Jvc-UXQD-70-W-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4962005/12MICRO COMPONENT MD SYSTEMMB496200512UX-QD70S,UX-QD70WLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-83 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-94 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-435 TROUBLESHOOTING . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53Area suffixUB - Hong Kong(SP-UXK30S)(SP-UXK30W)(SP-UXK30S)(SP-UXK30W)(CA-UXQD70S)(CA-UXQD70W)1-2 (No.MB496)SPECIFICATIONMD/DVD receiver (CA-UXQD70S/CA-UXQD70W)Amplifier Output power 20 W 2 (10

5、% THD/4 )Input terminals Analog AUX 1650 mV/47 k: LEVEL1260 mV/47 k: LEVEL2Digital Digital optical input 1-23 dBm to -15 dBm (Optical square terminal)(Compatible with frequency of 32 kHz, 44.1 kHz and 48 kHz)Output terminals Analog Speaker 1, 20 W/4 Impedance 4 - 16 Headphone (1), 25 mW/32 Impedance

6、 16 - 1 kDigital DVD/CD optical output 1-23 dBm to -15 dBm (Optical square terminal)Other AV COMPU LINK 2 ( 3.5)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)DVD player Playable discs DVD VIDEO, DVD AUDIO, CD, VCD, SVCD, CD-R/CDRW(

7、CD, VCD, SVCD, MP3/WMA/JPEG format),DVD-R(video format, MP3/WMA/JPEG format),DVD-RW(video format, DVD VR format, MP3/WMA/JPEG format)MD recorder Audio playing system MiniDisc digital audio systemRecording system Magneto-optical overwrite systemReading system Non-contact, semiconductor laser pickupRe

8、cording/Playback time(when using an 80-minute MD)SP 80 minutesLP2 160 minutesLP4 320 minutesSampling frequency 44.1 kHzAudio compression ATRAC (Adaptive TRansformsystem Acoustic Coding)/ATRAC3 (MDLP)Cassette deck Frequency response Normal (type l) 60 Hz - 14 000 HzWow and flutter 0.15% (WRMS)General

9、 Power source AC 220 V , 50 HzPower consumption 55 W (at operation)1.1 W (on standby)Dimensions 165 mm (W) 200 mm (H) 350 mm (D)Mass (approx.) 5.1 kg(No.MB496)1-3Speaker (SP-UXK30S/SP-UXK30W)Micro component MD system (UX-QD70S/UX-QD70W)U.S. and foreign patents licensed from Dolby Laboratories.Design

10、 and specification are subject to change without notice.System 3-way bass reflex typeMagnetically shielded typeSpeakers Woofer 10 cm cone speaker 1Midrange 4 cm cone speaker 1Tweeter 1.5 cm dome speaker 1Power handling capacity 20 WImpedance 4 Frequency range 56 Hz - 40 kHzSound pressure level 85 dB

11、/WmDimensions 135 mm (W) 200.5 mm (H) 213.5 mm (D)Mass (approx.) 2.1 kg (1 unit)Dimensions 435 mm (W) 200.5 mm (H) 350 mm (D)Mass (approx.) 9.3 kg1-4 (No.MB496)SECTION 1PRECAUTION1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially

12、 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 in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of th

13、e 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 further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom

14、.(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 afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age

15、, 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 the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement whi

16、ch 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 products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts

17、, 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 it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazar

18、d 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 shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a l

19、ine isolation transformer 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 gro

20、und. 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 the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an e

21、x-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 metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, revers

22、e 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.). 1.2 Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repa

23、irer 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 approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3 CautionBur

24、rs 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.1.4 Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the pa

25、rts 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 and rating as specified by the manufacturer. (This regulation dose not Except the J and C vers

26、ion)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE(No.MB496)1-51.5 Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharg

27、ed, 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 electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be carefu

28、l 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 conductive sheet) or an iron plate over it before placing thetraverse unit (optical pickup) on it.(2) Ground yourselfUse an anti-static wrist

29、 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, both sides of the laser diode on the replacement opticalpickup are shorted. After replacement, return the shorted parts to their orig

30、inal 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 easilydestroy the laser diode. 1.6 Handling the traverse unit (optical pickup)(1) Do not subject the traverse unit (optical pickup) to stron

31、g 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 details, refer to thereplacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to

32、 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 possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.1MConductive material(conductive sheet) or iron pala

33、te(caption)Anti-static wrist strap1-6 (No.MB496)1.7 Attention when pickup unit is removed1.7.1 Attention when MD pickup unit is removed*Please refer to “DISASSEMBLY“ in the text.(1) Apply solder to short land section before the flexible wire is disconnected from the connector CN310 on the MD servo c

34、ontrolboard.(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)(2) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.(3) Apply solder to short land section before the flexible wire i

35、s disconnected from the connector on the pickup.(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)(4) In the assembly, be sure to remove solder from the short land section after connecting the flexible wire.1.7.2 Attention when DVD pick

36、up unit is removed*Please refer to “DISASSEMBLY“ in the text.(1) Apply solder to short land sections before the card wire is disconnected from the connector on the pickup.(If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)(2) In the assembly

37、, be sure to remove solder from the short land sections after connecting the card wire.MD servo control boardMD servo control boardCN310PickupShort land sectionFlexible wirePickupShort land sectionFlexible wirePickupShort land sectionsConnectorCard wire(No.MB496)1-71.8 Important for laser products1.

38、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 Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The

39、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 defeated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the la

40、ser 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 POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated.AV

41、OID DIRECT EXPOSURE TO BEAM. (e)VARNING : Synlig ochosynling laserstrlning nr den ppnas och sprren rurkopplad. Betrakta ejstrlen. (s)VARO : Avattaessa ja suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Syn

42、lig 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 adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open

43、 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 olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumist

44、a suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL1-8 (No.MB496)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB496)1-9SECTIO

45、N 3DISASSEMBLY3.1 Main body section3.1.1 Removing the rear cover(B) (See Figs.1 and 2)(1) From the back side of the main body, remove the twelvescrews A attaching the rear cover(B). (See Fig.1.)(2) From the bottom side of the main body, remove the threescrews B attaching the rear cover(B). (See Fig.

46、2.)(3) Remove the rear cover(B) from the main body.Fig.1Fig.2Rear cover(B)AA AARear cover(B)B1-10 (No.MB496)3.1.2 Removing the side panels (L)/(R) (See Fig.3) Remove the rear cover(B).(1) From the bottom side of the main body, remove the twoscrews C attaching the side panels (L)/(R).(2) Slide the si

47、de panels (L)/(R) in the direction of the arrowand remove the side panels (L)/(R).Fig.33.1.3 Removing the top cover assembly (See Figs.4 and 5) Remove the rear cover(B) and side panels(L)/(R).(1) From the left side of the main body, disconnect the cardwires from the connectors (CN703, CN709) on the

48、miconboard. (See Fig.4.)(2) Remove the screw D attaching the top cover assembly.(See Fig.4.)(3) From the right side of the main body, disconnect the cardwire from the connector CN105 on the main board. (SeeFig.5.)(4) Disconnect the wire from the connector CN108 on the mainboard. (See Fig.5.)(5) From the both sides of the main body, remove the twoscrews E attaching the top cover assembly. (See Figs.4and 5.)(6) Release the joints a and remove the top cover assembly.(See Figs.4 and 5.)Fig.4Fig.5Side panel (R)Side panel (L)CCEDMicon boardCN703 CN709Top cover assembly aEMain boardTop