JVC-UXH100-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2482004/7MICRO COMPONENT SYSTEMMB24820047UX-H100TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC

2、 SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74ADJUSTMEN

3、T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-165TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17A

4、rea suffixA - AustraliaUS - SingaporeUT - TaiwanUW - Brazil,Mexico,PeruUJ - U.S.MilitaryRadioFans.CN 收音机爱 好者资料库1-2 (No.MB248)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier Section-CA-UXH100 Output Power10 W per channel, min. RMS, driven into 6 at 1 kHz,with no

5、more than 10% total harmonic distortion (IEC268-3)Speakers/Impedance6 - 16 TunerFM tuning rangeFM 100 kHz intervals 87.5 MHz-108.0 MHzFM 50 kHz intervals87.50 MHz-108.00 MHzAM tuning rangeAM 10 kHz intervals530 kHz-1 710 kHzAM 9 kHz intervals:531 kHz-1 710 kHzCD playerDynamic range85 dBSignal-to-noi

6、se ratio85 dBWow and flutterImmeasurableCassette deckFrequency response Normal (type I)100 Hz-10 000 HzWow and flutter0.35 % (WRMS)GeneralPower requirementAC 110V-127V/220V-240 V , adjustable with the voltageselector, 50 Hz/60 HzPower consumption38 W (at operation) 2 W (on standby)Dimensions (W/H/D)

7、 (approx.)144 mm 255 mm 277 mmMass (approx.)2.9 kgSpeaker Section-SP-UXH100 TypeFull range Bass-reflex typeSpeakers10 cm cone 1Power handling capacity10 WImpedance6 Frequency range100 Hz to 15 kHzDimensions (W/H/D) (approx.)130 mm 257 mm 151 mmMass (approx.)1.5 kg eachRadioFans.CN 收音机爱 好者资料库(No.MB24

8、8)1-3SECTION 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 authorized in writing by themanufacturer. Replacemen

9、t 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 vo

10、idthe 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 visu

11、al 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 su

12、ch 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, orot

13、her 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 ro

14、utingand 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 cabi

15、net, 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 aLeakage Current Tester, measure the leakage currentfr

16、om 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 havin

17、g, 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 ACvoltmeter. Move the resistor connection to each exposed

18、 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.). 1.2Warn

19、ing(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 safe

20、ty 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 the case of pre-forming repair of this system.1

21、.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 nearby are criticalfor safety. When replacing them,

22、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.MB248)1.5Preven

23、ting 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 repairs.1.5.1 Grounding to prevent damage by static e

24、lectricityStatic 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 by laying conductive material (such as a conduc

25、tive 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 quality during transport and before installation

26、, 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 pickup. The testers internal power source can easil

27、ydestroy 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. after replacing the optical pickup. For specific

28、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 subjected to strong force. (4) I t is not possib

29、le 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 flexible wire is disconnected from the connecto on th

30、e servo board. (If the flexiblewire is 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 flexible wire.1MConductive material(conductive sheet) or iron palate(caption)An

31、ti-static wrist strapSolderingFlexible cableCD changer unit(No.MB248)1-51.8Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts inside theLaser Uni

32、t. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The CD,MD and DVD player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are d

33、efeated. 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 performance of procedures other than those specified here in may result in hazardous radiation exposure.REPRODUCTION AND POSITI

34、ON OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena ole

35、t alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)!Please use enough caution not to see the beam directly or touch it in case of an a

36、djustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AVOID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suoja

37、lukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL1-6 (No.MB248)SECTION 2SPECIFIC SE

38、RVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB248)1-7SECTION 3DISASSEMBLY3.1Disassembly of the main blocks of the set3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure, remove the rearcover.(1) Replace the fuses inside.Cauti

39、on:Be sure to use fuses with the specified ratings.Fig.13.1.2Replacing the power IC (See Fig.2) Prior to performing the following procedure, remove the rearcover.(1) Remove the two screws A from the heat sink between thepower IC.(2) Remove the solder fixing the power IC.Fig.2Fuse (F901)800MAL 250VFu

40、se (F902)T315MAL 250VA1-8 (No.MB248)3.1.3Removing the rear cover (See Fig.3 and 4)(1) Remove the seven screws C that retain the rear cover fromthe back of the body.(2) Remove the eight screws D that retain the rear cover fromthe two sides of the body.(3) Remove the rear cover from the body by pullin

41、g it towardthe back.Caution:The FM terminal wire (inside) must be pulled out, while remov-ing the rear cover.Fig.3Fig.4Rear coverCCCDDD(No.MB248)1-93.1.4Removing the CD chassis assembly (See Fig.5 to 8) Prior to performing the following procedures, remove the rearcover.(1) Remove a screw E retaining

42、 the main board onto the CDchassis.(2) Disconnect the two FFC cables X1, X2 from the connectorsCN704, CN703 on the CD board.(3) Disengage the claws F on both sides of the body, whilemoving the CD chassis assembly downward and back-ward.(4) Before you take away the CD chassis assembly, you mustdiscon

43、nect the wire from the connector CN204 on the mainboard. (Fig.8)Caution:You must ensure that the two claws of the CD chassiss top Gare disengaged, while moving the CD chassis assembly.Fig.5Fig.6Fig.7Fig.8EFX1X2GCassette mechanism1-10 (No.MB248)3.1.5Removing the CD mechanism (See Fig.9 to 13) Prior t

44、o performing the following procedures, remove the rearcover. Also remove the CD chassis assembly.(1) Remove the three screws Y1 retaining the CD board.(2) Disconnect the FFC cable Y2 from the connector CN701.(3) Disconnect the two parallel wires Y3 from the connector.(4) Remove the four screws Y4 wi

45、th washers retaining the CDmechanism.Fig.9Fig.10Fig.11Fig.12Fig.13Y1Y2Y3Y3Y4(No.MB248)1-113.1.6Removing the bottom base assembly (See Fig.14 to 18) Prior to performing the following procedures, remove the rearcover. Also remove the CD chassis assembly.(1) Remove the two screws H retaining the front

46、panel assem-bly.(2) Disengage the wire Q that fix the cassette deck wire.(3) Disconnect the cassette head wire Z1 and the cassette mo-tor wire Z2 of power supply from the connectors CN202,CN203, and then disconnect the AUX IN connecting wireZ3 from the connector TP1.(4) Disengage the claws I on both

47、 sides of the front cabinet as-sembly and then move the bottom base assembly towardthe back.Caution:You must ensure that the 30 pin connector CN201 is discon-nected (See Fig.15).Fig.14Fig.15Fig.16Fig.17Fig.18QCN201HIFront panelCircuit boardZ1Z2Z31-12 (No.MB248)3.1.7Removing the main board (See Fig.1

48、9 and 20) Prior to performing the following procedures, remove the rearcover. Also remove the CD chassis assembly. Also remove the bottom base assembly.(1) Disengage the wire M and then disconnect the parallel wirefrom the connectors CN902 (See Fig.20).(2) Removing the screw N retaining the main boa

49、rd onto thebottom base.Fig.19Fig.203.1.8Replacing the 3-pin regulator (See Fig.21) Prior to performing the following procedures, remove the rearcover. Also remove the CD chassis assembly. Also remove the main board assembly.(1) Remove the two screws P retaining 3-pin regulator.(2) Remove the solder

50、fixing the 3-pin regulator Q216, .Fig.21NMain boardBottom baseMP(No.MB248)1-133.1.9Removing the cassette deck mechanism (See Fig.22 and 23) Prior to performing the following procedures, remove the rearcover. Also remove the CD chassis assembly. Also remove the bottom base assembly.(1) Remove the fou