JVC-MXKC2-cs-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB434 2005/10 COMPACT COMPONENT SYSTEM MB434200510 MX-KC2 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 5TROUBLESHOOTING . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 CA-MXKC2SP-MXKC2SP-MXKC2 Area suffix UW - Brazil,Mexico,Peru UY - Argentina RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB434) SPECIFICATION Design and specifications are subject to change without notice. Amp

5、lifierOutput Power50 W per channel, min. RMS, driven into 6 at 1kHz, with no more than 10% total harmonic distortion. (IEC 268-3) Input Sensitivity/Impedance (1 kHz) AUX IN400 mV/50 k Speaker terminals6 - 16 Phones32 - 1 k 15 mW/ch output into 32 Cassette Deck SectionFrequency Response Type l (NORMA

6、L) 63 Hz - 12 500 Hz Wow And Flutter0.15% (WRMS) CD PlayerCD Capacity3 CDs Dynamic Range83 dB Signal-To-Noise Ratio85 dB Wow And FlutterUnmeasurable TunerFM Tuner : Tuning Range87.5 MHz - 108.0 MHz(at AM10 kHz channel space) 87.50 MHz - 108.00 MHz(at AM9 kHz channel space) AM Tuner : Tuning Range530

7、 kHz - 1710 kHz (at AM10 kHzchannel space) 531 kHz - 1710 kHz (at AM9 kHzchannel space) UnitDimensions270 mm 308 mm 410 mm (W/H/D) MassApprox. 6.5 kg Speaker Specifications (each unit) Type2-way bass-reflex type Speaker UnitWoofer : 13 cm cone 1 Tweeter : 5 cm cone 1 Power Handling Capacity50 W Impe

8、dance6 Frequency Range45 Hz - 22 000 Hz Sound pressure level87 dB/Wm Dimensions205 mm 308 mm 209 mm (W/H/D) MassApprox. 2.9 kg Power SpecificationsPower RequirementsAC 110 V - 127 V/220 V - 240 V , adjustable with voltage se- lector, 50 Hz/60 Hz Power Consumption110 W (power on mode) 13 W (in Standb

9、y mode) 1.2 W (in Eco mode) RadioFans.CN 收音机爱 好者资料库 (No.MB434)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

10、 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 th

11、e 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-r

12、elated 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 a

13、re 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

14、 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 t

15、he 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

16、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 t

17、he 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

18、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 g

19、round. 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

20、 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

21、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

22、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

23、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 groun

24、d 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.MB434) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB434)1-5 SECTION 3 DISASSEMBLY 3.1Disasse

25、mbly 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

26、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. (

27、2) Pull the heat sink cover outward. Fig.3 Fuse (F901) 1.6AL 250V W A B 1-6 (No.MB434) 3.1.4Removing the top cover right cabinet and left cabinet (See Fig.4 and 5) (1) Remove three screws C that retain the top cover from the panel rear of the body. (2) Remove six screws D that retain the left cabine

28、t from the body. (3) Remove six screws c that retain the right cabinet from the body. Fig.4 Fig.5 top cover right cabinet left cabinet C C D Right Front panel assembly C C Left Front panel assembly D C (No.MB434)1-7 3.1.5Removing the CD changer unit (See Fig.6 to 8) Prior to performing the following

29、 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. From the front panel side of this set, push in the sections marked with arrows and pull out the CD tray tow

30、ard 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, and four screws G on the front pan

31、el left and right side. (3) Handle the CD changer unit rear, take out the unit. Fig.6 Fig.7 Fig.8 UP UP CD tray panel E G 1-8 (No.MB434) 3.1.6Removing the front panel assembly (See Fig.9 to 10) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. (1) D

32、isconnect the parallel wire and the cord wire from the con- nectors 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 front cabinet and bottom cab- inet and then remove then GND lug b that come

33、s from the power amp and supply board. (4) Disengage the claws c on both sides of the front panel as- sembly and then remove the assembly. Fig.9 Fig.10 IH Claw c GND lug b GND lug a (No.MB434)1-9 3.2Disassembly of units and assembly inside this set 3.2.1Removing the Main board (See Fig.11 to 12) Pri

34、or 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

35、) 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 CN60

36、1 on the Main board and then remove the Main board. Fig.11 Fig.12 Main boardJ J J CD board Short round CN601 1-10 (No.MB434) 3.2.2Removing the CD changer mechanism assembly (See Fig.13 to 14) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. (1) Tur

37、n 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 si

38、lver color and copper color spring. Fig.13 Fig.14 d CD changer unit assembly e ( Green color ) e ( Red color ) e ( Green color )e ( Red color ) CD changer mechanism (No.MB434)1-11 3.2.3Removing the CD pickup (See Fig.15) Prior to performing the following procedures, remove the top cover. Also remove

39、 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.15 3.2.4Replacing the loading motor and rotor belt of the CD change

40、r (See Fig .16) 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 pulle

41、y. Fig.16 3.2.5Replacing the CD turn table and removing the motor (See Fig. 17) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. (1) Remove the one screw retaining the CD (Turn table). (2) Remove the two screws retaining the stopper brackets on bot

42、h sides of the CD changer unit. (3) Remove the stopper brackets from both sides of the CD changer unit. (4) Pull out the CD tray from the CD changer unit, all the way and lift the tray to remove. (5) Remove the gear and after push out the tray motor locker and pull out the tray motor from the CD tra

43、y. Fig.17 g f CD pickup Shaft M L Motor locker Turn table motor Obligue gear 1-12 (No.MB434) 3.2.6Removing the cassette deck mechanism (See Fig.18) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly. (1) Remove si

44、x screws retaining the cassette deck mecha- nism. Fig.18 3.2.7Removing the key open board & the key REC board (See Fig.19) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly. (1) Remove 25 screws P that retains th

45、e key open board. Fig.19 3.2.8Removing the display board (See Fig.20) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove the front panel assembly. (1) Remove 25 screws Q that retain the front board from the back of the front panel unit. F

46、ig.20 Front panelassembly Z Z Front panelassembly Front board P QDisplay board (No.MB434)1-13 3.2.9Removing the Switch board and sound mode and CD function switch board (See Fig.19 to 22) Prior to performing the following procedures, remove the top cover. Also remove the CD changer unit. Also remove

47、 the front panel assembly. (1) Pull out the volume control knob from the front of the front panel assembly.(Fig.21) (2) Remove six screws Q retaining the front panel assembly. (3) Remove the Control/FL board. (4) Remove eleven screws R retaining the Switch (key 1) board.(Fig.19) (5) Remove two screw

48、s S retaining the sound mode and CD function (key 2) switch board.(Fig.20) Fig.21 Fig.22 Volume knob Front panel assembly Front panel assembly Volum shaft 1-14 (No.MB434) 3.2.10 Removing the cassette deck main motor, and replacing the main belts (See Fig.18, 23 and 24) Prior to performing the follow

49、ing procedures, remove the top cover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly. (1) Remove six screws Z retaining the cassette deck mecha- nism. (Fig.18) (2) Remove the cassette deck mechanism. (3) Remove two screws t retaining the main motor from the front side of the cassette deck. Caution: After attaching the main motor, check the orientation of the motor and the polarity of the wires. (4) From the backside of the cassette deck, remove the m