JVC-THG40-ddts-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2008 Victor Company of Japan, LimitedNo.MB6722008/9DVD DIGITAL THEATER SYSTEMMB67220089 SERVICE MANUALTH-G40J, TH-G40C, TH-G40UJ,TH-G30J, TH-G30CCOPYRIGHT 2008 Victor Company of Japan, LimitedLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigr

2、ade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-72SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . 1-103DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-114ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . 1-195TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20XV-THG40XV-THG30SP-THG50CSP-THG50FSP-THG50F (for Rear)SP-THG50WSP-THG50CSP-THG50FSP-THG50F (for Rear)SP-THG50WTH-

5、G40TH-G30RadioFans.CN 收音机爱 好者资料库1-2 (No.MB672)SPECIFICATIONTH-G40GeneralPower supplyRefer to main label.Power consumptionRefer to main label.Net Weight4 kgExternal dimensions (W x H x D)430 x 72 x 307 mmOperating conditionsTemperature: 5C to 35C Operation status: HorizontalOperating humidity5% to 85

6、%LaserSemiconductor laser, wavelength 650 nmCD/DVDVideo systemNTSCFrequency response (audio)140 Hz to 20 kHz *Signal-to-noise ratio (audio)More than 75 dB (1 kHz 20 kHz LPF/A-Filter) *Dynamic range (audio)More than 75 dB *Harmonic distortion (audio)0.5 % (1 kHz at 1W position) (20 kHz LPF) *VideoVid

7、eo output1.0 V (p-p) 75 negative sync. RCA jack x 1COMPONENT VIDEO OUT(Y) 1.0 V (p-p) 75 ohms negative sync RCA jack x 1(PB)/(PR) 0.7 V (p-p) 75 ohms RCA jack x 1HDMI OUT480p/720p/1080i/1080pTuner (FM)Tuning Range87.5 - 108.0 MHzIntermediate Frequency10.7 MHzSignal-to Noise Ratio60 dB (Mono) *Freque

8、ncy Response140 - 10,000 Hz *AmplifierStereo mode155 W + 155 W (4 at 1 kHz, THD 10 %)Surround mode(* Depending on the sound mode settings and the source there may be no sound output.)Front: 155 W + 155 W (THD 10 %)center*: 155 WSurround*: 155 W + 155 W (4 at 1 kHz THD 10 %)Subwoofer*: 225 W (3 at 70

9、 Hz THD 10 %)InputsAUDIO IN, OPTICAL IN, AUX INOutputsMONITOR OUT HDMI OUT COMPONENT VIDEO OUTSpeakersFront/Rear SpeakerType1 Way 1 SpeakerImpedance4 Frequency Response120 - 20000 HzSound Pressure Level83 dB/W (1m)Rated Input Power155 WMax. Input Power310 WNet Dimensions (W x H x D)117 x 210 x 111 m

10、mNet Weight0.9 kgRadioFans.CN 收音机爱 好者资料库(No.MB672)1-3Items with * are measured at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.TH-G40UJcenter speakerType1 Way 1 SpeakerImpedance4 Frequency Response120 -20000 HzSound Pressure Level83 dB/W (1m)R

11、ated Input Power155 WMax. Input Power310 WNet Dimensions (W x H x D)300 x 115 x 111 mmNet Weight1.1 kgPassive SubwooferType1 Way 1 SpeakerImpedance3 Frequency Response40 - 1500 HzSound Pressure Level82 dB/W (1m)Rated Input Power225 WMax. Input Power450 WNet Dimensions (W x H x D)236 x 435 x 391 mmNe

12、t Weight5.7 kgGeneralPower supply110-240 V 50/60 HzPower consumption130 WNet Weight4 kgExternal dimensions (W x H x D) 430 x 72 x 307 mmOperating conditionsTemperature: 5C to 35C,Operation status: HorizontalOperating humidity5% to 85%LaserSemiconductor laser,wavelength 650 nmCD/DVDVideo systemNTSCFr

13、equency response (audio)140 Hz to 20 kHz*Signal-to-noise ratio (audio)More than 75 dB (1 kHz,20 kHz LPF/A-Filter)*Dynamic range (audio)More than 75 dB*Harmonic distortion (audio)0.5 % (1 kHz,at 1W position) (20 kHz LPF)*VideoVideo output1.0 V (p-p),75 ,negative sync.,RCA jack x 1COMPONENT VIDEO OUT(

14、Y) 1.0 V (p-p),75 ohms,negative sync,RCA jack x 1(PB)/(PR) 0.7 V (p-p),75 ohms,RCA jack x 1HDMI OUT480p/720p/1080i/1080pTuner (FM)Tuning Range87.5 - 108.0 MHzIntermediate Frequency10.7 MHzSignal-to Noise Ratio60 dB (Mono)*Frequency Response140 - 10000 Hz*Amplifier1-4 (No.MB672)Items with * are measu

15、red at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.Surround mode(* Depending on the sound modesettings and the source there may be no sound output.)Front: 155 W + 155 W (THD 10 %)center*: 155 WSurround*: 155 W + 155 W (4 at 1 kHz,THD 10 %)Sub

