Jvc-XVN-450-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2007 Victor Company of Japan, LimitedNo.YD1182007/6DVD PLAYERYD11820075SERVICE MANUALXV-N450BUC, XV-N452SUC, XV-N452SUMCOPYRIGHT 2007 Victor Company of Japan, LimitedTABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-74 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-125 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13XV-N450BUC,XV-N452SUC,XV-N452SUM D7P2DISPLAYArea SuffixUC - CanadaUM - Latin America1-2 (No.YD118)SPECIFICATIONNote:Design and specifications are subject to change without prior notice.XV-N450BUC, XV-N452SUC, XV-N452SUM

5、GeneralPower requirements AC120 V, 60 HzPower consumption 8 WDimensions (Approx.) 430 35 201 mm (17 1.4 7.9 inches) (W H D) without footNet weight (Approx.) 1.6 kg (3.5 lbs)Operating temperature 5 C to 35 C (41 F to 95 F)Operating humidity 5 % to 90 %OutputsVIDEO OUT 1.0 V (p-p), 75 , sync negative,

6、 RCA jack 1 S-VIDEO OUT (Y) 1.0 V (p-p), 75 ,negative sync, Mini DIN 4-pin 1(C) 0.3 V (p-p),75 COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 ,negative sync, RCA jack 1, (Pb)/(Pr) 0.7 V (p-p),75 , RCA jack x 2AUDIO OUT 2.0 Vrms (1 KHz, 0 dB), 600 , RCA jack (L, R) 1 DIGITAL OUT (COAXIAL) 0.5 V (p-p), 75 ,

7、RCA jack 1SystemLaserSemiconductor laser, wavelength 650 nmSignal systemNTSCFrequency response DVD (PCM 96 kHz): 8 Hz to 44 kHzDVD (PCM 48 kHz): 8 Hz to 22 kHzCD: 8 Hz to 20 kHzSignal-to-noise ratio More than 90 dB (ANALOG OUT connectors only)Harmonic distortion Less than 0.02%Dynamic range More tha

8、n 95 dB (DVD/CD)AccessoriesVideo cable (1), Audio cable (1), Remote control (1), Batteries (2)(No.YD118)1-3SECTION 1PRECAUTION1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no c

9、hanges 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 circuitry of the product shouldnot be mad

10、e. 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 electrical and mechanical parts in the prod

11、ucts 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 parts which have these specialsafe

12、ty 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 the same safety charac-teristics as

13、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 parts, moving parts and/orsharp ed

14、ges 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 testing)After reassembling the product, always perf

15、orm 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 transformer during this check. Plug th

16、e 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 cur-rent must not exceed 0.5mA AC (

17、r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 ohms per volt or more sensi-tivity in the following manner. Connect a 1,500 ohm 10Wresistor paralleled by a 0.15 F AC-type capacitor be-tween an exposed metal part and a known good eart

18、hground.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 outlet andrepeat eac

19、h 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 thatthese safety standards

20、 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 molding may be left over

21、 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 over with black such

22、as the resistor ( ), diode ( )and ICP ( ) or identified by the “ “ mark nearby are critical forsafety. When replacing them, be sure to use the parts of thesame type and rating as specified by the manufacturer. (Exceptthe JC version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTM

23、ETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.YD118)1.5 Preventing 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). T

24、ake 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 DVD players. Be careful to use proper grounding in the area where repairs are being performed. (

25、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 any static electricity built up in your body. (3) Handli

26、ng 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. (Refer to the text.) Do not use a tester to check the cond

27、ition 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 a sensitive, complex unit. (2) Cut off the shorted part

28、 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 longa time when attaching it to the connector. (3) Handle the fl

29、exible 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 Precautions of the safe use of battery Store the battery in a place where children cannot reach.If a child accidentally sw

30、allows the battery, consult a doctorimmediately. Do not recharge, short, disassemble or heat the battery or dispose of it in a fire.Doing any of these things may cause the battery to give off heat, crack, or start a fire. Do not leave the battery with other metallic materials.Doing this may cause th

31、e battery to give off heat, crack, or start a fire. When throwing away or saving the battery, wrap it in tape and insulate; otherwise, the battery may start to give off heat, crack, orstart a fire. Do not poke the battery with tweezers or similar tools.Doing this may cause the battery to give off he

32、at, crack, or start a fire. Dispose of batteries in the proper manner, according to federal, state, and local regulations.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strap(No.YD118)1-51.8 Important for laser productsCAUTION : VISIBLE AND/OR INVISIBLE CLASS 1M LAS

33、ER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS. 1.CLASS 1 LASER PRODUCT2.CAUTION : VISIBLE AND/OR INVISIBLE CLASS 1M LASER RADIATION WHEN OPEN. DO NOT STARE INTO BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS. 3.CAUTION : There are no serviceable parts insid

34、e theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The laser products 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 interl

35、ocks have failed or are defeated. 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 exposur

36、e.!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.1-6 (No.YD118)SECTION 2SPECIFIC SERVICE INSTRUCTIONS2.1 SERVICE INFORMATION FOR EEPROMPOWER ONPress number 08, Press charaterAF (16 for a while)Press pause key onceChange will be applied

