Jvc-THA-5-Service-Manual电路原理图.pdf

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1、SERVICE MANUALNo.21062Jan. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.Safety precautionsImportant for laser productsPreventing static electricityDisassembly method1-21-31-41-5Wiring connectionAdjustment methodDescription of major ICs 1-121-131-1533ContentsDVD DIGITAL CINEMA SYSTEMTH-A5TH-A5Area

2、 suffixA - AustraliaUS - SingaporeUB - Hong KongUW - Brazil,Mexico,PeruUY - ArgentinaUJ - U.S.MilitaryUG - Turkey,South Africa,EgyptSP-XCA5 SP-XSA5 2XV-THA5 SP-WA5DIGITALSURROUNDDIGITALCOMPACTDIGITAL VIDEOSTANDBYAUDIO/FM MODEDSP VOLUME SOURCEDVD DIGITAL CINEMA SYSTEM TH-A5STANDBY/ONDISPLAY TV/VIDEOT

3、OP MENUAUDIOONTUNER PRESETENTERVCR CHANNELTUNINGDVD FM/AM AUX MUTINGSTANDBY/ONVCRVCR CONTROLMENUTVAUDIO/FM MODE SUBTITLERETURN STEPOFFTV VOLUMETV CHANNELVOLUMEB.SEARCH F.SEARCHDOWN UPREW FFRM-STHA5UDVD CINEMA SYSTEMSP-XSA5 2TH-A51-21. This design of this product contains special hardware and many ci

4、rcuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified pers

5、onnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or

6、 property damage resulting therefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components

7、 rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. Th

8、e use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and t

9、he 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 is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal,

10、after re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the produ

11、ct is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check.Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester“, measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed m

12、etal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Con

13、nect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a retur

14、n path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1. This equipment has been designed and manufactured to meet int

15、ernational safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains vo

16、ltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention t

17、o such burrs in the case of preforming repair of this system.In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the “ “ mark nearby are

18、critical for safety. (This regulation does not correspond to J and C version.)TH-A51-3Important 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 t

19、heLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed

20、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 herein may result in hazardous radiation exposure.REPRODUCTION AND

21、 POSITION OF LABELS!Please use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTTH-A51-4Preventing static electricity1.Grounding to prevent damage by static electricityElectrostatic discharge (ESD), which occurs when static electr

22、icity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.2.About the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy

23、 the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the trave

24、rse unit (optical pickup) on it.2-2 Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical

25、pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 4.Handling the traverse unit

26、(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 details, refer to the replacement procedure in the text. R

27、emove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser

28、 power. Do not turn it.Attention when traverse unit is decomposed*Please refer to “Disassembly method“ in the text for pick-up and how to detach the substrate. (caption)Anti-static wrist strapConductive material (conductive sheet) or iron plateSolder is put up before the card wire is removed from co

29、nnector on the pick up board as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)Please remove solder after connecting the card wire with when you install picking up in the substrate.1.2.DVD loadingmechanismDVD loader boardPick up boardCard

30、 wireShort landConnectorDVD mechanism assembly (bottom side) (These two points are soldered respectively, and are made to short-circuit)TH-A51-5Remove the four screws A attaching the top cover on the both sides of the body.Remove the two screws B on the back of the body.Remove the top cover from beh

31、ind in the direction of the arrow while pulling both sides outward.1.2.3.Disassembly methodRemoving the top cover (See Fig.1)Prior to performing the following procedure, remove the top cover.Remove the one screw a and remove the earth wier.Remove the three screws C attaching the front panel assembly

32、 on the bottom of the body.Remove the two screws D attaching the front panel assembly on the both sides of the body.Remove the claw1, claw2 and claw3, and detach the front panel assembly toward the front.Disconnect the card wire from the connector DW20 on the DSP board.1.2.3.4.5.Removing the front p

33、anel assembly (See Fig.2A, 2B and 3)Prior to performing the following procedure, remove the top cover.Disconnect the power cord from the connector CW1 on the main board and pull up the cord stopper upward.Notes : The power cord is exchangeable.1.Removing the power cord (See Fig.4)D(both side)Claw2 (

34、both side)Fig.1Fig.2AFig.2BFig.3Fig.4A 2BTop coverCCClaw1Power cord stopperPower cordTie bandFront panel assembly(bottom side)Front panel assemblyFront panel assembly(Inner side)Rear panelClaw3DSP boardDisplay boarda(fixing the earth wire)DW20CW1TH-A51-6Prior to performing the following procedure, r

