Jvc-UXQX-3-AA-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2006 Victor Company of Japan, LimitedNo.MB5742006/9MICRO COMPONENT SYSTEMMB57420069UX-QX3WA,UX-QX3AALead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-63 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-245 TROUBLESHOOTING . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27CA-UXQX3W SP-UXQX1WCA-UXQX3A SP-UXQX1ASP-UXQX1WSP-UXQX1A1-2 (No.MB574)SPECIFICATIONCD receiver section (CA-UXQX3W/CA-UXQX3A)Speaker section (SP-UXQX1W/SP-UXQX1A)Micro component system (UX-QX3W/UX-Q

5、X3A)Design and specifications are subject to change without notice.Amplifier Output power 20 W 2ch (THD 10%/4 )Input terminal LINE IN 1 LEVEL1 : 500 mV/47 kLEVEL2 : 250 mV/47 kLEVEL3 : 125 mV/47 kOutput terminals Speaker 2 20 W/4 Impedance : 4 - 16 Headphones ( 1) 25 mW/32 Impedance : 16 - 1 kLINE O

6、UT 1 1 V/47 kTuner Tuner Frequency FM 87.50 MHz - 108.00 MHzAM 531 kHz - 1 710 kHz (9 kHz spacing)530 kHz - 1 710 kHz (10 kHz spacing)General Power requirement AC 240 V , 50 HzPower consumption 55 W (at operation)8 W (Touch illumination ON/QP Link ON)1.1 W (Touch illumination OFF/QP Link OFF)Dimensi

7、ons 165 mm (W) 204 mm (H) 339.5 mm (D)Mass (approx.) 4.1 kgCD player Playable discs Audio CDs and MP3System 2-way bass reflex typeSpeakers Woofer 11 cm cone speaker 1Tweeter 4 cm cone speaker 1Power handling capacity 20 WImpedance 4 Frequency range 56 Hz - 40 kHzSound pressure level 84 dB/WmDimensio

8、ns 135 mm (W) 200.5 mm (H) 215 mm (D)Mass (approx.) 1.9 kg eachDimensions 435 mm (W) 204 mm (H) 339.5 mm (D)Mass (approx.) 7.9 kg(No.MB574)1-3SECTION 1PRECAUTION1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos

9、-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 circui

10、try 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 electric

11、al 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

12、 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 t

13、he 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

14、 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 rea

15、ssembling 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 tran

16、sformer 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 c

17、ur-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 0.15F AC-type capacitor between anexposed metal part a

18、nd 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

19、 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 thatt

20、hese 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 mol

21、ding 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

22、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 groun

23、dPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB574)1.5 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the

24、 laserdiode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.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 gro

25、unding in the area where repairs are being performed. (1) Ground the workbenchGround the workbench 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 a

26、ny static electricity built up in your body. (3) Handling the optical pickup In order to maintain quality 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. (Re

27、fer 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 easilydestroy the laser diode. 1.6 Handling the traverse unit (optical pickup)(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is

28、a sensitive, complex unit. (2) Cut off the shorted part of the flexible cable using nippers, etc. after 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 atim

29、e 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 possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1.7 Attention when traverse unit is decomposed*Please refer to “Disasse

30、mbly method“ in the text for the pickup unit. Apply solder to the short land sections before the card wire 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 r

31、emove solder from the short land sections after connecting the card wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapPickup Connector Card wireShort land section(No.MB574)1-51.8 Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Vis

32、ible and/or invisible class II laser radiationwhen open. Do not stare into beam.(Others) Visible and/or invisible class 1M laser radiationwhen open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation whenopen and inter lock failed or defeated. Avoid d

33、irectexposure to beam.4.CAUTION : This laser product uses visible and/or 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 defeated. It is dangerous to defeat the safety switches.5.C

34、AUTION : If safety switches malfunction, the laser is ableto 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 POSITION OF LABELS and PRINT!Please use enough caution not to s

35、ee the beam directly or touch it in case of an adjustment or operationcheck. WARNING LABEL and PRINT1-6 (No.MB574)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB574)1-7SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the rear cover (See

36、 Fig. 1, 2)(1) Remove the six screws A attaching the rear cover. (SeeFig. 1)(2) Remove the three screws B attaching the rear cover frombottom side of main body. (See Fig. 2)Fig.1Fig.2AAARear coverB1-8 (No.MB574)3.1.2 Removing the side panel (See Fig. 3, 4)(1) Remove the two screws C attaching the bo

37、th side panels.(See Fig. 3)(2) Slide to backward and lift up then remove the both sidepanels. (See Fig. 4)Fig.3Fig.4Side panelCchookSide panel(No.MB574)1-93.1.3 Removing the top cover (See Fig. 5 to 8)(1) Remove the one screw D attaching the tuner bracket. (SeeFig. 5)(2) Disconnect the card wire fro

38、m tuner pack connected theconnector CN709 of the micon board. (See Fig. 6)(3) Disconnect the card wire from touch illumination boardconnected the connector CN711 of the micon board, (SeeFig. 6)(4) Remove the two screws E attaching the top cover. (SeeFig.6, 7)(5) Disengage the hook a and b form front

39、 panel assembly.(See Fig. 6, 7)(6) Lift up the top panel and then, disconnect the connectorwire from fan connected to the connector CN108 of thepower amplifier board. (See Fig. 8)Fig.5Fig.6Fig.7Fig.8DTop coverCN709CN711Micon boardEadhookhookE behookhookCN108Power amplifier board1-10 (No.MB574)3.1.4

40、Removing the front panel assembly (See Fig. 9, 3, 6, 7)(1) Disconnect the card wires from front panel assembly con-nected to the connector CN702 and CN710 of the miconboard. (See Fig. 9)(2) Disengage the hook c, d and e from the bottom chassis.(See Fig. 3, 6 and 7)Fig.93.1.5 Removing the heat sink (See Fig. 10)(1) Remove the two screws F attaching the heat sink.Fig.10CN710 CN702F