Jvc-THM-303-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB2312004/5DVD DIGITAL CINEMA SYSTEMMB23120045TH-M303TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-345 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36(SP-THM303C) (SP-THM303F) (SP-THM303S) (SP-PWM303)(XV-THM303)Area suffixB - U.K.E - Continental EuropeEN - Northern EuropeEV - Eastern EuropeEE - Russian Federation1-2 (No.MB231)SPECIFICATIONCenter unit (XV-THM)*1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)Subwoofer (SP-PWM303)Front speakers (SP-THM303F)Surround speakers (SP-THM303S)Center Speaker (SP-THM303C)Designs furthermore the manufacturer cannotaccept responsibility for personal injury or property damage resulting therefrom.(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must neverbe replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts inthe product have special safety related characteristics. These characteristics are often not evident from visual inspection. Partsother than specified by the manufacturer may not have the same safety characteristics as the recommended replacement partsshown in the Parts List of the Service Manual and may create shock, fire, or other hazards.(4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts,high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, after re-assembling.1.5.1 Warning(1) Service should be performed by qualified personnel only.(2) This equipment has been designed and manufactured to meet international safety standards.(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.(4) Repairs must be made in accordance with the relevant safety standards.(5) It is essential that safety critical components are replaced by approved parts.(6) If mains voltage selector is provided, check setting for local voltage.Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.(No.MB231)1-51.6 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laserdiode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.6.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing thetraverse unit (optical pickup) on it.(2) Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. (3) Handling the optical pickup In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement opticalpickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easilydestroy the laser diode. 1.7 Handling the traverse unit (optical pickup)(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to thereplacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long atime when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.8 Attention when traverse unit is decomposed*Please refer to “Disassembly method“ in the text for the pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexiblewire is disconnected without applying solder, the pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapShort circuit points211-6 (No.MB231)1.9 Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts inside theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The CD,MD and DVD player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able to function.6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)WARNING LABEL(No.MB231)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB231)SECTION 3DISASSEMBLY3.1 Main body section3.1.1 Removing the metal cover (See Figs.1 to 4)(1) From the both sides of the main body, remove the fourscrews A attaching the metal cover. (See Figs.1 and 2)(2) From the back side of the main body, remove the threescrews B attaching the metal cover. (See Fig.3)(3) Lift the rear section of the metal cover in the direction of thearrow while extending the lower sections of the metal cov-er, release the five claws a using a longer screwdriver fromthe inside as required. (See Fig.4)Note:Do not damage any parts and boards inside the main bodywhen releasing the claws a using a longer screwdriver. Fig.1Fig.2Fig.3Fig.4Metal coverAMetal coverAMetal coverBMetal coverClaws a Claws a(No.MB231)1-93.1.2 Removing the front panel assembly (See Figs.5 and 6) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the parallelwires from the connectors (CN456, CN457) on the mainboard. (See Fig.5)(2) Disconnect the card wires from the connectors (CN450,CN460) on the main board. (See Fig.5)(3) Remove the screw C attaching the earth wire to the mainboard. (See Fig.5)Reference:When attaching the screw C, attach the earth wire withit. (See Fig.5)(4) From the bottom side of the main body, remove the threescrews D attaching the front panel assembly. (See Fig.6)(5) From the both and bottom sides of the main body, removethe front panel assembly in the direction of the arrow whilereleasing the joints b and c. (See Fig.6)Fig.5Fig.6CN460Main boardCCard wireEarthwireFront panel assemblyCN457Parallel wiresCN450CN456Card wireDJoint c Joint bJoint bFront panel assembly1-10 (No.MB231)3.1.3 Removing the DVD changer mechanism assembly (See Fig.7) Prior to performing the following procedures, remove metalcover and front panel assembly.(1) From the top side of the main body, disconnect the cardwires from the connectors (CN401 to CN403) on the mainboard.Reference:When connecting the card wires, connect them to theconnectors (CN401 to CN403) on the main board afterpassing the card wires through the hole d on the mainboard.(2) Remove the four screws E attaching the DVD changermechanism assembly on the bottom chassis.(3) Take out the DVD changer mechanism assembly in the up-ward direction.Reference:When attaching the DVD changer mechanism assembly, alignthe holes of the DVD changer mechanism assembly to the pro-jections e on the bottom chassis.Fig.73.1.4 Removing the rear panel (See Fig.8) Prior to performing the following procedures, remove the metalcover.(1) From the back side of the main body, remove the screw Fand thirteen screws G attaching the rear panel.Fig.8Main boardCN402Bottom chassisDVD changer mechanism assemblyCard wiresEEEProjections eHole dCN401 CN403GFRear panelG