JVC-EXA1-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB3492005/1COMPACT COMPONENT SYSTEMMB34920051EX-A1TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC

2、 SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84ADJUSTMEN

3、T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-245TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

4、- - - - - - - - RadioFans.CN 收音机爱 好者资料库1- 2 (No.MB349)SPECIFICATIONDesigns and Specifications are subject to change without notice.GeneralPower sourceAC 230 V 50 HzPower consumption24 W (in operation)1.1 W (on standby)Weight3.0 kgExternal dimensions (W I I H I ID)232 mm I I 100 mm I I 269 mmDVD play

5、erPlayable discsDVD VIDEO, DVD AUDIO, VCD, Super VCD, CD, CD- R/RW(CD, VCD, MP3, JPEG format), DVD- R/ RW (video format)Video output Color systemPALHorizontal resolution500 linesSCART connector I I 1Audio output Analog sound output Speakers I I 260 W (30W + 30W) at 4 (10% THD)Output power (IEC 268-

6、3)Fitting impedance : 4 to 16 Headphones I I 111 mW/32 Fitting impedance : 16 to 1 kSubwoofer I I 1500 mVrms/10 kDigital sound outputOptical I I 1- 21 dBm to - 15 dBmOther outputAV COMPU LINK I I 2 (3.5)Audio inputSound inputAUX I I 1Level 1250 mV/50 kLevel 2500 mV/50 kTunerFM tunerReceiving frequen

7、cy87.5 MHz to 108.0 MHzAntenna75 - unbalanced typeAM tunerReceiving frequency522 kHz to 1629 kHzAntennaExternal antenna jack (loop antenna)SpeakerType1- way bass- reflex type Magnetically shielded typeSpeaker8cm cone I I 1Power handling capacity30 WImpedance4Sound pressure level81 dB/W mDimension (W

8、 I I H I I D)120 mm I I161 mm I I 239 mmWeight (1 unit)1.6 kgRadioFans.CN 收音机爱 好者资料库(No.MB349)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 sho

9、uld 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 circuitry of the product shouldnot be made. Any des

10、ign 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 electrical and mechanical parts in the products haves

11、pecial 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 parts which have these specialsafety charac

12、teristics 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 the same safety charac-teristics as the recom

13、mended 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 parts, moving parts and/orsharp edges for t

14、he 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 reassembling the product, always perform an iso

15、la-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 transformer during this check. Plug the AC line

16、cord directly into the AC outlet. Using aLeakage 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.). Alt

17、ernate 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 0.15k kF AC- type capacitor between an ex-posed metal part and a known good earth ground.Measure the

18、 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 outlet andrepeat each measurement. Volta

19、ge 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 and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) R

20、epairs 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.1.3CautionBurrs formed during molding may be left over on some partsof the c

21、hassis. Therefore, pay attention to such burrs in 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 ( ), d

22、iode ( )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) - - - - - - - 1- 4 (No.MB349)1.5 Safety Precautions (U.K only)

23、(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-ment parts must be identical to those used i

24、n the original circuits.(2) Any unauthorised design alterations or additions will void the manufacturers guarantee; furthermore the manufacturer cannotaccept responsibility for personal injury or property damage resulting therefrom.(3) Essential safety critical components are identified by ( ) on th

25、e Parts List and by shading on the schematics, and must neverbe replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts inthe product have special safety related characteristics. These characteristics are often not evident from visual in

26、spection. Partsother than specified by the manufacturer may not have the same safety characteristics as the recommended replacement partsshown in the Parts List of the Service Manual and may create shock, fire, or other hazards.(4) The leads in the products are routed and dressed with ties, clamps,

27、tubings, barriers and the like to be separated from live parts,high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been

28、 returned tonormal, after re- assembling.1.5.1Warning(1) Service should be performed by qualified personnel only.(2) This equipment has been designed and manufactured to meet international safety standards.(3) It is the legal responsibility of the repairer to ensure that these safety standards are m

29、aintained.(4) Repairs must be made in accordance with the relevant safety standards.(5) It is essential that safety critical components are replaced by approved parts.(6) If mains voltage selector is provided, check setting for local voltage.- - - - - - - - - - - - - - - - - -(No.MB349)1- 51.6Preven

30、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.1.6.1 Grounding to prevent damage by static e

31、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

32、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 installatio

33、n, 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 easi

34、lydestroy the laser diode. 1.7Handling 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

