Jvc-UXB-70-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0132003/11MICRO COMPONENT SYSTEMMB013200311UX-B70TABLE OF CONTENTS1 PRECAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-355 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37B - U.K.E - Continental EuropeEN -Northern EuropeArea Suffix1-2 (No.MB013)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section-CA-UXB70Output Power (IEC 268-3) 120 W (60 W + 60 W) at 6 (10% THD)Analog input sensitivity/Impedance (at 1 kHz) AUX/DVD:400 mV/48 kSpeakers/Impedance 6 - 16 Tuner FM tuning range 87.50 MHz-108.00 MHzAM (MW) tuning range 522 kHz-1 629 kHzCD player CD Capacity 5 CDsDynamic range 87 dBSignal-to-noise ratio 90 dBWow and flutter ImmeasurableCassette deck Frequency response:Normal (type I) 60 Hz-14 000 HzWow and flutter 0.15 % (WRMS)General Power requirement AC 230 V , 50 HzPower consumption 110 W (at operation)17 W (on standby)1.4 W (in power save mode)Dimensions (W/H/D) (approx.) 175 mm × 239.5 mm × 378 mmMass (approx.) 8 kgSpeaker Section-SP-UXB70Type 2-way bass-reflex typeSpeakers Woofer 12 cm cone × 1Tweeter 2 cm dome × 1Power handling capacity 60 WImpedance 6 Frequency range 55 Hz to 20 kHzSound pressure level 85 dB/W·mDimensions (W/H/D) (approx.) 145 mm × 239.5 mm × 202 mmMass (approx.) 2.5 kg each(No.MB013)1-3SECTION 1PRECAUTION1.1 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 testingAfter 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 0.5mA 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)0.15 F AC TYPE1-4 (No.MB013)1.5 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.(No.MB013)1-51.6 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 strapPickupFlexible boardShort roundCard wireCN601Servo control boardCard wire1-6 (No.MB013)1.9 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.(No.MB013)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB013)SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the metal cover (See Fig.1 3)(1) Remove the six screws A on the back of the body.(2) Remove the two screws B on the right and left sides of thebody.(3) Detach the rear side of the metal cover upward while pull-ing the bottom of each side, and remove the metal cover.Fig.1Fig.2Fig.3Metal coverAAABB(No.MB013)1-93.1.2 Removing the front panel assembly (See Fig.4 8-2) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from connector CN700 on the mi-com board on the right side of the body.(2) Disconnect the wire from connector CN104 on the regula-tor board on the left side of the body and release the wirefrom the clamp.(3) Remove the two screws C on top of the body.(4) Remove the two screws D on the bottom of the body.(5) Release the joint a on the bottom and the joint b on eachside of the body using the screwdriver. Remove the frontpanel assembly toward the front.Fig.4Fig.5Fig.6Fig.7Fig.8-1Fig.8-2Front panel assemblyCN700Micom boardClampRegulator boardFront panel assemblyCN104CCFront panel assemblyMicom boardCN700DaFront panel assemblybFront panel assemblyb Front panel assembly1-10 (No.MB013)3.1.3 Removing the cassette mechanism control board (See Fig.9) Prior to performing the following procedure, remove the metalcover.(1) Disconnect the card wire from connector CN32 on the cas-sette mecha control board.(2) Remove the two screws E on the left side of the body.(3) Move the cassette mecha control board upward to releasethe joint c.(4) Disconnect the wire from connector CN31 on the inside ofthe cassette mecha control board.Fig.93.1.4 Removing the cassette mechanism assembly (See Fig.10, 11) Prior to performing the following procedure, remove the metalcover and the cassette mechanism control board.(1) Disconnect the card wire from connector CN791 on the mi-com board.(2) Disconnect the wire from connector on the Motor board inthe rear of the cassette mechanism assembly.(3) Remove the two screws C and the two screws F on top ofthe body.Move the rear side of the cassette mechanism assemblyupward and remove.(The chassis bkt. comes off with the cassette mechanismassembly).Fig.10Fig.11CN31EEcCN32Cassette mechacontrol boardCCFFFront panel assemblyCassette mechanism assemblyMicom boardCN791Cassette mechanism assemblyCN750Micom boardMotor boardconnector