JVC-EXD5-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4332005/7COMPACT COMPONENT SYSTEMMB43320057EX-D5Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-245TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35CA-EXD5SP-EXD1SP-EXD1Area suffixJ - U.S.A.C - CanadaRadioFans.CN 收音机爱 好者资料库1-2 (No.MB433)SPECIFICATIONDesigns and specifications are subject to change without notice.GeneralPower sourceAC 120 V , 60 HzPower consumption25 W (in operation)1.0 W (on standby)Weight3.0 kg (6.7 lbs)External dimensions (W H D)150 mm 152 mm 246 mm (5-15/16 in. 6 in. 9-11/16 in.)DVD playerPlayable discsDVD VIDEO, DVD AUDIO, VCD,SVCD, CD, CD-R/RW (CD, VCD,MP3, WMA, JPEG format),DVD-R/-RW (video format)Video output Color systemNTSCHorizontal resolution500 linesComposite 11.0 V (p-p)/75 , synchronization negativeS-video 1Y output: 1.0 V (p-p)/75 , synchronization negativeC output: 0.286 V (p-p)/75 Component 1Y output: 1.0 V (p-p)/75 PB/PR output: 0.7 V (p-p)/75 Audio output Analog sound output Speakers 2Output power: 18 W per channel, min. RMS, at 4 at 1 kHz with no more than 10% total harmonic distortion.Fitting impedance: 4 to 16 Headphones 111 mW/32 Fitting impedance: 16 to 1 kSubwoofer 1500 mVrms/10 kDigital sound outputOptical 1-21 dBm to -15 dBmAudio inputSound inputAUX 1400 mV/50 kUSB Wireless TransmissionThe USB wireless transmitter supplied with this System supports Direct Se-quence Spreading Spectrum (DSSS) using 2.4 GHz frequency band.TunerFM tunerReceiving frequency 87.5 MHz to 108.0 MHzAntenna75 - Unbalanced typeAM tunerReceiving frequency 530 kHz to 1 710 kHzAntennaExternal antenna jack (loop antenna)SpeakerTypeFull range1-way bass-reflex typeMagnetically shielded typeSpeaker8cm (3 3/16 inches) cone 1Frequency response55 to 20 000 HzPower handling capacity30 WImpedance4Sound pressure level80 dB/W mDimension (W H D)120 mm 151 mm 241 mm (4-3/4 in. 6 in. 9-1/2 in.)Weight1.8 kg (4.0 lbs) eachRadioFans.CN 收音机爱 好者资料库(No.MB433)1-3SECTION 1PRECAUTION1.1Safety 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 aLeakage 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 0.15F 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.). 1.2Warning(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.1.3CautionBurrs 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.1.4Critical 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.MB433)1.5Preventing 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 testers internal power source can easilydestroy the laser diode. 1.6Handling 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.1.7Attention 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 strapTraverse mechanism assemblyPickupShort land sectionCard wireConnector(No.MB433)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB433)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the side panel L and side panel R (See Figs.1 to 4)(1) From the back side of the main body, remove the fourscrews A attaching the side panels L/R. (See Fig.1.)(2) From the bottom side of the main body, remove the fourscrews B attaching the side panels L/R. (See Fig.2.)(3) From the both sides of the main body, release the joint a inthe direction of the arrow and remove the side panels L/Rtoward this side. (See Figs.3 and 4.)Fig.1Fig.2Fig.3Fig.4AASide panel RSide panel LBBSide panel RSide panel LSide panel RaaSide panel Laa(No.MB433)1-73.1.2Removing the top panel assembly (See Figs.5 to 6) Remove the side panels L/R.(1) From the front side of the main body, pull out the volumeknob assembly in the direction of the arrow. (See Fig.5.)(2) Remove the two screws C and remove the volume orna-ment. (See Fig.5.)(3) From the both sides of the main body, remove the twoscrews D, two screws E and screw F. (See Figs.5 and 6)Reference:When attaching the screw F, attach the earth wire with it.(See Fig.6.)(4) From the back side of the main body, remove the screw Gattaching the top panel assembly. (See Fig.6.)