Jvc-THS-77-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2005 Victor Company of Japan, LimitedNo.MB4212005/7DVD DIGITAL CINEMA SYSTEMMB42120057TH-S77Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-205 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25PHONESMIC 2MIC 1MINMIC LEVELMAXArea suffixUS - SingaporeUP - KoreaUT - TaiwanUX - Saudi ArabiaUG - Turkey,South Africa,EgyptUN - Asean(SP-THS77F) (SP-THS77F) (SP-THS77S)(SP-PWS77)(XV-THS77)(SP-THS77C)1-2 (No.MB421)SPECIFICATIONCenter unit (XV-THS77)*1: This value is measured at System cord 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-PWS77)Audio section Total Harmonic Distortion *1 0.02%Audio input level AUDIO IN (VCR) 270 mV/47 kDigital input *2 DIGITAL IN (OPTICAL) -21 dBm to -15 dBm (660 nm E30 nm)Video section Video System PAL/NTSCHorizontal Resolution 500 linesSignal-to-Noise Ratio 64 dBVideo input sensitivity/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 Video output level 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 Component-Y: 1.0 V(p-p)/75 Component-PB/PR: 0.7 V(p-p)/75 Tuner section Tuning Range FM 87.50 MHz to 108.00 MHzAM (Except for the countries of Middle East) 531 kHz to 1 710 kHz(at 9 kHz intervals)530 kHz to 1 710 kHz(at 10 kHz intervals)AM (For the countries of Middle East) 531 kHz to 1 602 kHz(at 9 kHz intervals)530 kHz to 1 600 kHz(at 10 kHz intervals)General Power Requirements AC 110 - 240 V , 50/60 HzPower Consumption 17 W (at operation)1.4 W (in standby mode)Dimensions (W × H ×D) 435 mm × 55 mm ×304 mmMass 2.5 kgAmplifier section Front 140 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Center/Surround 130 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion.Subwoofer 140 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker section Speaker unit 16 cm Bass-reflexPower Handling Capacity 140 WImpedance 4 Frequency Range 30 Hz to 200 HzGeneral Power Requirements AC 110 V/AC 127 V/AC 220 - 240 V, 50 Hz/60 HzPower Consumption 135 W (at operation)0 W (in standby mode)Dimensions (W × H × D) 170 mm × 411 mm × 451 mmMass 11.5 kg(No.MB421)1-3Satellite SpeakersDesigns & specifications are subject to change without notice.Front speakers(SP-THS77F)Speaker unit 5.5 cm × 21-way 2-speaker bass-reflex type, Magnetically ShieldedPower Handling Capacity 140 WImpedance 4 Frequency Range 90 Hz to 20 kHzSound Pressure Level 78 dB/W·mDimensions (W × H × D) 230 mm × 1 104 mm × 285 mmMass 3.6 kgCenter speaker (SP-THS77C)Speaker unit 5.5 cm × 21-way 2-speaker bass-reflex type, Magnetically ShieldedPower Handling Capacity 140 WImpedance 4 Frequency Range 90 Hz to 20 kHzSound Pressure Level 80 dB/W·mDimensions (W × H × D) 220 mm × 84 mm × 91 mmMass 0.96 kgSurround speakers(SP-THS77S)Speaker unit 5.5 cm × 21-way 2-speaker bass-reflex typePower Handling Capacity 140 WImpedance 4 Frequency Range 90 Hz to 20 kHzSound Pressure Level 75.5 dB/W·mDimensions (W × H × D) 230 mm × 1 104 mm × 285 mmMass 3.5 kg1-4 (No.MB421)SECTION 1PRECAUTION1.1 Safety 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 a“Leakage 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 0.15µF 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 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.). 1.2 Warning(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.1.3 CautionBurrs 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.1.4 Critical 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 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 TYPE(No.MB421)1-51.5 Preventing 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 tester's internal power source can easilydestroy the laser diode. 1.6 Handling 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.1.7 Attention 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 land sectionCard wireTraverse mechanism assemblypickup1-6 (No.MB421)1.8 Important 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 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 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 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 laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)!Please 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 laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)WARNING LABEL(No.MB421)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB421)SECTION 3DISASSEMBLY3.1 Main body section3.1.1 Removing the metal cover (See Figs.1 to 3)(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 fivescrews B attaching the metal cover. (See Fig.3)(3) Lift the rear section of the metal cover upward while ex-tending the lower sections of the metal cover. (See Fig.3)Fig.1Fig.2Fig.3AMetal coverAMetal coverMetal coverB(No.MB421)1-93.1.2 Removing the front panel assembly (See Figs.4 to 7) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the parallelwires from the connector CN420 on the main board. (SeeFig.4)(2) Disconnect the parallel wires from the connectors CN451,CN452 and CN460 on the main board. (See Fig.4)(3) Remove the screw C attaching the earth wire to the mainboard. (See Fig.4)(4) Remove the earth wire attaching to the chassis base. (SeeFig.4)Reference:When attaching the screw C, attach the earth wire withit. (See Fig.4)(5) From the bottom side of the main body, remove the threescrews D attaching the front panel assembly. (See Fig.5)(6) Remove the front panel assembly in the direction of the ar-row while releasing the two joints a and two joints b. (SeeFig.5 to 7)Fig.4Fig.5Fig.6Fig.7CCN452CN460Earth wire Front panel assemblyCN451CN420Main boardDFront panel assemblyJoint aFront panel assemblyJoint bFront panel assemblyJoint b1-10 (N