JVC-UXG4-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4292005/7MICRO COMPONENT SYSTEMMB42920057UX-G3, UX-G4Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-165TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19CA-UXG3SP-UXG3SP-UXG3CA-UXG4SP-UXG4SP-UXG4Area suffixUS - SingaporeUB - Hong KongUP - KoreaUT - TaiwanUW - Brazil,Mexico,PeruUY - ArgentinaUX-G3Area suffixUX-G4A - AustraliaUS - SingaporeUB - Hong KongUT - Ta

5、iwanUW - Brazil,Mexico,PeruRadioFans.CN 收音机爱 好者资料库1-2 (No.MB429)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section Output Power25 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion (IEC268-3).Audio input sensitiv

6、ity/Impedance (at 1 kHz) AUX: 500 mV/50 kSpeakers Impedance4 - 16 TunerFM tuning range50 kHz intervals87.50 MHz-108.00 MHz100 kHz intervals87.5 MHz-108.0 MHzAM tuning range9 kHz intervals531 kHz-1 710 kHz10 kHz intervals530 kHz-1 710 kHzCD playerDynamic range85 dBSignal-to-noise ratio85 dBWow and fl

7、utterImmeasurableCassette deckWow and flutter100 Hz - 10 000 HzWow and flutter0.35% (WRMS)GeneralPower requirementAC 110 V-127 V / AC 220 V-240 V (adjustable with the voltage selec-tor), 50Hz / 60HzPower consumption52 W (at operation)3.0 W (on standby)Dimensions (W/H/D) (approx.)152 mm 233 mm 331 mm

8、Mass (approx.)4.7 kgSpeaker Section TypeFull range, bass-reflex typeSpeakers10 cm cone 1Power handling capacity25 WImpedance4 Frequency range100 Hz - 15 kHzDimensions (W/H/D) (approx.)152 mm 233 mm 188 mmMass (approx.)1.8 kg eachRadioFans.CN 收音机爱 好者资料库(No.MB429)1-3SECTION 1PRECAUTION1.1Safety Precau

9、tions(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 i

10、n 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 fu

11、rther 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 affo

12、rded 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

13、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 product

14、s 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 i

15、t 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

16、 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 cabin

17、et, 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

18、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 met

19、al 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

20、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 ap

21、proved 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 wit

22、h 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

23、 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.MB429)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis servic

24、e manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB429)1-5SECTION 3DISASSEMBLY3.1Main body3.1.1Removing the front panel assembly (See Fig.1 to 6)(1) From the back of the body, remove the two screws A, thetwo screws B and the two screws D attaching the front pan-el assembly.(2) Remove the

25、 six screws E on both sides of the body.(3) Remove the screw F on the bottom of the body.(4) Move the front panel assembly in the direction of the arrowand remove. Disconnect the wire from connector CN102,CN402, CON801 on the main board.Caution:When reassembling the front panel assembly, fit the rig

26、ht andleft joints a to the notch.Fig.1Fig.2CD mechanism assemblyRear cover assemblyBADFront panelh assemblyCD mechanism assemblyRear cover assemblyE1-6 (No.MB429)Fig.3Fig.4Fig.5Fig.6Front panelh assemblyCD mechanism assemblyRear panel assemblyEFront panel assemblyRear panel assemblyFCD mechanism ass

27、emblyFront panel assemblyRear cover assemblyJoint aCD mechanism assemblyFront panel assemblyMain boardRear cover assemblyCN102CN402CON801(No.MB429)1-73.1.2Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the frontpanel assembly.(1) Disconnect the wire from a

28、ll connectors on the main board.(2) Disconnect the wire from the two connectors on the cas-sette mechanism assembly.(3) Release the two bands attaching the wire to the mainboard.(4) Remove the two screws G from the front panel assembly.Release the joint b.Fig.7Fig.8CD mechanism assemblyCD mechanism

29、assemblyFront panel assemblyCN203CN481Main boardCN303CN602CN301CN401CN102CN603CN103Main boardBandCD mechanism assemblyFront panel assemblyJoint bG1-8 (No.MB429)3.1.3Removing the CD mechanism assembly (See Fig.9, 10) Prior to performing the following procedure, remove the frontpanel assembly and the

30、main board.(1) Remove the three bands attaching the wire.(2) Disconnect the connector from the CD door switch. Discon-nect the wire from connector CN603 and CN606 on the CDmechanism board.(3) Disconnect the wire soldered on the CD mechanism board.(4) Remove the three screws H attaching the CD mechan

31、ismassembly.(5) Release the joints d to remove the CD mechanism assem-bly from the front panel assembly.Fig.9Fig.10CD mechanism assemblyCD door switchCD mechanism boardFront panel assemblyCN603CN606BandBandBandHHHCD mechanism assemblyFront panel assemblyJoint dJoint dCN603,CN606bandwire(No.MB429)1-9

32、3.1.4Removing the CD mechanism assembly (See Fig.11 to 13) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanism as-sembly.Caution:Before disconnecting the card wire from connector CN601 onthe CD mechanism board and from CD pickup board, sol

33、derthe short-circuit point on the CD pickup board. If you do not fol-low this instruction, the pickup may be damaged.(1) Disconnect the wire from connector on the CD motorboard.(2) Remove the four screws J attaching the CD mechanismboard.(3) Move the CD mechanism board temporarily as shown inFig.12.

