Jvc-THM-508-Service-Manual电路原理图.pdf

《Jvc-THM-508-Service-Manual电路原理图.pdf》由会员分享，可在线阅读，更多相关《Jvc-THM-508-Service-Manual电路原理图.pdf（89页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2942004/7DVD DIGITAL CINEMA SYSTEMMB29420047TH-M508TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42 SPE

2、CIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-73 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84 A

3、DJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-345 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . 1-36Area suffixUS - SingaporeUW - Brazil,Mexico,PeruUX - Saudi ArabiaUG - Turkey,South Africa,EgyptUN - Asean(SP-THM508C) (SP-THM508F)(SP-THM505S) (SP-PWM508)(XV-THM508)1-2 (No.MB294)SPECIFICATIONCenter unit (XV-THM508)*1 : This value is measured at System cord CONNECTOR for reference.*2 : Corre

5、sponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)*3 : For PAL systemSubwoofer (SP-PWM508)Satellite Speakers-Front speakers (SP-THM508F)Audio section Digital input*2 DIGITAL IN (DBS) (OPTICAL) -21 dBm to -15 dBm (660 nm E30 nm)Video s

6、ection Video System NTSC/PAL selectableHorizontal Resolution 500 linesSignal-to-Noise Ratio 64 dBVideo output level Composite 1.0 V(p-p)/75 S-video-Y 1.0 V(p-p)/75 S-video-C 0.286 V (0.3 V*3) (p-p)/75 Component-Y 1.0 V(p-p)/75 Component-PB/PR 0.7 V(p-p)/75 Video input sensitivity/Impedance (VCR IN)C

7、omposite 1.0 V(p-p)/75 S-video-Y 1.0 V(p-p)/75 S-video-C 0.286 V (0.3 V*3) (p-p)/75 Tuner section Tuning Range FM 87.50 MHz to 108.00 MHzAM 531 kHz to 1 602 kHz (at 9 kHz intervals)530 kHz to 1 600 kHz (at 10 kHz intervals)General Power Requirements AC 110 - 240 V , 50/60 Hz (except for Australia)AC

8、 240 V , 50 Hz (for Australia only)Power Consumption 18 W (at operation) 2.0 W (in standby mode)Dimensions (W H D) 400 mm 85 mm 380 mmMass 4.3 kgAmplifier section Front/Center/Surround 140 W per channel, RMS at 4 (Center/Surround)/ 140 W per channel, RMS at 4 (Front) at 1 kHz, with 10 % total harmon

9、ic distortion.Subwoofer 300 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion.Speaker section Speaker unit 25 cm Bass-reflex, Magnetically ShieldedFrequency Range 20 Hz to 200 HzGeneral Power Requirements AC 110 V/127 V/220 - 240 V selectable with the voltage selector, 50 Hz/60 HzPower Cons

10、umption 170 W (at operation) 0 W (in standby mode)Dimensions (W H D) 256 mm 482 mm 460 mmMass 18.5 kgSpeakers Woofer 10.0 cm 2Tweeter 4.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity 140 WImpedance 4 Frequency Range 60 Hz to 20 kHzDimensions (W H D) 250 mm 1065.5 mm 310 mmMass 7.2 k

11、g(No.MB294)1-3Satellite Speakers-Surround speakers (SP-THM505S)Satellite Speakers-Center speaker (SP-THM508C)Designs & specifications are subject to change without notice.Speakers 8.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity 140 WImpedance 4 Frequency Range 80 Hz to 20 kHzDimens

12、ions (W H D) 111.5 mm 139 mm 106.5 mmMass 0.52 kgSpeakers Woofer 8.0 cm 2Tweeter 4.0 cm, Bass-reflex, Magnetically ShieldedPower Handling Capacity 140 WImpedance 4 Frequency Range 65 Hz to 20 kHzDimensions (W H D) 326 mm 119 mm 170 mmMass 2.5 kg1-4 (No.MB294)SECTION 1PRECAUTION1.1 Safety Precautions

13、(1) This design of this product contains special hardware andmany circuits and components specially 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

