JVC-MXC55J-cs-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2006 Victor Company of Japan, Limited No.MB508 2006/6 COMPACT COMPONENT SYSTEM MB50820066 MX-C55J,MX-C55C Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 5TROUBLESHOOTING . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 ECODISC SKIP SP-MXC55SP-MXC55CA-MXC55 RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB508) SPECIFICATION Design and specifications are subject to change without notice. Amplifier section CA-MXC55 Output

5、PowerSUBWOOFERS170 W per channel, min. RMS, driven into 3 at 63 Hz with no more than 10% total harmonic distor- tion MAIN SPEAKERS 80 W per channel, min. RMS, driven into 6 at 1 kHz with no more than 10% total harmonic distor- tion Audio input sensitivity/Impedance (at 1 kHz, measured at MAIN SPEAKE

6、RS) AUX400 mV/47 k USBUSB Version 1.1 Speakers/ImpedanceSubwoofers3 - 6 Main speakers6 - 16 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 GeneralPower requirementAC 120 V , 60 Hz Power consumption

7、80 W /136 VA (at operation) 7.3 W (on standby) 1 W (in ECO mode) Dimensions (approx.)270 mm 317 mm 402 mm (W/H/D) (10 11/16 in. 12 1/2 in. 15 7/8 in.) Mass (approx.)5.9 kg (13 lbs) Speaker section SP-MXC55 Type3-way bass-reflex type Speaker unitsSubwoofer16 cm (6 5/16 in.) cone 1 Main Woofer10 cm (3

8、 15/16 in.) cone 1 Tweeter5 cm (2 in.) cone 1 Power handling capacitySubwoofer170 W Main speaker80 W ImpedanceSubwoofer3 Main speaker6 Frequency rangeSubwoofer30 Hz - 1 000 Hz Main speaker100 Hz - 20 000 Hz Sound pressure levelSubwoofer74 dB/Wm Main speaker81 dB/Wm Dimensions (approx.)220 mm 435 mm

9、316 mm (W/H/D) (8 11/16 in. 17 13/16 in. 12 1/2 in.) Mass (approx.)5.7 kg (12.6 lbs) each RadioFans.CN 收音机爱 好者资料库 (No.MB508)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 c

10、ontinued 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 o

11、f 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 electri

12、cal 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. Repla

13、cement 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

14、 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,

15、 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

16、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

17、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 g

18、ood 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 capa

19、citor 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 t

20、he 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 leg

21、al 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 sett

22、ing 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

23、 (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 re

24、gulation 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.MB508) 1.5Important for laser products 1.CLASS 1 LASER PRODUCT 2.CAUTION : (For U.S.A.) Visible and/

25、or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments. 3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct

26、 exposure to beam. 4.CAUTION : This laser product uses visible and/or 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.CAU

27、TION : 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. ! Please use enough caution not to see the beam directly or touch it in case of a

28、n adjustment or operation check. (No.MB508)1-5 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-6 (No.MB508) SECTION 3 DISASSEMBLY 3.1Main body section 3.1.1Removing the top cabinet (See Figs.1 and 2) (1) From the both sides of the main b

29、ody, remove the six screws A attaching the top cabinet. (See Fig.1.) (2) From the back side of the main body, remove the three screws B attaching the top cabinet. (See Fig.2.) (3) Take out the top cabinet from the main body while lifting the rear section of the top cabinet in the direction of the ar

30、row. (See Fig.1.) 3.1.2Removing the CD deck assembly (See Figs.2 to 4) Remove the top cabinet. (1) From the back side of the main body, remove the two screws B attaching the CD deck assembly to the rear cab- inet. (See Fig.2.) (2) From the bottom side of the CD deck assembly, turn the gear cam in th

31、e direction of the arrow and draw the tray disc out of the CD deck assembly in the direction of the ar- row 1. (See Figs.3 and 4.) (3) Remove the CD door from the tray disc in the direction of the arrow 2. (See Fig.4.) (4) From the left side of the main body, disconnect the wire from the connector C

32、N103 on the main AMP board. (See Fig.4) (5) Disconnect the card wire from the connector CW105 on the CD board. (See Fig.4) (6) From the both sides of the main body, remove the two screws D and then take out the CD deck assembly from the main body. (See Fig.4.) Fig.1 Fig.2 Fig.3 Fig.4 Top cabinet A R

33、ear cabinet C B CD deck Gear cam OPEN Main AMP board D CD deck 2 CD board CD door Tray disk 1 CN103 CW105 (No.MB508)1-7 3.1.3Removing the main AMP board (See Figs.5 to 7) Remove the top cabinet and CD deck assembly. (1) From the right side of the main body, remove the screw E attaching the main AMP

34、board to the main body. (See Fig.5) (2) From the top side of the main body, disconnect the wire from the connector CN108 on the main AMP board. (See Fig.6.) (3) Disconnect the card wire from the connector CN101 on the main AMP board. (See Fig.6.) (4) Disconnect the wire from the connector CN102 on t

