JVC-UXG300-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2008 Victor Company of Japan, LimitedNo.MB6652008/9MICRO COMPONENT SYSTEMMB66520089 SERVICE MANUALUX-G300B, UX-G300E, UX-G300EN, UX-G300EV, UX-G303E, UX-G303EN, UX-G303EV, UX-G305E, UX-G305EN, UX-G305EV, UX-G300A, UX-G300US, UX-G300UF, UX-G300UT, UX-G300UW, UX-G300UG, UX-G300

2、UN, UX-G305UTCOPYRIGHT 2008 Victor Company of Japan, LimitedLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-205TROUBLESHOOTING . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21UX-G300EVUX-G303EVUX-G305EVSP-UXG300SP-UXG300CA-UXG300RadioFans.CN 收音机爱 好者资料库1-2 (No.MB665)SPECIFICATIONUX-G300 B/E/EN/EVUX-G303 E/EN/EVUX-G305 E/EN/EVSpecifications and appearance a

6、re subject to change without prior notice.Amplifier sectionOUTPUT POWER 60 W (30 W + 30 W) at 4 (10% THD)Speakers/Impedance 4 - 16 Audio input AUDIO IN 500 mV/47 k (at “IN LVL1”)250 mV/47 k (at “IN LVL2”)125 mV/47 k (at “IN LVL3”)Digital input USB MEMORYTuner sectionFM tuning range 87.50 MHz - 108.0

7、0 MHzAM (MW) tuning range 522 kHz - 1 629 kHzCD player sectionDynamic range 88 dBSignal-to-noise ratio 85 dBWow and flutter ImmeasurableUSB storageUSB specification Compatible with USB 2.0 Full SpeedCompatible device Mass storage classCompatible file system FAT16,FAT32Bus power supply Max. 500 mASpe

8、akersSpeaker units 10 cm cone x 1Impedance 4 Dimensions (approx.) 160 mm x 250 mm x 150 mm (W/H/D)Mass (approx.) 1.6 kg eachGeneralPower requirements AC 230,50 HzPower supply to USB mass storage class device DC 5 V =500 mAPower consumption 20 W (power on)6.5 W (standby mode)1 W or less (Save Mode)Di

9、mensions (W x H x D) 165 mm x 251 mm x 269 mmMass 2.6 kgRadioFans.CN 收音机爱 好者资料库(No.MB665)1-3UX-G300 US/UN/UB/UG/A/UW/UF/UTUX-G305UTSpecifications and appearance are subject to change without prior notice.Amplifier sectionOUTPUT POWER60 W (30 W + 30 W) at 4 (10% THD)Speakers/Impedance4 - 16 Audio inp

10、ut AUDIO IN500 mV/47 k (at “IN LVL1”)250 mV/47 k (at “IN LVL2”)125 mV/47 k (at “IN LVL3”)Digital inputUSB MEMORYTuner sectionFM tuning range87.50 MHz - 108.00 MHzAM (MW) tuning range530 kHz - 1 710 kHz (in 10 kHz spacing)531 kHz - 1 710 kHz (in 9 kHz spacing)CD player sectionDynamic range88 dBSignal

11、-to-noise ratio85 dBWow and flutterImmeasurableUSB storageUSB specificationCompatible with USB 2.0 Full SpeedCompatible deviceMass storage classCompatible file systemFAT16, FAT32Bus power supplyMax. 500 mASpeakersSpeaker units10 cm cone x 1Impedance4 Dimensions (approx.)160 mm x 250 mm x 150 mm (W/H

12、/D)Mass (approx.)1.6 kg eachGeneralPower requirementsAC 110 V - AC 240 V , 50/60 HzAC 240 V , 50 Hz (only Australia)AC 220 V , 50 Hz (only Hong Kong)Power supply to USB mass storage class deviceDC 5 V =500 mAPower consumption20 W (power on)6.5 W (standby mode)1 W or less (Save Mode)Dimensions (W x H

13、 x D)165 mm x 251 mm x 269 mmMass2.6 kg1-4 (No.MB665)SECTION 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 auth

14、orized 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 m

15、ade. 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

16、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

17、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 Lis

18、t 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

19、. 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 th

20、e 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 aLeaka

21、ge 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 direc

22、tly 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 ACvoltmet

23、er. 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.)

