JVC-MXGB5-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB160 2004/5 COMPACT COMPONENT SYSTEM MB16020045 MX-GB6, MX-GB5 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36 SP-MXGB6SP-MXGB6 SP-MXGB5SP-MXGB5 CA-MXGB6 CA-MXGB5 J - - - - - - - - - - - - - - - - - - - - - - - - - - - - - U.S.A. C - - - - - - - - - - - - - - - - - - - - - - - - - - Canada Area suffix RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB160) SPECIFICATION Amplifier section-CA-MXGB6 Speaker section-SP-MXGB6 Design and specifications are subject to change without notice. Output Power SUBWOOFERS170 W per channel, min. RMS, driven into 6 at 63 Hz with no more than 10% total harmonic distortion. MAIN SPEAKERS80 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Audio input sensitivity/Impedance (at 1 kHz, measured at MAIN SPEAKERS) AUX:400 mV/50 k Speakers/Impedance Subwoofers6 - 16 Main speakers4 - 8 TunerFM tuning range87.50 MHz - 108.00 MHz AM tuning range530 kHz - 1 710 kHz CD playerCD Capacity3 CDs Dynamic range85 dB Signal-to-noise ratio85 dB Cassette deck Frequency response Normal (type I)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 120 V , 60 Hz Power consumption230 W (at operation) 23.8 W (on standby) Dimensions (approx.)270 mm 317 mm 480 mm (W/H/D) (10 11/16 in. 12 1/2 in. 18 15/16 in.) Mass (approx.)10.5 kg (23.2 lbs) Type3-way bass-reflex type Speaker unitsSubwoofer20 cm (7 7/8 in.) cone 1 Main Woofer12 cm (4 3/4 in.) cone 1 Tweeter5 cm (2 in.) cone 1 Power handling capacitySubwoofer170 W Main speaker80 W ImpedanceSubwoofer6 Main speaker4 Frequency rangeSubwoofer25 Hz - 100 Hz Main speaker100 Hz - 20 000 Hz Sound pressure levelSubwoofer75 dB/Wm Main speaker82 dB/Wm Dimensions (approx.)233 mm 456 mm 360 mm (W/H/D) (9 3/16 in. 18 in. 14 3/16 in.) Mass (approx.)6.6 kg (14.6 lbs) each RadioFans.CN 收音机爱 好者资料库 (No.MB160)1-3 Amplifier section-CA-MXGB5 Speaker section-SP-MXGB5 Design and specifications are subject to change without notice. Output Power SUBWOOFERS160 W per channel, min. RMS, driven into 6 at 63 Hz with no more than 10% total harmonic distortion. MAIN SPEAKERS70 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Audio input sensitivity/Impedance (at 1 kHz, measured at MAIN SPEAKERS) AUX:400 mV/50 k Speakers/Impedance Subwoofers6 - 16 Main speakers4 - 8 TunerFM tuning range87.50 MHz - 108.00 MHz AM tuning range530 kHz - 1 710 kHz CD playerCD Capacity3 CDs Dynamic range85 dB Signal-to-noise ratio85 dB Cassette deck Frequency response Normal (type I)50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) GeneralPower requirementAC 120 V , 60 Hz Power consumption220 W (at operation) 23.3 W (on standby) Dimensions (approx.)270 mm 317 mm 480 mm (W/H/D) (10 11/16 in. 12 1/2 in. 18 15/16 in.) Mass (approx.)10 kg (22.1 lbs) Type4-way bass-reflex type Speaker unitsSubwoofer16 cm (6 5/16 in.) cone 1 Main Woofer16 cm (6 5/16 in.) cone 1 Tweeter2 cm (13/16 in.) dome 1 Midrange5 cm (2 in.) cone 1 Tweeter2 cm (13/16 in.) dome 1 Power handling capacitySubwoofer160 W Main speaker70 W ImpedanceSubwoofer6 Main speaker4 Frequency rangeSubwoofer25 Hz - 90 Hz Main speaker90 Hz - 20 000 Hz Sound pressure levelSubwoofer75 dB/Wm Main speaker86 dB/Wm Dimensions (approx.)302.5 mm 325.5 mm 345 mm (W/H/D) (11 15/16 in. 12 7/8 in. 13 5/8 in.) Mass (approx.)6.6 kg (14.6 lbs) each 1-4 (No.MB160) 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 exposed 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.MB160)1-5 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 Pickup unit connector Card wire