JVC-THG40-ddts-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2008 Victor Company of Japan, Limited No.MB672 2008/9 DVD DIGITAL THEATER SYSTEM MB67220089 SERVICE MANUAL TH-G40J, TH-G40C, TH-G40UJ, TH-G30J, TH-G30C COPYRIGHT 2008 Victor Company of Japan, Limited Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 21

2、9 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . 1-10 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . 1-19 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 XV-THG40 XV-THG30 SP-THG50C SP-THG50FSP-THG50F (for Rear) SP-THG50W SP-THG50C SP-THG50FSP-THG50F

5、(for Rear) SP-THG50W TH-G40 TH-G30 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB672) SPECIFICATION TH-G40 General Power supplyRefer to main label. Power consumptionRefer to main label. Net Weight4 kg External dimensions (W x H x D)430 x 72 x 307 mm Operating conditionsTemperature: 5C to 35C Operation status: H

6、orizontal Operating humidity5% to 85% LaserSemiconductor laser, wavelength 650 nm CD/DVD Video systemNTSC Frequency 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

7、 kHz at 1W position) (20 kHz LPF) * Video Video output1.0 V (p-p) 75 negative sync. RCA jack x 1 COMPONENT 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 1 HDMI OUT480p/720p/1080i/1080p Tuner (FM) Tuning Range87.5 - 108.0 MHz Intermediate Frequen

8、cy10.7 MHz Signal-to Noise Ratio60 dB (Mono) * Frequency Response140 - 10,000 Hz * Amplifier Stereo 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 W Surround*: 1

9、55 W + 155 W (4 at 1 kHz THD 10 %) Subwoofer*: 225 W (3 at 70 Hz THD 10 %) InputsAUDIO IN, OPTICAL IN, AUX IN OutputsMONITOR OUT HDMI OUT COMPONENT VIDEO OUT Speakers Front/Rear SpeakerType1 Way 1 Speaker Impedance4 Frequency Response120 - 20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Power1

10、55 W Max. Input Power310 W Net Dimensions (W x H x D)117 x 210 x 111 mm Net Weight0.9 kg RadioFans.CN 收音机爱 好者资料库 (No.MB672)1-3 Items with * are measured at Front Speaker Terminals in STEREO mode Designs and specifications are subject to change without notice. TH-G40UJ center speakerType1 Way 1 Speak

11、er Impedance4 Frequency Response120 -20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Power155 W Max. Input Power310 W Net Dimensions (W x H x D)300 x 115 x 111 mm Net Weight1.1 kg Passive SubwooferType1 Way 1 Speaker Impedance3 Frequency Response40 - 1500 Hz Sound Pressure Level82 dB/W (1m) Ra

12、ted Input Power225 W Max. Input Power450 W Net Dimensions (W x H x D)236 x 435 x 391 mm Net Weight5.7 kg General Power supply110-240 V 50/60 Hz Power consumption130 W Net Weight4 kg External dimensions (W x H x D) 430 x 72 x 307 mm Operating conditionsTemperature: 5C to 35C,Operation status: Horizon

13、tal Operating humidity5% to 85% LaserSemiconductor laser,wavelength 650 nm CD/DVD Video systemNTSC Frequency 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

14、 position) (20 kHz LPF)* Video Video output1.0 V (p-p),75 ,negative sync.,RCA jack x 1 COMPONENT 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 1 HDMI OUT480p/720p/1080i/1080p Tuner (FM) Tuning Range87.5 - 108.0 MHz Intermediate Frequency10.7 MHz

15、 Signal-to Noise Ratio60 dB (Mono)* Frequency Response140 - 10000 Hz* Amplifier 1-4 (No.MB672) Items with * are measured at Front Speaker Terminals in STEREO mode Designs and specifications are subject to change without notice. Surround mode (* Depending on the sound mode settings and the source the

16、re may be no sound output.) Front: 155 W + 155 W (THD 10 %) center*: 155 W Surround*: 155 W + 155 W (4 at 1 kHz,THD 10 %) Subwoofer*: 225 W (3 at 70 Hz,THD 10 %) InputsAUDIO IN,OPTICAL IN,AUX IN OutputsMONITOR OUT,HDMI OUT,COMPONENT VIDEO OUT Speakers Front/Rear SpeakerType1 Way 1 Speaker Impedance4

