JVC-AXV8000-int-sm 维修电路原理图.pdf
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1、SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1772004/3AUDIO/VIDEO CONTROL AMPLIFIERMB17720043AX-V8000TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
2、SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-44A
3、DJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . 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 CONVERTERE
5、FFECTLIVENESSSOUNDTESTTHXEX/ES/7.1ANALOG DIRECTSLEEPDIMMERFM MODEDSPSURR/DSPSURROUNDRETURN100+OFFINPUTSETSETUPMENUADJUSTMENUDVDMENUEXITTEXTDISPLAY1234567/P8910+100TV VOLVOLUMETUNINGSTOPPAUSELIGHTFF/ REWRECPLAYDOWNUPRM-SRXDP20JREMOTE CONTROLA/V CONTROL RECEIVERVCR 1VCR 2FM/AMVIDEOTV/DBSZONE 2TRANSMIT
6、LEARNZONE 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 mad
7、eto 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 altera
8、tions 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 saf
9、ety-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 a
10、re 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 repl
11、acement 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 preventi
12、on 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 che
13、ck 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 direct
14、ly 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 chec
15、k 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 acr
16、oss 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 an
17、y 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
18、 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. Theref
19、ore, 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
20、 ( ) 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(Havin
21、g 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) F
22、rom 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 (
23、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)
24、(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 p
25、anel(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 th
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