JVC-DXT7-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB3682005/5COMPACT COMPONENT SYSTEMDX-T9,DX-T7,DX-T5Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-62SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-93DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-104ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-515TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61(CA DXT5)(SP XST5)(SP XT5)(SP XT5)(SP XST5)(CA DXT7,CA DXT9)DX-T9, DX-T7Area suffixA AustraliaUS SingaporeUW Brazil,Mexico,PeruUX Saudi ArabiaUG Turkey,South Africa,EgyptUN AseanUS SingaporeUW Brazil,Mexico,PeruU

5、X Saudi ArabiaUY ArgentinaUG Turkey,South Africa,EgyptUN AseanDX-T5Area suffixDX T9DX T7DX T5Main bodyCA DXT9CA DXT7CA DXT5Front speakerSP XT9SP XT7SP XT5SubwooferSP WT9SP WT7Surround speakerSP XST9SP XST7SP XST5Center speakerSP XCT9SP XCT7SP XCT5RadioFans.CN 收音机爱 好者资料库1-2 (No.MB368)SPECIFICATIONCA-

6、DXT9*1: Measured at 1 kHz, with tape recording signal 300 mVAmplifier sectionOutput PowerFRONT SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHzwith no more than 10% total harmonic distortion.CENTER SPEAKER140 W per channel, min. RMS, driven into 6 at 1 kHzwith no more than 10% total harmo

7、nic distortion.SURROUND SPEAKERS140 W per channel, min. RMS, driven into 6 at 1 kHzwith no more than 10% total harmonic distortion.SUBWOOFERS150 W per channel, min. RMS, driven into 4 at 1 kHzwith no more than 10% total harmonic distortion.Digital outputOPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660

8、 nm 30 nm)Audio input sensitivity/Impedance*1AUX300 mV/47 kMIC 1/23.0 mV/50 kVIDEO OUTColor systemNTSC/PAL selectableVIDEO (composite)1 V(p-p)/75 S-VIDEOY (luminance):1 V(p-p)/75 C (chrominance, burst):0.286 V(p-p)/75 COMPONENT (Interlace/Progressive)(Y):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 Speaker Ter

9、minals4 - 16 (front speakers/subwoofers)6 - 16 (surround/center speakers)Tuner sectionFM tuning range87.50 MHz - 108.00 MHzAM (MW) tuning range531 kHz - 1 602 kHz (at 9 kHz)530 kHz - 1 600 kHz (at 10 kHz)Disc player sectionPlayable discDVD Video/DVD Audio/CD/VCD/SVCDCD-R/CD-RW (recorded in Audio CD/

10、Video CD/SuperVideo CD formats and MP3/WMA/JPEG files)DVD-R (recorded in DVD Video format)DVD-RW (recorded in DVD Video format or DVD-VRformat)DVD-RAM (recorded in DVD-VR format)Dynamic range80 dBHorizontal resolution500 linesWow and flutterImmeasurableCassette deck section Frequency response Normal

11、 (type I)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240V , (adjustable with the voltage selector), 50 Hz / 60 HzPower consumption335 W (at operation)29 W (on standby)Dimensions (W/H/D) (approx.)185 mm 460 mm 361 mmMass (approx.)

12、11.4 kgRadioFans.CN 收音机爱 好者资料库(No.MB368)1-3CA-DXT7*1: Measured at 1 kHz, with tape recording signal 300 mVAmplifier sectionOutput PowerFRONT SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHzwith no more than 10% total harmonic distortion.CENTER SPEAKER50 W per channel, min. RMS, driven int

13、o 6 at 1 kHzwith no more than 10% total harmonic distortion.SURROUND SPEAKERS50 W per channel, min. RMS, driven into 6 at 1 kHzwith no more than 10% total harmonic distortion.SUBWOOFERS150 W per channel, min. RMS, driven into 4 at 1 kHzwith no more than 10% total harmonic distortion.Digital outputOP

14、TICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm 30 nm)Audio input sensitivity/Impedance*1AUX300 mV/47 kMIC 1/23.0 mV/50 kVIDEO OUTColor systemNTSC/PAL selectableVIDEO (composite)1 V(p-p)/75 S-VIDEOY (luminance):1 V(p-p)/75 C (chrominance, burst):0.286 V(p-p)/75 COMPONENT (Interlace/Progressive)(Y):1

15、 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 Speaker Terminals4 - 16 (front speakers/subwoofers)6 - 16 (surround/center speakers)Tuner sectionFM tuning range87.50 MHz - 108.00 MHzAM (MW) tuning range531 kHz - 1 602 kHz (at 9 kHz)530 kHz - 1 600 kHz (at 10 kHz)Disc player sectionPlayable discDVD Video/DVD Audio/

