JVC-THM45-ddcs-sm维修电路原理图.pdf

《JVC-THM45-ddcs-sm维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《JVC-THM45-ddcs-sm维修电路原理图.pdf（85页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB033 2003/11 DVD DIGITAL CINEMA SYSTEM MB033200310 TH-M45 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

4、 . . . . . 1-39 Area suffix B - U.K. E - Continental Europe EN - Northern Europe XV-THM45SP-PWM45 SP-THM45CSP-THM45FSP-THM45F SP-THM45SSP-THM45S RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB033) SPECIFICATION Design and specifications are subject to change without notice. Center unit Audio section Total Harmon

5、ic Distortion0.02% NOTE : This value is measured at System cord CONNECTOR for reference. Audio input sensitivity/ Impedance (at 1 kHz) Analog inputAUX IN290 mV/47 k Digital input*DIGITAL IN (OPTICAL)-21 dBm to -15 dBm (660 nm 30 nm) * Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surro

6、und (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz) Video section Color SystemPAL Horizontal Resolution500 lines Signal-to-Noise Ratio (Composite signal when RGB is selected) 64 dB Video output levelComposite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V(p-p)/75 Tuner section Tuning Rang

7、eFM87.5 MHz to 108.0 MHz AM (MW)522 kHz to 1629 kHz General Power RequirementsAC 230 V, 50 Hz Power Consumption20 W (at operation), 1.6 W (in standby mode) Dimensions (W H D)400 mm 85 mm 386 mm Mass4.6 kg Subwoofer Amplifier section Front/Center/Surround80 W per channel, RMS at 6 at 1 kHz, with 10 %

8、 total harmonic distortion. Subwoofer120 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker section Speaker unit16 cm Bass-reflex, Magnetically Shielded Frequency Range30 Hz to 200 Hz General Power RequirementsAC 230 V, 50 Hz Power Consumption150 W (at operation), 0 W (in standby mo

9、de) Dimensions (W H D)216 mm 353 mm 485 mm Mass12.0 kg Satellite Speakers Front speakers (SP-THM45F) Speakers8.0 cm Bass-reflex, Magnetically Shielded Power Handling Capacity80 W Impedance6 Frequency Range90 Hz to 20 kHz Dimensions (W H D)103 mm 115 mm 100 mm Mass0.64 kg Surround speakers (SP-THM45S

10、) Speakers8.0 cm Bass-reflex, Magnetically Shielded Power Handling Capacity80 W Impedance6 Frequency Range90 Hz to 20 kHz Dimensions (W H D)103 mm 115 mm 100 mm Mass0.52 kg Center speaker Speakers8.0 cm Bass-reflex, Magnetically Shielded Power Handling Capacity80 W Impedance6 Frequency Range90 Hz to

11、 20 kHz Dimensions (W H D)103 mm 115 mm 100 mm Mass0.64 kg Accessories Remote control (1), Batteries (2), FM antenna (1), AM (MW) loop antenna (1), Power cord (1), System cord (1) Speaker codes 5 mFor satellite (front left/right) and center speakers (3) 10 mFor satellite speakers (surround left/righ

12、t) (2) (The length of the above speaker cords are approximate.) RadioFans.CN 收音机爱 好者资料库 (No.MB033)1-3 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 ch

13、anges should be made to the original design unless authorized in writing by the 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 b

14、e made. Any design alterations of the product should not be made. Any design alterations 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 i

15、n the products have special safety-related characteristics. These characteris- 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 th

16、ese special safety characteristics are identified in the Parts List of Ser- vice 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

17、charac- teristics as the recommended replacement parts shown in the Parts List 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, m

18、oving parts and/or sharp edges for the prevention of electric shock and fire hazard. 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 reass

19、embling 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 product is safe to operate without danger of electrical shock.Do not use a line isolation t

20、ransformer during this check. Plug the AC line cord directly into the AC outlet. 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 leak

21、age cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug the 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

22、 metal part and a known good earth ground. Measure the AC voltage across the resistor 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

23、the plug in the AC outlet and repeat each measurement. Voltage measured any must 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 r

24、epairer to ensure that these safety standards are maintained. (3) Repairs must 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. 1.3

25、Caution Burrs formed during molding may be left over on some parts of the chassis. 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 d

26、iagrams, the parts that are printed over with black such as the resistor ( ), 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 t

27、he J and C version) Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 0.15 F AC TYPE 1-4 (No.MB033) 1.5 Safety Precautions (U.K only) (1) This design of this product contains special hardware and many circuits and components spe

28、cially for safety purposes. For con- tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace- ment parts must be identical to those used in the original circuits. (2) Any unauthorised design alterations or additions will void the

29、manufacturers guarantee; furthermore the manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom. (3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other

30、than those listed in the manual. Please note however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety c

31、haracteristics as the recommended replacement parts shown in the Parts List of the Service Manual and 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 par

32、ts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. 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 re-assembling. 1.5.1Warning (1) Service should be perfo

33、rmed by qualified personnel only. (2) This equipment has been designed and manufactured to meet international safety standards. (3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (4) Repairs must be made in accordance with the relevant safety sta

34、ndards. (5) It is essential that safety critical components are replaced by approved parts. (6) If mains voltage selector is provided, check setting for local voltage. Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of pre

35、forming repair of this system. (No.MB033)1-5 1.6Preventing 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 (optical pickup). Take care to prevent this when performi

36、ng repairs. 1.6.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbench Ground the w

37、orkbench 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 up in your body. (3) Handling the optical pickup In order t

38、o 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 use a tester to check the condition of the laser diode in the

39、 optical pickup. The testers internal power source can easily destroy the laser diode. 1.7Handling 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 n

40、ippers, 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 the connector. (3) Handle the flexible cable carefully as it

41、 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. 1.8Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the DVD pickup unit. Apply solder to the short circuit

42、points before the flexible wire is disconnected from the connector on the DVD pickup. (If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the fle

43、xible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap DVD pickup DVD changer mechanism assembly Short circuit points 1-6 (No.MB033) 1.9Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock f

44、ailed 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 compact disc player uses invisible laser radiation and is equipped with safety sw

45、itches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. 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

46、 of procedures other than those specified herein may result in hazardous radiation exposure. ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. (No.MB033)1-7 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe S

47、PECIFIC SERVICE INSTRUCTIONS. 1-8 (No.MB033) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the metal cover (See Figs.1 to 4) (1) From the right and left 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,

48、 remove the three screws B attaching 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 claws a using a longer screwdriver from the inside as required. (See Fig.4.) Note: Do not

49、 damage any parts and boards inside the main body when releasing the joints a using a longer screwdriver. Fig.1 Fig.2 Fig.3 Fig.4 Metal cover A Metal cover A Metal cover Rear panel B Metal cover Claws aClaws a (No.MB033)1-9 3.1.2Removing the front panel assembly (See Figs.5 and 6) Remove the metal cover. (1) From the top side of the main body, disconnect the parallel wires from the connectors (CN408, CN409) on the main board. (See Fig.5.) (2) Disconnect the card wires from