Jvc-TN-2006-1026-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2007 Victor Company of Japan, LimitedNo.MY0082007/9CD MECHANISMMY00820079SERVICE MANUALTN2007-1026COPYRIGHT © 2007 Victor Company of Japan, LimitedLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-195 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-191-2 (No.MY008)SECTION 1PRECAUTIONS1.1 Safety Precautions!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.!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.(No.MY008)1-31.2 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laserdiode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.2.1 Grounding to prevent damage by static electricityStatic 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. (1) Ground the workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing thetraverse unit (optical pickup) on it.(2) Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. (3) Handling the optical pickup In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement opticalpickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easilydestroy the laser diode. 1.3 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 thereplacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long atime 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.1.4 Attention when traverse unit is decomposed*Please refer to “Disassembly method“ in the text for the CD pickup unit. Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the flexible wire.1M(caption)Anti-static wrist strapConductive material(conductive sheet) or iron plateWiresPush switchPickupBase boardPickupConnectorFlexible wireFrameCD mechanismassembly1-4 (No.MY008)1.5 Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiationwhen open. Do not stare into beam.(Others) Visible and/or invisible class 1M laser radiationwhen open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation whenopen and inter lock failed or defeated. Avoid directexposure to beam.4.CAUTION : This laser product uses visible and/or 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 ableto function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified here in may result in hazardous radiation exposure. !Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck. (No.MY008)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MY008)SECTION 3DISASSEMBLY3.1 CD mechanism assembly3.1.1 Removing the top cover (See Figs.1 and 2)(1) From the both side of the CD mechanism assembly, re-move the four screws A attaching the top cover. (SeeFig.1.)(2) Lift the front side of the top cover and move the top coverbackward to release the two joints a. (See Figs.1 and 2.)Fig.1Fig.2AAAaTop coverAaTop cover(No.MY008)1-73.1.2 Removing the push switch (See Figs.3)(1) From the bottom side of the CD mechanism assembly, re-move the screw B attaching the push switch.(2) Take out the push switch from the CD mechanism assem-bly.Reference:Remove the wires from soldered sections b of the push switchas required.3.1.3 Removing the base board (See Figs.3 and 4)Caution:Solder the short land c before the flexible wire is disconnectedfrom the connector on the pickup. If the flexible wire is discon-nected without applying solder, the pickup may be destroyedby static electricity. (See Fig.3.)(1) From the bottom side of the CD mechanism assembly, re-move the screw C attaching the base board. (See Figs.3and 4.)(2) Solder the short land c on the pickup. (See Fig.3.)(3) Disconnect the flexible wire from the connector on the pick-up. (See Fig.3.)(4) Remove the base board from the joints d of the frame in thedirection of the arrow. (See Figs.3 and 4.)Reference:Remove the wires from the soldered sections e on the baseboard as required. (See Fig.3.)Caution:When reattaching the base board, be sure to remove solderfrom the short land c after connecting the flexible wire. (SeeFig.3.)Fig.3Fig.4BbWiresPush switchPickupeCBase boarddPickupcConnectorFlexible wireFrameCD mechanismassemblyCBase boardFlexible wireFramed1-8 (No.MY008)3.1.4 Removing the chassis unit (See Figs.5 and 6) Remove the top cover and base board.(1) From the top side of the CD mechanism assembly, removethe front suspension springs and rear suspension springsattaching the chassis unit to the frame. (See Fig.5.)(2) Remove the chassis unit from the dampers on the frame inan upward direction. (See Fig.6.)Note: Pay attention to misuse and loss of each spring. (See Fig.5.) When reassembling, make sure that the three shafts on theunderside of the chassis unit are inserted to the damperscertainly. (See Fig.6.)Fig.5Fig.6Front suspension springRear suspension spring Rear suspension springFront suspension springChassis unitFrameChassis unitShaftShaftShaftDamper RDamper FDamper FFrame(No.MY008)1-93.1.5 Removing the clamper assembly (See Figs.7 and 8) Remove the top cover.Move the clamper assembly in the direction of the arrow to re-lease the joints f from the chassis unit.Fig.7Fig.8f fClamper assemblyChassis unitffClamper assemblyChassis unit1-10 (No.MY008)3.1.6 Removing the loading/feed motor assembly (See Fig.9) Remove the top cover, base board and chassis unit.From the bottom side of the chassis unit, remove the screw Dand take out the loading/feed motor assembly in the direction ofthe arrow.Reference:Remove the wires from the soldered sections g of the loading/feed motor assembly as required.Fig.9DLoading/feedmotorassemblygLoading/feed motor assemblyChassis unit