16、CD/VCD/SVCDCD-R/CD-RW (recorded in Audio CD/Video CD/SuperVideo CD formats and MP3/WMA/JPEG files)DVD-R (recorded in DVD Video format)DVD-RW (recorded in DVD Video format or DVD-VRformat)DVD-RAM (recorded in DVD-VR format)Dynamic range80 dBHorizontal resolution500 linesWow and flutterImmeasurableCas

17、sette deck section Frequency response Normal (type l)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240V , (adjustable with the voltage selector), 50 Hz / 60 HzPower consumption270 W (at operation)25 W (on standby)Dimensions (W/H/D)

18、 (approx.)185 mm 460 mm 361 mmMass (approx.)11.4 kg1-4 (No.MB368)DX-T5*1: Measured at 1 kHz, with tape recording signal 300 mVAmplifier sectionOutput PowerMAIN SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHzwith no more than 10% total harmonic distortion.Digital outputOPTICAL DIGITAL OUT

19、PUT -21 dBm to -15 dBm (660 nm 30 nm)Audio input sensitivity/Impedance*1AUX300 mV/47 kMIC 1/23.0 mV/50 kVIDEO OUTColor systemNTSC/PAL selectableVIDEO (composite)1 V(p-p)/75 S-VIDEOY (luminance):1 V(p-p)/75 C (chrominance, burst):0.286 V(p-p)/75 COMPONENT (Interlace/Progressive)(Y):1 V(p-p)/75 (PB/PR

20、):0.7 V(p-p)/75 Speaker Terminals4 - 16 (Main speakers)6 - 16 (Surround speakers)Tuner sectionFM tuning range87.50 MHz - 108.00 MHzAM (MW) tuning range531 kHz - 1 710 kHz (at 9 kHz)530 kHz - 1 710 kHz (at 10 kHz)Disc player sectionPlayable discDVD Video/DVD Audio/CD/VCD/SVCDCD-R/CD-RW (recorded in A

21、udio CD/Video CD/SuperVideo CD formats and MP3/WMA/JPEG files)DVD-R (recorded in DVD Video format)DVD-RW (recorded in DVD Video format or DVD-VRformat)DVD-RAM (recorded in DVD-VR format)Dynamic range80 dBHorizontal resolution500 linesWow and flutterImmeasurableCassette deck section Frequency respons

22、e Normal (type I)50 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240V , (adjustable with the voltage selector), 50 Hz / 60 HzPower consumption195 W (at operation)20 W (on standby)Dimensions (W/H/D) (approx.)185 mm 460 mm 361 mmMass (

23、approx.)10.9 kg(No.MB368)1-5SpeakersDesign and specifications are subject to change without notice.Main SpeakersType3-Way 3-Speaker Bass Reflex (Magnetically-Shielded Type)Speaker systemsWoofer18 cm cone 1Mid5 cm cone 1Tweeter2 cm dome 1Power handling capacity150 WImpedance4 Frequency range37 Hz - 3

24、1 000 HzSound pressure level85 dB/WmDimensions (W/H/D) (approx.) 204 mm 460 mm 271 mmMass (approx.)4.6 kg eachSurround Speakers Speaker systems8 cm cone 1Power handling capacity40 WImpedance16 Dimensions (W/H/D) (approx.) 105 mm 230 mm 125 mmMass (approx.)0.7 kg each1-6 (No.MB368)SECTION 1PRECAUTION

25、1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identica

26、l tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warr

27、anty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can th

28、eprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identifie

29、d by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The lead

30、s in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be

31、 observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter 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,headpho

32、ne jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure the leakage currentfrom each exposed metal pa

33、rts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or mor

34、e sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metalpart, particularly

35、 any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment ha

36、s been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components a

37、re replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4Critical parts for saf

38、etyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the mark nearby are criticalfor safety. When replacing them, be sure to use the parts

39、 of thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE(No.MB368)1-71.5Preventing static electricityEl

40、ectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laserdiode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.5.1 Grounding to prevent damage by static electricityStatic electric

41、ity 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 workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron pl

42、ate over it before placing thetraverse unit (optical pickup) on it.(2) Ground yourselfUse 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

43、 diode on the replacement opticalpickup 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 easilydestroy the laser diode.

44、 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, refer to therepl

45、acement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long atime 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-fix

46、ed 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 board. (If the fl

47、exiblewire 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.1MConductive material(conductive sheet) or iron palate(caption)Anti-static wrist strapCard

48、 wireDVD pickupDVD changer mechanism assemblyConnectorShort land section1-8 (No.MB368)1.8Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable parts insid

49、e theLaser Unit. Do not disassemble 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 f

50、ailed or are defeated. It is 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.REPRODUCT