JVC-THM55-ddts-sch 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0752003/11DVD DIGITAL THEATER SYSTEMMB075200310TH-M55TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPE

2、CIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJU

3、STMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-345TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、1-39 Area suffixJ - U.S.A.C - CanadaXV-THM55SP-PWM55SP-THM55CSP-THM55F SP-THM55F SP-THM55F SP-THM55FRadioFans.CN 收音机爱 好者资料库1-2 (No.MB075)SPECIFICATIONDesign and specifications are subject to change without notice.Center unitAudio sectionTotal Harmonic Distortion0.02%NOTE : This value is measured at

5、System cord CONNECTOR for reference.Audio input sensitivity/Impedance (at 1 kHz)Analog inputAUDIO IN (VCR)290 mV/47 kDigital input*DIGITAL IN (DBS) (OPTICAL)-21 dBm to -15 dBm (660 nm 30 nm)* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1

6、 kHz, 48 kHz)Video sectionColor SystemNTSCHorizontal 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(p-p)/75 Component-Y1.0 V(p-p)/75 Component-PB/PR0.7 V(p-p)/75 Video input sensitivity/Impedance (VCR IN)Composite1.0 V(p-

7、p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V(p-p)/75 Tuner sectionTuning RangeFM87.5 MHz to 108.0 MHzAM530 kHz to 1710 kHzGeneralPower RequirementsAC 120 V, 60 HzPower Consumption20 W (at operation), 1.0 W (in standby mode)Dimensions (W H D)400 mm 85 mm 386 mm (15-3/4 inches 3-3/8 inches 15-1/14 in

8、ches)Mass4.6 kg (10.2 lbs)SubwooferAmplifier sectionFront/Center/Surround100 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Subwoofer120 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker sectionSpeaker unit16 cm (6-5/16 inches) Bass-reflex, Magnetically Shield

9、edFrequency Range30 Hz to 200 HzGeneralPower RequirementsAC 120 V, 60 HzPower Consumption150 W (at operation), 0 W (in standby mode)Dimensions (W H D)216 mm 353 mm 485 mm (8-9/16 inches 13-15/16 inches 19-1/8 inches)Mass12.0 kg (26.5 lbs)Satellite SpeakerSpeakersWoofer10.0 cm (3-15/16 inches)Tweeter

10、4.0 cm (1-5/8 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity100 WImpedance4 Frequency Range65 Hz to 20 kHzDimensions (W H D)140 mm 228 mm 167 mm (5-9/16 inches 9 inches 6-5/8 inches)Mass1.9 kg (4.2 lbs)Center SpeakerSpeakersWoofer8.0 cm (3-3/16 inches) 2Tweeter4.0 cm (1-5/8 inches

11、) Bass-reflex, Magnetically ShieldedPower Handling Capacity100 WImpedance4 Frequency Range65 Hz to 20 kHzDimensions (W H D)326 mm 119 mm 164 mm (12-7/8 inches 4-11/16 inches 6-1/2 inches)Mass2.4 kg (5.3 lbs)AccessoriesRemote control (1), Batteries (2), FM antenna (1), AM loop antenna (1), Power cord

12、 (1), System cord (1), Composite video cord (1)Speaker codes (1)5 m (16 ft)For satellite (front left/right) and center speakers (3)10 m (32 ft)For satellite speakers (surround left/right) (2) (The length of the above speaker cords are approximate.)RadioFans.CN 收音机爱 好者资料库(No.MB075)1-3SECTION 1PRECAUT

13、ION1.1Safety 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 in writing by themanufacturer. Replacement parts must be ident

14、ical 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. Any design alterations or additions will voidthe manufacturers w

15、arranty 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 characteris-tics are often not evident from visual inspection nor can

16、 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-vice Manual. Electrical components having such featuresare identi

17、fied 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 Service Manual may create shock, fire, orother hazards.(4) The l

18、eads 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 service is required, the original lead routingand dress should

19、 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 product (an-tenna terminals, knobs, metal cabinet, screw heads,head

20、phone 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 Current Tester, measure the leakage currentfrom each exposed metal

21、 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 into the AC outlet. Use anAC voltmeter having, 1,000 per volt or

22、more sensitivityin the following manner. 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, particula

23、rly 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 corresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment

24、 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 standards.(4) It is essential that safety critical component

25、s 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 of pre-forming repair of this system.1.4Critical parts for

26、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 criticalfor safety. When replacing them, be sure to use the pa

27、rts 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 10W0.15 F AC TYPE1-4 (No.MB075)1.5Preventing static electrici