34、(4) Remove the screw K attaching the wire to the CD mecha-nism.(5) Solder the short-circuit point on the CD pickup board.(6) Disconnect the card wire from connector CN601 on the CDmechanism board.Caution:Make sure to unsolder the short-circuit point after reconnectingthe card wire to the CD pickup b

35、oard and to connector CN601on the CD mechanism board.Fig.11Fig.12Fig.13CD mechanism assemblyCD mechanism boardCN601WireJJCD mechanism assemblyCD motor boardCD mechanism boardwire Cord wireCN601Short-circuit pointKShort-circuit pointCard wireUnsolderCD pickup board1-10 (No.MB429)3.1.5Removing the CD

36、mechanism (See Fig.14) Prior to performing the following procedure, remove the frontpanel assembly, the main board, the CD mechanism assemblyand the CD mechanism board.(1) Remove the four screws M attaching the CD mechanism.Fig.143.1.6Removing the headphone board/ AUX board (See Fig.15) Prior to per

37、forming the following procedure, remove the frontpanel assembly, the main board and the CD mechanism as-sembly.(1) Remove the screw N attaching the headphone board.(2) Remove the screw P attaching the AUX board.Fig.15CD mechanism assemblyCD mechanism MMFront panel assemblyAUX board Head phones board

38、 PN(No.MB429)1-113.1.7Remove the LCD board (See Fig.16, 17) Prior to performing the following procedure, remove the frontpanel assembly, the main board and the CD mechanism as-sembly.(1) From the front panel, pull out the volume knob and removethe nut and the washer.(2) Remove the twelve screws Q at

39、taching the LCD board.Fig.16Fig.17Front panel assemblyWasher Volume konbNutFront panel assemblyLCD boardQQQQ1-12 (No.MB429)3.1.8Removing the cassette mechanism assembly (See Fig.18, 19) Prior to performing the following procedure, remove the frontpanel assembly and the main board.(1) Push PUSH OPEN

40、on the front panel to open the cassettedoor.(2) Remove the screw R attaching the bracket of the cassettemechanism assembly.(3) Remove the two screws T and the two screws U attachingthe cassette mechanism assembly.Fig.18Fig.19Front panel assemblyCassette doorPUSH OPENCassette mechaanism assemblyFront

41、 panel assemblyBracketTTUUR(No.MB429)1-133.1.9Removing the heat sink/power board (See Fig.20 to 25) Prior to performing the following procedure, remove the frontpanel assembly.(1) Remove the four screws Y attaching the holder in the pow-er unit section.(2) Move the power unit section with the wire f

42、rom the rear cov-er temporarily. If necessary, release the band and unsolderthe wire on the power board.(3) Remove the four screws A and the two screws B attach-ing the holder.(4) Remove the three bands on the wire extending from thepower board (part e). Move the holder in the direction of thearrow

43、to detach from the joint f.(5) Remove the four screws D and screw E attaching the heatsink.Fig.20Fig.21Rear coverYYYYPower trnsfomer assemblyPower unit sectionRear coverPower unit section1-14 (No.MB429)Fig.22Fig.23Fig.24Fig.25HolderAAPower boarde Bande BandHeat sinkHolderBPower boarde BandHeat sinkB

44、Joint fDEHeat sinkPower boardDDHeat sinkPower board(No.MB429)1-153.1.10 Removing the power transformer assembly (See Fig.26, 27) Prior to performing the following procedure, remove the frontpanel assembly and the power unit section.(1) Remove the four screws F attaching the power transform-er assemb

45、ly. The bracket comes off at the bottom of therear cover.(2) Remove the screw G attaching the power cord folder.(3) Remove the two screws H attaching the AC connectboard.3.1.11 Removing the FM-ANT board (See Fig.26, 27) Prior to performing the following procedure, remove the frontpanel assembly and

46、the power unit section.(1) Remove the screw J on the rear cover assembly.(2) Unsolder the FM-ANT wire on the FM-ANT board.Fig.26Fig.27Rear coverFFPower trnsfomer assemblyRear coverFM-ANT boardGHHPower cord folderAC connect board J1-16 (No.MB429)SECTION 4ADJUSTMENT4.1Measuring instructions required f

47、or adjustment AM signal generator FM signal generator Inter medicate frequency sweep generator FM stereo signal generator Low-frequensy oscillator (osillation frequency 50 Hz - 20 kHz, 0 dB output with 600 impedance) Attenuator (600 impedance) Electoronic voltmeter Distortion meter Torque gauge (cas

48、sette for CTG-N) Wow & flutter meter Frequency counter meter4.2Test tape Playback tapeVT712 (tape speed, wow flutter)VT724 (reference level)VT703L (head azimuth)VT738 (frequency responce) Recording tapeAC225 (type I) Power supply voltageAC220V - 240V 50Hz4.3Measuring instruments Radio sectionFM : 1

49、kHz, 22.5kHz deviationFM stereo : 1 kHz, 67.5 kHz deviation, pilot signal 7.5 kHzAM : 1 kHz, 30% modulationReference output : 0 dB (1 V) 4 Headphone output : -10 dB (0.1V) 32 4.4Amplifier section Reference output : Speaker output 0 dB (1 V) / 4 Headphone output -10 dB (0.1 V) / 32 oh4.5CD section Te

50、st disc : CTS-1000 (JVC)TCD-731R (A-BEX)TCD-712R (A-BEX)TCD-785 (A-BEX)(No.MB429)1-174.6Cassette amplifier section4.7Tuner sectionItemMeasuring conditionCheck and adjustment procedureStandard valueAdjusting partHead azimuthadjustmentTape speedandwow/fluttercheck and adjustmentPB frequencyresponceche