JVC-THM42-ddts-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0672003/11DVD DIGITAL THEATER SYSTEMMB067200310TH-M42TABLE 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-THM42SP-PWM45SP-THM45CSP-THM45FSP-THM45F SP-THM45SSP-THM45SRadioFans.CN 收音机爱 好者资料库1-2 (No.MB067)SPECIFICATIONCenter unit (XV-THM42)Audio sectionTotal Harmonic Distortion0.02%NOTE: This value is measured at System cord CONNECTOR for reference.Audio input sensiti

5、vity/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 kHz, 48 kHz)Video sectionColor SystemNTSCHorizontal Re

6、solution500 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-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V(p-p)/75 T

7、uner 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 inches)Mass4.6 kg (10.2 lbs)Subwoofer (SP-PWM45)Amplifier

8、 sectionFront/Center/Surround80 W per channel, RMS at 6 (Center/Surround)/80 W per channel, RMS at 4 (Front) 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, Magneticall

9、y ShieldedFrequency Range30 Hz to 200 HzGeneralPower RequirementsAC 120 V, 60 HzPower Consumption140 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 SpeakersFront speakers (SP-THM45F)Speakers8.

10、0 cm (3-3/16 inches), Bass-reflex, Magnetically ShieldedPower Handling Capacity120 WImpedance4 Frequency Range90 Hz to 20 kHzDimensions (W H D)103 mm 115 mm 100 mm (4-1/16 inches 4-9/16 inches 3-15/16 inches)Mass0.64 kg (1.5 lbs)Surround speakers (SP-THM45S)Speakers8.0 cm (3-3/16 inches), Bass-refle

11、x, Magnetically ShieldedPower Handling Capacity80 WImpedance6 Frequency Range90 Hz to 20 kHzDimensions (W H D)103 mm 115 mm 100 mm (4-1/16 inches 4-9/16 inches 3-15/16 inches)Mass0.52 kg (1.2 lbs)Center Speaker (SP-THM45C)Speakers8.0 cm (3-3/16 inches), Bass-reflex, Magnetically ShieldedPower Handli

12、ng Capacity80 WImpedance6 Frequency Range90 Hz to 20 kHzDimensions (W H D)103 mm 115 mm 100 mm (4-1/16 inches 4-9/16 inches 3-15/16 inches)Mass0.64 kg (1.5 lbs)AccessoriesRemote control (1), Batteries (2), FM antenna (1), AM loop antenna (1), Power cord (1), System cord (1), Composite video cord (1)

13、 Speaker codes5 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.MB067)1-3SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this pr

14、oduct 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 circuits. Servic

15、es 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 themanufacture of

16、 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 necessarily be obt

17、ained 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 and by ( ) onthe

18、 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 dressed with t

19、ies,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 confirmedthat they

20、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 be sure the p

21、roductis 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 any exposed m

22、etal 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 manner. Connect a

23、 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 returnpath to

24、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 tomeet interna

25、tional 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) If mains volta

26、ge 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 appearing on

27、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 specified by the

28、 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.MB067)1.5Preventing static electricity1.5.1Grounding to prevent damage by static elect

29、ricityElectrostatic 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 the earth processing for the destruction prevention

30、 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 workbench by laying conductive material (such as

31、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 to maintain quality during transport and before i

32、nstallation, 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 in the optical pickup. The testers internal power

33、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 wire after replacing the optical pickup. For specif

34、ic 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 when subjected to strong force.(4) It is not possi

35、ble 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 flexible wire is disconnected from the connector o

36、n 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.Conductive material (conductive sheet) or iron plate(cap

37、tion)Anti-static wrist strapDVD pickupDVD changer mechanism assemblyShort circuit points(No.MB067)1-51.6Important 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 servicea

38、ble 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 radiation when the drawer is open and the safety inter

39、locks 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 specified herein may result in hazardous radiation exposu

40、re.!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.1-6 (No.MB067)1.7Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with same type 1.6A/125V forF901, 6.3A/125V for F101, 8A/

41、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 fusibles suretes qui functionnes rapide.Power supply

42、 board (Forward side) F901 F101Speaker terminal board (Forward side) F153 F154Mother board (Forward side)(No.MB067)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB067)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the meta

43、l 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.)(3) Lift the rear section of the metal cover in t

44、he 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 joints a using a longer screwdriver.Fig.1Fig.2Fig.3Fi

45、g.4Metal coverAMetal coverAMetal coverRear panelBMetal coverClaws aClaws a(No.MB067)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 connectors (CN408, CN409) on the mainboard. (See Fig.5

46、.)(2) Disconnect the card wire from the connector CN407 on themain board. (See Fig.5.)(3) From the bottom side of the main body, remove the threescrews C attaching the front panel assembly. (See Fig.6.)(4) Release the two hooks b and hook c from the both and bot-tom sides of the main body, and remov

47、e the front panel as-sembly in the direction of the arrow. (See Figs.5 and 6.)Fig.5Fig.6CN407CN409CN408Hook bHook bMain boardParallel wiresFront panel assemblyCard wireHook cFront panelassemblyC1-10 (No.MB067)3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Remove the metal cover. Remove

48、 the front panel assembly.(1) From the top side of the main body, disconnect the cardwires from the connectors (CN405, CN415) on the mainboard.(2) Remove the four screws D attaching the DVD changermechanism assembly to the bottom chassis.(3) Take out the DVD changer mechanism assembly in an up-ward

49、direction.Note:When attaching the screw D, fit the hole of the DVD changermechanism assembly to the bosses d on the bottom chassis.Fig.73.1.4Removing the rear panel (See Fig.8) Remove the metal cover.(1) From the back side of the main body, remove the screw E,nine screws F and three screws G attachi

50、ng the rear panel.Fig.8Main boardBoss dBoss dCN405CN415Bottom chassisDVD changer mechanismassemblyCard wiresDDDEFFGGGRear panel(No.MB067)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 t