JVC-THC7-ddcs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB415 2005/7 DVD DIGITAL THEATER SYSTEM MB41520057 TH-C7 Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30 5TROUBLESHOOTING . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35 (XV-THC7) (SP-PWC7) (SP-THC7F) (SP-THC7C) (SP-THC5S) Area suffix J - U.S.A. RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB415) SPECIFICATION Center unit (XV-THC7) *1: This value is measured at System cord CONN

5、ECTOR for reference. *2: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz) Subwoofer (SP-PWC7) Audio section Total Harmonic Distortion *10.02% Digital input *2DIGITAL IN (DBS) (OPTICAL) - 21 dBm to - 15 dBm (660 nm 30 nm) Video s

6、ection Video 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/PR 0.7 V(p-p)/75 Video input sensitivity/ Impedance (VCR IN) Composite1.0 V(p-p)/75 S-video

7、-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 1 710 kHz GeneralPower RequirementsAC 120 V , 60 Hz Power Consumption16 W (at operation) 1.3 W (in standby mode) Dimensions (W H D)400 mm 85 mm 399 mm(15-3/4 inches 3-3/8 inches 15-3/4 inches) Mas

8、s4.2 kg (9.3 lbs) Amplifier sectionFront/Center/Surround167 W per channel, RMS at 3 at 1kHz, with 10 % total harmonic distortion. Subwoofer167 W, RMS at 3 at 100 Hz, with 10 % total harmonic distortion. Speaker sectionSpeaker unit25 cm (9-7/8 inches) Bass-reflex Power Handling Capacity170 W Impedanc

9、e3 Frequency Range25 Hz to 200 Hz GeneralPower RequirementsAC 120 V , 60 Hz Power Consumption160 W (at operation) 0 W (in standby mode) Dimensions (W H D)264 mm 481 mm 459 mm(10-7/16 inches 18-15/16 inches 18-1/8 inches) Mass16.5 kg (37 lbs) RadioFans.CN 收音机爱 好者资料库 (No.MB415)1-3 Satellite Speakers (

10、SP-XTHC7) Designs & specifications are subject to change without notice. Front speakers (SP-THC7F) Speaker unitWoofer10 cm (3-15/16 inches) 4 Tweeter4 cm (1-5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity 170 W Impedance3 Frequency Range60 Hz to 20 kHz Dimensions (W H D)270 mm

11、 1 085 mm 310 mm(10-11/16 inches 42-3/4 inches 12-1/4 inches) Mass8.8 kg (19.4 lbs) each Center speaker (SP-THC7C) Speaker unitWoofer10 cm (3-15/16 inches) 2 Tweeter4 cm (1-5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity 170 W Impedance3 Frequency Range65 Hz to 20 kHz Dimensio

12、ns (W H D)380 mm 141 mm 163 mm(15 inches 4-9/16 inches 6-7/16 inches) Mass3.4 kg (7.5 lbs) Surround speakers (SP-THC5S) Speaker unit8.0 cm (3-3/16 inches) Bass-reflex Power Handling Capacity 170 W Impedance3 Frequency Range80 Hz to 20 kHz Dimensions (W H D)111.5 mm 148 mm 106.5 mm(4-7/16 inches 5-7/

13、8 inches 4-1/4 inches) Mass0.44 kg (0.97 lbs) each RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB415) 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

14、 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 be made. Any

15、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 in the produc

16、ts 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 these special

17、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 charac- teri

18、stics 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, moving parts

19、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 reassembling the

20、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 transformer d

21、uring 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 leakage cur- ren

22、t 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 metal part

23、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 the plug in

24、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 repairer to e

25、nsure 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. 1.3Caution Burr

26、s 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 diagrams, the

27、 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 the J and C v

28、ersion) Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE (No.MB415)1-5 1.5Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc

29、. is discharged, can destroy the laser diode in the traverse unit (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 pro

30、ducts. 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 unit (optical pickup) on it. (2) Ground yourself Use

31、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 optical pickup are shorted. After replacement, return the shorte

32、d 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 testers internal power source can easily destroy the laser diode. 1.6Handling the traverse unit (optical pickup) (1) Do not subject the traverse unit (op

33、tical 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 the replacement procedure in the text. Remove the anti-static pin when replacing the traverse

34、unit. Be careful not to take too long a time 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. 1.7Attention when traverse

35、unit is decomposed *Please refer to Disassembly method in the text 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

36、 static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Card wire DVD pickup DVD changer mechanism assembly Connector Short land section

37、 1-6 (No.MB415) 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 1.6 A/125 V for F901, 8A/125V for F101,10 A/125 V for F153 and F154. This symbol specifies the type of fast operating fuse. Precaution: Pour la protecti

38、on continue contre les risques dincendie, remplacer uniquement par le meme type: fusible 1.6 A/125 V pour le F901, 8A/125V pour le F101,10 A/125 V pour le F153 et F154. Ce symbole specifie le type de fusible a action rapide. Power supply board (Center unit) Mother board (Subwoofer) (No.MB415)1-7 SEC

39、TION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-8 (No.MB415) 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

40、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 direction of the arrow while extending the lower sections of the metal cov- er, release the seven claws a using

41、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 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.MB415)1-9 3.1.2Removin

42、g the front panel assembly (See Figs. 5 and 6) Prior to performing the following procedures, remove the metal 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 connec

43、tors (CN450, CN460) on the main board. (See Fig. 5.) (3) Remove the screw C attaching the earth wires to the main board. (See Fig. 5.) Reference: When attaching the screw C, attach the earth wires with it. (See Fig. 5.) (4) From the bottom side of the main body, remove the three screws D attaching t

44、he front panel assembly. (See Fig. 6.) (5) From the both and bottom sides of the main body, remove the front panel assembly in the direction of the arrow while releasing the joints b and c. (See Fig. 6.) Fig.5 Fig.6 CN456Main board C Card wire CN460 Earth wires Front panel assembly CN457 Parallel wi

45、res CN450 Card wire D Joint cJoint bJoint b Front panel assembly 1-10 (No.MB415) 3.1.3Removing the DVD changer mechanism assembly (See Fig. 7) Prior to performing the following procedures, remove metal cover and front panel assembly. (1) From the top side of the main body, remove the screw E at- tac

46、hing the wire protection board to the main board. (2) Take out the wire protection board, and disconnect the card wires from the connectors (CN401 to CN403) on the main board. Reference: When attaching the wire protection board, attach the wire protection board after connecting the card wires to the

47、 connectors (CN401 to CN403) on the main board. (3) Remove the four screws F attaching the DVD changer mechanism assembly on the bottom chassis. (4) Take out the DVD changer mechanism assembly in the up- ward direction. Reference: When attaching the DVD changer mechanism assembly, align the holes of

48、 the DVD changer mechanism assembly to the pro- jections d on the bottom chassis. Fig.7 3.1.4Removing the rear panel (See Fig. 8) Prior to performing the following procedures, remove the metal cover. (1) From the back side of the main body, remove the screw G and eleven screws H attaching the rear p

49、anel. Fig.8 Main board CN402 Bottom chassis DVD changer mechanism assembly Card wires Wire protection board F F F Projections d CN401CN403 E G H Rear panel H (No.MB415)1-11 3.1.5Removing the audio & digital input board (See Figs. 9 and 10) Prior to performing the following procedures, remove the metal cover. (1) From the top side of the main body, disconnect the card wires from the connectors (CN411, CN412) on the main board. (See Fig. 9.) (2) Remove the screw J attaching the earth wires to