JVC-THA10-ddts-sm 维修电路原理图.pdf

SERVICE MANUALNo.20890JAN. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.Printed in Japan200101(S) No.20890DVD DIGITAL THEATER SYSTEMTH-A10TH-A10TH-A10 (DVD player)/XV-TH-A10SP-THA10(Speaker section)SP-PWA10 (Powered subwoofer)SP-XCA10 (Center speaker)SP-XSA10 (Satellite speaker) x 4ContentsSafety precautionsPreventing static electricityDismantling and assembling the traverse unitDisassembly methodDisassembly methodMain adjustment Precautions for service Description of major ICs1-21-31-41-51-171-211-241-25Area SuffixTH-A103U4UMaiaysia, Thailand,PhilippinesBrazil, Mexico, PeruTH-A10SP-PWA10SP-XSA10SP-XSA10SP-XCA10XV-THA10VICTOR COMPANY OF JAPAN, LIMITEDAUDIO & COMMUNICATION BUSINESS DIVISIONPERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,JapanRadioFans.CN 收音机爱 好者资料库TH-A101-2Safety 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-A101-3Preventing 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-A101-4Dismantling 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. Short circuit landLaser pick-up unitFlexible cableShot with the rclipShortingTH-A101-5Remove the four screws A attaching the top cover (Use an Allen wrench).Lift up the front part of the top cover to release the two joints a and remove the top cover toward the front.1.2.Removing the top cover (See Fig.1 and 2)Prior to performing the following procedure, remove the top cover.Remove the four screws B attaching the rear cover on the back of the body. Pull out the rear cover backward.1.Removing the rear cover (See Fig. 3)Prior to performing the following procedure, remove the top cover and the rear cover.Move the left side cover backward to release the five joint hooks b and remove the left side cover outward.Remove the right side cover in the same way.1.2.Removing the right and left side covers (See Fig. 4 and 5)Disassembly methodFig.1Fig.2Fig.3Fig.4Fig.5ATop coverAJoints aTop coverJoint aRear coverBBBBLeft side coverJoints bRight side coverJoints bTH-A101-6Prior to performing the following procedure, remove the top cover, the rear cover and the side covers.Disconnect the harness from connector CN802 on the main board on the upper side of the body.Remove the two screws C on the upper side of the body.Remove the three screws D on the bottom of the body.Release the five joints c and detach the front panel assembly toward the front.1.2.3.4.Removing the front panel assembly (See Fig. 6 to 9)Fig.6Fig.7Fig.8Fig.9Front panel assemblyCN802Joint cJoint cCCJoint cFront panel assemblyDDJoint cJoint cFront panel assemblyFront panel assemblyTH-A101-7Prior to performing the following procedure, remove the top cover, the rear cover, the side covers and the front panel assembly.It is not necessary to remove the front panel assembly.Move the left corner cover backward to release the three joint hooks d.Remove the right corner cover in the same way.1.2.Removing the right and left corner covers (See Fig.10 and 11)Prior to performing the following procedure, remove the top cover and the rear cover.Remove the eighteen screws E and the one screw F attaching the rear panel.Release the two joints e on both sides of the body.1.2.Removing the rear panel (See Fig.12 to 14)Fig.10Fig.11Fig.12Fig.12Fig.12Joints dJoint dLeft corner coverRight corner coverJoints dJoint dRear panelEEEEEEEFRear panelRear panelJoint eJoint eTH-A101-8Prior to performing the following procedure, remcover and the right side cover.ove the top cover, the rear Remove the three screws G and pull the DVD servo control board case upward.Disconnect the harness from connector CN501 and CN503, and the card wire from CN101, CN103 and CN502 of the DVD servo control board on the underside of the DVD servo control board case.Remove the four screws H attaching the DVD servo control board.1.2.3.Removing the DVD servo control board (See Fig.15 to 17)Fig.15Fig.16Fig.17Digital I / O boardAnalog I / O boardCN201CN681DVD servo control board (case)CN687GDVD servo control board caseCN501CN503CN502CN103CN101DVD servo control boardDVD