Jvc-UXH-35-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0532003/9MICRO COMPONENT SYSTEMMB05320039UX-H35TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-195 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23MICRO COMPONENT SYSTEMArea SuffixA - Australia1-2 (No.MB053)SPECIFICATIONAmplifier Output Power 20 W (10 W + 10 W) at 4 (10% THD)Audio input sensitivity/Impedance (at 1 kHz) AUX 500 mV/48.75 kSpeakers/Impedance 4 Tuner FM tuning range 87.50 MHz - 108.00 MHzAM tuning range 522 kHz - 1 629 kHzCD player Dynamic range 85 dBSignal-to-noise ratio 90 dBWow and flutter ImmeasurableCassette deck Frequency response Normal (type I) 50 Hz - 15 000 HzWow and flutter 0.15% (WRMS)Speaker Speaker units Full range 8.0 cm cone × 1Impedance 4 Dimensions (approx.) 135 mm × 203 mm × 190 mm (W/H/D)Mass (approx.) 1.7 kg eachGeneral Power requirement AC IN 240 V , 50 HzDC IN 12 V, 4 APower consumption 35 W (at operation)3.0 W (on standby)Dimensions (approx.) 412 mm × 208 mm × 275 mm (W/H/D)Mass (approx.) 6.5 kg(No.MB053)1-3SECTION 1PRECAUTION1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purposes.For continued protection, no changes should be made to theoriginal design unless authorized in writing by the man-ufacturer. Replacement parts must be identical to thoseused 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 special safetycharacteristics are identified in the Parts List of Service Manu-al. Electrical components having such features are iden-tified by shading on the schematics and by ( ) on theParts List in the Service Manual. The use of a substitute re-placement which does not have the same safety character-istics as the recommended replacement parts shown in theParts List of Service Manual may create shock, fire, or oth-er 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 reassembling.(5) Leakage shock hazard testing)After reassembling the product, always perform an isolationcheck on the exposed metal parts of the product (antennaterminals, knobs, metal cabinet, screw heads, headphonejack, control shafts, etc.) to be sure the product is safe tooperate without danger of electrical shock.Do not use 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 an ACvoltmeter having, 1,000 ohms per volt or more sensitivity inthe following manner. Connect a 1,500 ohm 10W resistorparalleled by a 0.15 µF AC-type capacitor between anexposed 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 metal part,particularly any exposed metal part having a return path tothe chassis, and measure the AC voltage across the resistor.Now, reverse the plug in the AC outlet and repeat eachmeasurement. Voltage measured any must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5 mA 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 the same typeand rating as specified by the manufacturer. (Except the JC version)1-4 (No.MB053)1.5 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode 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 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. 1.6 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 the replace-ment procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a timewhen 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.1.7 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 CN601 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.CN601 onmechanismboardShorting roundShorting roundFlexible wire(No.MB053)1-51.8 Important for laser products (1) CLASS 1 LASER PRODUCT(2) DANGER : Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.(3) CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace thecomplete Laser Unit if it malfunctions.(4) CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches which prevent emission of radiation when the drawer is open andthe safety interlocks have failed or are de feated. 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 ofprocedures other than those specified herein may result inhazardous radiation exposure.CAUTIONPlease use enough caution not to see the beam directlyor touch it in case of anadjustment or operation check.VARNINGOsynlig laserstrålning är denna del är öppnad och spårren ärurkopplad. Betrakta ej strålen.VAROAvattaessa ja suojalukitus ohitettaessa olet alttiina näkymät-tömälle lasersäteilylle. Älä katso säteeseen.ADVARSELUsynlig laserstråling ved åbning, når sikkerhedsafbrydere erude af funktion. Undgå udsasttelse for stråling.ADVARSELUsynlig laserstråling ved åpning, når sikkerhetsbryteren er avs-lott. unngå utsettelse for stråling.REPRODUCTION AND POSITION OF LABELSCaution label1-6 (No.MB053)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB053)1-7SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the rear panel(See Fig.1,2)(1) From behind the body, remove the eight screws A attach-ing the rear panel.(2) Turing the body upside down, remove the two screws B at-taching the rear panel, and remove.Fig.1Fig.2AAAABBCCFront panel assemblyRear panel1-8 (No.MB053)3.1.2 Removning the side panel (L) and (R)(See Fig.25) Prior to performing the following procedure, remove the rearpanel.(1) Turning the body upside down, remove the two screws Cattaching the front panel assembly.(2) Turning the body initial position, open the CD door whilepressing the upper OPEN button.(3) Moving the side panel (L) in the arrow direction, remove thepanel from the left side of the body.(4) Moving the side panel (R) in the arrow direction, removethe panel from the right side of the body.Fig.3Fig.4Fig.5Side panel (L)Side panel (R)(No.MB053)1-93.1.3 Removing the CD player assembly(See Fig.6,7) Prior to performing the following procedure, remove the rearpanel and the left and right side panels.(1) Disconnect the card wires from the two connectors CN603and CN604 on the CD servo control board.(2) Remove the two screws D attaching the front panel assem-bly on the both sides.(3) Release the two joints a on the both sides of the front panelassembly.(4) Move the CD player assembly in the direction of the arrow.Fig.6Fig.7CD player assembly CD servo control boardCN604DaCN603DCD player assemblya1-10 (No.MB053)3.1.4 Removing the power amplifier board and heat sink(See Fig.810) Prior to performing the following procedure, remove the rearpanel, the left and right side panels, and the CD player assem-bly.(1) Remove the five screws E and F attaching the heat sink.(2) Disconnect the wire from connector CN901 on the powersupply board.(3) Disconnect the card wire from connector CN305 on thepower amplifier board.(4) Remove the screw G attaching the power amplifier board.(5) Disconnect the connector CN301 on the power amplifierboard, and release the two joints b.REFERENCE:Remove the screw F, then power amplifier board can be re-moved without removing heat sink.Fig.8Fig.9Fig.10EEFHeat sinkPower amplifier boardCN301Power supply boardCN901 CN305Power amplifier boardGbb