24、. 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 releva

25、ntsafety 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

26、 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 near

27、by 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 sensitivi

28、ty)1500 10W0.15 F AC TYPE(No.MB665)1-51.5Preventing 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 repair

29、s.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

30、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 q

31、uality 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 pick

32、up. 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. af

33、ter 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 s

34、ubjected 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 card w

35、ire is disconnected from the connecto on the servo board. (If the card wireis 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 card wire.1MConductive material(conducti

36、ve sheet) or iron palate(caption)Anti-static wrist strapSolder short land section1-6 (No.MB665)1.8Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class

37、1M laser radiation when open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.4.CAUTION : This laser product uses visible and/or invisible laser radiation and is equipped wi

38、th safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or p

39、erformance of procedures other than those specified here in may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABELS and PRINT!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck. WARNING LABEL and PRINT(No.MB665)1-7SEC

40、TION 2SPECIFIC SERVICE INSTRUCTIONSNew CD mechanism was added.In a model using new CD mechanism for, it stick a blue label for identification on the back side.When it repair the CD mechanism of an article sticking this label on, please use a parts list of FMU-VK1-2M.SECTION 3DISASSEMBLY3.1Main body

41、(Used figure are UX-G300E)3.1.1Removing the Metal Cover (See Fig.1, 2)(1) Remove the seven screws A attaching the Metal cover.(See Fig.1)(2) Remove the two screws B attaching the both side of theMetal cover. (See Fig.2)Fig.1Fig.2A label for identificationAAB1-8 (No.MB665)3.1.2Removing the Tuner pack

42、 (See Fig.3, 4)(1) Disconnect the card wire from Tuner pack connected toconnector CN306 of the Micom board. (See Fig.3)(2) Remove the two screws C attaching the Tuner pack. (SeeFig.4)Fig.3Fig.43.1.3Removing the Rear panel (See Fig.5)(1) Remove the five screws D attaching the Rear panel.Fig.53.1.4Rem

43、oving the Amp board (See Fig.6)(1) Disconnect the connector wire from Power board connect-ed to connector CN640 of the Amp board.(2) Disconnect the card wire from Amp board connected toconnector CN520 of the Micom board.(3) Remove the one screw E attaching the Amp board.Fig.6CN306CDECN520CN640(No.MB

44、665)1-93.1.5Removing the CD mechanism (See Fig.7 to 9)(1) Disconnect the card wire from CD mechanism connectedto connector CN360 and CN362 of the Connection board.(See Fig.7)(2) Disconnect the card wire from CD mechanism connectedto connector CN205 of the Power board. (See Fig.7)(3) Remove the two s

45、crews F attaching the CD mechanism.(See Fig.8)(4) Disconnect the connector wire from USB jack board con-nected to connector CN802 of the CD servo control board.(See Fig.9)Fig.7Fig.8Fig.9CN360CN362CN205FCN8021-10 (No.MB665)3.1.6Removing the Mecha chassis (See Fig.10, 11)(1) Remove the two screws G at

46、taching the both side of theFront panel. (See Fig.10)(2) Disconnect the card wire from Connection board connect-ed to connector CN311 of the Micom board. (See Fig.11)Fig.10Fig.11GCN311(No.MB665)1-113.1.7Removing the Front panel (See Fig.12 to 14)(1) Disconnect the card wire from FL board connected t

47、o con-nector CN304 of the Micom board. (See Fig.12)(2) Disconnect the card wire from Volume board connected toconnector CN303 of the Micom board. (see Fig.12)(3) Remove the two screws H attaching the Front panel. (SeeFig.13)(4) Disengage two hooks a engaged both side of the Frontpanel. (See Fig.14)(

48、5) Disengage one hook b engaged bottom side of the Frontpanel. (See Fig.13)Fig.12Fig.13Fig.14CN304CN303hook bHHhook a1-12 (No.MB665)3.1.8Removing the Micom board (See Fig.15, 16)(1) Remove the two screws J attaching the Micom board. (SeeFig.15)(2) Disconnect the flat cable wire from Micom board conn

49、ectedto connector CN201 and CN203 of the Power board. (SeeFig.16)(3) Disconnect the board to board connector connected toconnector CN204 of the Power board. (See Fig.16)(4) Disconnect the board to board connector connected toconnector CN803 of the USB jack board. (See Fig.16)Fig.15Fig.163.1.9Removin

50、g the USB jack board (See Fig.17)(1) Remove the three screws K attaching the USB jack board.3.1.10 Removing the Power board (See Fig.17)(1) Disconnect the power cord connected to connector CN200of the Power board.(2) Remove the four screws L attaching the Power board.Fig.17JCN204CN803CN203CN201CN200