Jvc-MXSK-1-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB2072004/4COMPACT COMPONENT SYSTEMMB20720043MX-SK1TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-305 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34COMPACTDIGITAL AUDIOCOMPACTDIGITAL VIDEOPHONESACTIVEBASS EX.EJECTEJECTDISCSELECTSELECTM X - S K 3COMPACTDIGITAL VIDEOVOLUMESTANDBY/ONFM MODEAUXSLEEPFM/AMVIDEO INTROPREV. NEXTHIGHLIGHTON SCREENSETENTERRETURNPBC STILL KEY CONTROLDISC 1 DISC 2 DISC 3 DISCREPEAT PROGRAM RANDOM PROGRAMCANCELSOUNDTURBOSOUNDMODEACTIVEBASS EX.TAPE-AKARAOKE MPXECHO FADEMUTINGTAPE-BVOLUMEREMOTE CONTROLSTART/STOPRECCA-MXSK1SP-MXSK1 SP-MXSK1EE - Russian FederationArea suffix1-2 (No.MB207)SPECIFICATIONDesign & specifications are subject to change without notice.Amplifier sectionOutput Power MAIN SPEAKERS 64 W per channel min. RMS both channels driven into6 at 1 kHz with no more than 0.9% total harmonicdistortion.Audio input sensitivity/Impedance(Measured at 1 kHz with tape record-ing signal 300 mV)AUX 400 mV/50 kMIC 3 mV/10 kTunerFM tuning range 87.50 MHz to 108.00 MHzAM tuning range At 9 kHz intervals 531 kHz to 1 710 kHzAt 10 kHz intervals 530 kHz to 1 710 kHzCD playerCD capacity 3 CDsDynamic range 85 dBSignal-to-noise ratio 90 dBWow and flutter ImmeasurableCassette deckFrequency response Normal (type I) 50 Hz to 14 000 HzWow and flutter 0.15% (WRMS)GeneralPower requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V to AC 240 V (adjustable with the voltage selector)Power consumption 50 Hz / 60 Hz100 W (at operation)20 W (on standby)Dimensions (approx.) 270 mm x 306 mm x 433.5 mm (W/H/D)Mass (approx.) 9.2 kgSpeaker SpecificationsType 3-Way 3 Speaker Bass-Reflex (Magnetically-Shielded Type)Speakers Main woofer 15cm cone x 1Mid Range 5.0cm cone x 1Tweeter 2.0cm dome x 1Power Handling Capacity 80 WImpedance 6 Frequency Range 42 Hz to 30 000HzSound Pressure Level 84 dB/W.mDimensions (W x H xD) 215mm x 306 mm x 243 mmMass 3.4 kg(No.MB207)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.MB207)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 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 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.1.7 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 connecto on the CD servo board. (If theflexible 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 strap(No.MB207)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB207)SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the metal cover(See Fig.13)(1) Remove the six screws A on the back of the main body.(2) Remove the four screws B on each side of the body. (3) Remove the metal cover from the body by lifting the rearpart of the cover.CAUTION :Do not break the front panel tab fitted to the metal cover.Fig.1Fig.2Fig.3AAABB(No.MB207)1-73.1.2 Removing the CD fitting(See Fig.46) Prior to performing the following procedure, remove the metalcover.ATTENTION : Be sure to remove the CD tray fitting before removing theCD changer unit.(1) Press the STANDBY button. Press the OPEN/CLOSE but-ton to eject the CD trey.(2) Move the CD trey fitting upward and release the joint a.(3) Press the OPEN/ CLOSE button to insert the tray.Fig.4Fig.5Fig.6CD traySTANDBY / ON buttonOPEN / CLOSE buttonCD tray fittingJoint aJoint aCD tray1-8 (No.MB207)3.1.3 Removing the CD fitting(See Fig.57) How to eject the CD trey without turning on power.(1) Turn the loading pulley gear marked b from the back ofthe CD changer unit as shown in Fig.7 and draw the CDtray toward the front.(2) Move the CD tray fitting upward and release the joint a.(3) Push and insert the CD tray manually.Fig.73.1.4 Removing the CD changer unit(See Fig.8 10) Prior to performing the following procedure, remove the metalcover and the CD fitting.(1) Disconnect the wire from connector CN13 on the mainboard.(2) On the right side of the body, disconnect the card wire fromconnector CN651 on the CD board in the bottom of the CDchanger unit.(3) Remove the four screws D attaching the CD changer uniton both sides of the body.(4) Remove the three screws E on the back of the body.(5) Move the CD changer unit in the direction of the arrow withpulling the rear panel and the front panel assembly out-ward.Fig.8Fig.9Fig.10Marked bLoading pulley gearDFront panel assemblyMain borad(CN13)Rear panelCN651CD changer unitDFront panel assemblyMain borad(CN13)Rear panelCN651CD changer unitEERear panel(No.MB207)1-93.1.5 Removing the CD board(See Fig.1113) Prior to performing the following procedure, remove the metalcover and the CD changer unit.Caution :Before disconnecting the card wire extending from the CDpickup, make sure to solder the short-circuit point on the CDpickup(Fig.12 and 13). If you do not follow this instruction,the CD pickup may be damaged.(1) Remove the four screws F attaching the CD board on thebottom of the CD changer unit.(2) Turn and move the CD board as shown in Fig.12.(3) Disconnect the wire from the CD mechanism board.(4) Solder the short-circuit point on the CD pickup section.(5) Disconnect the card wire from CN601 on the CD board.Caution :When reassembling, unsolder the short-circuit point after con-necting the card wire to CN601 on the CD board.Fig.11Fig.12Fig.13CD boardCD mechanism boardCD changer unitFFCD mechanisum boardCD board (CN601)Short round(Short-circuit)Pick upCard wireShort round(short-circuit)1-10 (No.MB207)3.1.6 Removing the front panel assembly(See Fig.1416) Prior to performing the following procedure, remove the metalcover and the CD changer unit.(1) Disconnect the card wire from the connector CN315,CN316 and CN870 on the main board. (2) Disconnect the wire from connector CN702 on the speakerboard and remove the band attaching the wire to the mainboard.(3) Disconnect the wire from the connector CN214 on powertransformer board.(4) Remove the two screws G attaching the front panel as-sembly on the bottom of the body.(5) Remove the two joints d and e on the lower part of thesides using a screwdriver, and remove the front panel as-sembly toward the front.Fig.14Fig.15Fig.16Main boardCN870Speaker boardCN702Front panel assemblyCN315BanddCN316Power transformer boardCN214Front panel assemblyeGFront panel assembly