28、ty1.5.1Grounding to prevent damage by 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.1.5.2About t

29、he earth processing for the destruction prevention by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbenchGround the

30、 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.1.5.3Handling the optical pickup(1) In order

31、 to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pick-up are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)(2) Do not use a tester to check the condition of the laser diode

32、in the optical pickup. The testers internal power source can easilydestroy the laser diode.1.5.4Handling 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) Remove solder of the short lands on the flexible w

33、ire after replacing the optical pickup. For specific details, refer to the replace-ment procedure in the text. Remove the anti-static pin when replacing the traverse unit.Be careful not to take too long a time when attaching it to the connector.(3) Handle the flexible wire carefully as it may break

34、when subjected to strong force.(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.5.5Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the DVD pickup. Apply solder to the short circuit points before the

35、flexible wire is disconnected from the connector on the DVD pickup. (If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short circuit points after connecting the flexible wire.Conduc

36、tive material (conductive sheet) or iron plate(caption)Anti-static wrist strapDVD pickupDVD changer mechanism assemblyShort circuit points(No.MB075)1-51.6Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct

37、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 compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radi

38、ation when the drawer is open and the safety interlocks have failed or are de feated. 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 herein may result in hazardous radiation exposure.!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.1-6 (No.MB075)1.7Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with sa

40、me type 1.6A/125V forF901, 6.3A/125V for F101, 8A/125V for F153 andF154.This symbol specifies type of fast operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F901 comme le meme typeque 1.6A/125V, et 6.3A/125V pour F101, et 8A/125Vpour F153 et F154.Ce sont des fu

41、sibles suretes qui functionnes rapide.Power supply board (Forward side) F901 F101Speaker terminal board (Forward side) F153 F154Mother board (Forward side)(No.MB075)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB075)SECTION 3DIS

42、ASSEMBLY3.1Main body section3.1.1Removing the metal cover (See Figs.1 to 4)(1) From the right and left sides of the main body, remove thefour screws A attaching the metal cover. (See Figs.1 and2.)(2) From the back side of the main body, remove the threescrews B attaching the metal cover. (See Fig.3.

43、)(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 claws a using a longer screwdriver from theinside as required. (See Fig.4.)Note:Do not damage any parts and boards inside the main bodywhen releasing the joi

44、nts a using a longer screwdriver.Fig.1Fig.2Fig.3Fig.4Metal coverAMetal coverAMetal coverRear panelBMetal coverClaws aClaws a(No.MB075)1-93.1.2Removing the front panel assembly (See Figs.5 and 6) Remove the metal cover.(1) From the top side of the main body, disconnect the parallelwires from the conn

45、ectors (CN408, CN409) on the mainboard. (See Fig.5.)(2) Disconnect the card wires from the connectors (CN407,CN412) on the main board. (See Fig.5.)(3) Remove the screw C attaching the earth wire to the mainboard. (See Fig.5.)(4) From the bottom side of the main body, remove the threescrews D attachi

46、ng the front panel assembly. (See Fig.6.)(5) Release the two hooks b and hook c from the both and bot-tom sides of the main body, and remove the front panel as-sembly in the direction of the arrow. (See Figs.5 and 6.)Fig.5Fig.6CN407CN412CN409CN408Hook bHook bMain boardCCard wireEarthwireParallel wir

47、esFront panel assemblyCard wireHook cFront panelassemblyD1-10 (No.MB075)3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Remove the metal cover. Remove the front panel assembly.(1) From the top side of the main body, disconnect the cardwires from the connectors (CN405, CN415) on the main

48、board.(2) Remove the four screws E attaching the DVD changermechanism assembly to the bottom chassis.(3) Take out the DVD changer mechanism assembly in an up-ward direction.Note:When attaching the screw E, fit the hole of the DVD changermechanism assembly to the bosses d on the bottom chassis.Fig.73

49、.1.4Removing the rear panel (See Fig.8) Remove the metal cover.(1) From the back side of the main body, remove the screw F,nine screws G and three screws H attaching the rear panel.Fig.8Main boardBoss dBoss dCN405CN415Bottom chassisDVD changer mechanismassemblyCard wiresEEEFGGHHHRear panel(No.MB075)

50、1-113.1.5Removing the audio & digital input board (See Figs.9 and 10) Remove the metal cover.(1) From the top side of the main body, disconnect the cardwire from the connector CN401 on the audio & digital inputboard. (See Fig.9.)(2) Remove the screw J attaching the audio & digital inputboard. (See F