Jvc-SPDWF-10-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 Victor Company of Japan, LimitedNo.MB2512004/6POWERED SUB WOOFERMB25120046SP-DWF10TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-95 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10Area suffixJ - U.S.A.A - AustraliaE - Continental EuropeUS - SingaporeUF - ChinaUP - KoreaUT - TaiwanUX - Saudi ArabiaUJ - U.S.Military1-2 (No.MB251)SPECIFICATIONDesign and specifications are subject to change without notice.Type Powered Subwoofer Bass-reflex type (magnetically shielded type)Speaker 16.0 cm cone × 1 (6-5/16“)Frequency Range 32 Hz 200 HzImpedance 4 Input terminals INPUT (LOW-LEVEL)Power requirements AC 120 V , 60 HzOutput power of built-in amp 100 W (45 Hz, 4 , 10 % THD)Power Handling Capacity 25 WDimensions (W × H × D) 185 mm × 374 mm × 345 mm (7-5/16“ × 14-3/4“ × 13-5/8“)Mass 8.86 kg (19.6 lbs)(No.MB251)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.MB251)1.5 Importance administering point on the safetyCaution: For continued protection against risk of fire,replace only with same type 3 A/125 V for F901. This symbol specifies the type of fast operating fuse.Precaution: Pour la protection continue contre lesrisques d'incendie, remplacer uniquement par lememe type: fusible 3 A/125 V pour les F901. Ce symbole specifie le type de fusible a action rapide. Power switch boardF9001(No.MB251)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB251)SECTION 3DISASSEMBLY3.1 Removing the Amplifier assembly (See Figs.1 and 2)(1) From the back side of the main body, remove the elevenscrews A attaching the amplifier assembly. (See Fig.1.)(2) Take out the amplifier assembly from the main body.(3) Disconnect the wire connector from the back side of theamplifier assembly. (See Fig. 2.)(4) Disconnect the speaker wire from the speaker terminal.(See Fig.2.)3.2 Removing the back panel (See Figs.1 to 3)(1) From the back side of the main body, remove the elevenscrews A attaching the amplifier assembly. (See Fig.1.)Reference:Remove the amplifier assembly from the main body asrequired. (See Fig.2.)(2) Remove the five screws B attaching the back panel. (SeeFig.3.)Fig.1Fig.2Fig.3AAAAmplifier assemblyAAAmplifier assemblySpeaker terminalWire connectorBB(No.MB251)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 screws C attaching the bracket a. (SeeFig.4.)(2) Pull out the bracket a toward you.(3) Disconnect the power cord from the connector CN901 onthe power switch board. (See Fig.5.)3.4 Removing the amplifier board assembly (Amp board,volume board, switch board) (See Figs.5 and 6) Prior to performing the following procedures, remove the backpanel and the power cord. Remove the amplifier assembly from the main body as re-quired. (See Figs.1 and 2.)(1) Remove the three screws D attaching the bracket b. (SeeFig 5.)(2) Disconnect the wire from the connectors CN102 andCN503 on the amp board. (See Fig.5.)(3) Remove the amplifier board assembly from the connectorsCN951 and CN952 on the regulator board. (See Fig.6.)(4) Take out the amplifier board assembly.3.5 Removing the power supply board assembly (Regula-tor board, power switch board) (See Fig.6) Prior to performing the following procedures, remove the backpanel, power cord and amplifier board assembly. Remove the amplifier assembly from the main body as re-quired. (See Figs.1 and 2.)(1) Remove the screw E attaching the bracket c. (See Fig.6.)(2) Remove the two screws F and four screws G attaching theregulator board.(3) Take out the power supply board assembly.Fig.4Fig.5Fig.6Bracket aPower cordCCSwitch boardBracket bAmp boardVolume boardCN901CN503CN102DDPower switch boardRegulator boardPower switch boardBracket cCN951CN952GGEF1-8 (No.MB251)3.6 Removing the net assembly (See Fig 7)(1) From side of the main body, insert the tip of the flat-bladedscrewdriver or similar tool into the space between the mainbody and net assembly, and lift the net assembly little bylittle to remove. (See Fig 7)Note:To prevent damaging the net assembly and main body, insertcushioning plates etc. and below the tip of the flat-bladedscrewdriver or similar tool.From right side of the main body, release the eight joints d, andtake out the net assembly from the main body. (See Fig 7)Fig.73.7 Removing the speaker. (See Fig 8 and Fig 9) Prior to performing the following procedures, remove the netassembly.(1) Remove the six screws H attaching the speaker. (Fig 8)(2) Take out the speaker from the main body.(3) Disconnect the wires from the terminal of the speaker. (SeeFig 9)Fig.8Fig.9Net assemblyFlat-bladedscrewdriver,etc.Cushioningplate,etc.Main bodyHHJoint d (eight joints)SpeakerTerminalMain body(No.MB251)1-9SECTION 4ADJUSTMENTThis service manual does not describe ADJUSTMENT.1-10 (No.MB251)SECTION 5TROUBLESHOOTINGThis service manual does not describe TROUBLESHOOTING.