Jvc-UXH-100-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 Victor Company of Japan, LimitedNo.MB2482004/7MICRO COMPONENT SYSTEMMB24820047UX-H100TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-165 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17Area suffixA - AustraliaUS - SingaporeUT - TaiwanUW - Brazil,Mexico,PeruUJ - U.S.Military1-2 (No.MB248)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section-CA-UXH100 Output Power 10 W per channel, min. RMS, driven into 6 at 1 kHz,with no more than 10% total harmonic distortion (IEC268-3)Speakers/Impedance 6 - 16 Tuner FM tuning range FM 100 kHz intervals 87.5 MHz-108.0 MHzFM 50 kHz intervals 87.50 MHz-108.00 MHzAM tuning range AM 10 kHz intervals 530 kHz-1 710 kHzAM 9 kHz intervals: 531 kHz-1 710 kHzCD player Dynamic range 85 dBSignal-to-noise ratio 85 dBWow and flutter ImmeasurableCassette deck Frequency response Normal (type I) 100 Hz-10 000 HzWow and flutter 0.35 % (WRMS)General Power requirement AC 110V-127V/220V-240 V , adjustable with the voltageselector, 50 Hz/60 HzPower consumption 38 W (at operation) 2 W (on standby)Dimensions (W/H/D) (approx.) 144 mm × 255 mm × 277 mmMass (approx.) 2.9 kgSpeaker Section-SP-UXH100 Type Full range Bass-reflex typeSpeakers 10 cm cone × 1Power handling capacity 10 WImpedance 6 Frequency range 100 Hz to 15 kHzDimensions (W/H/D) (approx.) 130 mm × 257 mm × 151 mmMass (approx.) 1.5 kg each(No.MB248)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)1500 10W0.15 F AC TYPE1-4 (No.MB248)1.5 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.1.5.1 Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. 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. 1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.7 Attention when traverse unit is decomposed*Please refer to “Disassembly method“ in the text for the pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexiblewire is disconnected without applying solder, the 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 strapSolderingFlexible cableCD changer unit(No.MB248)1-51.8 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 CD,MD and DVD 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 here in may result in hazardous radiation exposure.REPRODUCTION AND POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrålning när den öppnas och spärren ärurkopplad. Betrakta ejstrålen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömällelasersäteilylle. Vältä säteenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstråling når maskinen eråben eller interlocken fejeler.Undgå direkte eksponering til stråling. (d)WARNING LABEL1-6 (No.MB248)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB248)1-7SECTION 3DISASSEMBLY3.1 Disassembly of the main blocks of the set3.1.1 Replacing the fuses (See Fig.1) Prior to performing the following procedure, remove the rearcover.(1) Replace the fuses inside.Caution:Be sure to use fuses with the specified ratings.Fig.13.1.2 Replacing the power IC (See Fig.2) Prior to performing the following procedure, remove the rearcover.(1) Remove the two screws A from the heat sink between thepower IC.(2) Remove the solder fixing the power IC.Fig.2Fuse (F901)800MAL 250VFuse (F902)T315MAL 250VA1-8 (No.MB248)3.1.3 Removing the rear cover (See Fig.3 and 4)(1) Remove the seven screws C that retain the rear cover fromthe back of the body.(2) Remove the eight screws D that retain the rear cover fromthe two sides of the body.(3) Remove the rear cover from the body by pulling it towardthe back.Caution:The FM terminal wire (inside) must be pulled out, while remov-ing the rear cover.Fig.3Fig.4Rear coverCCCDD D(No.MB248)1-93.1.4 Removing the CD chassis assembly (See Fig.5 to 8) Prior to performing the following procedures, remove the rearcover.(1) Remove a screw E retaining the main board onto the CDchassis.(2) Disconnect the two FFC cables X1, X2 from the connectorsCN704, CN703 on the CD board.(3) Disengage the claws F on both sides of the body, whilemoving the CD chassis assembly downward and back-ward.(4) Before you take away the CD chassis assembly, you mustdisconnect the wire from the connector CN204 on the mainboard. (Fig.8)Caution:You must ensure that the two claws of the CD chassis's top Gare disengaged, while moving the CD chassis assembly.Fig.5Fig.6Fig.7Fig.8EFX1X2GCassette mechanism1-10 (No.MB248)3.1.5 Removing the CD mechanism (See Fig.9 to 13) Prior to performing the following procedures, remove the rearcover. Also remove the CD chassis assembly.(1) Remove the three screws Y1 retaining the CD board.(2) Disconnect the FFC cable Y2 from the connector CN701.(3) Disconnect the two parallel wires Y3 from the connector.(4) Remove the four screws Y4 with washers retaining the CDmechanism.Fig.9Fig.10Fig.11Fig.12Fig.13Y1Y2Y3Y3Y4