JVC-THM508-ddts-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.MB294 2004/7 DVD DIGITAL CINEMA SYSTEM MB29420047 TH-M508 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2、-4 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、1-8 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . 1-36 Area suffix US - Singapore UW - Brazil,Mexico,Peru UX - Saudi Arabia UG - Turkey,South Africa,Egypt UN - Asean (SP-THM508C) (SP-THM508F) (SP-THM505S) (SP-PWM508) (XV-THM508) RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB294) SPECIFICATION Center unit (XV-THM508) *1 : This value is measured at Sys

5、tem cord CONNECTOR for reference. *2 : Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz) *3 : For PAL system Subwoofer (SP-PWM508) Satellite Speakers-Front speakers (SP-THM508F) Audio section Digital input*2DIGITAL IN (DBS) (OPT

6、ICAL) -21 dBm to -15 dBm (660 nm E30 nm) Video section Video SystemNTSC/PAL selectable Horizontal Resolution500 lines Signal-to-Noise Ratio64 dB Video output levelComposite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V (0.3 V*3) (p-p)/75 Component-Y1.0 V(p-p)/75 Component-PB/PR0.7 V(p-p)/75 V

7、ideo input sensitivity/ Impedance (VCR IN) Composite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V (0.3 V*3) (p-p)/75 Tuner section Tuning RangeFM87.50 MHz to 108.00 MHz AM531 kHz to 1 602 kHz (at 9 kHz intervals) 530 kHz to 1 600 kHz (at 10 kHz intervals) GeneralPower RequirementsAC 110 - 24

8、0 V , 50/60 Hz (except for Australia) AC 240 V , 50 Hz (for Australia only) Power Consumption18 W (at operation) 2.0 W (in standby mode) Dimensions (W H D)400 mm 85 mm 380 mm Mass4.3 kg Amplifier section Front/Center/Surround140 W per channel, RMS at 4 (Center/Surround)/ 140 W per channel, RMS at 4

9、(Front) at 1 kHz, with 10 % total harmonic distortion. Subwoofer300 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker section Speaker unit25 cm Bass-reflex, Magnetically Shielded Frequency Range20 Hz to 200 Hz GeneralPower RequirementsAC 110 V/127 V/220 - 240 V selectable with the

10、voltage selector, 50 Hz/60 Hz Power Consumption170 W (at operation) 0 W (in standby mode) Dimensions (W H D) 256 mm 482 mm 460 mm Mass18.5 kg SpeakersWoofer10.0 cm 2 Tweeter4.0 cm, Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range60 Hz to 20 kHz Dimensions (W

11、 H D)250 mm 1065.5 mm 310 mm Mass7.2 kg RadioFans.CN 收音机爱 好者资料库 (No.MB294)1-3 Satellite Speakers-Surround speakers (SP-THM505S) Satellite Speakers-Center speaker (SP-THM508C) Designs & specifications are subject to change without notice. Speakers8.0 cm, Bass-reflex, Magnetically Shielded Power Handl

12、ing Capacity140 W Impedance4 Frequency Range80 Hz to 20 kHz Dimensions (W H D)111.5 mm 139 mm 106.5 mm Mass0.52 kg SpeakersWoofer8.0 cm 2 Tweeter4.0 cm, Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range65 Hz to 20 kHz Dimensions (W H D)326 mm 119 mm 170 mm Ma

13、ss2.5 kg 1-4 (No.MB294) 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 th

14、e 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 a

15、lterations 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-

16、 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- vi

17、ce 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

18、 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 h

19、azard. 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

20、parts 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 outle

21、t. 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 t

22、he 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 r

23、esistor 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 mu

24、st 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

25、 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 chas

26、sis. 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 ( ),

27、diode ( ) 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 p

28、art. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE (No.MB294)1-5 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

29、(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

30、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

31、 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

32、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

33、. (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

34、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

35、 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 flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder fr

36、om the short land sections after connecting the flexible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Traverse mechanism assembly Connector Short land sections Flexible wire Pickup 1-6 (No.MB294) 1.8Important for laser products 1.CLASS 1 LASER PROD

37、UCT 2.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 the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The CD,MD and DVD

38、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 are defeated. It is dangerous to defeat the safety switches. 5.CAUTION : If safety switches malfunction, the laser is able t

39、o 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 POSITION OF LABELS CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIREC

40、T EXPOSURE TO BEAM. (e) VARNING : Synlig och osynling laserstrlning nr den ppnas och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt steen kohdistumista suoraan itseesi. (f) ADVARSEL : Syn

41、lig og usynlig laserstrling nr maskinen er ben eller interlocken fejeler. Undg direkte eksponering til strling. (d) ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. CLASS 1 LASER PRODUCT CAUTION : Visible and Invisible laser radiation

42、when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e) VARNING : Synlig och osynling laserstrlning nr den ppnas och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt

43、steen kohdistumista suoraan itseesi. (f) ADVARSEL : Synlig og usynlig laserstrling nr maskinen er ben eller interlocken fejeler. Undg direkte eksponering til strling. (d) WARNING LABEL (No.MB294)1-7 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRU

44、CTIONS. 1-8 (No.MB294) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the metal cover (See Figs.1 to 4) (1) From the both sides of the main body, remove the four screws A attaching the metal cover. (See Figs.1 and 2) (2) From the back side of the main body, remove the three screws B attach

45、ing the metal cover. (See Fig.3) (3) Lift the rear section of the metal cover in the direction of the arrow while extending the lower sections of the metal cov- er, release the five claws a using a longer screwdriver from the inside as required. (See Fig.4) Note: Do not damage any parts and boards i

46、nside the main body when releasing the claws a using a longer screwdriver. Fig.1 Fig.2 Fig.3 Fig.4 Metal cover A Metal cover A Metal cover B Metal cover Claws aClaws a (No.MB294)1-9 3.1.2Removing the front panel assembly (See Figs.5 and 6) Prior to performing the following procedures, remove the met

47、al cover. (1) From the top side of the main body, disconnect the parallel wires from the connectors (CN456, CN457) on the main board. (See Fig.5) (2) Disconnect the card wires from the connectors (CN450, CN460) on the main board. (See Fig.5) (3) Remove the screw C attaching the earth wire to the mai

48、n board. (See Fig.5) Reference: When attaching the screw C, attach the earth wire with it. (See Fig.5) (4) From the bottom side of the main body, remove the three screws D attaching the front panel assembly. (See Fig.6) (5) From the both and bottom sides of the main body, remove the front panel asse

49、mbly in the direction of the arrow while releasing the joints b and c. (See Fig.6) Fig.5 Fig.6 CN460Main board C Card wire Earth wire Front panel assembly CN457 Parallel wires CN450CN456 Card wire D Joint cJoint bJoint b Front panel assembly 1-10 (No.MB294) 3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Prior to performing the following procedures,