the followingconditions:REPLACEMENT PARTSWhen replacement parts are required, be sure the service technician uses replacement parts specified by themanufacturer or those that have the same characteristics as the original parts.Unauthorized substitutions may result in fire, electric shock or other hazards.SAFETY CHECKUpon completion of any service or repairs to this unit, ask the service technician to perform safety checks todetermine that the unit is in proper operating condition.WALL OR CEILING MOUNTINGThe product should be mounted to a wall or ceiling only as recommended by the manufacturer.HEATThe product should be situated away from heat sources such as radiators, heat registers, stoves, or otherproducts (including amplifiers) that produce heat.DISC TRAYKeep your fingers well clear of the disc tray as it is closing. It may cause serious personal injury.CONNECTINGWhen you connect the product to other equipment, turn off the power and unplug all of the equipment from thewall outlet. Failure to do so may cause an electric shock and serious personal injury. Read the owners manual ofthe other equipment carefully and follow the instructions when making any connections.SOUND VOLUMEReduce the volume to the minimum level before you turn on the product. Otherwise, sudden high volume soundmay cause hearing or speaker damage.SOUND DISTORTIONDo not allow the product output distorted sound for a longtime. It may cause speaker overheating and fire.HEADPHONESWhen you use the headphones, keep the volume at a moderate level. If you use the headphones continuouslywith high volume sound, it may cause hearing damage.LEASER BEAMDo not look into the opening of the disc tray or ventilation opening of the product to see the source of the laserbeam. It may cause sight damage.DISCDo not use a cracked, deformed, or repaired disc. These discs are easily broken and may cause serious personalinjury and product malfunction.NOTE TO CATV SYSTEM INSTALLERThis reminder is provided to call the CATV system installers attention to Article 820-40 of the NEC that providesguidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to thegrounding system of the building, as close to the point of cable entry as practical.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.a.b.c.d.e.f.When the power-supply cord or plug is damaged.If liquid has been spilled, or objects have fallen into the unit.If the unit has been exposed to rain or water.If the unit does not operate normally by following the operating instructions. Adjust only those controls thatare covered by the operating instructions, as an improper adjustment of other controls may result indamage and will often require extensive work by a qualified technician to restore the unit to its normaloperation.If the unit has been dropped or the cabinet has been damaged.When the unit exhibits a distinct change in performance, this indicates a need for service.A1-5EXAMPLE OF ANTENNA GROUNDING AS PER THE NATIONAL ELECTRICAL CODEANTENNADISCHARGE UNIT(NEC SECTION 810-20)ANTENNA LEADIN WIREGROUNDING CONDUCTORS(NEC SECTION 810-21)GROUND CLAMPSPOWER SERVICE GROUNDINGELECTRODE SYSTEM(NEC ART 250, PART H)GROUNDCLAMPELECTRIC SERVICEEQUIPMENTNEC-NATIONAL ELECTRICAL CODES2898AIMPORTANT SAFEGUARDS(CONTINUED)Before removing Pick Up PCB and DVD PCB connector, make the short circuit on the position asshown Fig. 1 using a soldering. If you remove the DVD Deck with no soldering, the Laser may bedamaged.WHEN REPLACING DVD DECK When the removal of the DVD Deck When the installation of the DVD Deck Remove all the soldering on the short circuit position after the connection of Pick Up PCB and DVDPCB connector.Fig. 1Make the sort circuitusing a soldering.Pick Up PCBA1-6TAPE REMOVAL METHOD AT NO POWER SUPPLYFig. 