17、 Frequency Response120 - 20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Power155 W Max. Input Power310 W Net Dimensions (W x H x D)117 x 210 x 111 mm Net Weight0.9 kg center speakerType1 Way 1 Speaker Impedance4 Frequency Response120 -20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Powe

18、r155 W Max. Input Power310 W Net Dimensions (W x H x D)300 x 115 x 111 mm Net Weight1.1 kg Passive SubwooferType1 Way 1 Speaker Impedance3 Frequency Response40 - 1500 Hz Sound Pressure Level82 dB/W (1m) Rated Input Power225 W Max. Input Power450 W Net Dimensions (W x H x D)236 x 435 x 391 mm Net Wei

19、ght5.7 kg (No.MB672)1-5 TH-G30 General Power supplyRefer to main label. Power consumptionRefer to main label. Net Weight4 kg External dimensions (W x H x D)430 x 72 x 307 mm Operating conditionsTemperature: 5C to 35C Operation status: Horizontal Operating humidity5% to 85% LaserSemiconductor laser,

20、wavelength 650 nm CD/DVD Video systemNTSC Frequency 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) * Video Video output1.0 V (p-p

21、) 75 negative sync. RCA jack x 1 COMPONENT 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 1 HDMI OUT480p/720p/1080i/1080p Tuner (FM) Tuning Range87.5 - 108.0 MHz Intermediate Frequency10.7 MHz Signal-to Noise Ratio60 dB (Mono) * Frequency Respons

22、e140 - 10,000 Hz * Amplifier Stereo 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 W Surround*: 155 W + 155 W (4 at 1 kHz THD 10 %) Subwoofer*: 225 W (3 at 70 Hz

23、 THD 10 %) InputsAUDIO IN, OPTICAL IN, AUX IN OutputsMONITOR OUT HDMI OUT COMPONENT VIDEO OUT Speakers Front/Rear SpeakerType1 Way 1 Speaker Impedance4 Frequency Response120 - 20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Power155 W Max. Input Power310 W Net Dimensions (W x H x D)117 x 210 x

24、 111 mm Net Weight0.9 kg 1-6 (No.MB672) Items with * are measured at Front Speaker Terminals in STEREO mode Designs and specifications are subject to change without notice. center speakerType1 Way 1 Speaker Impedance4 Frequency Response120 -20000 Hz Sound Pressure Level83 dB/W (1m) Rated Input Power

25、155 W Max. Input Power310 W Net Dimensions (W x H x D)300 x 115 x 111 mm Net Weight1.1 kg Passive SubwooferType1 Way 1 Speaker Impedance3 Frequency Response40 - 1500 Hz Sound Pressure Level82 dB/W (1m) Rated Input Power225 W Max. Input Power450 W Net Dimensions (W x H x D)236 x 435 x 391 mm Net Weig

26、ht5.7 kg (No.MB672)1-7 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and components specially for safety purpos- es. For continued protection, no changes should be made to the original design unless authorized in writing by the

27、 manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be per- formed by qualified personnel 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 al

28、terations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These characteris-

29、tics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Ser- vic

30、e Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety charac- teristics as the recommended replacement parts shown in the Parts List

31、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 the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire ha

32、zard. 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, after reassem- bling. (5) Leakage shock hazard testing After reassembling the product, always perform an isola- tion check on the exposed metal p

33、arts of the product (an- tenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product 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

34、. Using a Leakage Current Tester, measure the leakage current from each exposed metal parts of the cabinet, particular- ly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug th

35、e AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled 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 re

36、sistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any mus

37、t not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1.2Warning (1) This equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (3) Repairs must

38、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 voltage selector is provided, check setting for local voltage. 1.3Caution Burrs formed during molding may be left over on some parts of the chass

39、is. Therefore, pay attention to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety 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 ( ), d

40、iode ( ) and ICP ( ) or identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version) Good earth ground Place this probe on each exposed metal pa

41、rt. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-8 (No.MB672) 1.5Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit

42、(optical pickup). Take care to prevent this when performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static 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 repair

43、s are being performed. (1) Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. (2) Ground yourself Use an anti-static wrist strap to release any static electricity built

44、 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 optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) Do not u

45、se 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. 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

46、. (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. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to

47、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. 1.7Attention when traverse unit is decomposed *Please refer to Disassembly method in the text

48、 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 wire is disconnected without applying solder, the pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the s

49、hort land sections after connecting the card wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Solder short land section (No.MB672)1-9 1.8Important for laser products 1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not 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 d