Jvc-SXDW-303-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB0822003/11POWERED SUBWOOFERMB082200311SX-DW303TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-95 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10J - U.S.A.Area Suffixwww.freeservicemanuals.info Absolutly Free manuals1-2 (No.MB082)SPECIFICATIONType Powered subwooferBass-reflex type, (magnetically shielded type)Speaker unit 16.0 cm (6 5/16 in.) cone ( × 1)Frequency range 30 Hz to 200 HzInput impedance 50 k (LOW-LEVEL)470 (HIGH-LEVEL)Input terminals INPUT 1 (LOW-LEVEL)INPUT 2 (HIGH-LEVEL)Power requirements AC 120 V , 60 HzOutput power of built-in amp 100 W (45 Hz, 4 , 10 % THD)Power consumption 25 WDimensions (W × H × D) 217 mm × 393 mm × 376 mm (8 9/16 in. × 15 1/2 in. × 14 13/16 in.)Mass 9.2 kg (20.3 lbs)www.freeservicemanuals.info Absolutly Free manuals(No.MB082)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 TYPEwww.freeservicemanuals.info Absolutly Free manuals1-4 (No.MB082)1.5 Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with same type 3A/250V forF9001.This symbol specifies type of fast operating fuse.Power switch board (Forward side)F9001www.freeservicemanuals.info Absolutly Free manuals(No.MB082)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.www.freeservicemanuals.info Absolutly Free manuals1-6 (No.MB082)SECTION 3DISASSEMBLY3.1 Removing the amplifier assembly (See Figs.1 and 2)(1) Remove the eleven screws A attaching the amplifier as-sembly. (See Fig.1.)(2) Remove the amplifier assembly from the service cabinet.(See Fig.2.)(3) From the back side of the amplifier assembly, disconnectthe wire from the wire connector. (See Fig.2.)(4) Disconnect the speaker wire from the speaker terminal.(See Fig.2.)Fig.1Fig.23.2 Removing the back panel (See Fig.3) Prior to performing the following procedures, remove the am-plifier assembly.(1) Pull out the volume knob and frequency knob.(2) Remove the seven screws B attaching the back panel.Fig.3Amplifier assemblyService cabinetAAAWire connecterSpeaker terminalAmplifier assemblyService cabinetFrequency knobVolume knobBBAmplifier assemblyBack panelwww.freeservicemanuals.info Absolutly Free manuals(No.MB082)1-73.3 Removing the power cord (See Figs.4 and 5) Prior to performing the following procedures, remove the backpanel.(1) Remove the two screw C attaching the bracket (CORD).(See Fig.4.)(2) Take out the bracket (CORD) toward this side.(3) Disconnect the power cord from the connector CN901.(See Fig.5.)3.4 Removing the amplifier board assembly (See Figs.5 and 6) Prior to performing the following procedures, remove the backpanel and power cord.(1) Remove the screw D attaching the bracket (SW). (SeeFig.5.)(2) Remove the three screws E attaching the bracket (KNOB).(See Fig.5.)(3) Disconnect the wires from the connecters CN102 andCN503. (See Fig.5.)(4) Disconnect the amplifier board assembly from the connec-tors CN951 and CN952 on the regulator board. (See Fig.6.)(5) Take out the amplifier board assembly from the amplifierassembly.3.5 Removing the regulator board (See Fig.6) Prior to performing the following procedures, remove the backpanel, power cord and amplifier board assembly.(1) Remove the two screws F and four screws G attaching theregulator board.(2) Take out the regulator board from the cover.Fig.4Fig.5Fig.6Bracket (CORD)CPower cordCAmplifier board assemblyECN901EDCN503CN102Bracket (SW)Bracket (KNOB)CN951CN952FFRegulator boardGGCoverGwww.freeservicemanuals.info Absolutly Free manuals1-8 (No.MB082)3.6 Removing the stand (See Figs.7 and 8)(1) Remove the foot spacers. (See Fig.7.)(2) Remove the eight screws H attaching the stand. (SeeFig.8.)(3) Remove the stand toward this side.Fig.7Fig.83.7 Removing the speaker unit (See Fig.9) Prior to performing the following procedures, remove thestand.(1) Remove the four screws J attaching the speaker unit.(2) Take out the speaker unit from the service cabinet towardthis side.Fig.9StandFoot spacerFoot spacersHHHStandHHSpeaker unitService cabinetJJwww.freeservicemanuals.info Absolutly Free manuals(No.MB082)1-9SECTION 4ADJUSTMENTThis service manual does not describe ADJUSTMENT.www.freeservicemanuals.info Absolutly Free manuals1-10 (No.MB082)SECTION 5TROUBLESHOOTINGThis service manual does not describe TROUBLESHOOTING.www.freeservicemanuals.info Absolutly Free manuals