Jvc-UXA-10-Service-Manual电路原理图.pdf

SERVICE MANUALMICRO COMPONENT MD SYSTEMNo.22011Jan. 2003COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.UX-A10DVDUX-A10DVDContentsSafety precautionPreventing static electricityDisassembly methodAdjustment methodMaintenance of MD pickup1-21-31-41-391-47Procedures of changing the MD pickupMaintenance of DVD pickupProcedures of changing the DVD pickupDescription of major ICs1-471-481-481-4988Area suffixUB - Hong Kong1-2UX-A10DVD1. 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 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 groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 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.)1-3UX-A10DVDCN101Sorting round pointCN101Flexible wireServo control boardDVD mechanism assemblyMD mechanism assemblyCN321PickupSolderingPreventing static electricity1.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 Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbenchGround 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 yourselfUse an anti-static wrist strap to release any static electricity built up in your body. 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 tester's internal power source can easily destroy the laser diode.Attention when traverse unit is decomposed1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the pick-up assembly might destroy.) 2.Please remove solder after connecting the card wire with when you install picking up in the substrate.*Please refer to “Disassembly method“ in the text for pick-up and how todetach the substrate. (caption)Anti-static wrist strapConductive material (conductive sheet) or iron plate1-4UX-A10DVDRemove the six screws A on the back of the body.Remove the screw B on each side of the body.Detach the rear side of the metal cover upward while pulling the lower sides outward.1.2.3.Disassembly methodRemoving the metal cover (See Fig.13)Fig.1Fig.2Fig.3AAAMetal coverMetal coverMetal coverBB1-5UX-A10DVDPrior to performing the following procedure, remove the metal cover.Remove the three screws C attaching the DVD mechanism assembly on top of the body.Disconnect connector CN502 and CN503 on the DVD servo board upward at the bottom of the DVD mechanism assembly.Bring up the DVD mechanism assembly and remove backward.1.2.Removing the DVD mechanism assembly (See Fig.46)Fig.4Fig.5Fig.6CCCDVD mechanism assemblyDVD mechanism assemblyCN503CN502DVD mechanism assembly1-6UX-A10DVDPrior to performing the following procedure, remove the metal cover and the DVD mechanism assembly.Disconnect the card wire from connector CN705 on the microcomputer board in the center of the right side of the body.Disconnect the card wire from connector CN301 on the main board in the center of the left side of the body.Disconnect the card wire from connector CN704, and the wires from CN703 and CN710 on the microcomputer board.1.2.3.Removing the front panel assembly(See Fig.710)Disconnect the card wire from connector CN442 on the FL connection board on top of the body.Remove the screw D on each side of the body.Remove the two screws E on the bottom of the body.Release the joint a on the bottom and the two joints b on the right and left sides of the body using a screwdriver. Remove the front panel assembly toward the front.4. 5. 6. 7.When disconnecting the wires from CN703 and CN710, remove the spacer attaching the wires.ATTENTION: Fig.7Fig.8Fig.10Fig.9Front panel assemblyDDMicrocomputer boardCN705Microcomputer boardCN704bFront panel assemblybCN703CN710Main boardCN301FL connection boardCN442Front panel assemblyMicrocomputer boardCN704SpacerSpacerCN710CN703EEaFront panel assembly1-7UX-A10DVDPrior to performing the following procedure, remove the metal cover and the DVD mechanism assembly.Remove the two screws F on the back of the body.Disconnect the wire from connector CN1 on the tuner pack on the right side of the body.Remove the thirteen screws G on the back of the body.Release the two joints c on the lower right and left sides of the rear panel.1.2.3.4.Removing the rear cover/ rear panel(See Fig.1115)The rear panel with the tuner pack comes off.REFERENCE: Fig.15Fig.14FIg.13Fig.11Fig.12Rear panelTuner packCN1Rear panelGFFGGGGGRear panelccRear panelRear panelRear cover1-8UX-A10DVDPrior to performing the following procedure, remove the metal cover.Disconnect the card wire from connector CN1 on the tuner pack on the right side of the body.Remove the two screws H on the back of the body.1.2.Removing the tuner pack (See Fig.16)Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the rear cover/rear panel and the DVD relay board.Disconnect the wire from connector CN711 on the microcomputer board on the right side of the body.Remove the three screws I attaching the fan bracket on top of the body and release the joint d.Remove the two screws J attaching the fan.1.2.3.Removing the fan (See Fig.17,18)Fig.17Fig.18Fig.16Tuner packCN1HCN711Fan bracketFan bracketdIJIFan1-9UX-A10DVDPrior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the front panel assembly.Remove the two screws K attaching the DVD mechanism attaching bracket.Remove the two screws L on each side of the MD mechanism assembly and remove the MD mechanism assembly toward the front.Disconnect the card wire from connector CN521 on the MD mechanism assembly board.1.2.3.Removing the MD mechanism assembly(See Fig.1921)Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the front panel assembly.Disconnect the wire from connector CN310 on the main board on the left side of the body.Release the wires from the two clamps on the bottom chassis.Remove the screw M attaching the headphone board on the right side of the body.1.2.3.Removing the headphone board(See Fig.22,23)Fig.21Fig.23Fig.22Fig.20 Fig.19MD mechanism assemblyMD mechanism assemblyMD mechanism assemblyCN521DVD mechanism attaching bracketDVD mechanism attaching bracketLLKHeadphone boardClampMain boardCN310Headphone boardM1-10UX-A10DVDPrior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assembly and the rear cover/ rear panel.Remove the two screws N and the three screws O. Remove the heat sink.Disconnect the wires from connector CN307 and CN310, the card wire from CN312 on the main board on the left side of the body.Remove the screw P and Q attaching the main board.Disconnect connector CN303, CN304, CN305 and CN306 on the main board. Release the two joints e at the bottom.Draw out the main board and disconnect the card wire and the wire from connector CN302 and CN311.1.2.3.4.5.Removing the main board(See Fig.24,25)Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the rear panel/ rear cover.Disconnect the card wire from connector CN515 on the DVD relay board.Remove the screw R attaching the DVD relay board on top of the body.Disconnect connector CN511 and CN512 on the DVD relay board.1.2.3.Removing the DVD relay board(See Fig.26)Fig.26Fig.25Fig.24CN307CN312CN310CN302CN311eeQPHeat sinkMain boardCN303 CN304CN305 CN306 Main boardNOHeat sinkRCN515 CN511CN512DVD connector boardMain board