JVC-THM303-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.MB184 2004/3 DVD DIGITAL THEATER SYSTEM MB18420043 TH-M303, TH-M301 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . 1-33 Area suffix J - U.S.A. C - Canada Area suffix J - U.S.A. TH-M303 TH-M301 1-2 (No.MB184) SPECIFICATION Center unit (XV-THM606/XV-THM603/XV-THM505/XV-THM501/ XV-THM303/XV-THM301) *1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency

5、- 32 kHz, 44.1 kHz, 48 kHz) Subwoofer (SP-PWM603/SP-PWM303/SP-PWM301) *3: For SP-PWM301 Front speakers (SP-THM303F) Surround speakers (SP-THM303S) Center Speaker (SP-THM303C) Designs & specifications are subject to change without notice. Audio sectionTotal Harmonic Distortion0.02% NOTEThis value is

6、measured at System cord CONNECTOR for reference. Digital input *1DIGITAL IN (DBS) (OPTICAL): -21 dBm to -15 dBm (660 nm E30 nm) Video sectionVideo SystemNTSC 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:0.286 V(

7、p-p)/75 Component-Y:1.0 V(p-p)/75 Component-PB/PR:0.7 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:0.286 V(p-p)/75 Tuner sectionTuning RangeFM:87.5 MHz to 108.0 MHz AM:530 kHz to 1 710 kHz Power RequirementsAC 120 V, 60 Hz GeneralPowe

8、r Consumption18 W (at operation) 2.0 W (in standby mode) Dimensions (W H D)400 mm 85 mm 380 mm (15-3/4 inches 3-3/8 inches 15 inches) Mass4.3 kg (9.5 lbs) Amplifier section Front/Center/Surround115 W (100 W *3) per channel, RMS at 4 (Center/Surround)/ 125 W (115 W *3) per channel, RMS at 4 (Front) a

9、t 1 kHz, with 10 % total harmonic distortion. Subwoofer125 W (120 W *3), RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker section Speaker unit16 cm (6-5/16 inches) Bass-reflex, Magnetically Shielded Frequency Range30 Hz to 200 Hz GeneralPower RequirementsAC 120 V, 60 Hz Power Consump

10、tion125 W (at operation) 0 W (in standby mode) Dimensions (W H D)168.5 mm 412 mm 444 mm (6-11/16 inches 16-1/4 inches 17-1/2 inches) Mass12.0 kg (26.5 lbs) Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range90 Hz to 20 kHz Dimensi

11、ons (W H D)106 mm 119.5 mm 102 mm (4-3/16 inches 4-3/4 inches 4-1/16 inches) Mass0.69 kg (1.6 lbs) Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range80 Hz to 20 kHz Dimensions (W H D)111.5 mm 139 mm 106.5 mm (4-7/16 inches 5-1/2

12、inches 4-1/4 inches) Mass0.63 kg (1.4 lbs) Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range90 Hz to 20 kHz Dimensions (W H D)106 mm 119.5 mm 102 mm (4-3/16 inches 4-3/4 inches 4-1/16 inches) Mass0.69 kg (1.6 lbs) (No.MB184)1-3

13、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 the manufacturer. Replacem

14、ent 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 alterations or additions

15、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- tics are often not evid

16、ent 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- vice Manual. Electrical co

17、mponents 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 of Service Manual may c

18、reate 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 hazard. When service is r

19、equired, 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 parts of the product (an

20、- 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 outlet. Using a Leakage Curre

21、nt 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 the AC line cord directly

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

23、ter. Move the resistor connection to each expo sed 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 must not exceed 0.75 V AC (

24、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 be made in accordance wi

25、th 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 chassis. Therefore, pay atten

26、tion to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety In regard with compon ent 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 ( ), diode ( ) and ICP ( ) or

27、 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 part. AC VOLTMETER (Havin

28、g 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-4 (No.MB184) 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 (optical pickup). Take

29、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 repairs are being performed.

30、(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 up in your body. (3) H

31、andling 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 use a tester to check th

32、e 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. (2) Cut off the short

33、ed 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 the connector. (3) Hand

34、le 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 for the pickup unit. A

35、pply 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 from the short land secti

36、ons after connecting the flexible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Short circuit points (No.MB184)1-5 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 1.

37、6A/125V for F901, 6.3A/125V for F101, 8A/125V for F153 and F154. This symbol 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/125 pour F101, et 8A/125V pour F153 et F154. Ce sont des fusib

38、les suretes qui functionnes rapide. 1.6A-125V F901 6.3A-125V F101 8A-125VF154 8A-125VF153 RY101 CN101 CN102 XV-THM303/XV-THM301SP-PWM303/SP-PWM301 1-6 (No.MB184) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB184)1-7 SECTION 3 DISAS

39、SEMBLY 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 attaching the metal cover. (See Fig.3) (3) L

40、ift 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 inside the main body when releasing the

41、 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 1-8 (No.MB184) 3.1.2Removing 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 th

42、e main body, disconnect the parallel wires from the con nectors (CN456, CN457) on the main board. (See Fig.5) (2) Disconnect the card wires from the con nectors (CN450, CN460) on the main board. (See Fig.5) (3) Remove the screw C attaching the earth wire to the main board. (See Fig.5) Reference: Whe

43、n 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 assembly in the direction of the arrow

44、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 (No.MB184)1-9 3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Prior to performin

45、g the following procedures, remove metal cover and front panel assembly. (1) From the top side of the main body, disconnect the card wires from the connectors (CN401 to CN403) on the main board. Reference: When connecting the card wires, connect them to the connectors (CN401 to CN403) on the main bo

46、ard after passing the card wires through the hole d on the main board. (2) Remove the four screws E attaching the DVD changer mechanism assembly on the bottom chassis. (3) Take out the DVD changer mechanism assembly in the up- ward direction. Reference: When attaching the DVD changer mechanism assem

47、bly, align the holes of the DVD changer mechanism assembly to the pro- jections e 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 F and twelve screws

48、G attaching the rear panel. Fig.8 Main board CN402 Bottom chassis DVD changer mechanism assembly Card wires E E E Projections e Hole d CN401CN403 FG G Rear panel 1-10 (No.MB184) 3.1.5Removing the audio & digital input board (See Figs.9 and 10) Prior to performing the following procedures, remove the

49、 metal cover. (1) From the top side of the main body, disconnect the card wires from the con nectors (CN411, CN412) on the main board. (See Fig.9) (2) Remove the screw H attaching the audio & digital input board to the bracket(DSP). (See Fig.9) (3) From the back side of the main body, remove the screw J and two screws K attaching the audio & digital input board to the rear panel. (See Fig.10) (4) Take out the audio & digital input