JVC-DXT7-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB368 2005/5 COMPACT COMPONENT SYSTEM DX-T9,DX-T7,DX-T5 Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61 (CA DXT5)(SP XST5)(SP XT5)(SP XT5)(SP XST5)(CA DXT7,CA DXT9) DX-T9, DX-T7 Area suffix A Australia US Singapore UW Brazil,Mexico,Peru UX Saudi Arabia UG Turkey,South Africa,Egypt UN Asean US Singapore UW Brazil,Mexico,Peru UX Saudi Arabia UY Argentina UG Turkey,South Africa,Egypt UN Asean DX-T5 Area suffix DX T9 DX T7 DX T5 Main body CA DXT9 CA DXT7 CA DXT5 Front speaker SP XT9 SP XT7 SP XT5 Subwoofer SP WT9 SP WT7 Surround speaker SP XST9 SP XST7 SP XST5 Center speaker SP XCT9 SP XCT7 SP XCT5 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB368) SPECIFICATION CA-DXT9 *1: Measured at 1 kHz, with tape recording signal 300 mV Amplifier sectionOutput PowerFRONT SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. CENTER SPEAKER140 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion. SURROUND SPEAKERS140 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion. SUBWOOFERS150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Digital outputOPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm 30 nm) Audio input sensitivity/ Impedance*1 AUX300 mV/47 k MIC 1/23.0 mV/50 k VIDEO OUTColor systemNTSC/PAL selectable VIDEO (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 Terminals4 - 16 (front speakers/subwoofers) 6 - 16 (surround/center speakers) Tuner sectionFM tuning range87.50 MHz - 108.00 MHz AM (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/SVCD CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD formats and MP3/WMA/JPEG files) DVD-R (recorded in DVD Video format) DVD-RW (recorded in DVD Video format or DVD-VR format) DVD-RAM (recorded in DVD-VR format) Dynamic range80 dB Horizontal resolution500 lines Wow and flutterImmeasurable Cassette deck section Frequency response Normal (type I)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240 V , (adjustable with the voltage selector), 50 Hz / 60 Hz Power consumption335 W (at operation) 29 W (on standby) Dimensions (W/H/D) (approx.)185 mm 460 mm 361 mm Mass (approx.)11.4 kg RadioFans.CN 收音机爱 好者资料库 (No.MB368)1-3 CA-DXT7 *1: Measured at 1 kHz, with tape recording signal 300 mV Amplifier sectionOutput PowerFRONT SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. CENTER SPEAKER50 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion. SURROUND SPEAKERS50 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distortion. SUBWOOFERS150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Digital outputOPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm 30 nm) Audio input sensitivity/ Impedance*1 AUX300 mV/47 k MIC 1/23.0 mV/50 k VIDEO OUTColor systemNTSC/PAL selectable VIDEO (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 Terminals4 - 16 (front speakers/subwoofers) 6 - 16 (surround/center speakers) Tuner sectionFM tuning range87.50 MHz - 108.00 MHz AM (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/SVCD CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD formats and MP3/WMA/JPEG files) DVD-R (recorded in DVD Video format) DVD-RW (recorded in DVD Video format or DVD-VR format) DVD-RAM (recorded in DVD-VR format) Dynamic range80 dB Horizontal resolution500 lines Wow and flutterImmeasurable Cassette deck section Frequency response Normal (type l)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240 V , (adjustable with the voltage selector), 50 Hz / 60 Hz Power consumption270 W (at operation) 25 W (on standby) Dimensions (W/H/D) (approx.)185 mm 460 mm 361 mm Mass (approx.)11.4 kg 1-4 (No.MB368) DX-T5 *1: Measured at 1 kHz, with tape recording signal 300 mV Amplifier sectionOutput PowerMAIN SPEAKERS150 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Digital outputOPTICAL DIGITAL OUTPUT -21 dBm to -15 dBm (660 nm 30 nm) Audio input sensitivity/ Impedance*1 AUX300 mV/47 k MIC 1/23.0 mV/50 k VIDEO OUTColor systemNTSC/PAL selectable VIDEO (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 Terminals4 - 16 (Main speakers) 6 - 16 (Surround speakers) Tuner sectionFM tuning range87.50 MHz - 108.00 MHz AM (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/SVCD CD-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD formats and MP3/WMA/JPEG files) DVD-R (recorded in DVD Video format) DVD-RW (recorded in DVD Video format or DVD-VR format) DVD-RAM (recorded in DVD-VR format) Dynamic range80 dB Horizontal resolution500 lines Wow and flutterImmeasurable Cassette deck section Frequency response Normal (type I)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 110 V / AC 127 V / AC 220 V / AC 230 V - AC 240 V , (adjustable with the voltage selector), 50 Hz / 60 Hz Power consumption195 W (at operation) 20 W (on standby) Dimensions (W/H/D) (approx.)185 mm 460 mm 361 mm Mass (approx.)10.9 kg (No.MB368)1-5 Speakers Design and specifications are subject to change without notice. Main SpeakersType3-Way 3-Speaker Bass Reflex (Magnetically-Shielded Type) Speaker systemsWoofer18 cm cone 1 Mid5 cm cone 1 Tweeter2 cm dome 1 Power handling capacity150 W Impedance4 Frequency range37 Hz - 31 000 Hz Sound pressure level85 dB/Wm Dimensions (W/H/D) (approx.) 204 mm 460 mm 271 mm Mass (approx.)4.6 kg each Surround Speakers Speaker systems8 cm cone 1 Power handling capacity40 W Impedance16 Dimensions (W/H/D) (approx.) 105 mm 230 mm 125 mm Mass (approx.)0.7 kg each 1-6 (No.MB368) 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. 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 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 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. 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 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, 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 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- 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 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- 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 capacitor between an ex- posed 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 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 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 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 with 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 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 (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE (No.MB368)1-7 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 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. (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) 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 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) 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-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 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. 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 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 1-8 (No.MB368) 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 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 w