SERVICE MANUAL - Wiki Karat
Contents
1. E TC74HC14AF IC504 IC571 CMOS 1 Pin layout Block diagram Vcc 6A 6Y 5Y 4 4Y 12 11 hol 9 b E NJM311M 1 502 Comparator 1 Pin layout TOP VIEW O GND V INPUT OUTPUT INPUT BAL STROBE V gt BAL 5 L7 el s 1 7 SX DW303 VICTOR COMPANY OF JAPAN LIMITED AUDIO amp COMMUNICATION BUSINESS DIVISION PERSONAL amp MOBILE NETWORK BUSINESS UNIT 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan Printed in Japan No 21177 2002102. characteristics are identified in the Parts List of Service Manual Electrical components having such features are identified by shading on the schematics and by A on the Parts List in the Service Manual The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock fire or other hazards The leads in the products are routed and dressed with ties clamps tubings barriers and the like to be separated from live parts high temperature parts moving parts and or sharp edges for the prevention of electric shock and fire hazard When service is required the original lead routing and dress should be observed and it should be confirmed that they have been returned to normal after re assembling o Leakage current check Electrical shock hazard testing After re assembling the product always perform an isolation check on the exposed metal parts of the product antenna terminals knobs metal cabinet screw heads headphone jack control shafts etc to be sure the product is safe to operate without danger of electrical shock Do not use 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 current from each exposed metal parts of the cabinet particularly any exposed metal part having a return path to the chassis to a kn
3. JVE SERVICE MANUAL POWERED SUBWOOFER SX DW303 Area Suffix E Continental Europe Contents Safety precautions 1 2 Disassembly method 1 3 Description of major ICs 1 6 7 No 21177 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN LTD Oct 2002 SX DW303 Safety Precautions This design of this product contains special hardware and many circuits and components specially for safety purposes For continued protection no changes should be made to the original design unless authorized in writing by the manufacturer Replacement parts must be identical to those used in the original circuits Services should be performed by qualified personnel only Alterations of the design or circuitry of the product should not be made Any design alterations of the product should not be made Any design alterations or additions will void the manufacturer s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom 3 Many electrical and mechanical parts in the products have special safety related characteristics These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety
4. out the bracket a toward you 3 Remove the connection of the wire connector m Removing the amplifier assembly board See Fig 5 6 Prior to performing the following procedures remove the rear panel and the power cord 1 Remove the screw marked D that is fixing the bracket b 2 Remove the three screws marked E that are fixing the bracket c 3 Remove the wire connecter CN102 and CN503 4 Remove the connection of the connector CN951 and CN952 5 Pull out the amplifier assembly board toward you m Removing the power supply assembly bord See Fig 6 Prior to performing the following procedures remove the rear panel and remove the power cord 1 Remove the amplifier board assembly 2 Remove the six screws marked F attaching the power board assembly 3 Pull out the power supply board assembly toward you 14 Bracket c Fig 4 Fig 6 Bracket a Amplifier assembly board Power supply assembly board SX DW303 m Removing the Bottom plate See Fig 7 8 1 Remove the three sheets of the cushion sheet marked G 2 Remove the six screws marked H attaching the bottom plate 3 Remove the two screws marked attaching the bottom plate 4 Pull out the bottom plate toward you plate Bottom plate Fig 8 E Removing the woofer See Fig 9 Prior to performing the following procedures remove the bottom plate 1 Remove the four screws J attaching the woofer 2 P
5. own good earth ground Any leakage current must not exceed 0 5mA AC r m s Alternate check method Plug the AC line cord directly into the AC outlet Use an AC voltmeter having 1 000 ohms per volt or more sensitivity in the following manner Connect a 1 500 Q 10W resistor paralleled by a 0 15u F AC type capacitor between an exposed metal part and a known good earth ground VOLTMETER Measure the AC voltage across the resistor with the Having 1000 voltmeter ohms volts Move the resistor connection to each exposed metal part more sensitivity particularly any exposed metal part having a return path to the chassis and measure the AC voltage across the resistor Now reverse plug in the AC outlet and repeat each measurement Voltage measured any must not exceed 0 75 V OT r m s This corresponds to 0 5 mA r m s 15000 10W metal part 0 154F AC TYPE Place this Good earth ground Warning 1 This equipment has been designed and manufactured to meet international safety standards 2 It is the legal responsibility of the repairer to ensure that these safety standards are maintained 3 Repairs must be made in accordance with the relevant safety standards N CAUTION Burrs formed during molding may be left over on some parts of the chassis Therefore pay attention to such burrs in the case of preforming repair of this system 4 It is essential that safety critical components are re
6. placed by approved parts 5 If mains voltage selector is provided check setting for local voltage In regard with component parts appearing on the silk screen printed side parts side of the PWB diagrams the parts that are printed over with black such as the resistor diode amm and ICP or identified by the A mark nearby are critical for safety This regulation does not correspond to J and C version SX DW303 Disassembly method B Removing the amplifier assembly See Fig 1 2 1 Remove the eleven screws A attaching the amplifier assembly 2 Remove the amplifier assembly to the front from the cabinet 3 Remove the connection of the wire connector at the back side of the amplifier assembly 4 Remove the connection of the speaker wire from the speaker terminal at the back side of the amplifier Cabinet Amplifier assembly Assembly A Fig 1 Cabinet Amplifier Assembly Speaker Wire connecter terminal Fig 2 mRemoving the rear panel See Fig 3 Amplifier Assembly Volume nob Frequency nob Prior to performing the following procedures remove the amplifier assembly 1 Remove the volume nob amp frequency nob 2 Remove the seven screws B attaching the rear panel Fig 3 3 Rear panel SX DW303 m Removing the power See Fig 4 5 Prior to performing the following procedures remove the rear panel 1 Remove the two screw marked C attaching the bracket a 2 Pull
7. ull out the woofer toward you Woofer Cabinet SX DW303 Description of major ICs BA15218F 1C101 102 103 104 501 Dual op amp 1 Pin layout Block diagram OUT1 IN1 1 1 E BU4584BF IC505 CMOS 1 Pin layout Block diagram Veb le Oe 15 O5 M 14 Ba tel 11 9 H O1 12 O2 Vss B 1821135 IC506 Gate driver 1 Pin layout VSS LIN SD HIN VDD 16 H5 hal 13 2 Mal hol 9 1 2 3 la 5 le z lel LO COM VCC VS VB HO 2 Block diagram i i Li T DETECT Ug E 1 LEVEL PULSE R e 9 HO Ba SHIT B gt ee Je VDD VCC FILTER S a im i HIN LEVEL i g _ SHIFT PULSE Vs 1 GEN 1 Hh SD tre e 6 Vcc UV p B gt o gt ccu DETECT y E RQ DELAY 1 in Vss COM 1 SX DW303 E TC74HCOOAF 1C503 CMOS 1 Pin layout Block diagram Kon or ilu MS Moy Oe 14 13 2 11 hol e 8 1 2 3 4 1A 1B 1Y 2A 2B 2Y GND
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