35、 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 poss

36、ible to adjust the semi- fixed resistor that adjusts the laser power. Do not turn it.1.8Attention 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

37、 the 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. - - - - - - - - - - - - - -1- 6 (No.MB349)1.9Important for la

38、ser products - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -; - -; *- - *- - -; -; - - - - - - - * *- - - - - - - - - -; ; - -; ; - ; ; ; - ; - -; -; - - - - - - - - - - - - - - - - -

39、-; - -; *- - *- - -; -; - - - - - - - * *- - - - - - - - - -; ; - -; ; - ; ; ; - ; - -; -; (No.MB349)1- 7SECTION 2SPECIFIC SERVICE INSTRUCTIONSThe DVD mechanism was running changed.The label is added to the lower left on the back of a center unit as the discernment method of a DVD mechanism from goo

40、ds appear-ance.Please refer to each model and the following manuals about the goods with which the label is not stuck on the position of a figure.EX-A1 B, E, EN versionMB156EX-A1 EE, EV, A versionMB181- - -1- 8 (No.MB349)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the top cover (See Fig.1)

41、(1) From the top side of the main body, remove the four screwsA attaching the top cover.Fig.1 (No.MB349)1- 93.1.2Removing the AL panel L and AL panel R (See Figs.2 to 7.) Remove the top cover.(1) Remove the two screws B, screw C and screw C attachingthe bridge A. (See Fig.2.)Reference:When attaching

42、 the screw C attach the lug wire with it.(See Fig.2.)(2) Remove the two screws C attaching the bridge B. (SeeFig.2.)(3) Remove the two screws C attaching the bridge C. (SeeFig.2.)(4) From the back side of the main body, remove the threescrews D attaching the bridge C. (See Fig.3.)Reference:When atta

43、ching the screws C attach the lug wires withthem. (See Fig.2.)(5) From the top side of the main body, remove the two screwsE attaching the AL panel L and AL panel R. (See Fig.4.)(6) From the bottom side of the main body, remove the threescrews F attaching the wood bar. (See Fig.5.)(7) Remove the six

44、 screws G and two screws H attaching theAL panel L and AL panel R. (See Fig.6.)(8) Remove the AL panel L and AL panel R in the direction ofthe arrow 2 while extending the back section of the AL pan-el L and AL panel R in the direction of the arrow 1. (SeeFig.7.)Fig.2Fig.3Fig.4 - - 1- 10 (No.MB349)Fi

45、g.5Fig.6Fig.7 (No.MB349)1- 113.1.3Removing the front panel assembly (See Fig.8) Remove the top cover, AL panel L and AL panel R.(1) Removing the three screws J attaching the front panel as-sembly. (See Fig.8.)(2) Release the claws a attaching the front panel assemblyand remove the front panel assemb

46、ly in the direction of thearrow. (See Fig.8.)Note:When attaching the front panel assembly, confirm that the con-nector CN804 on the front board is disconnected in the con-nector CN704 on the micom board certainly.Fig.8 - - 1- 12 (No.MB349)3.1.4Removing the rear panel (See Fig.9.)For A versionFrom th

47、e back side of the main body, remove the sixteenscrews K and screw L attaching the rear panel.For B/E/EN/EV/EE versionFrom the back side of the main body, remove the fifteenscrews K and screw L attaching the rear panel.3.1.5Removing the switching power unit (See Figs.9 and 10) Remove the top cover,

48、AL panel L and AL panel R.(1) From the back side of the main body, remove the screw Lattaching the switching power unit. (See Fig.9.)(2) From the right side of the main body, disconnect the wirefrom the connector CN201 on the main board. (SeeFig.10.)(3) Remove the screw M attaching the switching pow

49、er unit.(See Fig.10.)(4) From the top side of the switching power unit, remove thespacer fixing the lug wire. (See Fig.10.)(5) Take out the switching power unit from the main body in thedirection of the arrow. (See Fig.10.)Fig.9Fig.10 - - - - (No.MB349)1- 133.1.6Removing the tuner (See Figs.11 and 1

50、2) Remove the top cover and rear panel.(1) From the top side of the main body, remove the two screwsN attaching the bridge C. (See Fig.11.)Reference:When attaching the screws N, attach the lug wires withthem. (See Fig.11.)(2) Release the claws b of the tuner holder and take out thetuner from the mai