JVC-AXV8000-int-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1772004/3AUDIO/VIDEO CONTROL AMPLIFIERMB17720043AX-V8000TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 Area suffixUP - KoreaAUDIO/VIDEO CONTROL AMPLIFIERST ANDB Y/ONST ANDBYPHONESDIMMERCC CONVERDOORUPDOORDOWNMASTER VOLUMES-VIDEODIGITALVIDEOLAUDIORVIDEOCHANNELTV/VIDEOMUTINGDVDON/OFFON/OFFSTANDBY/ONSTANDBY/ONSTANDBYTV/CATV/DBSVCR 1ONDVD MULTICDCDRPHONOTAPE/MDEXT 7.1CHANALOG/DIGITALCC CONVERTEREFFECTLIVENESSSOUNDTESTTHXEX/ES/7.1ANALOG DIRECTSLEEPDIMMERFM MODEDSPSURR/DSPSURROUNDRETURN100+OFFINPUTSETSETUPMENUADJUSTMENUDVDMENUEXITTEXTDISPLAY1234567/P8910+100TV VOLVOLUMETUNINGSTOPPAUSELIGHTFF/ REWRECPLAYDOWNUPRM-SRXDP20JREMOTE CONTROLA/V CONTROL RECEIVERVCR 1VCR 2FM/AMVIDEOTV/DBSZONE 2TRANSMITLEARNZONE 1ZONE 2ZONE 1 ZONE 2LEARNZONE 1TVCATV/DBSRadioFans.CN 收音机爱 好者资料库1-2 (No.MB177)SECTION 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. Replacement 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 will 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 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 having 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, 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 lead 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 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 currentfrom 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 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 exposed 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.). 1.2Warning(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 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 system.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 them, 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 TYPERadioFans.CN 收音机爱 好者资料库(No.MB177)1-3SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-4 (No.MB177)SECTION 3DISASSEMBLY3.1Main body section3.1.1Removing the top cover (See Fig.1)(1) From the top sides of the main body, remove the ninescrews A attaching the top cover.(2) From the back side of the main body, remove the threescrews B attaching the top cover.(3) Take out the top cover upward in the direction of the arrow.3.1.2Removing the side panel (L) & side panel (R) & stay bkt (See Figs.1 and 2) Prior to performing the following procedure, remove the topcover. (1) From the left sides of the main body, remove the fourscrews C attaching the side panel (L). (See fig.1)(2) From the right sides of the main body, remove the threescrews C attaching the side panel (R). (See fig.1)(3) From the top side of the main body, remove the four screwsD attaching the side panel (L) and the side panel (R). (Seefig.2)(4) Remove the four screws E attaching the stay bkt, and takeout the stay bkt. (See fig.2)Fig.1Fig.2Top coverCCCBSide panel (R)Side panel (L)AEEDDSide panel(L)Stay bktSide panel(R)E(No.MB177)1-53.1.3Removing the front panel assembly (See Figs.3 to 6) Prior to performing the following procedure, remove the topcover, side panels and stay bkt. (1) From the top side of the main body, cut off the tie bandfixing the wire. (See fig.3)(2) Remove the three screws F attaching the front panelassembly. (See fig.3)(3) Remove the screw G attaching the lug wire. (See fig.3)(4) From the bottom side of the main body, remove the fourscrews H attaching the front panel assembly and take outthe front panel assembly forward. (See fig.4)(5) From the front side of the main body, disconnect the wirefrom the connectors CN971, CN977, CN983 and CN985on the system control board. (See fig.5)(6) From the reverse side of the front panel assembly,disconnect the wire from the connector CN973 on the frontAV in board. (See fig.6)(7) Disconnect the wire from the connector CN373 on the frontDIGITAL in board. (See fig.6)Reference:When attaching the screws F and screw G, attach the lug wirewith it.Fig.3Fig.4Fig.5Fig.6F(fixing thelug wire)GTie bandFront panel assemblyHFront panelassemblySystem control boardCN985CN971CN977CN983CN973Front AV in boardCN373Front DIGITAL in board1-6 (No.MB177)3.1.4Removing the rear panel (See Fig.7) Prior to performing the following procedure, remove the topcover, side panels and stay bkt.(1) From the top side on the main body, remove the protectcover and the solders from the two solder points on the ACinlet.(2) From the bottom side on the main body, remove the fourscrews J attaching the rear panel.(3) From the back side on the main body, remove the forty-sixscrews K, two screws L and three screws M attaching eachboard to the rear panel.3.1.5Removing the audio signal 3 board & compu link board (See Figs.7 and 8) Prior to performing the following procedure, remove the topcover, side panels and stay bkt.(1) From the top side of the main body, cut off the tie bandfixing the wire. (See fig.8)(2) Disconnect the wire from the connector CN201 on theaudio signal 1 board. (See fig.8)(3) From the back side of the main body, remove the twoscrews L attaching the audio signal 3 board to the rearpanel. (See fig.7)(4) From the top side of the main body, disconnect the wirefrom the connector CN302 on the compu link board. (Seefig.8)(5) Disconnect the wire from the connector CN207 on theaudio signal 1 board. (See fig.8)(6) From the back side of the main body, remove the threescrews M attaching the compu link board to the rear panel.