16、woofer*: 225 W (3 at 70 Hz,THD 10 %)InputsAUDIO IN,OPTICAL IN,AUX INOutputsMONITOR OUT,HDMI OUT,COMPONENT VIDEO OUTSpeakersFront/Rear SpeakerType1 Way 1 SpeakerImpedance4 Frequency Response120 - 20000 HzSound Pressure Level83 dB/W (1m)Rated Input Power155 WMax. Input Power310 WNet Dimensions (W x H

17、x D)117 x 210 x 111 mmNet Weight0.9 kgcenter speakerType1 Way 1 SpeakerImpedance4 Frequency Response120 -20000 HzSound Pressure Level83 dB/W (1m)Rated Input Power155 WMax. Input Power310 WNet Dimensions (W x H x D)300 x 115 x 111 mmNet Weight1.1 kgPassive SubwooferType1 Way 1 SpeakerImpedance3 Frequ

18、ency Response40 - 1500 HzSound Pressure Level82 dB/W (1m)Rated Input Power225 WMax. Input Power450 WNet Dimensions (W x H x D)236 x 435 x 391 mmNet Weight5.7 kg(No.MB672)1-5TH-G30GeneralPower supplyRefer to main label.Power consumptionRefer to main label.Net Weight4 kgExternal dimensions (W x H x D)

19、430 x 72 x 307 mmOperating conditionsTemperature: 5C to 35C Operation status: HorizontalOperating humidity5% to 85%LaserSemiconductor laser, wavelength 650 nmCD/DVDVideo systemNTSCFrequency response (audio)140 Hz to 20 kHz *Signal-to-noise ratio (audio)More than 75 dB (1 kHz 20 kHz LPF/A-Filter) *Dy

20、namic range (audio)More than 75 dB *Harmonic distortion (audio)0.5 % (1 kHz at 1W position) (20 kHz LPF) *VideoVideo output1.0 V (p-p) 75 negative sync. RCA jack x 1COMPONENT VIDEO OUT(Y) 1.0 V (p-p) 75 ohms negative sync RCA jack x 1(PB)/(PR) 0.7 V (p-p) 75 ohms RCA jack x 1HDMI OUT480p/720p/1080i/

21、1080pTuner (FM)Tuning Range87.5 - 108.0 MHzIntermediate Frequency10.7 MHzSignal-to Noise Ratio60 dB (Mono) *Frequency Response140 - 10,000 Hz *AmplifierStereo mode155 W + 155 W (4 at 1 kHz, THD 10 %)Surround mode (* Depending on the sound mode settings and the source there may be no sound output.)Fr

22、ont: 155 W + 155 W (THD 10 %)center*: 155 WSurround*: 155 W + 155 W (4 at 1 kHz THD 10 %)Subwoofer*: 225 W (3 at 70 Hz THD 10 %)InputsAUDIO IN, OPTICAL IN, AUX INOutputsMONITOR OUT HDMI OUT COMPONENT VIDEO OUTSpeakersFront/Rear SpeakerType1 Way 1 SpeakerImpedance4 Frequency Response120 - 20000 HzSou

23、nd Pressure Level83 dB/W (1m)Rated Input Power155 WMax. Input Power310 WNet Dimensions (W x H x D)117 x 210 x 111 mmNet Weight0.9 kg1-6 (No.MB672)Items with * are measured at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.center speakerType1 Way

24、 1 SpeakerImpedance4 Frequency Response120 -20000 HzSound Pressure Level83 dB/W (1m)Rated Input Power155 WMax. Input Power310 WNet Dimensions (W x H x D)300 x 115 x 111 mmNet Weight1.1 kgPassive SubwooferType1 Way 1 SpeakerImpedance3 Frequency Response40 - 1500 HzSound Pressure Level82 dB/W (1m)Rate

25、d Input Power225 WMax. Input Power450 WNet Dimensions (W x H x D)236 x 435 x 391 mmNet Weight5.7 kg(No.MB672)1-7SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection,

26、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 the design or circuitry of the product shouldnot be

27、 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.(3) Many electrical and mechanical parts in the

28、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, etc. Replacement parts which have these special

29、safety 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

30、 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, high temperature parts, moving parts and/orshar

31、p 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 hazard testingAfter reassembling the product, always p

32、erform 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

33、 the AC line 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

34、(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 ex-posed metal part and a known good earth ground.Me

35、asure 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 each measurem

36、ent. Voltage 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 mainta

37、ined.(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.1.3CautionBurrs formed during molding may be left over on some par

38、tsof the chassis. 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 resist

39、or ( ), 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 version)Good earth groundPlace this probe on each exposedmetal

40、 part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-8 (No.MB672)1.5Preventing 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 (optic

41、al 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 careful to use proper grounding in the area where repairs are be

42、ing 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 strap to release any static electricity built up in your

43、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 original condition. (Refer to the text.) Do not use a tester t

44、o check the condition of the laser diode in the optical pickup. The testers internal power source can easilydestroy the laser diode. 1.6Handling 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 t

45、he 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 take too long atime when attaching it to the connector. (3

46、) 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.1.7Attention when traverse unit is decomposed*Please refer to Disassembly method in the text for the pickup uni

47、t. Apply solder to the short land sections before the card wire is disconnected from the connecto on the servo board. (If the card wireis 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 a

48、fter connecting the card wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapSolder short land section(No.MB672)1-91.8Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation when open. Do no

49、t stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.4.CAUTION : This laser product uses

50、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 interlocks have failed or are defeated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able