JVC-MXGA9V-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB011 2003/10 COMPACT COMPONENT SYSTEM MB01120039 MX-GA9V TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40 COMPACT DIGITAL VIDEO COMPACT DIGITAL AUDIO Area Suffix UX - Saudi Arabia UN - Asean U - Other Areas RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB011) SPECIFICATION Amplifier section Output PowerSUB WOOFERS88 W per channel, min. RMS, both channels driven into 6 at 63 Hz with no more than 0.9% total harmonic distortion. MAIN SPEAKERS28 W per channel, min. RMS, both channels driven into 6 at 1 kHz with no more than 0.9% total harmonic distortion. Audio input sensitivity/Impedance (Measured at 1 kHz, with tape recording signal 300 mV) AUX390 mV/50 k MIC 1/23.0 mV/5 k Digital outputCD OPTICAL DIGITAL OUTPUT Signal wave length660 nm Output level-15 dBm to -12 dBm Speakers/ImpedanceSUB WOOFERS6 - 16 MAIN SPEAKERS6 - 16 SURROUND SPEAKERS16 - 32 Tuner FM tuning range87.50 MHz - 108.00 MHz AM tuning rangeFor Saudi ArabiaAt 9 kHz intervals : 531 kHz - 1 602 kHz At 10 kHz intervals : 530 kHz - 1 600 kHz For other countriesAt 9 kHz intervals : 531 kHz - 1 710 kHz At 10 kHz intervals : 530 kHz - 1 710 kHz CD player CD capacity3 CDs Dynamic range85 dB Signal-to-noise ratio90 dB Wow and flutterImmeasurable Cassette deck Frequency responseNormal (type I)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) General Power 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 consumption170 W (at operation) 25 W (on standby) Dimensions (approx.)265 mm 335 mm 401 mm (W/H/D) (10 7/16 in. 13 1/4 in. 15 13/16 in.) Mass (approx.)10.0 kg (22.1 lbs) RadioFans.CN 收音机爱 好者资料库 (No.MB011)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.MB011) 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 CD changer mechanism assembly CD traverse unit Flexible cable (No.MB011)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 compact disc 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 de feated. 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 herein may result in hazardous radiation exposure. REPRODUCTION AND POSITION OF LABEL and PRINT WARNING LABEL and PRINT ! 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 1-6 (No.MB011) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB011)1-7 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the metal cover (See Fig.1 3) (1) Remove the six screws A on the back of the body. (2) Remove the two screws B on both sides of the body. (3) Remove the metal cover from the body by lifting the rear part of the cover. CAUTION: Do not break the front panel tab fitted to the metal cover. Fig.1 Fig.2 Fig.3 A AA Metal cover Metal cover B Metal cover B 1-8 (No.MB011) 3.1.2Removing the CD changer mechanism assembly (See Fig.4 6) Prior to performing the following procedure, remove the metal cover. (1) Disconnect the wire from connector CN705 on the amplifier board. (2) Remove the plastic rivet attaching the main board to the front assembly on the right side of the body. (3) Disconnect the card wire from connector CN661 on the main board. (4) Remove the two screws C on the upper side of the body and the two screws D on the back of the rear panel. (5) Pull both the rear panel and the front panel assembly to the outside, then remove the CD changer mechanism assem- bly by lifting the rear part of the assembly. REFERENCE: At this point, one card wire on the underside of the CD mechanism assembly is still connected. (6) Disconnect the card wire from connector CN504 on the in- ner side of the main board on the right side of the body. Re- move the CD mechanism assembly. CAUTION: To prevent damage to the CD fitting, be sure to pull both the rear panel and the front panel assembly enough to remove the CD changer mechanism assembly. Fig.4 Fig.5 Fig.6 3.1.3Removing the fan (See Fig.7) Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. (1) Turn over the CD changer mechanism assembly and re- move the two screws E attaching the fan. Fig.7 CD changer mechanism assembly Front panel assembly Amplifier board CN705 Rear panel Front panel assembly CC CD changer mechanism assembly Rear panel Main board CN661 CN504 CD changer mechanism assembly D Main board CN661 Front panel assembly Rear panel CN504 Plastic rivet Fan E E CD changer mechanism assembly (No.MB011)1-9 3.1.4Removing the front panel assembly (See Fig.8 11) Prior to performing the following procedure, remove the metal cover and CD changer mechanism assembly. (1) Disconnect the card wires from connector CN870, CN871 and CN315 on the main board respectively. (2) Remove the wire clamp and disconnect the wire from con- nector CN703 on the amplifier board. (3) Disconnect the wire from connector CN220 on the trans- former board. (4) Remove the four screws F on the bottom of the body. (5) Release the two joints a on the lower right and left sides of the body using a screwdriver, and remove the front panel assembly toward the front. Fig.8 Fig.9 Fig.10 Fig.11 3.1.5Removing the tuner board (See Fig.12) Prior to performing the following procedure, remove the metal cover. (1) Disconnect the card wire from connector CN1 on the tuner board on the right side of the body. (2) Remove the plastic rivet fixing the tuner board. (3) Remove the two screws G on the back of the body. Fig.12 Wire clampAmplifier board CN703 Main board CN870 CN871 CN315 Transformer board CN220 Front panel assembly F (Bottom)(Bottom)(Bottom) Joint a Front panel assembly Front panel assembly Joint a CN1 Plastic rivet Tuner board Rear panel G 1-10 (No.MB011) 3.1.6Removing the rear cover / rear panel (See Fig.13 16) Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. (1) Remove the screw H attaching the rear cover on the back of the body. (2) Push each tab of the four joints b in the direction of the ar- row and release. (3) Remove the sixteen screws G attaching the rear panel. (4) Disengage the joints c on each lower side of the rear panel using a screwdriver and remove the rear panel backward. Fig.13 Fig.14 Fig.15 Fig.16 Rear panelH Joint b Joint b Rear cover G Rear panel G G GG G Joint cRear panel Joint c Rear panel (No.MB011)1-11 3.1.7Removing the main board (See Fig.17 19) Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the rear panel and the antenna board. (1) Disconnect the card wires from con