JVC-MXKC2-cs-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4342005/10COMPACT COMPONENT SYSTEMMB434200510MX-KC2Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17CA-MXKC2SP-MXKC2SP-MXKC2Area suffixUW - Brazil,Mexico,PeruUY - ArgentinaRadioFans.CN 收音机爱 好者资料库1-2 (No.MB434)SPECIFICATIONDesign and specifications are subject to change without notice.AmplifierOutput Power50 W

5、 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 kSpeaker terminals6 - 16 Phones32 - 1 k15 mW/ch output into 32 Cassette Deck SectionFrequency Response Type l (NORMAL) 63 Hz - 12 500 HzWow And

6、 Flutter0.15% (WRMS)CD PlayerCD Capacity3 CDsDynamic Range83 dBSignal-To-Noise Ratio85 dBWow And FlutterUnmeasurableTunerFM 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 kHz - 1710 kHz (at AM10 kHzchannel

7、 space)531 kHz - 1710 kHz (at AM9 kHzchannel space)UnitDimensions270 mm 308 mm 410 mm (W/H/D)MassApprox. 6.5 kgSpeaker Specifications(each unit)Type2-way bass-reflex typeSpeaker UnitWoofer : 13 cm cone 1Tweeter : 5 cm cone 1Power Handling Capacity50 WImpedance6 Frequency Range45 Hz - 22 000 HzSound

8、pressure level87 dB/WmDimensions205 mm 308 mm 209 mm (W/H/D)MassApprox. 2.9 kgPower SpecificationsPower RequirementsAC 110 V - 127 V/220 V - 240 V , adjustable with voltage se-lector, 50 Hz/60 HzPower Consumption110 W (power on mode)13 W (in Standby mode)1.2 W (in Eco mode)RadioFans.CN 收音机爱 好者资料库(No

9、.MB434)1-3SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Repla

10、cement parts must be identical tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions wi

11、ll voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from

12、 visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components havi

13、ng such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire,

14、 orother hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original le

15、ad routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal

16、 cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure the leakage curr

17、entfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter

18、having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled 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 ACvoltmeter. Move the resistor connection to each ex

19、posed metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.

20、2Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that

21、 safety critical components are replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this sys

22、tem.1.4Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the mark nearby are criticalfor safety. When replacing t

23、hem, be sure to use the parts of thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB434)SECT

24、ION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB434)1-5SECTION 3DISASSEMBLY3.1Disassembly of the main blocks of the setReplacement of the fuses and the power IC3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure

25、, remove the leftside board.(1) Replace the fuses inside.Caution:Be sure to use fuses with the specified ratings.Fig.13.1.2Replacing the power IC (See Fig.2) Prior to performing the following procedure, remove the topcover.(1) Remove the two screws A from the heat sink between thepower IC.(2) Remove

26、 the solder fixing the power IC.Fig.23.1.3Replacing the heat sink cover (See Fig.3)(1) Remove four screws B from the rear panel.(2) Pull the heat sink cover outward.Fig.3Fuse (F901)1.6AL 250VWAB1-6 (No.MB434)3.1.4Removing the top cover right cabinet and left cabinet (See Fig.4 and 5)(1) Remove three

27、 screws C that retain the top cover from thepanel rear of the body.(2) Remove six screws D that retain the left cabinet from thebody.(3) Remove six screws c that retain the right cabinet from thebody.Fig.4Fig.5top coverright cabinetleft cabinetCCDRight Front panel assemblyCCLeft Front panel assembly

28、DC(No.MB434)1-73.1.5Removing the CD changer unit (See Fig.6 to 8) Prior to performing the following procedures, remove the topcover.Caution:Although the CD mechanism unit can be removed without re-moving the CD tray panel, it is still recommended to remove itin order to prevent damage. From the fron

29、t panel side of this set, push in the sectionsmarked with arrows and pull out the CD tray toward the front. Remove the CD tray panel by pushing both of its extremitiesupward in the direction of the arrows. Push the CD tray deep into the set.(1) Disconnect the cord wires from the CD board CN703 andCN

30、203.(2) From the rear of the set, remove two screws E, and fourscrews G on the front panel left and right side.(3) Handle the CD changer unit rear, take out the unit.Fig.6Fig.7Fig.8UPUPCD tray panelEG1-8 (No.MB434)3.1.6Removing the front panel assembly (See Fig.9 to 10) Prior to performing the follo

31、wing procedures, remove the topcover. Also remove the CD changer unit.(1) Disconnect 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 assemblyonto the bottom of the body.(3) Remove two screws I on the fron