(See fig.7)Fig.7Fig.83.1.6Removing the Y/C separator board (See Fig.9) Prior to performing the following procedure, remove the topcover, side panels and stay bkt.(1) From the top side of the main body, cut off the tie bandfixing the wire.(2) Disconnect the connectors CN481 and CN482 on the Y/Cseparator board, and take out the Y/C separator boardupward.Fig.9JKKAC inletBlackRedSolder partKJJKKProtect coverLKRear panelKKKMTie bandsAudio signal3 boardCN201Audio signal 1 boardCompu linkboardCN207CN302Y/C separatorboardCN481CN482Tie bands(No.MB177)1-73.1.7Removing the system control board (See Figs.10 and 11) Prior to performing the following procedure, remove the topcover, side panels, stay bkt and front panel assembly.(1) From the top side of the main body, cut off the tie bandsfixing the wires. (See fig.10)(2) Disconnect the wire from the connector CN45 on the power2 board . (See fig.10)(3) Disconnect the wire from the connector CN25 on thepower/ fuse board. (See fig.10)(4) Disconnect the wire from the connector CN234, CN208 onthe audio signal 1 board. (See fig.10)(5) From the front side of the main body, disconnect the wiresfrom the connector CN963, CN964 and CN981 on thesystem control board. (See fig.11)(6) Remove the three plastic rivet, and take out the systemcontrol board. (See fig.11)Fig.10Fig.113.1.8Removing the DSP 1 board & DSP 2 board & shield cover (See Fig.12) Prior to performing the following procedure, remove the topcover, side panels, stay bkt, front panel assembly and rearpanel.(1) From the top side of the main body, disconnect theconnector CN631 on the DSP 2 board.(2) Disconnect the connector CN203 on the audio signal 1board, and cut off the tie bands fixing the wire.(3) Remove the two plastic rivet, and disconnect the connectorCN633, CN643 on the DSP 2 board, and disconnectCN635 on the DSP 1 board.(4) Remove the screw N attaching the barrier to the shieldcover, and take out the shield cover.Fig.12CN25CN234CN208CN45Power/ fuse boardAudio signal 1 boardTie bandsTiebandsPower 2 boardSystem control boardPlastic rivetPlastic rivetCN963CN981CN964Shield cover(Top view)CN631CN635CN643Plastic rivetDSP 2 boardNCN203CN633Audio signal 1 boardDSP 1boardBarrier1-8 (No.MB177)3.1.9Removing the audio signal 1 board (See Fig.13) Prior to performing the following procedure, remove the topcover, side panels, stay bkt, front panel assembly and rearpanel, DSP 1 board, DSP 2 board and shield cover.(1) From the top side of the main body, disconnect the wiresfrom the connectors CN202, CN204, CN234, CN224,CN208, CN218 and CN223 on the audio signal 1 board.(2) Remove the plastic rivet, and disconnect the connectorsCN205, CN221 and CN206 on the audio signal 1 board.(3) Take out the audio signal 1 board.Fig.133.1.10 Removing the audio signal 2 board & video board & S video board & component video board & D5 video board (See Figs.14 and 15) Prior to performing the following procedure, remove the topcover, rear panel, front panel assembly, Y/C separator board,DSP 1 board, DSP 2 board, shield cover and audio signal 1board.(1) From the top side of the main body, disconnect the wirefrom the connector CN324 on the audio signal 2 board.(See fig.14)(2) Disconnect the audio signal 2 board from the connectorCN15 and CN6 on the main board. (See fig.15)(3) Disconnect the video board from the connector CN7 on themain board. (See figs.14 and 15)(4) Disconnect the S video board from the connector CN8 onthe main board. (See figs.14 and 15)(5) Disconnect the wire from the connector CN502 on thecomponent video board. (See fig.14)(6) Disconnect the component video board from the connectorCN9 on the main board. (See fig.15)(7) Disconnect the D5 video from the connector CN10 on themain board. (See figs.14 and 15)Fig.14Fig.15Plastic rivetCN204CN202Audio signal 1 boardCN205CN221CN206CN234CN224CN208CN223CN218Video boardComponentvideo boardAudio signal 2 boardS video boardCN324Main boardD5 video boardCN502Main boardCN15CN6CN7CN8CN9CN10(No.MB177)1-93.1.11 Removing the main board (See Figs.16 and 17) Prior to performing the following procedure, remove the topcover, rear panel, front panel assembly, Y/C separator board,DSP 1 board, DSP 2 board, shield cover, audio signal 1 board,audio signal 2 board, video board, S video board, componentvideo board and D5 video board.(1) From the top side of the main body, cut off the tie bandsfixing the wire. (See fig.16)(2) Disconnect the wire from the connector CN62 on theregulator board. (See fig.16)(3) Disconnect the wire from the CN44 on the power 2 board .(See fig.16)(4) Disconnect the wire from the connector CN743 on thespeaker relay board. (See fig.17)(5) Disconnect the card wire from the connector CN1, CN2and the wire from the connector CN11 on the main board.(See fig.16)(6) Remove the seven screws P attaching the main board, andtake out the main board. (See fig.16)3.1.12 Removing the speaker relay board (See Fig.17) Prior to performing the following procedure, remove the topcover, side panels, stay bkt and rear panel.(1) Disconnect the wire from the connector CN741, CN742and CN743 on the speaker relay board.Fig.16Fig.173.1.13 Removing the regulator board (See Fig.18) Prior to performing the following procedure, remove the topcover, side panels and stay bkt.(1) From top side of the main body, disconnect the wires fromthe