JVC-THC3-ddcs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4202005/7DVD DIGITAL CINEMA SYSTEMMB42020057TH-C3Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-305TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35XV-THC3SP-THC3FSP-PWC3SP-THC3SSP-THC3CArea suffixUW - Brazil,Mexico,PeruUY - ArgentinaUJ - U.S.MilitaryRadioFans.CN 收音机爱 好者资料库1-2 (No.MB420)SPECIFICATIONCenter unit (XV-THC3)*1: This value is measured at System c

5、ord CONNECTOR for reference.*2: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz)Subwoofer (SP-PWC3)Audio sectionTotal Harmonic Distortion*10.02%Digital input*2DIGITAL IN (DBS): -21 dBm to -15 dBm(OPTICAL: 660 nm 30 nm)Video sect

6、ionVideo SystemPAL/NTSCHorizontal Resolution500 linesSignal-to-Noise Ratio64 dBVideo output levelComposite: 1.0 V(p-p)/75 S-video-Y: 1.0 V(p-p)/75 S-video-C: For PAL: 0.3 V(p-p)/75 S-video-C: For NTSC: 0.286 V(p-p)/75 Component-Y: 1.0 V(p-p)/75 Component-PB/PR: 0.7 V(p-p)/75 Video input sensitivity/

7、Impedance (VCR IN)Composite: 1.0 V(p-p)/75 S-video-Y: 1.0 V(p-p)/75 S-video-C: For PAL: 0.3 V(p-p)/75 S-video-C: For NTSC: 0.286 V(p-p)/75 Tuner sectionTuning RangeFM87.5 MHz to 108.0 MHzAM531 kHz to 1 710 kHz (at 9 kHz channel spacing)530 kHz to 1 710 kHz (at 10 kHz channel spacing)For Middle East5

8、31 kHz to 1 602 kHz (at 9 kHz channel spacing)530 kHz to 1 600 kHz (at 10 kHz channel spacing)GeneralPower RequirementsAC 110-240 V , 50/60 HzPower Consumption19 W (at operation)1.9 W (in standby mode)Dimensions (W H D)400 mm 85 mm 399 mmMass4.2 kg (9.3 lbs)Amplifier sectionFront140W per channel, RM

9、S at 4 at 1 kHz, with 10 % total harmonic distortion.Center/Surround130W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Subwoofer140 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker sectionSpeaker unit16 cm Bass-reflexPower Handling Capacity140 WImpedance4 Freq

10、uency Range30 Hz to 200 HzGeneralPower RequirementsAC 110 V/ AC 127 V/AC 220-240 V , 50/60 HzPower Consumption135 W (at operation)0 W (in standby mode)Dimensions (W H D)169 mm 411 mm 451 mmMass11.3 kgRadioFans.CN 收音机爱 好者资料库(No.MB420)1-3Satellite Speakers (SP-XTHC3)Designs & specifications are subjec

11、t to change without notice.Front speakers (SP-THC3F)Speaker unit8.0 cm1.5 cmBass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range80 Hz to 20 kHzDimensions (W H D)104.5 mm 139 mm 101 mmMass0.56 kg eachCenter speaker (SP-THC3C)Speaker unit8.0 cm1.5 cmBass-reflex, Mag

12、netically ShieldedPower Handling Capacity140 WImpedance4 Frequency Range80 Hz to 20 kHzDimensions (W H D)137 mm 105 mm 104.5 mmMass0.57 kg (1.3 lbs)Surround speakers (SP-THC3S)Speaker unit8.0 cmBass-reflexPower Handling Capacity140 WImpedance4 Frequency Range80 Hz to 20 kHzDimensions (W H D)111.5 mm

13、 148 mm 106.5 mmMass0.56 kg each1-4 (No.MB420)SECTION 1PRECAUTION1.1Safety Precautions(1) This design 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

14、in writing by themanufacturer. Replacement parts must be identical tothose used in the original circuits. 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. An

15、y design alterations or additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These charact

16、eris-tics are often not evident from visual inspection nor can theprotection afforded by them necessarily 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-vic

17、e Manual. Electrical components having such featuresare identified by shading on the schematics and 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 Se

18、rvice Manual may create shock, fire, orother hazards.(4) The leads in the products are routed and 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

19、service is required, the original lead routingand dress should be observed, and it should be confirmedthat 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 produ

20、ct (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to 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 Curr

21、ent Tester, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly 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 int

22、o the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between anexposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move

23、the resistor connection to each exposed metalpart, particularly any exposed metal part having a 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 co

24、rresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment has been designed and manufactured 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

25、standards.(4) It is essential that safety critical components are replacedby approved parts.(5) 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

26、 of pre-forming repair of this system.1.4Critical parts for safetyIn regard with component parts 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 cr

27、iticalfor safety. When replacing them, be sure to use the parts of thesame type and rating as specified 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 1

28、0W0.15 F AC TYPE(No.MB420)1-51.5Preventing 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.1.5.1 G

29、rounding 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

30、 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 du

31、ring 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 t

32、esters internal power source can easilydestroy the laser diode. 1.6Handling 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 repla

33、cing 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

34、to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.7Attention 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 i

35、s 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(condu

36、ctive sheet) or iron palate(caption)Anti-static wrist strapCard wireDVD pickupDVD changer mechanism assemblyConnectorShort land section1-6 (No.MB420)1.8Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct ex

37、posure 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 rad

38、iation 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 specifi

39、ed 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 laserstrlning nr den ppnas och sprren rurkopplad. Betrakt

40、a ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai 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)!Pleas

41、e 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 laserstrlning nr den

42、ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkt

43、e eksponering til strling. (d)WARNING LABEL(No.MB420)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB420)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the metal cover (See Figs. 1 to 4)(1) From the both sides of the main

44、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 m

45、etal cov-er, release the seven claws a using a longer screwdriverfrom the 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 aClaw

46、s a(No.MB420)1-93.1.2Removing 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 car

47、d wires from the connectors (CN450,CN460) on the main board. (See Fig. 5.)(3) Remove the screw C attaching the earth wires to the mainboard. (See Fig. 5.)Reference:When attaching the screw C, attach the earth wires withit. (See Fig. 5.)(4) From the bottom side of the main body, remove the threescrew

48、s 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.6CN456Main boardCCard wireCN460EarthwiresFront panel assemblyCN457Parallel w

49、iresCN450Card wireDJoint cJoint bJoint bFront panel assembly1-10 (No.MB420)3.1.3Removing 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, remove the screw E at-taching the

50、wire protection board to the main board.(2) Take out the wire protection board, and disconnect thecard wires from the connectors (CN401 to CN403) on themain board.Reference:When attaching the wire protection board, attach thewire protection board after connecting the card wires tothe connectors (CN4