JVC-MXKB1-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.MB284 2004/8 COMPACT COMPONENT SYSTEM MB28420048 MX-KB2,MX-KB1 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31 Area suffix UW - Brazil,Mexico,Peru RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB284) SPECIFICATION Design and specifications are subject to change without notice. AmplifierOutput Power30 W per channel, min. RMS, driven into 6 at 1kHz, with no more than 10% total harmonic distortion (IEC 268-3) Input Sensitivity/Impedance (1 kHz) AUX IN:500 mV/51 k Speaker terminals6 - 16 Phones32 - 1 k Cassette Deck Section Frequency Response20 mW/ch output into 32 Type I (NORMAL)63 Hz - 12 500 Hz Wow And Flutter0.15 % (WRMS) CD PlayerCD Capacity3 CDs Dynamic Range85 dB Signal-To-Noise Ratio85 dB Wow And FlutterUnmeasurable TunerFM Tuner87.5 MHz - 108.0 MHz AM Tuner530 kHz - 1710 kHz (at AM10 kHz channel space) 531 kHz - 1710 kHz (at AM9 kHz channel space) UnitDimensions276 mm 315 mm 456 mm (W/H/D) MassApprox. 8 kg Speaker Specifications SP-MXKB2/SP- MXKB1 (each unit) Type2-way bass-reflex type Speaker UnitWoofer : 13 cm cone 1 Tweeter : 5cm cone 1 Power Handling Capacity30 W Impedance6 Frequency Range65 Hz - 20,000 Hz Sound pressure level86 dB/Wm Dimensions208 mm 323 mm 264 mm (W/H/D) Power SpecificationsPower RequirementsAC 110/127/220/230-240V , adjustable with voltage selector, 50/60 Hz Power Consumption83 W (power on mode) 13 W (in Standby mode) RadioFans.CN 收音机爱 好者资料库 (No.MB284)1-3 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 1-4 (No.MB284) 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 CD pickup board Short-circuit point Card wire (No.MB284)1-5 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 which prevent emission of radiation when the drawer is open and the safety interlocks have failed 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. REPRODUCTION AND POSITION OF LABELS 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 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) ! Please use enough caution not to see the beam directly or touch it in case of 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 : Avattaessa 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 1-6 (No.MB284) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB284)1-7 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the top cover / side cover (R) and (L) (See Fig.1 to 6) (1) From the back of the body, remove the two screws A at- taching the top cover. (2) From both sides of the body, remove the four screws B at- taching the top cover and the side cover (R) and (L). Move the top cover in the direction of the arrow to release from the front panel at the two joints a. (3) Remove the six screws D on the back of the body and the two screws E on the side of the body. Move the side cover (R) and (L) backward to release the four joints b on the bot- tom of the side covers. Fig.1 Fig.2 AA Top cover Top cover Front panel assembly Side cover (R) B a B 1-8 (No.MB284) Fig.3 Fig.4 Fig.5 Fig.6 DD Side cover (R)Side cover (L) Side cover (R) Front panel assembly E b E b Side cover (L)Front panel assembly Joint b (No.MB284)1-9 3.1.2Removing the CD fitting (See Fig.7 to 9) Prior to performing the following procedure, remove the top cover / side cover (R) and (L). Caution: For preventing from damage, make sure to remove the CD fit- ting before detaching the CD changer mechanism unit. (1) Push STANDBY / ON key to turn power on. (2) Push CD TRAY EJECT key. (3) Move the CD fitting in the direction of the arrow to release from the CD tray at two joints d. (4) Push STANDBY / ON key to close the tray. 3.1.3Removing the CD fitting (See Fig.8 to 10) Prior to performing the following procedure, remove the top cover / side cover(R) and (L). (1) Turn over the CD changer mechanism unit and turn the loading pulley gear at e in the inner part of the notch of the main board to move the CD tray forward. (2) Move the CD fitting in the direction of the arrow to release from the CD tray at two joint d. (3) Manually push and close the CD tray. Fig.7 Fig.8 Fig.9 Fig.10 CD TRAY EJECT STANDBY / ON CD fitting CD changer mechanism unit Front panel assembly d CD fitting CD tray CD tray e Main board CD changer mechanism Loading pullygear 1-10 (No.MB284) 3.1.4Removing the CD changer mechanism unit (See Fig.11 to 16) Prior to performing the following procedure, remove the top cover / side cover (R) and (L), and the CD fitting. (1) Disconnect the wire from connector CN601 on the turner board on the right side of the body. (2) Disconnect the wire from connector CN504 on the AUX board on the inner side of the front panel. (3) Disconnect the wire from connector CN801, CN802 and CN803 on the power board. (4) Disconnect the wire from connector CN100, CN101 and CN207 on the main board at the bottom of the CD changer mechanism unit, and disconnect the card wire from con- nector CN103. If necessary, release the band attaching the wires. (5) From the side of the body, remove the two screws F attach- ing the CD changer mechanism unit. (6) From the back of the body, remove the two screws G at- taching the CD changer mechanism unit. (7) Move the CD changer mechanism unit in the direction of the arrow while pulling the rear panel backward, and re- move the CD changer mechanism unit. Fig.11 Fig.12 Turner board CN601 AUX board CN504 Front panel assembly F CD changer mechanism unitRear panel Front panel assembly F CD changer mechanism unit Rear panel (No.MB284)1-11 Fig.13 Fig.14 Fig.15 Fig.16 AUX board CN504 Front panel assembly CN802 Power board CN803 CN801 CD changer mechanism unit CN207 CN101 CN100 CN103 Main board CD changer mechanism unit GG Rear