JVC-THM55-ddts-sch维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB075 2003/11 DVD DIGITAL THEATER SYSTEM MB075200310 TH-M55 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 J - U.S.A. C - Canada XV-THM55SP-PWM55 SP-THM55CSP-THM55F SP-THM55F SP-THM55F SP-THM55F RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB075) SPECIFICATION Design and specifications are subject to change without notice. Center unit Audio section Total Harmonic Distortion0.02% NOTE : Th

5、is value is measured at System cord CONNECTOR for reference. Audio input sensitivity/ Impedance (at 1 kHz) Analog inputAUDIO IN (VCR)290 mV/47 k Digital input*DIGITAL IN (DBS) (OPTICAL)-21 dBm to -15 dBm (660 nm 30 nm) * Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with samp

6、ling frequency - 32 kHz, 44.1 kHz, 48 kHz) Video section Color SystemNTSC 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(p-p)/75 Component-Y1.0 V(p-p)/75 Component-PB/PR0.7 V(p-p)/75 Video input sensitivity/

7、Impedance (VCR IN) Composite1.0 V(p-p)/75 S-video-Y1.0 V(p-p)/75 S-video-C0.286 V(p-p)/75 Tuner section Tuning RangeFM87.5 MHz to 108.0 MHz AM530 kHz to 1710 kHz General Power RequirementsAC 120 V, 60 Hz Power Consumption20 W (at operation), 1.0 W (in standby mode) Dimensions (W H D)400 mm 85 mm 386

8、 mm (15-3/4 inches 3-3/8 inches 15-1/14 inches) Mass4.6 kg (10.2 lbs) Subwoofer Amplifier section Front/Center/Surround100 W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion. Subwoofer120 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker section Speaker unit16 cm

9、 (6-5/16 inches) Bass-reflex, Magnetically Shielded Frequency Range30 Hz to 200 Hz General Power RequirementsAC 120 V, 60 Hz Power Consumption150 W (at operation), 0 W (in standby mode) Dimensions (W H D)216 mm 353 mm 485 mm (8-9/16 inches 13-15/16 inches 19-1/8 inches) Mass12.0 kg (26.5 lbs) Satell

10、ite Speaker SpeakersWoofer10.0 cm (3-15/16 inches) Tweeter4.0 cm (1-5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity100 W Impedance4 Frequency Range65 Hz to 20 kHz Dimensions (W H D)140 mm 228 mm 167 mm (5-9/16 inches 9 inches 6-5/8 inches) Mass1.9 kg (4.2 lbs) Center Speaker S

11、peakersWoofer8.0 cm (3-3/16 inches) 2 Tweeter4.0 cm (1-5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity100 W Impedance4 Frequency Range65 Hz to 20 kHz Dimensions (W H D)326 mm 119 mm 164 mm (12-7/8 inches 4-11/16 inches 6-1/2 inches) Mass2.4 kg (5.3 lbs) Accessories Remote cont

12、rol (1), Batteries (2), FM antenna (1), AM loop antenna (1), Power cord (1), System cord (1), Composite video cord (1) Speaker codes (1) 5 m (16 ft)For satellite (front left/right) and center speakers (3) 10 m (32 ft)For satellite speakers (surround left/right) (2) (The length of the above speaker c

13、ords are approximate.) RadioFans.CN 收音机爱 好者资料库 (No.MB075)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 changes should be made to the original desi

14、gn 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 be made. Any design alterations of the pro

15、duct 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 in the products have special safety-relate

16、d 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 these special safety characteristics are id

17、entified 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 charac- teristics as the recommended repl

18、acement 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, moving parts and/or sharp edges for the pr

19、evention 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 reassembling the product, always perform an is

20、ola- 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 transformer during this check. Plug the AC

21、 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 leakage cur- rent must not exceed 0.5mA AC (r

22、.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 metal part and a known good earth ground

23、. 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 the plug in the AC outlet and repeat each

24、 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 repairer to ensure that these safety stand

25、ards 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. 1.3Caution Burrs formed during molding may b

26、e 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 diagrams, the parts that are printed over

27、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 the J and C version) Good earth ground Pla

28、ce this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-4 (No.MB075) 1.5Preventing static electricity 1.5.1Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stor

29、ed in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.5.2About the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy the o

30、ptical 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 workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse

31、unit (optical pickup) on it. (2) Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 1.5.3Handling the optical pickup (1) In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optica

32、l pick- up are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) (2) Do not use 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. 1.5.4Handling the trave

33、rse unit (optical pickup) (1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) Remove solder of the short lands on the flexible wire after replacing the optical pickup. For specific details, refer to the replace- ment procedure in the text.

34、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 wire carefully as it may break when subjected to strong force. (4) It is not possible to adjust the semi-fixed resistor that adjusts the las

35、er power. Do not turn it. 1.5.5Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the DVD pickup. Apply solder to the short circuit points before the flexible wire is disconnected from the connector on the DVD pickup. (If the flexible wire is disconnected

36、without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short circuit points after connecting the flexible wire. Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap DVD pickup DVD changer m

37、echanism assembly Short circuit points (No.MB075)1-5 1.6Important for laser products 1.CLASS 1 LASER PRODUCT 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 disas

38、semble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is d

39、angerous 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 of procedures other than those specified herein may result in hazardous radiation exposure. ! Please use enough caution not to se

40、e the beam directly or touch it in case of an adjustment or operation check. 1-6 (No.MB075) 1.7Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 1.6A/125V for F901, 6.3A/125V for F101, 8A/125V for F153 and F154. This symb

41、ol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F901 comme le meme type que 1.6A/125V, et 6.3A/125V pour F101, et 8A/125V pour F153 et F154. Ce sont des fusibles suretes qui functionnes rapide. Power supply board (Forward side) F90

42、1 F101 Speaker terminal board (Forward side) F153 F154 Mother board (Forward side) (No.MB075)1-7 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-8 (No.MB075) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the metal cover (See F

43、igs.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, remove the three screws B attaching the metal cover. (See Fig.3.) (3) Lift the rear section of the metal cover in the direc

44、tion 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 damage any parts and boards inside the main body when releasing the joints a using a longer screwdriver. Fig.1 Fig.2 Fig.3

45、Fig.4 Metal cover A Metal cover A Metal cover Rear panel B Metal cover Claws aClaws a (No.MB075)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 b

46、oard. (See Fig.5.) (2) Disconnect the card wires from the connectors (CN407, CN412) on the main board. (See Fig.5.) (3) Remove the screw C attaching the earth wire to the main board. (See Fig.5.) (4) From the bottom side of the main body, remove the three screws D attaching the front panel assembly.

47、 (See Fig.6.) (5) Release the two hooks b and hook c from the both and bot- tom sides of the main body, and remove the front panel as- sembly in the direction of the arrow. (See Figs.5 and 6.) Fig.5 Fig.6 CN407 CN412 CN409 CN408 Hook bHook b Main board C Card wire Earth wire Parallel wires Front pan

48、el assembly Card wire Hook c Front panel assembly D 1-10 (No.MB075) 3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Remove the metal cover. Remove the front panel assembly. (1) From the top side of the main body, disconnect the card wires from the connectors (CN405, CN415) on the main b

49、oard. (2) Remove the four screws E attaching the DVD changer mechanism assembly to the bottom chassis. (3) Take out the DVD changer mechanism assembly in an up- ward direction. Note: When attaching the screw E, fit the hole of the DVD changer mechanism assembly to the bosses d on the bottom chassis. Fig.7 3.1.4Removing the rear panel (See Fig.8) Remove the metal cover. (1) From the back side of the main body, remove the screw F, nine screws G and three screws H attac