Pickup unit connector Short land section Card wire Pickup 1-6 (No.MB160) 1.8Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 5 A/250 VGB5 (6.3 A/250 VGB6) for RFS2, 6.3 A/250 VGB5 (8 A/250 VGB6) for RFS5 and RFS6, 8 A/250 V for RFS7 and RFS8, 5 A/250 V for RFS9. This symbol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, remplacez le fusible de surete de RFS2 comme le meme type que 5 A/250 VGB5(6.3 A/250 VGB6), 6,3 A/250 VGB5(8 A/250 VGB6) pour RFS5 et RFS6, 8 A/250 V pour RFS7 et RFS8, et 5 A/250 V pour RFS9. Ce sont des fusibles suretes qui functionnes rapide. (No.MB160)1-7 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-8 (No.MB160) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the top cabinet (See Figs.1 to 3) (1) From the back side of the main body, remove the three screws A attaching the top cabinet. (See Fig.1.) (2) From the both sides of the main body, remove the six screws B attaching the top cabinet. (See Figs.2 and 3.) (3) Remove the top cabinet from the main body while lifting the rear section of the top cabinet in the direction of the arrow. (See Figs.2 and 3.) Fig.1 Fig.2 Fig.3 Top cabinet A AA Top cabinet B B Top cabinet B B (No.MB160)1-9 3.1.2Removing the CD changer mechanism assembly (See Figs.4 to 10) Prior to performing the following procedures, remove the top cabinet. (1) From the bottom side of the CD changer mechanism as- sembly, turn the gear cam in the direction of the arrow and draw the tray disc out of the CD changer mechanism as- sembly in the direction of the arrow 1. (See Figs.4 and 5.) (2) Remove the CD door assembly from the tray disc in the di- rection of the arrow 2 and push in the tray disc. (See Fig.5.) (3) From the left side of the main body, remove the spacers fix- ing the wire. (See Fig.5.) (4) From the right side of the main body, disconnect the wire from the connector CW104 on the main board. (See Fig.6.) (5) Disconnect the card wire from the connector CW105 on the CD sub board. (See Fig.6.) (6) From the back side of the main body, remove the five screws C attaching the heat sink cover. (See Fig.7.) Reference: It is not necessary to disconnect the wire of the fan mo- tor. (See Fig.8.) (7) Remove the two screws D attaching the CD changer mech- anism assembly. (See Fig.8.) (8) From the both sides of the main body, remove the two screws E attaching the CD changer mechanism assembly. (See Figs.9 and 10.) (9) Take out the CD changer mechanism assembly in the di- rection of the arrow 2 while extending the rear cabinet in the direction of the arrow 1. (See Figs.9 and 10.) Fig.4 Fig.5 Fig.6 CD changer mechanism assembly Gear cam Tray disc CD door assembly CD changer mechanism assembly Spacers Wire 1 2 Card wire Wire CD sub board Main board CW105 CW104 1-10 (No.MB160) Fig.7 Fig.8 Fig.9 Fig.10 Heat sink cover C C C Wire D CD changer mechanism assembly Rear cabinet 1 2 E CD changer mechanism assembly Rear cabinet 1 2 E (No.MB160)1-11 3.1.3Removing the front cabinet assembly (See Figs.11 to 14) Prior to performing the following procedures, remove the top cabinet and CD changer mechanism assembly. (1) From the forward side of the main board, disconnect the card wire from the connector CW101. (See Fig.11.) (2) Disconnect the wires from the connectors (CW01A, CW108, CW109, CW111, CW112) on the main board. (See Fig.11.) (3) From the top side of the main body, remove the screw F at- taching the earth wire. (See Fig.12.) (4) From the both sides of the main body, remove the two screws G attaching the front cabinet assembly. (See Figs.12 and 13