JVC-THM505-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.MB192 2004/5 DVD DIGITAL THEATER SYSTEM MB19220045 TH-M505, TH-M501 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

3、. . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . 1-34 Area suffix J - U.S.A. Area suffix J - U.S.A. C - Canada TH-M501 TH-M505 (SP-THM505C, SP-THM303C) (SP-THM505F, SP-THM303F) (SP-THM505S, SP-THM303S) (SP-PWM505, SP-PWM501) (XV-THM505, XV-THM501) RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB192) SPECIFICATION Center unit (XV-THM606/XV-TH

5、M603/XV-THM505/XV-THM501/ XV-THM303/XV-THM301) *1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz) Subwoofer (SP-PWM603/SP-PWM505/SP-PWM501) *2: For SP-PWM501 Front speakers (SP-THM505F) Surround speakers (SP-THM505S) Center S

6、peaker (SP-THM505C) Designs & specifications are subject to change without notice. Audio sectionTotal Harmonic Distortion0.02% NOTE:This value is measured at System cord CONNECTOR for reference. Digital input *1DIGITAL IN (DBS) (OPTICAL) : -21 dBm to -15 dBm (660 nm E30 nm) Video sectionVideo System

7、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:0.286 V(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)/7

8、5 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 GeneralPower 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) Amplifier section F

9、ront/Center/Surround140 W (80 W *2) per channel, RMS at 4 (Center/Surround)/ 140 W (120 W *2) per channel, RMS at 4 (Front) at 1 kHz, with 10 % total harmonic distortion. Subwoofer300 W , RMS at 4 at 100 Hz, with 10 % total harmonic distortion. Speaker section Speaker unit25 cm (9-7/8 inches) Bass-r

10、eflex, Magnetically Shielded Frequency Range20 Hz to 200 Hz GeneralPower RequirementsAC 120 V, 60 Hz Power Consumption155 W (at operation) 0 W (in standby mode) Dimensions (W H D)256 mm 482 mm 460 mm (10-1/8 inches x 19 inches x 18-1/8 inches) Mass18.5 kg (41 lbs) SpeakersWoofer8.0 cm (3-3/16 inches

11、) Tweeter1.5 cm (5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity140 W Impedance4 Frequency Range90 Hz to 20 kHz Dimensions (W H D)104.5 mm 139 mm 101 mm (4-1/8 inches 5-1/2 inches 4 inches) Mass0.7 kg (1.6 lbs) Speakers8.0 cm (3-3/16 inches) Bass-reflex, Magnetically Shielded

12、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 inches 4-1/4 inches) Mass0.52 kg (1.2 lbs) SpeakersWoofer8.0 cm (3-3/16 inches) Tweeter1.5 cm (5/8 inches) Bass-reflex, Magnetically Shielded Power Handling Capacity

13、140 W Impedance4 Frequency Range90 Hz to 20 kHz Dimensions (W H D)137 mm 105 mm 104.5 mm (5-7/16 inches 4-3/16 inches 4-1/8 inches) Mass0.7 kg (1.6 lbs) RadioFans.CN 收音机爱 好者资料库 (No.MB192)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many

14、 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. Replacement parts must be identical to those used in the original circuits. Services should be per- formed by qualifi

15、ed 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 will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal

16、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 evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replace

17、ment 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 components having such features are identified by shading on the schematics and by ( ) on the Parts List in the

18、 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 create shock, fire, or other hazards. (4) The leads in the products are routed and dressed with ties, clamps,

19、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 required, the original lead routing and dress should be observed, and it should be confirmed that they have be

20、en 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- tenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the pr

21、oduct 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 Current Tester, measure the leakage current from each exposed metal parts of the cabinet, particular- ly any expos

22、ed 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 into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner.

23、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 voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a re

24、turn 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 (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1.2Warning (1) This equipment has been designed and manufactu

25、red 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 with the relevant safety standards. (4) It is essential that safety critical components are replaced by approved

26、 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 attention to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety In regard w

27、ith component 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 identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the sa

28、me 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 (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-4 (No.MB192) 1.5Preventing static electricity

29、 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 performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static el

30、ectricity 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. (1) Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an

31、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 to maintain quality during transport and before installation, both sides of

32、 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 optical pickup. The testers internal power source can easily destroy the

33、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 shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, ref

34、er 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 may break when subjected to strong force. (4) I t is not possible to adju

35、st 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. Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo

36、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 sections after connecting the flexible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti

37、-static wrist strap Short circuit points (No.MB192)1-5 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 1.6A/125V for F901. This symbol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, r

38、emplacez le fusible de surete de F901 comme le meme type que 1.6A/125V. Ce sont des fusibles suretes qui functionnes rapide. Power board 1.6A-125V F901 1-6 (No.MB192) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB192)1-7 SECTION 3

39、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 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)

40、(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 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 releasin

41、g 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 1-8 (No.MB192) 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

42、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 connectors (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:

43、When 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 arr

44、ow 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.MB192)1-9 3.1.3Removing the DVD changer mechanism assembly (See Fig.7) Prior to perfor

45、ming 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

46、 board 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 as

47、sembly, 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 scre

48、ws 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.MB192) 3.1.5Removing the audio & digital input board (See Figs.9 and 10) Prior to performing the following procedures, remove

49、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 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 boar