JVC-MXDVB10-cs-sm维修电路原理图.pdf

SERVICE MANUAL COMPACT COMPONENT SYSTEM No.21120 Sep. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. MX-DVB10 MX-DVB10 Safety precautions Preventing static electricity Precautions for service Important for laser products Disassembly method Adjustment method 1-2 1-3 1-4 1-5 1-6 1-26 Maintenance of laser pickup Replacement of laser pickup Flow of functional operation until TOC read Description of major ICs 1-34 1-34 1-35 1-3670 Contents Area suffix US - Singapore UX - Saudi Arabia UN -Asean (SP-XCDVB10) (SP-XSDVB10) (CA-MXDVB10) (SP-WDVB10) (SP-XDVB10) (SP-XDVB10) (SP-WDVB10) (SP-XSDVB10) MAIN MAIN SUBWOOFER REAR REARCENTER SUBWOOFER RadioFans.CN 收音机爱 好者资料库 MX-DVB10 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 current 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 measure the AC voltage across the resistor. Now, reverse 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. (This regulation does not correspond to J and C version.) RadioFans.CN 收音机爱 好者资料库 MX-DVB10 1-3 Preventing static electricity 1. Grounding to prevent damage by 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. 2. About the earth processing for the destruction prevention by static electricity In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench 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. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 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 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. 4. 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 it. Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap MX-DVB10 1-4 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. Before extracting the flexible wire from connector (CN12), please solder point A as shown below. Moreover, please remove solder in point A after inserting a flexible wire in connector (CN12). CN12 CN10 Soldering points A Traverse mechanism Traverse mechanism Pick-up OPEN SHORT SWITCH S11 MX-DVB10 1-5 Important for laser products 1. CLASS 1 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 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 herein may result in hazardous radiation exposure. VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. ADVARSEL : Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL ! CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d) ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (f) CLASS 1 LASER PRODUCT MX-DVB10 1-6 Remove the six screws marked A on the back of the body. Remove the two screws marked 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: Prior to performing the following procedures, remove the metal cover. Disconnect the card wire from connector CN1 on the tuner board. Remove the plastic rivet fixing the tuner board. Remove the two screws marked C on the back of the body. 1. 2. 3. Removing the tuner board (See Fig.4) Fig.1 Fig.2 Fig.3 A AA Metal cover Metal cover B Metal cover B Fig.4 DVD changer mechanism assembly CN1 Front panel assembly Plastic rivet Rear panel C Tuner board MX-DVB10 1-7 Prior to performing the following procedures, remove the metal cover and the tuner board. Disconnect the card wire from the connectors CN540, CN541 and CN542 on the main board. Remove the two screws marked D on the upper side of the body and two screws marked F on the back of rear panel. Remove the plastic rivet attaching the main board. Pull both the rear panel and the front panel assembly to the outside, then remove the DVD changer mechanism assembly by lifting the rear part of the assembly. 1. 2. 3. 4. Removing the DVD changer mechanism assembly (See Fig.5 to 6) 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. CAUTION: Fig.5 Fig.6 Front panel assembly DD DVD changer mechanism assembly Rear panel CN542 DVD changer mechanism assembly F Front panel assembly Plastic rivet Rear panel CN541 CN540 Main board Main board MX-DVB10 1-8 Prior to performing the following procedures, remove the metal cover, the tuner board and the DVD changer mechanism assembly. Remove the plastic rivet attaching the main board. Disconnect the card wires from the connector CN500, CN505 and CN510 on the main board respectively. Remove the tie band and disconnect the wire from the connector CN513 on the main board. Disconnect the wire from the connector CN220 on the transformer board. Remove the two screws marked G on the bottom of the body. Release the two joints marked a on the lower right and left sides of the body using a screwdriver, and remove the front panel assembly toward the front. 1. 2. 3. 4. 5. 6. Removing the front panel assembly (See Fig.7 to 11) Fig.9 Fig.10 Fig.11 G (Bottom) Front panel assembly Joint a Joint a Front panel assembly Front panel assembly Fig.7 Fig.8 Tie band CN500 CN505 CN510 Transformer board CN220 Front panel assembly Front panel assembly Main board Plastic rivet CN513 Main board MX-DVB10 1-9 Prior to performing the following procedures, remove the metal cover, the tuner board and the DVD changer mechanism assembly. Remove the screw marked H attaching the rear cover on the back of the body. Push each tab of the four joints marked b in the direction of the arrow and release. Remove the seventeen screws marked I attaching the rear panel. Release the joints marked c on each lower side of the rear panel using a screwdriver and remove the rear panel backward. 1. 2. 3. 4. Removing the rear cover / rear panel (See Fig.12 to 15) Prior to performing the following procedures, remove the metal cover, the tuner board the DVD changer mechanism assembly and rear panel. Move the power cord stopper upward and pull out it from the base chassis. Disconnect the power cord from connector CN250 on the power supply board. Remove the tie band from the power supply board. 1. 2. 3. Fig.12 Fig.13 Fig.14 F