JVC-THM303-ddts-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1842004/3DVD DIGITAL THEATER SYSTEMMB18420043TH-M303, TH-M301TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-315TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33 Area suffixJ - U.S.A.C - Canada Area suffixJ - U.S.A.TH-M303TH-M301RadioFans.CN 收音机爱 好者资料库1-2 (No.MB184)SPECIFICATIONCenter unit (XV-THM606/XV-THM603/XV-THM505/XV-THM501/ XV-THM303/XV-THM301)*1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)Subwoofer (SP-PWM603/SP-PWM303/SP-PWM301)*3: For SP-PWM301Front speakers (SP-THM303F)Surround speakers (SP-THM303S)Center Speaker (SP-THM303C)Designs & specifications are subject to change without notice.Audio sectionTotal Harmonic Distortion0.02%NOTEThis value is measured at System cord CONNECTOR for reference.Digital input *1DIGITAL IN (DBS) (OPTICAL):-21 dBm to -15 dBm (660 nm E30 nm)Video sectionVideo SystemNTSCHorizontal Resolution500 linesSignal-to-Noise Ratio64 dBVideo output levelComposite:1.0 V(p-p)/75S-video-Y:1.0 V(p-p)/75S-video-C:0.286 V(p-p)/75Component-Y:1.0 V(p-p)/75Component-PB/PR:0.7 V(p-p)/75Video input sensitivity/Impedance (VCR IN)Composite:1.0 V(p-p)/75S-video-Y:1.0 V(p-p)/75S-video-C:0.286 V(p-p)/75Tuner sectionTuning RangeFM:87.5 MHz to 108.0 MHzAM:530 kHz to 1 710 kHzPower RequirementsAC 120 V, 60 HzGeneralPower Consumption18 W (at operation) 2.0 W (in standby mode)Dimensions (W H D)400 mm 85 mm 380 mm (15-3/4 inches 3-3/8 inches 15 inches)Mass4.3 kg (9.5 lbs)Amplifier section Front/Center/Surround115 W (100 W *3) per channel, RMS at 4 (Center/Surround)/ 125 W (115 W *3) per channel,RMS at 4 (Front) at 1 kHz, with 10 % total harmonic distortion.Subwoofer125 W (120 W *3), RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker section Speaker unit16 cm (6-5/16 inches) Bass-reflex, Magnetically ShieldedFrequency Range30 Hz to 200 HzGeneralPower RequirementsAC 120 V, 60 HzPower Consumption125 W (at operation) 0 W (in standby mode)Dimensions (W H D)168.5 mm 412 mm 444 mm (6-11/16 inches 16-1/4 inches 17-1/2 inches)Mass12.0 kg (26.5 lbs)Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4Frequency Range90 Hz to 20 kHzDimensions (W H D)106 mm 119.5 mm 102 mm (4-3/16 inches 4-3/4 inches 4-1/16 inches)Mass0.69 kg (1.6 lbs)Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4Frequency Range80 Hz to 20 kHzDimensions (W H D)111.5 mm 139 mm 106.5 mm (4-7/16 inches 5-1/2 inches 4-1/4 inches)Mass0.63 kg (1.4 lbs)Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically ShieldedPower Handling Capacity140 WImpedance4Frequency Range90 Hz to 20 kHzDimensions (W H D)106 mm 119.5 mm 102 mm (4-3/16 inches 4-3/4 inches 4-1/16 inches)Mass0.69 kg (1.6 lbs)RadioFans.CN 收音机爱 好者资料库(No.MB184)1-3SECTION 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 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. Any 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 characteris-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-vice 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 Service 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 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 product (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 Current 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 into 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 the resistor connection to each expo sed 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 corresponds 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 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 of pre-forming repair of this system.1.4Critical parts for safetyIn regard with compon ent 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 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 10W0.15 F AC TYPE1-4 (No.MB184)1.5Preventing 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 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 testers 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 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.1.7Attention 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 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 points(No.MB184)1-51.8Importance administering point on the safetyCaution: For continued protection against risk of fire,replace only with same type 1.6A/125V for F901,6.3A/125V for F101, 8A/125V for F153 and F154.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/125 pour F101, et 8A/125Vpour F153 et F154.Ce sont des fusibles suretes qui functionnes rapide.1.6A-125VF9016.3A-125VF1018A-125VF1548A-125VF153 RY101 CN101 CN102 XV-THM303/XV-THM301SP-PWM303/SP-PWM3011-6 (No.MB184)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB184)1-7SECTION 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 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 aClaws a1-8 (No.MB184)3.1.2Removing 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 con nectors (CN456, CN457) on the mainboard. (See Fig.5)(2) Disconnect the card wires from the con nectors (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 cJoint bJoint bFront panel assembly(No.MB184)1-93.1.3Removing 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, 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.73.1.4Removing 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 twelve screws G attaching the rear panel.Fig.8Main boardCN402Bottom chassisDVD changer mechanism assemblyCard wiresEEEProjections eHole dCN401CN403FGGRear panel1-10 (No.MB184)3.1.5Removing the audio & digital input board (See Figs.9 and 10) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the cardwires from the con nectors (CN411, CN412) on the mainboard. (See Fig.9)(2) Remove the screw H attaching the audio & digital inputboard to the bracket(DSP). (See Fig.9)(3) From the back side of the main body, remove the screw Jand two screws K attaching the audio & digital input boardto the rear panel. (See Fig.10)(4) Take out the audio & digital input board from the mainbody.3.1.6Removing the tuner (See Figs.9 and 10) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the cardwire from the connector CN1 on the tuner. (See Fig.9)(2) From the back side of the main body, remove the twoscrews L attaching the tuner to the rear panel. (See Fig.10)(3) Take out the tuner from the main body.3.1.7Removing the power supply board (S