servo control board caseHHHHTH-A101-9Prior to performing the following procedure, remove the top cover and the rear cover.Remove the two screws E attaching the analog I / O board on the back of the body.Disconnect the card wire from connector CN201 on the analog I / O board.Remove the four screws E attaching the digital I / O board on the back of the body.Disconnect the card wire from connector CN681 and CN687 on the digital I / O board.1.2.3.4.Removing the analog I / O board / the digital I / O board (See Fig.18 and 19)Prior to performing the following procedure, remove the top cover, the rear cover and the DVD servo control board case.Remove the two screws E attaching the tuner board on the back of the body.Disconnect connector CN111 on the tuner board from the sub board.Disconnect connector CN131 on the sub board from the main board.1.2.3.Removing the tuner board / the sub board (See Fig.20 and 21)Fig.18Fig.19Fig.20Fig.21Digital I / O boardAnalog I / O boardCN201CN681CN687GDVD servo control board (case)Rear panelEEESub boardTuner boardCN111ESub boardCN131TH-A101-10Prior to performing the following procedure, remove the top cover, the rear cover, the front panel assembly, the DVD servo control board case, the analog I / O board, the digital I / O board and the tuner board.Disconnect the harnesses from the spacer on the upper side of the DVD mechanism cover.Remove the two screws I and the one screw J attaching the DVD mechanism cover.Remove the two screws K attaching the DVD mechanism assembly.Remove the DVD mechanism assembly upward while pulling it backward.1.2.3.4.Removing the DVD mechanism assembly (See Fig.22 and 23)Prior to performing the following procedure, remove the top cover, the rear cover, the front panel assembly, the DVD servo control board case and the digital I / O board.Disconnect the harness from the spacer on the upper side of the DVD mechanism cover.Remove the two screws E attaching the power board on the back of the body.Disconnect the harness from connector CN911 and CN912 on the power board.Remove the four screws L attaching the power board.Disconnect connector CN913 and CN914 of the power board from the main board by pulling out them respectively.1.2.3.4.5.Removing the power board (See Fig.24 and 25)Fig.22Fig.23Fig.24Fig.25DVD mechanism coverKJIIKSpacerDVD mechanism assemblyRear panelEEPower boardLCN911,CN912LLMCN914CN913SpacerPower transformer assemblyTH-A101-11Prior to performing the following procedures, remove the top cover and the rear cover.Disconnect the harnesses from connector CN911 and CN912 on the power board.Remove the two screws M attaching the power transformer assembly.Remove the screw E attaching the power transformer assembly on the back of the body.1.2.3.Removing the power transformer assembly (See Fig.24 and 25)Prior to performing the following procedure, remove the top cover, the rear cover, the front panel assembly, the rear panel, the DVD mechanism assembly, the power board and the sub board.Remove the four DVD spacers on the upper side of the main board.Remove the five screws N attaching the main board.1.2.Removing the main board (See Fig.26)Dithe harness from connector CN705 on the power switch board.sconnect Remove the three screws O attaching the power switch board.1.2.Removing the power switch board (See Fig.27)Prior to performing the following procedure, remove the top cover, the rear cover, the side covers and the front panel assembly.Fig.24Fig.25Fig.26Fig.27Rear panelEEPower boardLCN911,CN912LLMCN914CN913SpacerMainboardNNNSOORPower switch boardCN706LED boardIC boardTH-A101-12Disconnect the harness from connector CN702 on the eject board.Remove the three screws P attaching the eject board.1.2.Removing the eject board (See Fig.28)Remove the four screws Q attaching the LCD board.Unsolder WA701, WA703 and WA704 on the LCD board.1.2.Removing the LCD board (See Fig.29)Remove the screw R attaching the IC board.Disconnect the harness from connector CN706 on the IC board.1.2.Removing the IC board (See Fig.27)Prior to pe