(5) From the both sides of the main body, release the joints band remove the joints c in the direction of the arrow. (SeeFigs.5 and 6.)(6) Disconnect the card wire from the connector CN427 on themicom board while lifting the top panel assembly. (SeeFig.5.)Fig.5Fig.6Top panel assemblyCN427cMicom boardVolume ornamentCCDEbVolume knob assemblyTop panel assemblycDEbTop panel assemblyGFEarth wire1-8 (No.MB433)3.1.3Removing the front panel assembly (See Figs.7 to 9) Remove the side panels L/R and top panel assembly.(1) From the bottom side of the main body, remove the twoscrews H attaching the front panel assembly. (See Fig.7.)(2) From the forward side of the micom board, disconnect thecard wire from the connector CN426. (See Fig.8.)(3) Disconnect the wire from the connector CN501 on the mi-com board. (See Fig.8.)(4) From the right side of the main body, remove the screw Jand remove the earth wire. (See Fig.8.)Reference: When attaching the screw J, attach the earth wire withit as before. (See Fig.8.) After attaching the earth wire, fix it with the spacer asbefore. (See Fig.8.)(5) From the bottom and both sides of the main body, releasethe joints (d, e) of the front panel assembly and remove thefront panel assembly in the direction of the arrow. (SeeFigs.7 to 9.)Fig.7Fig.8Fig.9Front panel assemblydHHFront panel assemblyCN426CN501eMicom boardEarth wireJSpacerFront panel assemblye(No.MB433)1-93.1.4Removing the tuner (See Figs.10 and 11) Remove the side panels L/R and top panel assembly.(1) From the back side of the main body, remove the twoscrews K attaching the tuner to the rear panel. (SeeFig.10.)(2) Disconnect the card wire from the connector CN1 on thetuner. (See Fig.11.)Fig.10Fig.11KKTunerTunerCN11-10 (No.MB433)3.1.5Removing the rear panel (See Fig.12) Remove the side panels L/R and top panel assembly.(1) From the back side of the main body, remove the tenscrews M and screw N attaching the rear panel.(2) From the top side of the main body, disconnect the earthwire from the rear panel in the direction of the arrow.(3) From the both sides of the main body, release the joints fand remove the rear panel.Fig.12MMNMRear panelffRear panelEarth wireM(No.MB433)1-113.1.6Removing the switching power supply (See Figs.13 and 14) Remove the side panels L/R, top panel assembly and rearpanel.(1) From the top side of the main body, disconnect the wirefrom the connector CN200 on the regulator board. (SeeFig.13.)(2) Take out the switching power supply in the direction of thearrow. (See Fig.14.)Fig.13Fig.14Regulator boardCN200Wire holderSwitching power supply1-12 (No.MB433)3.1.7Removing the digital amplifier board assembly (See Figs.15 and 16) Remove the side panels L/R, top panel assembly, rear paneland switching power supply.(1) From the top side of the main body, remove the screw P at-taching the digital amplifier board assembly. (See Fig.15.)(2) From the left side of the main body, disconnect the connec-tors (CN310, CN311, CN312) on the digital amplifier boardassembly from the regulator board. (See Fig.16.)(3) Release the joint g of the shield case B in the direction ofthe arrow and take out the digital amplifier board assemblyfrom the main body. (See Fig.16.)Fig.15Fig.16Digital amplifier board assemblyPDigital amplifier board assemblyShield case B CN312 CN311 CN310Regulator boardg(No.MB433)1-133.1.8Removing the digital amplifier board (See Figs.17 to 22) Remove the side panels L/R, top panel assembly, rear panel,switching power supply and digital amplifier board assembly.(1) From the forward side of the digital amplifier board assem-bly, remove the screw Q. (See Fig.17.)(2) From the top and bottom sides of the digital amplifier boardassembly, remove the three screws R. (See Figs.18 and19.)(3) Release the joints (h, j, k, m) and remove the shield caseB with the heat sink in the direction of the arrow. (SeeFigs.18 to 21.)(4) From the forward side of the digital amplifier board, removethe screw R attaching the heat sink. (See Fig.22.)(5) Remove