JVC-MXKB4-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB196 2004/6 COMPACT COMPONENT SYSTEM MB19620045 MX-KB4 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 FM MODEFM /AM AUX SLEEP STANDBY/ON CD1CD2CD3 SOUND MODE RHYTHM AX FADE MUTING VOLUME PROGRAM/RANDOMREPEAT TAPEA CD TAPEB REMOTE CONTROL CA-MXKB4SP-MXKB4SP-MXKB4 Area suffix J - U.S.A. C - Canada RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB196) SPECIFICATION Design and specifications are subject to change without notice. AmplifierOutput Power180 W per channel, min. RMS, driven into 6 at 1kHz, with no more than 10% total harmonic distortion Input Sensitivity/Impedance (1 kHz) AUX IN:400 mV/50 k Speaker terminals6 - 16 Phones32 - 1 k Cassette DeckFrequency Response15 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 TunerTuning Range:87.5 MHz - 108.0 MHz AM TunerTuning Range:530 kHz - 1 710 kHz UnitDimensions270 mm 306 mm 456 mm (W/H/D) (10-11/16 12-1/16 18) MassApprox. 8.6 kg (19.0 lbs) Speaker Specifications SP-MXKB4 (each unit) Type3-way bass-reflex type Speaker UnitWoofer:20 cm (7-7/8) cone 1 Mid:5cm (2) cone 1 Tweeter:2 cm (13/16) dome 1 Power Handling Capacity180 W Impedance6 Frequency Range45 Hz - 22,000 Hz Sound pressure level87 dB/Wm Dimensions257 mm 321 mm 261 mm (W/H/D) (10-1/8 12-11/16 10-5/16) MassApprox. 4.9 kg (10.9 lbs) Power SpecificationsPower RequirementsAC 120 V , 60 Hz Power Consumption150 W (power on mode) 22 W (in Standby mode) RadioFans.CN 收音机爱 好者资料库 (No.MB196)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.MB196) 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 changer unit Soldering Flexible cable (No.MB196)1-5 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 3.5A/125V for F901 and 1.6A/250V for F902. 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 3.5A/125V et 1.6A/250V pour F902. Ce sont des fusibles suretes qui functionnes rapide. 1-6 (No.MB196) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB196)1-7 SECTION 3 DISASSEMBLY 3.1Disassembly of the main blocks of the set Replacement of the fuses and the power IC 3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure, remove the left side board. (1) Replace the fuses inside. Caution: Be sure to use fuses with the specified ratings. Fig.1 3.1.2Replacing the power IC (See Fig.2) Prior to performing the following procedure, remove the top cover. (1) Remove the two screws A from the heat sink between the power IC. (2) Remove the solder fixing the power IC. Fig.2 3.1.3Replacing the heat sink cover (See Fig.3) (1) Remove four screws B from the rear panel. (2) Pull the heat sink cover outward. Fig.3 Fuse (F901) 3.5A 125V Fuse (F902) 1.6A 250V W A B 1-8 (No.MB196) 3.1.4Removing the top cover (See Fig.4 and 5) (1) Remove six screws C that retain the top cover from the panel rear of the body. (2) Remove six screws D that retain the top cover from the two sides of the body. (3) Remove the top cover from the body by lifting it toward the rear. Fig.4 Fig.5 Top cover C CC Right Front panel assembly D D Left Front panel assembly D D (No.MB196)1-9 3.1.5Removing the CD changer unit (See Fig.6 to 9) Prior to performing the following procedures, remove the top cover. Caution: Although the CD mechanism unit can be removed without re- moving the CD tray panel, it is still recommended to remove it in order to prevent damage. a. From the front panel side of this set, push in the sections marked with arrows and pull out the CD tray toward the front. b. Remove the CD tray panel by pushing both of its extremi- ties upward in the direction of the arrows. c. Push the CD tray deep into the set. (1) Disconnect the cord wires from the CD board CN703 and CN203. (2) From the rear of the set, remove two screws E, two screws F and four screws G on the front panel left and right side. (3) Handle the CD changer unit rear, take out the unit. Fig.6 Fig.7 Fig.8 Fig.9 CD tray panel CD tray panel F Antenna terminal E G 1-10 (No.MB196) 3.1.6Removing the front panel assembly (See Fig.10 to 11) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. (1) Disconnect the parallel wire and the cord wire from the con- nectors CN701, CN101 on the power amp. PCB. (2) Remove one screws H retaining the front panel assembly onto the bottom of the body. (3) Remove two screws I on the left and right side of the set re- taining the panel front from the bottom and then remove then GND lug b that comes from the amp and supply board. (4) Disengage the claws c on both sides of the front panel as- sembly and then remove the assembly. Fig.10 Fig.11 H Claw GND lugGND lugab c (No.MB196)1-11 3.2Disassembly of units and assembly inside this set 3.2.1Removing the Main board (See Fig.12 to 13) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. (1) Disconnect the wires from CN603A, CN603B and CN604 on the Main board, which is located on the back side of the CD changer unit. (2) The four screws J that retain the CD board should be re- moved. (3) Remove the CD board by pulling it toward the side where the CN601 is located. (4) Using solder, short the CD pickup to connect to short round. Caution: After re-connecting the wires, be sure to remove the shorting solder from the GND connection. (5) Disconnect the card wire from the connector CN601 on the Main board and then remove the Main board. Fig.12 Fig.13 J PAIN PCBJ J CD PCB Short round CN601 1-12 (No.MB196) 3.2.2Removing the CD changer mechanism assembly (See Fig.14 to 15) Also remove the CD changer unit. (1) Turn the CD changer mechanism cover base and remove the screws d connecting the unit to the CD changer mech- anism assembly. (2) Removing four screws e retaining the CD mechanism hold- er assembly. Caution: When replacing the CD changer mechanism assembly, be sure not to mistake the positions of the silver color and copper color spring. Fig.14 Fig.15 d CD changer unit e ( Green color ) e ( Red color ) e ( Green color )e ( Red color ) CD changer mechanism assembly (No.MB196)1-13 3.2.3Removing the CD pickup (See Fig.16) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the CD changer mechanism. (1) Widen the section f. (2) While keeping the section f wide open, push the section g in the direction of the arrow to remove the shaft, and then remove the CD pickup. Fig.16 3.2.4Replacing the loading motor and rotor belt of the CD changer (See Fig .17) Prior to performing the following procedures, remove the top cover. Also open the CD changer tray. (1) Remove the two screws L retaining the CD changer tray loading motor. (2) Remove the two screws M retaining the gear plate and take it out, after remove the rotor belt from the pulley. Fig.17 3.2.5Replacing the CD turn table and removing the motor (See Fi