35、emove the top cover and power cord.Disconnect the harness from the connector NW11 on the DSP board.Remove the two screws F, four screws G, five screws I attaching the each boards to the rear panel.Remove the three screws J attaching the rear panel on the back of the body.1.2.3.Removing the rear pane

36、l (See Fig.7 and 8)Removing the tuner pack (See Fig.7 and 8)Prior to performing the following procedure, remove the top cover.Disconnect the card wire from the connector CON01 on the tuner pack.Remove the two screws F attaching the tuner pack to the rear panel.1.2.Removing the fan motor (See Fig.7 a

37、nd 8)Prior to performing the following procedures, remove the top cover .Disconnect the harness from the connector NW11 on the DSP board .Removing the two screws H attaching the fan motor on the rear panel.1.2.Prior to performing the following procedure, remove the top cover.Disconnect the card wire

38、 from the connector VW2 on the jack board.Remove the four screws G attaching the jack board to the rear panel.Disconnect the connector VW1 on the jack board and pull up the jack board.1.2.3.Removing the jack board (See Fig.7 and 8)Removing the DVD mechanism assembly(See Fig.5 and 6)Prior to performi

39、ng the following procedure, remove the top cover.Disconnect the card wire from the connector J14 and J21 on the DVD MPEG board.Remove the two screws E attaching the DVD mechanism assembly and pull up with drawing out.Disconnect the harness from the connector J2 on the DVD loader board.1.2.3.FJJJGHIJ

40、2Fig.5Fig.6Fig.8Fig.7DVD mechanism assemblyTuner packJack boardDSP boardFan motorNW11(on theDSP board)VW2VW1CON01Rear panelERear panelRear panelDVD mechanism assemblyJ14J21DVDMPEGboardDVD loader boardTH-A51-7Prior to performing the following procedure, remove the top cover, front panel assembly, DVD

41、 mechanism assembly, jack board and DSP board.Disconnect the card wire from the connector CW4 and CW8 on the main board.Disconnect the harness from the connector CW3 on the main board.Remove the five screws I attaching the speaker terminals and jack to the rear panel (see fig.7).Remove the six screw

42、s K1 (short) and one screw K2 (long) attaching the main board.When the rear panel is not removed, pull up the main board from front side.1.2.3.4.5.Prior to performing the following procedure, remove the top cover, front panel assembly, DVD mechanism assembly, jack board, DSP board and main board.Aft

43、er removing the solder part soldered to the main board, remove each screw and remove the heat sink from Power transistor.After removing the solder part soldered to the main board, remove each screw and remove the heat sink from Power IC.1.2.Removing the main board (See Fig.10)Prior to performing the

44、 following procedure, remove the top cover, the front panel assembly and jack board.Untied the harness band and disconnect the harness from the connector CW2 on the main board.Disconnect the harness from the connector NW11 on the DSP board.Disconnect the card wire from the connector VW12 on the DSP

45、board.Pull up the DSP board from the front side upwards disconnecting the connector DW10, DW13, DW14 and DW15.1.2.3.4.Removing the DSP board (See Fig.9)Removing the power transistor & power IC(See Fig.10 and 11)Fig.11K2K1K1Solder partSolder part(Power IC is fixed)Solder part Solder partHeat sink(to

46、which power IC is attached)Main board(Reverse side )(Each power transistor is fixed)Fig.9Fig.10Harness band CW2NW11DW10DW13CW3Power ICsHeat sink(to whichpowertransistoris attached)CW4CW8DW14DW15VW12DSP board Main board(Rear panel side)(Front panel side)Main boardTH-A51-81.2.3.Prior to performing the

47、 following procedure, remove the top cover, front panel assembly and DSP board.Disconnect the harness and card wire from the connector PW1, PW2 and PW5 on the DVD power board.Remove the one screw L1 (short) and two screws L2 (long) attaching the DVD power board.1.2.Removing the DVD power board(See F

48、ig.12)Removing the power transformer(See Fig.12)Prior to performing the following procedure, remove the top cover.Cut off the tie band fixing the harness, if needed.Disconnect the harness from the connector CW2 on the main board (see fig.9) and PW1, PW2 on the DVD power board.Remove the four screws

49、M attaching the power transformer.Prior to performing the following procedure, remove the top cover and the front panel assembly.Disconnect the card wire from the connector FW1 on the display board.Remove the five screws A attaching the display board on the inner of the front panel assembly.Remove the four screws B attaching the switch board on the inner of the front panel assembly.Discon