Jvc-MXDVA-9-R-Service-Manual(1) 电路图 维修手册.pdf

SERVICE MANUAL COMPACT COMPONENT SYSTEM No.21040 Oct. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. MX-DVA9/MX-DVA9R MX-DVA9/MX-DVA9R Contents Safety Precautions Preventing static electricity Precautions for service Important for laser products Disassembly method Adjustment method Flow of functional operation until Toc read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-4 1-5 1-6 1-7 1-28 1-34 1-35 1-35 1-36 B - U.K. EN - Northern Europe MX-DVA9R Area suffix (SP-DSC99TN)(SP-DSS99TN) SP-MXG79CA-MXDVA9/CA-MXDVA9RSP-MXG79 US - Singapore UW - Brazil,Mexico,Peru UJ - U.S.Military UG - Turkey,South Africa,Egypt UN -Asean MX-DVA9 Area suffix A - Australia Center unit Speaker unit CA-MXDVA9/CA-MXDVA9R SP-MXDVA9/SP-MXDVA9R SP-MXG79(Front speaker) SP-DSC99TN(Center speaker) SP-DSS99TN(Surround speaker) RadioFans.CN 收音机爱 好者资料库 MX-DVA9/MX-DVA9R 1-2 1. 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 method Plug 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 each exposed 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.). 1. 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 ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE ! Burrs 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. In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version) RadioFans.CN 收音机爱 好者资料库 MX-DVA9/MX-DVA9R 1-3 1. Service should be performed by qualified personnel only. 2. This equipment has been designed and manufactured to meet international safety standards. 3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. 4. Repairs must be made in accordance with the relevant safety standards. 5. It is essential that safety critical components are replaced by approved parts. 6. If mains voltage selector is provided, check setting for local voltage. 1. 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. 2. Any unauthorised design alterations or additions will void the manufacturers guarantee ; furthermore the manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom. 3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and 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. ! Burrs 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. (U.K only) RadioFans.CN 收音机爱 好者资料库 MX-DVA9/MX-DVA9R 1-4 Preventing static electricity Electrostatic 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 electricity Static 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 workbench 1. 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 yourself 1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling the optical pickup 1. 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 next page.) 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. For specific details, refer to the replacement procedure in the text. 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 it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap MX-DVA9/MX-DVA9R 1-5 Precautions for service Handling of Traverse Unit and Laser Pickup 1. Do not touch any peripheral element of the pickup or the actuator. 2. The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock. 3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.) 4. When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit. 5. Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block. Do not change the setting of these half-fixed resistors for laser power adjustment. Destruction of Traverse Unit and Laser Pickup by Static Electricity Laser diodes are easily destroyed by static electricity charged on clothing or the human body. Before repairing peripheral elements of the traverse unit or pickup, be sure to take the following electrostatic protection: 1. Wear an antistatic wrist wrap. 2. With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, ground the sheet or the plate. When you remove the traverse mechanism from the servo control substrate The laser diode of pick-up might be destroyed by static electricity and set switch (S11) on the pick-up board on SHORT side, please before removing the card wire from connector (CN10). Moreover, please set switch (S11) on OPEN side after assembling and inserting the card wire in connector (CN10) without fail at times. When you remove the pick-up from the traverse mechanism The laser diode of the pick-up might be destroyed by static electricity, and solder with part a, please before extracting a flexible wire from connector (CN12). Moreover, please remove solder in part a after inserting a flexible wire in connector (CN12). CN12 CN10 OPEN SHORT SWITCH S11 Soldering part Traverse mechanism Traverse mechanism Pick-up MX-DVA9/MX-DVA9R 1-6 Important for laser products 1.CLASS 2 LASER PRODUCT 2.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 the Laser 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. REPRODUCTION AND POSITION OF LABELS WARNING LABEL CLASS 2 LASER PRODUCT ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. MX-DVA9/MX-DVA9R 1-7 Remove the six screws A on the back of the body. Remove the two screws B on both sides of the body. Remove the metal cover from the body by lifting the rear part of the cover. 1. 2. 3. Disassembly method Removing the metal cover (See Fig.1 to 3) Do not break the front panel tab fitted to the metal cover. CAUTION: Fig.1 Fig.2 Fig.3 A A A Metal cover Metal cover B Metal cover B MX-DVA9/MX-DVA9R 1-8 Prior to performing the following procedure, remove the metal cover. Disconnect the card wire from connector CN542 on the main board on the right side of the body. Disconnect the wire from CN501 on the DVD servo board in the lower part of the DVD mechanism assembly, on the left side of the body. Remove the screw F from the rear panel on the back of the body. Disconnect the earth terminal extending from the DVD changer mechanism assembly and attached to the terminal on the antenna board. Remove the two screws C on top of the body and the two screws D on back of the body. Remove the DVD changer mechanism from behind upward while pulling the front panel assembly and the rear panel outward. 1. 2. 3. Disconnect the card wire from connector CN540 and CN541 on the inner side of the main board on the right side of the body, and remove the DVD mechanism assembly. 6. Removing the DVD mechanism assembly (See Fig.4 to 7) At this point, the two card wires in the lower part of the DVD mechanism assembly is still connected. REFERENCE: To prevent damage to the DVD fitting, be sure to pull both the rear panel and the front panel assembly enough to remove the DVD changer mechanism assembly. REFERENCE: To prevent damage to the DVD changer mechanism assembly, make sure to pull both the front panel assembly and the rear panel outward enough to remove the DVD changer mechanism assembly. REFERENCE: Fig.4 Fig.5 Fig.6 Fig.7 Front panel assembly CC DVD changer mechanism assembly Rear panel Main board CN542 DVD changer mechanism assembly D Tuner board Front panel assembly Rear panel Front panel assembly DVD changer mechanism assembly CN501 Rear panel Main board CN542 CN541 CN540 F DVD c