37、when powerOFFON.Use arrow key (F D G E) to moveto approprite position and makechangesDVD LOGO Status (NO Disk status)RemotecontrolPause key1472 in order.MODEL : XV-N450B/XV-N452SNAME HEXOPT 1 00OPT 2 00OPT 3 00OPT 4 00OPT 5 00OPT 6 00OPT 7 00OPT 8 00DETECT NEW EEPROM(OPTION EDIT SCREEN)(No.YD118)1-7

38、SECTION 3DISASSEMBLY3.1 Main body section3.1.1 Removing the top cover (See figure 1)(1) Remove the two screws A attaching the top cover on bothsides of the main body.(2) Remove the three screws B attaching the top cover on theback of the main body.(3) Raise the both sides and lower part of the rear

39、of the topcover, with opening them slightly in an outward direction.And the top cover will be removed.Fig.13.1.2 Removing the front panel assembly (See figure 2, fig-ure 3) Prior to performing the following procedure, remove the topcover.(1) Disconnect the card wire from connector P6901 on themain b

40、oard.(2) Remove the eight hooks a, and then remove the front panelassembly.Fig.2Fig.33.1.3 Removing the mechanism assembly (See figure 4) Prior to performing the following procedure, remove the topcover and front panel assembly.(1) Disconnect the card wire from connectors P2201 andP2202 on the main

41、board.(2) Remove the four screws C attaching the mechanism as-sembly.Fig.43.1.4 Removing the regulator board and main board (Seefigure 5) Prior to performing the following procedure, remove the topcover.(1) Disconnect the wire from connector PW6101 on the mainboard.(2) Disconnect the power cord from

42、 connector PW101 on theregulator board.(3) Remove the four screws D attaching the regulator board.(4) Disconnect the card wire from connectors P2201, P2202,and P6901 on the main board.(5) Remove the two screws E attaching the main board.(6) Remove the two screws F attaching the main board withrear p

43、anel.Fig.5BA x 2TOP COVEROP COVERBBHook aHook a Hook aMain boardFront panel assemblyP6901Hook aHook aFront panelassemblyHook aP2201CCCCP2202Main boardMechanism assemblyDDFP6901Main boardPW101Regulator boardDDFPW6101EEP2202P22011-8 (No.YD118)3.2 DVD MECHANISM PARTS LOCATION TOP VIEW (WITH TRAY) TOP V

44、IEW (WITHOUT TRAY) BOTTOM VIEWProcedureParts Fixing TypeDisass emblyFig-ureStarting No.1 Main Base 4-112Clamp Assem-bly Disc4-11, 2 3 Plate Clamp 4-11, 2, 3 4 Magnet Clamp 4-11, 2, 3, 4 5 Clamp Upper 4-116Tray Disc 4-21, 6 7Base Assembly Sled4-31, 2, 6 8 Gear Feed4 Screws,1 Connector1 Locking Tabs4-

45、31, 2, 6, 8 9 Gear Middle1, 2, 6, 8,9 10 Gear Rack 1 Screw 4-31, 2, 7 11 Rubber Rear 4-31, 2, 7 12Frame Assem-bly Up/Down1 Screw Bottom 4-41, 2 13 Belt Loading 1 Locking Tab 4-41, 2 ,13 14 Gear Pulley 4-41, 2, 13, 14 15 Gear Loading 1 Locking Tab 4-41, 2, 7, 12, 13, 1416 Guide Up/Down 4-41, 2, 13 17

46、 PWB Assembly Loading1 Locking Tab1 Hook2 ScrewBottom 4-41,2,7,12,13,14,15,16,1718 Base Main 2 Locking Tabs 4-4Note When reassembling, perform the procedure in reverse order.The “Bottom” on Disassembly column of above Table indicatesthe part should be disassembled at the Bottom side.(No.YD118)1-93.3

47、 DVD MECHANISM DISASSEMBLYFig.4-13.3.1 MAIN BASE (FIG. 4-1)3.3.1.1 Clamp Assembly Disc(1) Place the Clamp Assembly Disc as Fig. (A)(2) Lift up the Clamp Assembly Disc in direction of arrow(A).(3) Separate the Clamp Assembly Disc from the HolderClamp.3.3.1.1.1 Plate Clamp(1) Turn the Plate Clamp to c

48、ounterclockwise direction andthen lift up the Plate Clamp.3.3.1.1.2 Magnet Clamp3.3.1.1.3 Clamp UpperFig.4-23.3.2 TRAY DISC (FIG. 4-2)(1) Insert and push a Driver in the emergency eject hole(A) atthe right side, or put the Driver on the Lever(B) of the GearEmergency and pull the Lever(B) in directio

49、n of arrow sothat the Tray Disc is ejected about 1520mm.(2) Pull the Tray Disc until it is separated from the Base Maincompletely.1-10 (No.YD118)Fig.4-33.3.3 BASE ASSEMBLY SLED (FIG. 4-3)(1) Release 4 Screw (S2).(2) Disconnect the FFC Connector (C1)3.3.3.1 Gear Feed3.3.3.2 Gear Middle3.3.3.3 Gear Rack(1) Release the Scerw (S3)3.3.4 RUBBER REAR (FIG. 4-3)