JVC-THM508-ddts-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2942004/7DVD DIGITAL CINEMA SYSTEMMB29420047TH-M508TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42SPECI

2、FIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJUST

3、MENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-345TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-

4、36Area suffixUS - SingaporeUW - Brazil,Mexico,PeruUX - Saudi ArabiaUG - Turkey,South Africa,EgyptUN - Asean(SP-THM508C) (SP-THM508F)(SP-THM505S) (SP-PWM508)(XV-THM508)RadioFans.CN 收音机爱 好者资料库1-2 (No.MB294)SPECIFICATIONCenter unit (XV-THM508)*1 : This value is measured at System cord CONNECTOR for ref

5、erence.*2 : Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)*3 : For PAL systemSubwoofer (SP-PWM508)Satellite Speakers-Front speakers (SP-THM508F)Audio section Digital input*2DIGITAL IN (DBS) (OPTICAL) -21 dBm to -15 dBm (660 n

6、m E30 nm)Video section Video SystemNTSC/PAL selectableHorizontal Resolution500 linesSignal-to-Noise Ratio64 dBVideo output levelComposite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V (0.3 V*3) (p-p)/75 Component-Y1.0 V(p-p)/75 Component-PB/PR0.7 V(p-p)/75 Video input sensitivity/Impedance (V

7、CR IN)Composite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V (0.3 V*3) (p-p)/75 Tuner section Tuning RangeFM87.50 MHz to 108.00 MHzAM531 kHz to 1 602 kHz (at 9 kHz intervals)530 kHz to 1 600 kHz (at 10 kHz intervals)GeneralPower RequirementsAC 110 - 240 V , 50/60 Hz (except for Australia)AC

8、240 V , 50 Hz (for Australia only)Power Consumption18 W (at operation) 2.0 W (in standby mode)Dimensions (W H D)400 mm 85 mm 380 mmMass4.3 kgAmplifier section Front/Center/Surround140 W per channel, RMS at 4 (Center/Surround)/ 140 W per channel, RMS at 4 (Front) at 1 kHz, with 10 % total harmonic di

9、stortion.Subwoofer300 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker section Speaker unit25 cm Bass-reflex, Magnetically ShieldedFrequency Range20 Hz to 200 HzGeneralPower RequirementsAC 110 V/127 V/220 - 240 V selectable with the voltage selector, 50 Hz/60 HzPower Consumption170

10、 W (at operation) 0 W (in standby mode)Dimensions (W H D) 256 mm 482 mm 460 mmMass18.5 kgSpeakersWoofer10.0 cm 2Tweeter4.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range60 Hz to 20 kHzDimensions (W H D)250 mm 1065.5 mm 310 mmMass7.2 kgRadioFans.CN 收音机爱 好

11、者资料库(No.MB294)1-3Satellite Speakers-Surround speakers (SP-THM505S)Satellite Speakers-Center speaker (SP-THM508C)Designs & specifications are subject to change without notice.Speakers8.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range80 Hz to 20 kHzDimensi

12、ons (W H D)111.5 mm 139 mm 106.5 mmMass0.52 kgSpeakersWoofer8.0 cm 2Tweeter4.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range65 Hz to 20 kHzDimensions (W H D)326 mm 119 mm 170 mmMass2.5 kg1-4 (No.MB294)SECTION 1PRECAUTION1.1Safety Precautions(1) This des

13、ign of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the original ci

14、rcuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further relieve the

15、manufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can theprotection afforded by them nece

16、ssarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the schematics an

17、d by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are routed and

18、dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it should be confi

19、rmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to

20、 be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly

21、 any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the following man

22、ner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metalpart, particularly any exposed metal part having a

23、returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment has been designed and manufactured

24、tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components are replacedby approved parts.(5)

25、If mains voltage selector is provided, check setting for localvoltage.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4Critical parts for safetyIn regard with component parts

26、 appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the mark nearby are criticalfor safety. When replacing them, be sure to use the parts of thesame type and rating as sp

27、ecified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE(No.MB294)1-51.5Preventing static electricityElectrostatic discharge (ESD), whic

28、h 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.1.5.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy

29、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 thetra

30、verse 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 optical

31、pickup 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 testers internal power source can easilydestroy the laser diode. 1.6Handling the traverse unit (o

32、ptical 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. Re

33、move 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 lase

34、r power. Do not turn it.1.7Attention 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 withou

35、t 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 strapTraverse mechanism assemblyConnectorS

36、hort land sectionsFlexible wirePickup1-6 (No.MB294)1.8Important 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

37、 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 danger

38、ous 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 :

39、 Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja

40、 nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operatio

41、ncheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai

42、 viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL(No.MB294)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis

43、 service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB294)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing 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 o

44、f 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

45、)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 aClaws a(No.MB294)1-93.1.2Removing the front panel assembly (See Figs.5 and 6) Prior to performing the followin

46、g 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

47、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 fro

48、nt 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 cJoint bJoint bFront panel assembly1-10 (No.MB294)3.1.3Removing the DVD changer mechanism assembl

49、y (See Fig.7) Prior to performing the following procedures, remove metalcover and front panel assembly.(1) From the top side of the main body, remove the screw E at-taching the wire protection board to the main board.(2) Take out the wire protection board, and disconnect thecard wires from the conne

50、ctors (CN401 to CN403) on themain board.Reference:When attaching the wire protection board, attach thewire protection board after connecting the card wires tothe connectors (CN401 to CN403) on the main board.(3) Remove the four screws F attaching the DVD changermechanism assembly on the bottom chass