JVC-MXKB30-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB157 2004/2 COMPACT COMPONENT SYSTEM MB15720042 MX-KB30 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 Area Suffix J - U.S.A. C - Canada FM MODEFM /AM AUX SLEEP STANDBY/ON CD1CD2CD3 SOUND MODE ACTIVE BASS EX. SOUND TURBO FADE MUTING VOLUME PROGRAM/RANDOMREPEAT TAPE A/B TAPE CD CA-MXKB30SP-MXKB30SP-MXKB30 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB157) SPECIFICATION Design and specifications are subject to change without notice. AmplifierOutput Power150 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 : 300 mV/50 k Speaker terminals6 - 16 Phones32 - 1 k 15 mW/ch output into 32 63 Hz - 12 500 Hz Cassette DeckFrequency Response Type I (NORMAL) 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 UnitDimensions267 mm 305 mm 433 mm (W/H/D) (10-9/16 12-1/16 17-1/16) MassApprox. 8.7 kg (19.2 lbs) Speaker Specifications (each unit) SP-MXKB303-way bass-reflex type TypeWoofer: 16 cm (6-5/16) cone 1 Speaker UnitMid: 5cm (2) cone 1 Tweeter: 2 cm (13/16) dome 1 Power Handling Capacity150 W Impedance6 Frequency Range45 Hz - 22,000 Hz Sound pressure level87 dB/Wm Dimensions244 mm 321 mm 258 mm (W/H/D) (9-5/8 12-11/16 10-3/16) MassApprox. 3.6 kg (8.0 lbs) Power SpecificationsPower RequirementsAC 120 V , 60 Hz Power Consumption135 W (power on mode) 18 W (in Standby mode) RadioFans.CN 收音机爱 好者资料库 (No.MB157)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.MB157) 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 CD players. 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 CD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector on the CD servo board. (If the flexible wire is disconnected without applying solder, the CD 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 Soldering Flexible cable CD changer unit (No.MB157)1-5 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 3.15A/250V for F951 and 1.6A/250V for F952. This symbol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F951 comme le meme type que 3.15A/250V, et 1.6A/250V pour F952. Ce sont des fusibles suretes qui functionnes rapide. 1-6 (No.MB157) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB157)1-7 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure, remove the top cover. (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(F952) 1.6A 250V Fuse(F951) 3.15A 250V A B 1-8 (No.MB157) 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 C C Right Front panel assemblyLeft Front panel assembly D DD D (No.MB157)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 removing the CD tray panel, it is still recommended to remove it in order to prevent damage. From the front panel side of this set, push in the sections marked with arrows and pull out the CD tray toward the front. Remove the CD tray panel by pushing both of its extremities upward in the direction of the arrows. 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 three 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 E F Antenna terminal Accessory terminal CD changer unit G 1-10 (No.MB157) 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 connectors CN701, CN101 on the power amp. board. (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 retaining the panel front from the bottom and then remove then GND lug b that comes from the power amp and supply PCB. (4) Disengage the claws c on both sides of the front panel assembly and then remove the assembly.Fig.10 Fig.11 ? Power amp and supply PCB I Claw cGND lug b (No.MB157)1-11 3.1.7Removing the CD 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 CD 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 removed. (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 CD PCB JJ J CD PCB CN601 Short round 1-12 (No.MB157) 3.1.8Removing the CD changer mechanism assembly (See Fig.14 to 15) Prior to performing the following procedures, remove the top cover. 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 mechanism assembly. (2) Removing four screws e retaining the CD mechanism holder 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 CD changer unit d e (Silver color) CD changer mechanism assembly e (Silver color) e (copper color) e (copper color) (No.MB157)1-13 3.1.9Removing 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 3.1.10 Replacing 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 3.1.11 Replacing the CD turn table and removing the motor (See Fig. 18) Prior to p