1Fig. 2PARENTAL CONTROL - RATING LEVEL4 DIGIT PASSWORD CANCELLATIONIf the stored 4 digit password in the Rating Level menu needs to be cancelled, please follow the steps below.Turn Unit ON.Press and hold the 7 key on the remote control unit.Simultaneously press and hold the STOP key on the front panel.Hold both keys for more than 3 seconds.The On Screen Display message PASSWORD CLEAR will appear.The 4 digit password has now been cleared1.2.3.4.5.6.Remove the Top Cabinet, Front Cabinet and DVD Block. (Refer to item 1 of theDISASSEMBLY INSTRUCTIONS.)Remove the screw 1 of the Deck Chassis and remove the Loading Motor. (Refer to Fig. 2)Rotate the Pinch Roller Cam in the direction of the arrow by hand to slacken the Video Tape.Rotate the Clutch Assy either of the derections to wind the Video Tape in the Cassette Case.Repeat the above step 34. Then take out the Video Cassette from the Deck Chassis. Be careful not toscratch on the tape.1.2.3.4.5.Main CamClutch AssyMain Chassis (Front Side)Loading MotorCapstan DD UnitPinch Roller CamScrew 1A1-71.2.3.Remove the Back Cabinet and TV/DVD/VCR Block. (Refer to item 1 of the DISASSEMBLYINSTRUCTIONS.)Rotate the Main Gear in the direction of the arrow by hand.(Refer to Fig. 1)Draw the Tray.DISC REMOVAL METHOD AT NO POWER SUPPLYFig. 1DVD DeckMain Gear CONTENTSCAUTION .PREPARATION OF SERVICING .IMPORTANT SERVICE SAFETY INFORMATION .IMPORTANT SAFEGUARDS.WHEN REPLACING DVD DECK .TAPE REMOVAL METHOD AT NO POWER SUPPLY .DISC REMOVAL METHOD AT NO POWER SUPPLY .PARENTAL CONTROL-RATION LEVEL .CONTENTS .GENERAL SPECIFICATIONS .DISASSEMBLY INSTRUCTIONS1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS.2. REMOVAL OF VCR DECK PARTS .3. REMOVAL OF DVD DECK PARTS .4. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC .KEY TO ABBREVIATIONS .SERVICE MODE LIST .PREVENTIVE CHECKS AND SERVICE INTERVALS.WHEN REPLACING EEPROM (MEMORY) IC .SERVICING FIXTURES AND TOOLS .PREPARATION FOR SERVICING.MECHANICAL ADJUSTMENTS .ELECTRICAL ADJUSTMENTS.BLOCK DIAGRAMSDVD.Y/C/AUDIO/CCD/HEAD AMP .SYSTEM CONTROL .OPERATION/DISPLAY .Hi-Fi/DEMODULATOR .TUNER/JACK .POWER .PRINTED CIRCUIT BOARDSDVD.VCR/OPERATION .LOADING MOTOR/SW .SCHEMATIC DIAGRAMSMPEG/MICON/DSP.MEMORY .RF AMP/DSP .AUDIO/VIDEO .Y/C/AUDIO/CCD/HEAD AMP .SYSCON .TUNER/JACK .OPERATION/DISPLAY .Hi-Fi/DEMODULATOR .POWER .OPERATION/LED.LOADING MOTOR/SW .INTERCONNECTION DIAGRAM .WAVEFORMS .MECHANICAL EXPLODED VIEW .CHASSIS EXPLODED VIEWS .DVD DECK EXPLODED VIEW.MECHANICAL REPLACEMENT PARTS LIST .CHASSIS REPLACEMENT PARTS LIST.DVD DECK REPLACEMENT PARTS LIST .ELECTRICAL REPLACEMENT PARTS LIST.A1-1A1-1A1-2A1-3A1-5A1-6A1-7A1-7A1-7A2-1A3-1A3-7B1-1, B1-2B2-1B2-6B3-1B3-3B4-1, B4-2C1-1, C1-2C2-1C3-1, C3-2C4-1D1-1D1-1D2-1D2-4D3-1, D3-2E-1, E-2E-3, E-4E-5, E-6E-7, E-8E-9, E-10E-11, E-12E-13, E-14F-1, F-2F-3F-6F-7, F-8G-1, G-2G-3, G-4G-5, G-6G-7, G-8G-9, G-10G-11, G-12G-13, G-14G-15, G-16G-17, G-18G-19, G-20G-21, G-22G-23, G-24G-25, G-26H-1H-3I1-1I2-1, I2-2I3-1J1-1J2-1J3-1J4-1, J4-2A2-1GENERAL SPECIFICATIONSG-1Outline of the productDVD VIDEO PLAYER & VHS Player / RecorderG-2DVD SystemColor SystemNTSCDiscDVD, CD-DA, CD-R/RWDisc Diameter120 mm , 80 mmDeckDisc Loading SystemFro