Jvc-UXP-55-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.No.220362003/4MICRO COMPONENT SYSTEM2203620034UX-P55TABLE OF CONTENTS1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25CA-UXP55 SP-UXP55COMPACTDIGITAL AUDIOCD TAPE FM/AMMICRO COMPONENT SYSTEM UX·P55CD-R/RW PLAYBACKMD/AUXTIMERCLOCKSTANDBY / ONSTANDBY / ONVOLUMEFUNCTIONSOUNDDIRECT OPERATINGAHB PROREV.MODEPHONES AUTO REVERSEREC/RECSLEEPSTANDBY/ONMD/AUXFM/AMTAPECDDISPLAYDIMMERREPEATRANDOMPROGFM MODEAUTOPRESETSOUNDMODECDCANCEL MULTI KEY SETPTY/EONDISPLAYMODERM-SUXP5R REMOTE CONTROLVOLUMEAHBPROSP-UXP55B - U.K.E - Continental EuropeEN - Norther EuropeArea Suffix1-2 (No.22036)SECTION 1Important Safety Precautions1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testing)After reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse 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 currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15µF AC-type capacitor between an ex-posed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5µmA AC (r.m.s.). 1.2 Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components are replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3 CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4 Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the “ “ mark nearby are criticalfor safety. When replacing them, be sure to use the parts of thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE(No.22036)1-31.5 Safety Precautions (U.K only)(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-ment parts must be identical to those used in the original circuits.(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannotaccept 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 neverbe replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts inthe product have special safety related characteristics. These characteristics are often not evident from visual inspection. Partsother than specified by the manufacturer may not have the same safety characteristics as the recommended replacement partsshown 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 isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, after re-assembling.1.5.1 Warning(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.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.1-4 (No.22036)1.6 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.1.6.1 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. 1.7 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 longa time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.8 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 sections before the flexible wire is disconnected from the connector CN101 on the CD servo board.(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 sections after connecting the flexible wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapCN601 onmechanismboardShorting roundShorting roundFlexible wire(No.22036)1-51.9 Important for laser products1.CLASS 1 LASER PRODUCT2.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 theLaser 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.REPRODUCTION AND POSITION OF LABEL and PRINTWARNING LABEL and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CautionLabel1-6 (No.22036)SECTION 2Disassembly method2.1 Main body2.1.1 Removing the metal cover (See Fig.1, 2)(1) Remove the six screws A on the back of the body.(2) Remove the two screws B on the side of the body.(3) Pull both sides of the metal cover outward and lift the rearpart of the cover.Fig.1Fig.2AMetal coverAAAAMetal coverB x 2(No.22036)1-72.1.2 Removing the rear cover (See Fig.3) Prior to performing the following procedure, remove the metalcover.(1) Remove the two screws C on the back of the body.Fig.32.1.3 Removing the tuner board (See Fig.4, 5) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from connector CN1 on the tunerboard.(2) Remove the screw D on the right side of the body.(3) Remove the two screws E on the rear panel.(4) Remove the band bundling the wire and pull out the wirethrough the hole of the CD-R board.Fig.4Fig.5Rear coverCCRear panelDTuner boardCD-R board CN 1BandRear coverERear panel1-8 (No.22036)2.1.4 Removing the CD-R mechanism assembly (See Fig.6 8) Prior to performing the following procedure, remove the metalcover and the rear cover.(1) Disconnect the card wires from connector CN903, CN904and the wire from CN905 on the main board on the upperside of the body.(2) Remove the screw D attaching the tuner board and theCD-R mechanism on the right side of the body.(3) Remove the two screws F attaching the rear panel and theCD-R mechanism on the back of the body.(4) Move the rear part of the CD-R mechanism assembly up-wards to disengage the two joints a and release from therear panel.Pull the front panel toward the front and move the rear partof the CD-R mechanism assembly upwards. Then pull outthe CD-R mechanism assembly from the front panel back-ward.REFERENCE:To remove the CD-R mechanism assembly efficiently, discon-nect the card wireconnecting the tuner board with the mainboard in advance.2.1.5 Remove the rear panel (See Fig.8 11) Prior to performing the following procedure, remove the metalcover, rear cover and the CD-R mechanism assembly.(1) Remove the seven screws G attaching the rear panel.(2) Disconnect the card wire from CN902 on the main board.(3) Disengage the lower two joints b on each side of the rearpanel using a screwdriver and remove the rear panel back-ward (The tuner board and the fan will be also de-tached.Remove them as needed).2.1.6 Removing the fan (See Fig.9 12) Prior to performing the following procedure, remove the metalcover, the rear cover andthe CD-R mechanism assembly.(1) Disconnect the wire from connector CN908 on the mainboard.(2) Remove the two screws H on the back of the body.(3) Move the fan upwards to disengage the four joints c and re-lease from the rear panel.Fig.6Fig.7Front panel assembly CD-R mechanism assemblyCN904CN903Main boardCN905Tuner boardRear panelCard wiresTuner boardCD-R mechanismassemblyFront panel assemblyCN 1Band(No.22036)1-9Fig.8Fig.9Fig.10Fig.11Fig.12Rear panelFGGGJoint a Joint aGFanCN902Tuner boardRear panelMain boardCN908Rear panelJoint bJoint bRear panelRear panelH HFanJoint cJoint cJoint cJoint c1-10 (No.22036)2.1.7 Removing the power amplifier board / power amplifi-er sub board / main board / heat sink (See Fig.13 21) Prior to performing the following procedure, remove the metalcover, the rear cover, the CD-R mechanism assembly and therear panel.(1) Disconnect the card wire from connector CN900, CN90