14、 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 design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further

15、 relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(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

16、by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, 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 s

17、chematics 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 recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are

18、 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 the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it sho

19、uld be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard 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 shaf

20、ts, 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 cord directly into the AC outlet. Using a“Leakage Current Tester“, measure the leakage currentfrom each exposed metal parts of the cabinet,

21、 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.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the

22、 following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-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

23、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. 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 an

24、d manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer 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 appr

25、oved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3 CautionBurrs 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 wit

26、h 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 ( ), diode ( )and ICP ( ) or identified by the “ “ mark nearby are criticalfor safety. When replacing them, be sure to use the parts of thesame

27、type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)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.MB294)1-51.5 Preventing static electricityElectrostatic

28、 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.1.5.1 Grounding to prevent damage by static electricityStatic electricity in the

29、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 conductive sheet) or an iron plate over it

30、 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 installation, both sides of the laser diode on t

31、he 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 easilydestroy the laser diode. 1.6 Handli

32、ng 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 details, refer to thereplacement pr

33、ocedure 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 possible to adjust the semi-fixed resisto

34、r that adjusts the laser power. Do not turn it.1.7 Attention 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 the servo board. (If the flexiblew

35、ire 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.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapTraverse me

36、chanism assemblyConnectorShort land sectionsFlexible wirePickup1-6 (No.MB294)1.8 Important 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 theLas

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

38、 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 exposure.REPRODUCTION AND

39、POSITION OF LABELSCAUTION : Visible and Invisible laser radiation when open 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 viallise

40、na olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig 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 o

41、f an adjustment or operationcheck.CLASS 1LASER PRODUCTCAUTION : Visible and Invisible laser radiation when open 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

42、 suojalukitusohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmllelasersteilylle. Vlt steenkohdistumista suoraan itseesi. (f)ADVARSEL : Synlig og usynliglaserstrling nr maskinen erben eller interlocken fejeler.Undg direkte eksponering til strling. (d)WARNING LABEL(No.MB294)1-7SECTION 2SPECIF

43、IC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-8 (No.MB294)SECTION 3DISASSEMBLY3.1 Main body section3.1.1 Removing the metal cover (See Figs.1 to 4)(1) From the both sides of the main body, remove the fourscrews A attaching the metal cover. (See Figs.1 a

44、nd 2)(2) From the back side of the main body, remove the threescrews B attaching the metal cover. (See Fig.3)(3) Lift the rear section of the metal cover in the direction of thearrow while extending the lower sections of the metal cov-er, release the five claws a using a longer screwdriver fromthe i

45、nside as required. (See Fig.4)Note:Do not damage any parts and boards inside the main bodywhen releasing the claws a using a longer screwdriver. Fig.1Fig.2Fig.3Fig.4Metal coverAMetal coverAMetal coverBMetal coverClaws a Claws a(No.MB294)1-93.1.2 Removing the front panel assembly (See Figs.5 and 6) P

46、rior to performing the following procedures, remove the metalcover.(1) From the top side of the main body, disconnect the parallelwires from the connectors (CN456, CN457) on the mainboard. (See Fig.5)(2) Disconnect the card wires from the connectors (CN450,CN460) on the main board. (See Fig.5)(3) Re

47、move the screw C attaching the earth wire to the mainboard. (See Fig.5)Reference:When attaching the screw C, attach the earth wire withit. (See Fig.5)(4) From the bottom side of the main body, remove the threescrews D attaching the front panel assembly. (See Fig.6)(5) From the both and bottom sides

48、of the main body, removethe front panel assembly in the direction of the arrow whilereleasing the joints b and c. (See Fig.6)Fig.5Fig.6CN460Main boardCCard wireEarthwireFront panel assemblyCN457Parallel wiresCN450CN456Card wireDJoint c Joint bJoint bFront panel assembly1-10 (No.MB294)3.1.3 Removing the DVD changer mechanism assembly (See Fig.7) Prior to performing the following procedures, remove metalcover and front panel assembly.(1) From the top side of the main body, remove the screw E at-taching