JVC-THA9-ddcs-sm 维修电路原理图.pdf

SERVICE MANUALDVD DIGITAL THEATER SYSTEMNo.20926Mar. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.Printed in Japan200103(S)TH-A9 No.20926Safety precautionsImportant for laser productsPreventing static electricityDismantling and assembling the treverse unitDisassembly methodDiscription of major ICs1-21-31-41-51-81-22 Areas suffix J - U.S.A. C - CanadaContentsRM-STHA9JDVD THEATER SYSTEMDVD MENUTUNINGUPDOWNREC/REWFFPAUSESTROBEMEMORYTV/VIDEOMUTINGF.SEARCHB.SEARCHPLAYCHANNELTV VOLVOLUMESTOPDVDAUDIOTV/CATV/DBSSTANDBY/ONVCRDECODESUBTITLETITLEAUDIOTIMEDIGESTZOOMVCRTVSLEEPSETTINGTV RETURN FM MODE100+AUDIO/TV/VCRCAT/DBSCONTROLSUBWOOFEREFFECTCENTERTESTREAR-RENTERPLAYMODETHEATER POSITIONDSPMODEREAR-LDISPLAYCHOICEANGLERETURNSOUNDFM/AMAUXSP-PWA9XV-THA9SP-XSA9SP-XSA9SP-XCA9VICTOR COMPANY OF JAPAN, LIMITEDAUDIO & COMMUNICATION BUSINESS DIVISIONPERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,maebashi-city,371-8543,JapanTH-A9TH-A9RadioFans.CN 收音机爱 好者资料库TH-A91-2Safety Precautions1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use 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 current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). Warning1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains voltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!CAUTIONBurrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.RadioFans.CN 收音机爱 好者资料库TH-A91-3Important for Laser Products1.CLASS a 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 compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation 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 specified herein may result in hazardous radiation exposure.!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.TH-A91-4Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.1. Grounding to prevent damage 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. 1.1.1. Ground the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.1.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup 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 source can easily destroy the laser diode. 1.2. 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 the replacement 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 cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn itConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapTH-A91-5ShortingShorting Dismantling and assembling the traverse unit1. Notice regarding replacement of optical pickupElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs to the optical pickup or connected devices. (Refer to the section regarding anti-static measures.)1.Do not touch the area around the laser diode and actuator.2.Do not check the laser diode using a tester, as the diode may easily be destroyed.3.It is recommended that you use a grounded soldering iron when shorting or removing the laser diode. Recommended soldering iron: HAKKO ESD-compatible product4.Solder the land on the optical pickups flexible cable.Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an ungrounded soldering iron. Note : After shorting the laser diode according to the procedure above, remove the solder according to the text explanation. TH-A91-6XV-THA9 C/J ONLYFull Fuse Replacement MarkingGraphic symbol mark (This symbol means fast blow type fuse.)should be read as follows ;FUSE CAUTIONFOR CONTINUED PROTECTION AGAINST RISKOF FIRE, REPLACE ONLY WITH SAME TYPEAND RATING OF FUSES ;F901 : 1.6 A / 125 VF901 : 1.6 A / 125 VXV-THA9 C/J SEULEMENTMarquage Pour Le Remplacement Complet De FusiblePRECAUTIONS SUR LES FUSIBLESPOUR UNE PROTECTION CONTINUE CONTRE DES RISQUES DINCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)doit etre interprete comme suit ;Note : Its means J for U.S.A. market model and C for canada market model. Importance Admistering point on the Safety (XV-THA9)TH-A91-7SP-PWA9 C/J ONLYFull Fuse Replacement MarkingGraphic symbol mark (This symbol means fast blow type fuse.)should be read as follows ;FUSE CAUTIONFOR CONTINUED PROTECTION AGAINST RISKOF FIRE, REPLACE ONLY WITH SAME TYPEAND RATING OF FUSES ;F401 : 4A / 125 VF504 : 8A / 125 VF505 : 8A / 125 VSP-PWA9 C/J SEULEMENTMarquage Pour Le Remplacement Complet De FusiblePRECAUTIONS SUR LES FUSIBLESPOUR UNE PROTECTION CONTINUE CONTRE DES RISQUES DINCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)doit etre interprete comme suit ;Note : Its means J for U.S.A. market model and C for canada market model. Importance Admistering point on the Safety (SP-PWA9)F401 : 4A / 125 VF504 : 8A / 125 VF505 : 8A / 125 VTH-A91-8Remove the four screws A that retain the DVD door from the top of the unit.1.Removing the DVD door (See Fig.1) Prior to performing the following procedure, remove the DVD door.Remove the four screws (B) that attach the left and right side covers of the unit, from the bottom panel.Remove the left and right side covers by moving each of them in the direction of the corresponding arrow.1.2.Removing the right and left side covers (See Fig.2)Disassembly methodFig.1Fig.2DVD doorAABBRight side coverLeft side coverBottom panelTH-A91-9Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door. (Note) The mechanism slide switch for pickup protection should be set to the SHORTED position.Remove the three screws (C) that retain the front panel assembly, from the bottom panel of the unit.Remove four screws (D) that retain the DVD mechanism base, from the top of the unit.Remove the three screws (E) from the rear panel of the unit that retain the DVD mechanism base.Remove the DVD mechanism together with the front panel assembly by lifting them upward from the main unit and moving them toward the front.Disconnect the card wire of the DVD mechanism from the connector CN101 on the DVD servo board.Disconnect the wire of the LED board from the connector CN812 on the analog input/output board.Removing the front panel assembly and the DVD mechanism base(See Figs.3 to 7)1.2.3.4.5.Remove the front panel assembly and the DVD mechanism together, just as they were assembled.CDDBottom panelFront panel assemblyDVD mechanism baseFront panel assemblyFront panel assemblyDVD mechanism baseEEERear panelDVD mechanism baseAnalog I/O board CN812Front panel assemblyDVD servo boardCN101DVD servo boardCN101DVD mechanism assemblyLED boardAnalog I/O boardCN812Fig.3Fig.4Fig.5Fig.6Fig.7TH-A91-10(Note)(Note)(Note)Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door.Remove the front panel assembly and the DVD mechanism base together from the main unit. (See Figs. 3 to 7.)On the back of the DVD mechanism base, disengage the four claws at the engaging points (a) that attach the front panel assembly to the DVD mechanism base, and then pull out the front panel assembly in the direction of the arrow to separate it from the DVD mechanism base. Separating the front panel assembly and the DVD mechanism base (See Fig.8)1.2.It is at this stage that the front panel assembly and the DVD mechanism base are separated from each other.Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door.Also separate the front panel assembly from the DVD mechanism base.Remove the five screws (F) that retain the display board.Removing the display board (See Fig.9)1.Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door. Remove the four screws (G) from the back of the DVD mechanism base that retain the DVD mechanism cover.Remove the DVD mechanism assembly from the DVD mechanism base.Removing the DVD mechanism assembly(See Figs.10 and 11)1.2.This work is possible even when the front panel assembly is attached to the DVD mechanism base.Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door. Remove two screws (H) that retain the LED board cover, from the back of the DVD mechanism base.Remove the LED board by pulling it away from the DVD mechanism base.Removing the LED board(See Figs.10 and 11)1.2.This work is possible even when the front panel assembly is attached to the DVD mechanism base.Fig.8Fig.9Fig.10Fig.11DVD mechanism baseEngaging points (a)Engaging points (a)Front panel assemblyDisplay boardFront panel assemblyFFLED board coverHHGGDVD mechanism coverDVD mechanism assemblyLED boardDVD mechanism assemblyTH-A91-11Prior to performing the following procedure, remove the left and right side covers.Also remove the DVD door.Also remove the front panel assembly and DVD mechanism base.Disconnect the card wires from the connectors CN401 and CN402 on the analog board.Remove the screw (I) that retains the analog board bracket from the top of the unit.Remove the screw (J) and the screw (K) that retain the analog board from the rear panel of the unit.Disengage the analog board bracket and the gear motor assembly by moving the engaged part (b) upward. Then move the analog board in the direc