Jvc-UXG-30-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2006 Victor Company of Japan, LimitedNo.MB5362006/6MICRO COMPONENT SYSTEMMB53620066UX-G35US,UX-G35UB,UX-G33A,UX-G33US,UX-G33UB,UX-G33UW,UX-G30US,UX-G30UB,UX-G30UWLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-215 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22CA-UXG35 SP-UXG35SP-UXG35CA-UXG33 SP-UXG33SP-UXG33CA-UXG30 SP-UXG30SP-UXG301-2 (No.MB536)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier section Output Power 60 W (30 W + 30 W) at 6 (10% THD)Speakers/Impedance 6 - 16 Audio Input AUX 500 mV/50 k (at “AUX LVL 1“)250 mV/50 k (at “AUX LVL 2“)125 mV/50 k (at “AUX LVL 3“)Tuner section FM tuning range 531 kHz - 1 710 kHz (at 9 kHz intervals)AM tuning range 530 kHz - 1 710 kHz (at 10 kHz intervals)CD player section Dynamic range 88 dBSignal-to-noise ratio 93 dBWow and flutter ImmeasurableCassette deck section Frequency response Normal (type I): 50 Hz - 14 000 HzWow and flutter 0.15% (WRMS)Speakers Speaker units 10 cm cone × 1 + 1.5 cm dome × 1Impedance 6 Dimensions (approx.) 140 mm × 231 mm × 195 mm (W/H/D)Mass (approx.) 1.7 kg eachGeneral Power requirement Hong Kong AC 220 V , 50 HzAustralia AC 240 V , 50 Hzother AC 110 V/AC 127 V/AC 220 V/AC 230 V - 240 V , 50 Hz/60 Hz(adjustable with the voltage selector)Power consumption Hong Kong 50 W (at operation)9.5 W (on standby/display on)1.1 W (on standby/display off)Australia 50 W (at operation)10 W (on standby/display on)1.3 W (on standby/display off)other 60 W (at operation)14.8 W (on standby/display on)3.8 W (on standby/display off)Dimensions (approx.) 165 mm × 231 mm × 328 mm (W/H/D)Mass (approx.) 4.5 kg(No.MB536)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.MB536)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.MB536)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 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. 1.7 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 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.1.8 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 card wire is disconnected from the connecto on the servo board. (If the card wireis 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 card wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapPickup connector Card wireShort land section1-6 (No.MB536)1.9 Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiationwhen open. Do not stare into beam.(Others) Visible and/or invisible class 1M laser radiationwhen open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation whenopen and inter lock failed or defeated. Avoid directexposure to beam.4.CAUTION : This laser product uses visible and/or 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 ableto 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 LABELS and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck. WARNING LABEL and PRINT(No.MB536)1-7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB536)SECTION 3DISASSEMBLY3.1 Main Body3.1.1 Removing the side panel (See Fig.1 to 3)(1) Remove the one screw A attaching the rear cover. (SeeFig.1)(2) Remove the five screws B attaching the side panel and topcover. (See Fig.1)(3) Remove the two screws C attaching the front panel assem-bly. (See Fig.2)(4) Slide the both side panels in the direction of the arrow. (SeeFig.3)Fig.1Fig.2Fig.3BABC(both side)(No.MB536)1-93.1.2 Removing the front panel assembly (See Fig.4)(1) Remove the two screws D attaching the front panel and topcover.(2) Disconnect the card wire of the switch board from the con-nector CN401 of the micon board.(3) Disengage the two hooks a then remove the front panel as-sembly. Fig.43.1.3 Removing the top cover (See Fig.5)(1) Disconnect the card wire from connector CN100.Fig.5CN401aDaDCN100RRR1-10 (No.MB536)3.1.4 Removing the tuner pack (See Fig.6, 7)(1) Disconnect the card wire of the tuner pack from connectorCN405 of the micon board. (See Fig.6)(2) Remove the two screws E attaching the tuner pack. (SeeFig.7)3.1.5 Removing the micon board (See Fig.6 to 8)(1) Remove the two screws F attaching the micon board. (SeeFig.7)(2) Disconnect the card wires from connectors CN400, CN406of the micon board. (See Fig.6)(3) Disconnect the micon board from the power amplifier boardin the direction of the arrow while releasing the claw b, c ofthe connectors CN151, CN152 on the power amplifierboard. (See Fig.8)(4) Remove the tow screws G attaching the micon board. (SeeFig.6)3.1.6 Removing the power amplifier board (See Fig.7, 8)(1) Remove the two screws H attaching the power IC. (SeeFig.7)(2) Remove the one screw J attaching the amplifier board.(See Fig.8)(3) Disconnect the power amplifier board from the trans boardin the direction of the arrow while releasing the claw d ofthe connector CN150 on the power amplifier board. (SeeFig.8)Fig.6Fig.7CN405CN406CN400GEFHLHP