JVC-HXGX7-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1612004/3COMPACT COMPONENT SYSTEMMB16120043HX-GX7TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-375TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41 Area suffixJ - U.S.A.C - Canada CA-HXGX7SP-HXGX7SP-HXGX7RadioFans.CN 收音机爱 好者资料库1-2 (No.MB161)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier section-CA-HXGX7Output PowerSUBWOOFERS180 W per channel, min. RMS, driven into 6 at 63 Hz with no more than 10 %totalharmonic distortion.MAIN SPEAKERS80 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10 %totalharmonic distortion.Audio input sensitivity/impedance (Measured at 1 kHz, with tape recording signal 300 mV)AUX300 mV/47 kSpeakers/impedanceSUBWOOFERS6 - 16 MAIN SPEAKERS 6 - 16 TunerFM tuning range87.5 MHz - 108.0 MHzAM tuning range530 kHz - 1 710 kHzCD playerCD capacity5 discsDynamic range87 dBSignal-to-noise ratio90 dBWow and flutterImmeasurableMP3 recording formatMPEG 1/2 Audio Layer 3Max. Bit rate320 kbpsCassette deckFrequency responseNormal (type I)50 Hz - 14 000 HzWow and flutter0.15 % (WRMS)GeneralPower requirementAC 120 V , 60 HzPower consumption245 W/310 VA (at operation) 26 W (on standby)Dimensions (approx.)205 mm 370 mm 432 mm (W/H/D) (8 1/8 in. 14 5/8 in. 17 1/0 16 in.)Mass (approx.)10.5 kg (23.2 lbs)Speaker section-SP-HXGX7Type3-Way 4-Speaker Bass-Reflex TypeSpeaker SystemsSubwoofer16 cm (6 5/16 in.) cone 1Woofer12 cm (4 3/4 in.) cone 2Tweeter5 cm (2 in.) cone 1Power handling capacity Subwoofer360 (180 + 180) WMain speaker160 (80 + 80) WImpedanceSubwoofer6 Main speaker6 Frequency rangeSubwoofer27 Hz - 1000 HzMain speaker70 Hz - 25 000 HzSound pressure levelSubwoofer78 dB/WmMain speaker88 dB/WmDimensions (approx.)227 mm 432 mm 376 mm (W/H/D) (8 15/16 in. 17 1/16 in. 14 13/16 in.)Mass (approx.)8 kg (17.7 lbs) eachRadioFans.CN 收音机爱 好者资料库(No.MB161)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.MB161)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 strapPickupFlexible boardShort roundCard wire(No.MB161)1-51.8Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with same type 6.3 A/125 V forF001, 8 A/125 V for F101 and F102, 3.15 A/125 Vfor F104.This symbol specifies type of fast operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F001 comme le meme typeque 6,3 A/125 V, 8 A/125 V pour F101 et F102, et3.15 A/125 V pour F104.Ce sont des fusibles suretes qui functionnes rapide.8A-125VF1028A-125VF1013.15A-125VF1046.3A-125VF0011-6 (No.MB161)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB161)1-7SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the metal cover (See Figs.1 to 3)(1) From the back side of the main body, remove the sixscrews A attaching the metal cover. (See Fig.1.)(2) From the both sides of the main body, remove the twoscrews B attaching the metal cover. (See Figs.2 and 3.)(3) Remove the metal cover from the main body while liftingthe rear section of the metal cover in the direction of the ar-row. (See Figs.2 and 3.)Fig.1Fig.2Fig.3Metal coverAAAMetal coverBMetal coverB1-8 (No.MB161)3.1.2Removing the front panel assembly (See Figs.4 to 7) Prior to performing the following procedures, remove the metalcover.(1) From the right side of the main body, disconnect the cardwires from the connectors (CN43, CN44, CN802, CN803)on the main board. (See Fig.4.)(2) Disconnect the earth wire from the chassis base. (SeeFig.4.)(3) From the top side of the main body, disconnect the parallelwires from the connectors (CN201, CN205) on the bridgeboard. (See Fig.5.)Reference:When reassembling, pass the parallel wire through thehole a on the plastic chassis before connecting the par-allel wire to the connector CN201 on the bridge board.(See Fig.5.)(4) Disconnect the earth wire from the chassis base. (SeeFig.6.)(5) From the both sides of the main body, remove the twoscrews C attaching the front panel assembly. (See Figs.4and 6.)(6) From the bottom side of the main body, remove the threescrews D attaching the front panel assembly. (See Fig.7.)(7) Release the joints b of the front panel assembly from thechassis base and remove the front panel assembly in thedirection of the arrow. (See Figs.4,6 and 7.)Fig.4Fig.5Fig.6Fig.7Front panel assemblyCard wiresCard wiresEarth wireChassis baseMain boardCN803CN802CN43CN44bCParallel wireParallel wirePlastic chassisBridge boardCN201CN205aParallel wireFront panel assemblyEarth wireChassis basebCFront panel assemblyChassis basebbD(No.MB161)1-93.1.3Removing the tuner (See Figs.8 and 9.) Prior to performing the following procedures, remove the metalcover.(1) From the right side of the main body, disconnect the cardwire from the connector CN560 on the main board. (SeeFig.8.)(2) From the back side of the main body, remove the twoscrews E attaching the tuner to the rear panel. (See Fig.9.)Fig.8Fig.9Card wiresTunerMain boardCN560Rear panelE1-10 (No.MB161)3.1.4Removing the rear panel (See Figs.10 to 12) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the wirefrom the connector CN202 on the bridge board. (SeeFig.10.)(2) From the back side of the main body, remove the screw Fand two screws G attaching the rear cover. (See Fig.11.)(3) Release the sections d and remove the rear cover. (SeeFig.11.)(4) Remove the screw H and eleven screws J attaching therear panel. (See Fig.12.)(5) From the both sides of the main body, release the joints eattaching the rear panel to the chassis base and removethe rear panel with the fan. (See Fig.12.)3.1.5Removing the fan (See Figs.10 to 12) Prior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the wirefrom the connector CN202 on the bridge board. (SeeFig.10.)(2) From the back side of the main body, remove the screw Fand two screws G attaching the rear cover. (See Fig.11.)(3) Remove the two screws K attaching the fan. (See Fig.12.)(4) Take out the fan from the main body.Fig.10Fig.11Fig.12Bridge boardCN202Rear coverdddFGRear panelFaneeJJJJJHKK(No.MB161)1-113.1.6Removing the main board (See Figs.13 and 14) Prior to performing the following procedures, remove the metalcover and rear panel.Reference:Remove the tuner as required.(1) From the right side of the main body, disconnect the cardwires from the connectors (CN43, CN44, CN661, CN802,CN803) on the main board. (See Fig.13.)(2) Remove the two screws L attaching the main board. (SeeFig.14.)(3) Disconnect the connector CN217 on the main board to-ward this side and disconnect the connector CN501 on themain board in the direction of the arrow. (See Fig.14.)Reference: When attaching the main board, insert the sections f of thebridge board in the hole of the main board. (See Fig.14.) Insert the section g of the main board in the hole of the chas-sis base before attaching the screws L.Fig.13Fig.14Card wiresCard wiresMain boardCN803CN802CN43CN44CN661Chassis baseMain boardMain boardCN501CN217ffgLLBridge board1-12 (No.MB161)3.1.7Removing the main amplifier board/subwoofer amplifier boards (See Figs.15 to 17) Prior to performing the following procedures, remove the metalcover, rear panel and main board.(1) From the top side of the main body, disconnect the wiresfrom the connector (CN206, CN208) on the bridge board.(See Fig.15.)(2) From the back side of the main body, disconn