Jvc-UXH-350-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 Victor Company of Japan, LimitedNo.MB2972004/7MICRO COMPONENT SYSTEMMB29720047UX-H300,UX-H330,UX-H350TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-185 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20Area suffixUS - SingaporeUT - TaiwanUW - Brazil,Mexico,PeruUX-H300Area suffixUJ - U.S.MilitaryUX-H350Area suffixUT - TaiwanUW - Brazil,Mexico,PeruUX-H3301-2 (No.MB297)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section Output Power 15 W per channel, min. RMS, driven into 4 at 1 kHz with no morethan 10% total harmonic distortion. (IEC268-3)Audio input sensitivity/Impedance (at 1 kHz) AUX:500 mV/50 kSpeakers/Impedance 4 - 16 Tuner FM tuning range 100 kHz intervals 87.5 MHz-108.0 MHz50 kHz intervals 87.50 MHz-108.00 MHzAM tuning range 10 kHz intervals 530 kHz-1 710 kHz9 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 110 V-127 V / AC 220 V- 240 V (adjustable with the voltage se-lector), 50 Hz / 60HzPower consumption 2 W (on standby) 40 W (at operation)Dimensions (W/H/D) (approx.) 152 mm × 233 mm × 292 mmMass (approx.) 3.9 kgSpeaker Section Type Full range, bass-reflex typeSpeakers 10 cm cone × 1Power handling capacity 15 WImpedance 4 Frequency range 100 Hz-15 kHzDimensions (W/H/D) (approx.) 147 mm × 233 mm × 189 mmMass (approx.) 1.9 kg each(No.MB297)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.MB297)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 strapShort-circuit pointCD pickup board(No.MB297)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.MB297)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB297)1-7SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the front panel assembly (See Fig.1 to 6)(1) From the back of the body, remove the two screws A, andthe two screws B attaching the front panel assembly.(2) Remove the six screws D on both sides of the body.(3) Remove the screw E on the bottom of the body.(4) Move the front panel assembly in the direction of the arrowand remove. Disconnect connector CN402, CN801 on themain board and disconnect the wire from FM-ANT.Caution:When reassembling the front panel assembly, fit the right andleft tabs a to the notch.Fig.1Fig.2Fig.3CD mechanism assemblyRear cover assemblyBAFront panelh assemblyCD mechanism assemblyRear cover assemblyDFront panelh assemblyCD mechanism assemblyRear panel assemblyD1-8 (No.MB297)Fig.4Fig.5Fig.6Front panel assemblyRear panel assemblyECD mechanism assemblyFront panel assemblyRear cover assemblyJoint aCD mechanism assemblyFront panel assemblyMain boardRear cover assemblyFM-ANTCN402CN801(No.MB297)1-93.1.2 Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the frontpanel assembly.(1) Disconnect the wire from all connectors on the main board.(2) Disconnect the wire from the two connectors on the cas-sette mechanism assembly.(3) Release the three bands attaching the wire to the mainboard.(4) Remove the two screws F from the front panel assembly.Release the joint b.Fig.7Fig.8CD mechanism assemblyCD mechanism assemblyFront panel assemblyCN203Main boardCN303CN602CN301CN401CN603CN103Main boardbandCD mechanism assemblyFront panel assemblybF1-10 (No.MB297)3.1.3 Removing the CD mechanism assembly (See Fig.9, 10) Prior to performing the following procedure, remove the frontpanel assembly and the main board.(1) Release the four bands setting the wire.(2) Disconnect the wire from the connector on the CD doorswitch and from CN601, CN603 and CN604 on the CDmechanism board respectively.(3) Remove the three screws G attaching the CD mechanismassembly.(4) Release the joint d to remove the CD mechanism assem-bly from the front panel assembly.Fig.9Fig.10CD mechanism assemblyCD door switchCD mechanism boardFront panel assemblyCN604CN603CN601BandBandBandGGGCD mechanism assemblyFront panel assemblyJoint dJoint d