32、t cabinet and bottom cab-inet and then remove then GND lug b that comes from thepower amp and supply board.(4) Disengage the claws c on both sides of the front panel as-sembly and then remove the assembly.Fig.9Fig.10IHClaw cGND lug bGND lug a(No.MB434)1-93.2Disassembly of units and assembly inside t

33、his set3.2.1Removing the Main board (See Fig.11 to 12) Prior to performing the following procedures, remove the topcover. Also remove the CD changer unit.(1) Disconnect the wires from CN603A, CN603B and CN604on the Main board, which is located on the back side of theCD changer unit.(2) The four scre

34、ws J that retain the CD board should be re-moved.(3) Remove the CD board by pulling it toward the side wherethe CN601 is located.(4) Using solder, short the CD pickup to connect to shortround.Caution:After re-connecting the wires, be sure to remove theshorting solder from the GND connection.(5) Disc

35、onnect the card wire from the connector CN601 on theMain board and then remove the Main board.Fig.11Fig.12Main boardJJJCD boardShort round CN6011-10 (No.MB434)3.2.2Removing the CD changer mechanism assembly (See Fig.13 to 14) Prior to performing the following procedures, remove the topcover. Also re

36、move the CD changer unit.(1) Turn the CD changer mechanism cover base and removethe 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, besure not to mistak

37、e the positions of the silver color and coppercolor spring.Fig.13Fig.14dCD changer unitassemblye ( Green color )e ( Red color )e ( Green color )e ( Red color )CD changermechanism(No.MB434)1-113.2.3Removing the CD pickup (See Fig.15) Prior to performing the following procedures, remove the topcover.

38、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 gin the direction of the arrow to remove the shaft, and thenremove the CD pickup.Fig.153.2.4Replacing the loading motor and rotor belt of the CD c

39、hanger (See Fig .16) Prior to performing the following procedures, remove the topcover. Also open the CD changer tray.(1) Remove the two screws L retaining the CD changer trayloading motor.(2) Remove the two screws M retaining the gear plate and takeit out, after remove the rotor belt from the pulle

40、y.Fig.163.2.5Replacing the CD turn table and removing the motor (See Fig. 17) Prior to performing the following procedures, remove the topcover. 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 onboth side

41、s of the CD changer unit.(3) Remove the stopper brackets from both sides of the CDchanger unit.(4) Pull out the CD tray from the CD changer unit, all the wayand lift the tray to remove.(5) Remove the gear and after push out the tray motor lockerand pull out the tray motor from the CD tray.Fig.17gfCD

42、 pickupShaftMLMotor lockerTurn table motorObligue gear1-12 (No.MB434)3.2.6Removing the cassette deck mechanism (See Fig.18) Prior to performing the following procedures, remove the topcover. Also remove the CD changer unit. Also remove the front panel assembly.(1) Remove six screws retaining the cas

43、sette deck mecha-nism.Fig.183.2.7Removing the key open board & the key REC board (See Fig.19) Prior to performing the following procedures, remove the topcover. Also remove the CD changer unit. Also remove the front panel assembly.(1) Remove 25 screws P that retains the key open board.Fig.193.2.8Rem

44、oving the display board (See Fig.20) Prior to performing the following procedures, remove the topcover. Also remove the CD changer unit. Also remove the front panel assembly.(1) Remove 25 screws Q that retain the front board from theback of the front panel unit.Fig.20Front panelassemblyZZFront panel

45、assemblyFront boardPQDisplay board(No.MB434)1-133.2.9Removing the Switch board and sound mode and CD function switch board (See Fig.19 to 22) Prior to performing the following procedures, remove the topcover. Also remove the CD changer unit. Also remove the front panel assembly.(1) Pull out the volu

46、me control knob from the front of the frontpanel 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 screws S retaining the sound mode and CDfunction (key 2) sw

47、itch board.(Fig.20)Fig.21Fig.22Volume knobFront panel assemblyFront panel assemblyVolum shaft1-14 (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 following procedures, remove the topcover and both sides board. Also

48、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 thefront side of the cassette deck.Caution:After attaching the main mo

49、tor, check the orientation ofthe motor and the polarity of the wires.(4) From the backside of the cassette deck, remove the mainmotor and two main belts.Caution:The lengths of the cassette A(playback only) and cassetteB(record/play) main belts are different. When attaching themain belts, use the lon

50、ger belt for cassette A.Fig.23Fig.243.2.11 Removing the leaf switches of the cassette deck mechanism (See Fig. 18 and 25) Prior to performing the following procedures, remove the topcover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly.(1) Remove the six s