JVC-THC3-ddcs-sm维修电路原理图.pdf

《JVC-THC3-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-THC3-ddcs-sm维修电路原理图.pdf（36页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB420 2005/7 DVD DIGITAL CINEMA SYSTEM MB42020057 TH-C3 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-THC3 SP-THC3F SP-PWC3 SP-THC3S SP-THC3C Area suffix UW - Brazil,Mexico,Peru UY - Argentina UJ - U.S.Military RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB420) SPECIFICATION Center unit (XV-THC3) *1: This va

5、lue is measured at System 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) Subwoofer (SP-PWC3) Audio sectionTotal Harmonic Distortion*10.02% Digital input*2DIGITAL IN (DBS): -21 dBm to -15 dBm (

6、OPTICAL: 660 nm 30 nm) Video sectionVideo SystemPAL/NTSC Horizontal Resolution500 lines Signal-to-Noise Ratio64 dB Video output levelComposite: 1.0 V(p-p)/75 S-video-Y: 1.0 V(p-p)/75 S-video-C: For PAL: 0.3 V(p-p)/75 S-video-C: For NTSC: 0.286 V(p-p)/75 Component-Y: 1.0 V(p-p)/75 Component-PB/PR: 0.

7、7 V(p-p)/75 Video input sensitivity/Impedance (VCR IN)Composite: 1.0 V(p-p)/75 S-video-Y: 1.0 V(p-p)/75 S-video-C: For PAL: 0.3 V(p-p)/75 S-video-C: For NTSC: 0.286 V(p-p)/75 Tuner sectionTuning RangeFM87.5 MHz to 108.0 MHz AM531 kHz to 1 710 kHz (at 9 kHz channel spacing) 530 kHz to 1 710 kHz (at 1

8、0 kHz channel spacing) For Middle East531 kHz to 1 602 kHz (at 9 kHz channel spacing) 530 kHz to 1 600 kHz (at 10 kHz channel spacing) GeneralPower RequirementsAC 110-240 V , 50/60 Hz Power Consumption19 W (at operation) 1.9 W (in standby mode) Dimensions (W H D)400 mm 85 mm 399 mm Mass4.2 kg (9.3 l

9、bs) Amplifier sectionFront140W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion. Center/Surround130W per channel, RMS at 4 at 1 kHz, with 10 % total harmonic distortion. Subwoofer140 W, RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker sectionSpeaker unit16 cm Bass-

10、reflex Power Handling Capacity140 W Impedance4 Frequency Range30 Hz to 200 Hz GeneralPower RequirementsAC 110 V/ AC 127 V/AC 220-240 V , 50/60 Hz Power Consumption135 W (at operation) 0 W (in standby mode) Dimensions (W H D)169 mm 411 mm 451 mm Mass11.3 kg RadioFans.CN 收音机爱 好者资料库 (No.MB420)1-3 Satel

11、lite Speakers (SP-XTHC3) Designs & specifications are subject to change without notice. Front speakers (SP-THC3F)Speaker unit8.0 cm 1.5 cm Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range80 Hz to 20 kHz Dimensions (W H D)104.5 mm 139 mm 101 mm Mass0.56 kg ea

12、ch Center speaker (SP-THC3C)Speaker unit8.0 cm 1.5 cm Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range80 Hz to 20 kHz Dimensions (W H D)137 mm 105 mm 104.5 mm Mass0.57 kg (1.3 lbs) Surround speakers (SP-THC3S)Speaker unit8.0 cm Bass-reflex Power Handling Cap

13、acity140 W Impedance4 Frequency Range80 Hz to 20 kHz Dimensions (W H D)111.5 mm 148 mm 106.5 mm Mass0.56 kg each 1-4 (No.MB420) 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 c

14、ontinued protection, no changes 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 o

15、f the product should not be 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 electri

16、cal and mechanical parts in 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. Repla

17、cement parts which have these 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

18、 not have the same safety 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,

19、 high temperature parts, 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 reassem- bling. (5) Leakage shock

20、hazard testing After reassembling 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

21、not use a line isolation transformer 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 g

22、ood earth ground. Any leakage 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 capa

23、citor between an exposed 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

24、 resistor. Now, reverse 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

25、 responsibility of the repairer 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 settin

26、g for local voltage. 1.3Caution 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 (

27、parts side) of the PWB diagrams, 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 regu

28、lation dose not Except the J and C version) 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.MB420)1-5 1.5Preventing static electricity Electrostatic discharge (ESD), which occurs when static electri

29、city 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 performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser

30、 diode) in devices such as laser products. 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 pic

31、kup) 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 to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted.

32、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 optical pickup. The testers internal power source can easily destroy the laser diode. 1.6Handling the traverse unit (optical pickup) (1)

33、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 nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-sta

34、tic 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 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

35、turn it. 1.7Attention when traverse 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 so

36、lder, the pickup may be destroyed by 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 a

37、ssembly Connector Short land section 1-6 (No.MB420) 1.8Important 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 disass

38、emble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The CD,MD and DVD 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

39、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 of procedures other than those specified here in may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABELS

40、 CAUTION : Visible and Invisible laser radiation 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 al

41、ttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt steen kohdistumista suoraan itseesi. (f) ADVARSEL : Synlig 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

42、an adjustment or operation check. CLASS 1 LASER PRODUCT CAUTION : Visible and Invisible laser radiation 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 : Avatt

43、aessa ja suojalukitus ohitettuna tai viallisena olet alttiina nkyvlle ja nkymttmlle lasersteilylle. Vlt 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.MB420)1

44、-7 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-8 (No.MB420) 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

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

46、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 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.MB420)1-9 3.1.2R

47、emoving 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

48、connectors (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 attac

49、hing the 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 wires CN450 Card wire D Joint cJoint bJoint b Front panel assembly 1-10 (No.MB420) 3.1.3R