35、he main AMP board. (See Fig.6.) (5) Disconnect the wires from the connectors (SMCN01, SMCN02) on the SMPS board. (See Fig.6.) (6) From the back side of the main body, remove the three screws G attaching the main AMP board to the rear cabi- net. (See Fig.7.) (7) Take out the main AMP board from the b

36、ottom cabinet. 3.1.4Removing the SMPS board and rear cabinet (See Figs.6 to 8) Remove the top cabinet, CD deck assembly and main AMP board. (1) From the top side of the main body, remove the screw F at- taching the earth wire on the bottom cabinet. (See Fig.6.) (2) From the back side of the main bod

37、y, remove the three screws H attaching the rear cabinet. (See Fig.7.) (3) Remove the sections a toward this side and take out the rear cabinet. (See Fig.7.) (4) From the inside of the rear cabinet, remove the four screws M attaching the SMPS board. (See Fig.8.) (5) Release the claw b and take out th

38、e SMPS board from the rear cabinet assembly. (See Fig.8.) 3.1.5Removing the fan motor (See Figs.7 and 8) Remove the top cabinet, CD deck assembly and main AMP board. (1) From the back side of the main body, remove the two screws K attaching the fan motor to the rear cabinet. (See Fig.7.) (2) Take ou

39、t the fan motor from the rear cabinet. (See Fig.8.) Fig.5 Fig.6 Fig.7 Fig.8 Bottom cabinet Main AMP board E CN108 SMCN101 SMCN102 SMPS board Bottom cabinet Main AMP board CN101 F CN102 Rear cabinet G G H K H J a Rear cabinet SMPS board FAN motor M b b b M 1-8 (No.MB508) 3.1.6Removing the front cabin

40、et assembly (See Figs.9 to 11) Remove the top cabinet and CD deck assembly. (1) From the top side of the main body, remove the screw N at- taching the earth wire on the bottom cabinet. (See Fig.9.) (2) Disconnect the card wire from the connector CN101 on the main AMP board. (See Fig.10.) (3) Disconn

41、ect the wire from the connector CN102 on the main AMP board. (See Fig.10.) (4) From the both sides of the main body, remove the two screws P attaching the front cabinet assembly. (See Fig.11.) (5) From the both and bottom sides of the main body, release the joints (c, d) and then take out the front

42、cabinet assem- bly from the main body in the direction of the arrow. (See Figs.11.) Fig.9 Fig.10 Fig.11 N Front cabinet assembly Bottom cabinet Main AMP board CN101 CN102 Bottom cabinet P c d d Front cabinet assembly (No.MB508)1-9 3.1.7Removing the VFD board (See Figs.12 and 13) Remove the top cabin

43、et, CD deck assembly and front cabinet assembly. (1) From the front side of the front cabinet assembly, pull out the two knobs. (See Fig.12.) (2) From the inside of the front cabinet assembly, remove the seven screws Q attaching the VFD board. (See Fig.13.) (3) Take out the VFD board from the front

44、cabinet assembly and then disconnect the wires from the connectors (UW101, UW201, FW102, FW104) on the VFD board. . (See Fig.13.) 3.1.8Removing the front board (See Fig.12) Remove the top cabinet, CD deck assembly, front cabinet as- sembly and VFD board. (1) From the inside of the front cabinet asse

45、mbly, remove the four screws R attaching the front board. (2) Take out the front board from the front cabinet assembly. Fig.12 Fig.13 Front cabinet assembly Knob RR Q Front board VFD board FW104 FW102UW201UW101 1-10 (No.MB508) 3.1.9Removing the USB board (See Fig.14) Remove the top cabinet, CD deck

46、assembly, front cabinet as- sembly, Knobs and VFD board. (1) From the inside of the front cabinet assembly, remove the three screws S attaching the USB board. (2) Take out the USB board from the front cabinet assembly. 3.1.10 Removing the LED1 board, LED2 board and LED3 board (See Fig.14) Remove the

47、 top cabinet, CD deck assembly, front cabinet as- sembly, knobs and VFD board. (1) From the inside of the front cabinet assembly, release the claws e and then take out the LED1 board from the front cabinet assembly. (2) Remove the screw T attaching the LED2 board. (3) Release the claw f and then tak

48、e out the LED2 board from the front cabinet assembly. (4) Take out the LED3 board from the front cabinet assembly. Fig.14 SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. SSS T LED1 board USB board LED2 board LED3 board e f (No.MB508)1-11 SECTION 5 TROUBLESHOOTING 5.1Amplifier

49、5.1.1Power Malfunction 5.1.2No Output Front pcb u-com Vdd normal? SMPS pcb SMIC42 input voltage normal? check the SMIC01,SMD43 Check amp PCS wire CN107 Front pcb dose UX101(10MHz) oscillate? Front pcb p- sense voltage normal?(#82) Check the SMPS SMD44 Front pcb When the power on H pin no.94(UIC01) Replace u-COM IC (UIC01) CHECK the AMP PCB AIC01,FIC01,WIC01,WIC02 YES YES YES YES YES NO NONO NO NO Amp pcb AIC01,WIC01,02 pin No.4,7,12,15 B+ normal? Check the SMPS pcb SMIC02 check the SMIC01,SMd43 Check amp pcb wire CN107