Jvc-THG-30-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2008 Victor Company of Japan, LimitedNo.MB6722008/9DVD DIGITAL THEATER SYSTEMMB67220089SERVICE 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 Centigrade)TABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-72 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-103 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-114 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-195 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20XV-THG40XV-THG30SP-THG50CSP-THG50F SP-THG50F (for Rear)SP-THG50WSP-THG50CSP-THG50F SP-THG50F (for Rear)SP-THG50WTH-G40TH-G301-2 (No.MB672)SPECIFICATIONTH-G40GeneralPower supply Refer to main label.Power consumption Refer to main label.Net Weight 4 kgExternal dimensions (W x H x D) 430 x 72 x 307 mmOperating conditions Temperature: 5°C to 35°C Operation status: HorizontalOperating humidity 5% to 85%Laser Semiconductor laser, wavelength 650 nmCD/DVDVideo system NTSCFrequency 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 output 1.0 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 OUT 480p/720p/1080i/1080pTuner (FM)Tuning Range 87.5 - 108.0 MHzIntermediate Frequency 10.7 MHzSignal-to Noise Ratio 60 dB (Mono) *Frequency Response 140 - 10,000 Hz *AmplifierStereo mode 155 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 Hz THD 10 %)Inputs AUDIO IN, OPTICAL IN, AUX INOutputs MONITOR OUT HDMI OUT COMPONENT VIDEO OUTSpeakersFront/Rear Speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 - 20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 117 x 210 x 111 mmNet Weight 0.9 kg(No.MB672)1-3Items with * are measured at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.TH-G40UJcenter speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 -20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 300 x 115 x 111 mmNet Weight 1.1 kgPassive Subwoofer Type 1 Way 1 SpeakerImpedance 3 Frequency Response 40 - 1500 HzSound Pressure Level 82 dB/W (1m)Rated Input Power 225 WMax. Input Power 450 WNet Dimensions (W x H x D) 236 x 435 x 391 mmNet Weight 5.7 kgGeneralPower supply 110-240 V 50/60 HzPower consumption 130 WNet Weight 4 kgExternal dimensions (W x H x D) 430 x 72 x 307 mmOperating conditions Temperature: 5°C to 35°C,Operation status: HorizontalOperating humidity 5% to 85%Laser Semiconductor laser,wavelength 650 nmCD/DVDVideo system NTSCFrequency 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 output 1.0 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 OUT 480p/720p/1080i/1080pTuner (FM)Tuning Range 87.5 - 108.0 MHzIntermediate Frequency 10.7 MHzSignal-to Noise Ratio 60 dB (Mono)*Frequency Response 140 - 10000 Hz*Amplifier1-4 (No.MB672)Items with * are measured at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.Surround mode(* Depending on the sound modesettings and the sourcethere 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 Hz,THD 10 %)Inputs AUDIO IN,OPTICAL IN,AUX INOutputs MONITOR OUT,HDMI OUT,COMPONENT VIDEO OUTSpeakersFront/Rear Speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 - 20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 117 x 210 x 111 mmNet Weight 0.9 kgcenter speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 -20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 300 x 115 x 111 mmNet Weight 1.1 kgPassive Subwoofer Type 1 Way 1 SpeakerImpedance 3 Frequency Response 40 - 1500 HzSound Pressure Level 82 dB/W (1m)Rated Input Power 225 WMax. Input Power 450 WNet Dimensions (W x H x D) 236 x 435 x 391 mmNet Weight 5.7 kg(No.MB672)1-5TH-G30GeneralPower supply Refer to main label.Power consumption Refer to main label.Net Weight 4 kgExternal dimensions (W x H x D) 430 x 72 x 307 mmOperating conditions Temperature: 5°C to 35°C Operation status: HorizontalOperating humidity 5% to 85%Laser Semiconductor laser, wavelength 650 nmCD/DVDVideo system NTSCFrequency 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 output 1.0 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 OUT 480p/720p/1080i/1080pTuner (FM)Tuning Range 87.5 - 108.0 MHzIntermediate Frequency 10.7 MHzSignal-to Noise Ratio 60 dB (Mono) *Frequency Response 140 - 10,000 Hz *AmplifierStereo mode 155 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 Hz THD 10 %)Inputs AUDIO IN, OPTICAL IN, AUX INOutputs MONITOR OUT HDMI OUT COMPONENT VIDEO OUTSpeakersFront/Rear Speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 - 20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 117 x 210 x 111 mmNet Weight 0.9 kg1-6 (No.MB672)Items with * are measured at Front Speaker Terminals in STEREO modeDesigns and specifications are subject to change without notice.center speaker Type 1 Way 1 SpeakerImpedance 4 Frequency Response 120 -20000 HzSound Pressure Level 83 dB/W (1m)Rated Input Power 155 WMax. Input Power 310 WNet Dimensions (W x H x D) 300 x 115 x 111 mmNet Weight 1.1 kgPassive Subwoofer Type 1 Way 1 SpeakerImpedance 3 Frequency Response 40 - 1500 HzSound Pressure Level 82 dB/W (1m)Rated Input Power 225 WMax. Input Power 450 WNet Dimensions (W x H x D) 236 x 435 x 391 mmNet Weight 5.7 kg(No.MB672)1-7SECTION 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 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 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 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 specialsafety 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 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 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 perform 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 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, 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 following manner. Connect a 1,500 10W resistorparalleled by a 0.15µF 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 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 and 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 approved 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 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 ( ), 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 part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-8 (No.MB672)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). 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 being 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 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 to check the condition of the laser diode in the optical pickup. The tester's 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 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) 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.1.7 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 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 after connecting the card wire.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapSolder short land section(No.MB672)1-91.8 Important for laser products1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiationwhen open. Do not stare into beam.(Others) Visible and/or invisible class 1M laser radiationwhen open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation whenopen and inter lock failed or defeated. Avoid directexposure to beam.4.CAUTION : This laser product uses visible and/or invisible laser radiation and is equipped with safety switches which prevent emission of radiat