JVC KD-LH401 service manual Feed section, Focus section Spindle section, Tracking section

Page 29

SECTION 5

TROUBLESHOOTING

5.1Feed section

Is 5v or 0V at IC621 pin 40?

YES

NO		Is the wiring for IC621	YES		Is 5V present at IC681
		pin 40 correct?			pin 6?
						YES
						YES
		NO			Check the vicinity of
					IC621.

NO

Check CD8V.

Is 4V present at both sides of the feed motor?

YES

Check the feed motor.

5.2Focus section

5.3Spindle section

NO Is 6V or 2V present at YES IC681 pins 17 and 18?

NO

Check IC681.

	When the lens is		NO
	moving:
	moving:	4V

Does the S-search waveform appear at IC681 pins 13 and 14?

YES

Check the feed motor connection wiring.

Check the circuits in the vicinity of IC681 pins 1 and 2.

YES

Check the pickup and its connections.

Is the disk rotated?

YES

Does the RF signal appear at IC601 pin 19?

YES

Is the RF waveform

at IC601 pin 19 distorted?

YES

Proceed to the Tracking section

5.4Tracking section

NO

NO

NO

Is 4V present between IC681 pins 15 and 16?

YES

Check the spindle motor and its wiring.

Check the circuits in the vicinity of IC601 or the pickup.

NO

Is 4V present at IC621 pin 41?

YES

Check the vicinity of IC681.

NO

Check IC621.

When the disc is rotated at first:

Approx. 1.2V

Is the tracking error signal output at IC601 pin 11?

NO

Check the circuits in the vicinity of IC601 pins 2 to 12.

NO

Check the pickup and its connections.

YES

Check IC621.

(No.MA063)1-29

Image 29

Contents KD-LH401 Specification Section Precaution Handling the traverse unit optical pickup Preventing static electricityGrounding to prevent damage by static electricity Important for laser products Reproduction and Position of LabelsSection Specific Service Instructions Removing the heat sink See Main body section Removing the front panel assembly SeeReference Removing the top chassis assembly See Figs.3 toRemoving the mechanism control board See Removing the front chassis See Figs.7Top chassis Removing the CD mechanism assembly SeeRemoving the main board See Figs.11 FPC guide Removing the rear bracket SeeRemoving the gear bracket unit See Removing the front board See Figs.15 to Rear cover assembly PCD Mechanism section Removing the top cover See Figs.1 Removing the connector board See Figs.3 to DET Removing the DET switch See Figs.6Removing the chassis unit See Figs.8 Removing the clamper assembly See Figs.10 Removing the loading / feed motor assembly See Figs.12 Reattaching the pickup unit See Figs.14 to Removing the pickup unit See Figs.14 toRemoving the trigger arm See Figs.19 Removing the top plate assembly SeeRemoving the mode sw. / select lock arm See Figs.22 Reference Reassembling the mode sw. / select lock arm See Figs.24 toReattaching the Select arm R / link plate See Figs.29 Removing the select arm R / link plate See Figs.27Removing the loading roller assembly See Figs.31 to Removing the loading gear 5, 6 and 7 See Figs.35 Pull out the feed gear Removing the gears See Figs.37 toRemoving the turn table / spindle motor See Figs.41 „ Dummy load „ Standard volume positionTracking section Feed sectionFocus section Spindle section Signal processing section Replacement of laser pickup Maintenance of laser pickupANT No.MA0631-33 Victor Company of JAPAN, Limited CD-ROM No.SML200404 ContentsNo.MA063SCH 2004/4 Safety precaution X571 IC573IC572 IC571Main amplifier section Standard schematic diagramsSN74AHCU04PW-X CD servo control sectionC823 LCD & Key control sectionMain board Printed circuit boardsMecha control board Front boardM O No.MA063SCH Parts List Exploded view of general assembly and parts list Main board C32 General Assembly CD mechanism assembly and parts list CD mechanism Electrical parts list QERF1CM-226Z Capacitor Part Name Description Local R74 NRSA63J-101X Front board TA E Capacitor Micon control board NRSA63J-4R7X MG Resistor Part Name Description Local R685 NRSA63J-682X Memo Packing materials and accessories parts list Packing and Accessories KD-LH401 Important for Laser Products How to reset your unitContents Control panel Location of the ButtonsIllumination Navigation for easy operations Control dial ¢ buttonsRemote controller Remove the battery holder Installing the batteryReturn the battery holder Place the batteryCurrent sound mode iEQ see Adjust the sound as you want. See pages 32Basic Operations Select the sourceTo turn off the power To drop the volume in a momentAdjust the hour Set the minute Setting the clockTo check the clock time when the unit is Set the clock systemListening to the radio Radio OperationsSearching for a station automatically Auto search Start searching for a stationEach time you press Button, the band changes as Follows Searching for a station manually Manual searchWhen an FM stereo broadcast is hard to receive FM station automatic preset SSMStart automatic preset Storing stations in memoryEach time you press the button, the band changes as follows Manual presetTune in to a station in this example, of 92.5 MHz Select the number 1 6 for the preset station you want Selecting a preset station directlySelecting a preset station using the preset station list Changing the display pattern When receiving an AM or non FM RDSStation See the following pagesTo use Network-Tracking Reception RDS OperationsWhat you can do with RDS PTY Stnby standby setting screen Appears on the display Using TA Standby ReceptionTo select your favorite PTY code for PTY Standby Reception Using PTY Standby ReceptionTo set PTY Standby Reception Select one of the twenty-nine PTY codes. SeeTo store your favorite programme types Searching for your favorite programmeTo store your favorite programme types, see To search for your favorite programme typeTo search for your favorite programme Setting the TA volume level Other convenient RDS functions and adjustmentsAutomatic clock adjustment To activate programme search, follow the procedure belowSame programme can be received on different frequencies PTY codesAbout MP3 and WMA discs Disc OperationsPlaying a disc Open the control panelTo stop play and eject the disc Display indications when inserting an audioCD or a CD Text Or a WMA discs To return the control panel to its previousTo activate ImageLink, follow the procedure below What is ImageLink?Particular portion on a disc Locating a track or aTo go to the next or previous tracks To go to a track quickly¢ or 4 after selecting the folder To select a particular track in a folder, pressSelecting a folder and start playback Selecting a track and start playbackSelect the number 1 6 for the folder you want to play Select the number 1 6 for the track you want to playTo play back tracks repeatedly Repeat Play To play back tracks at random Random PlayTo cancel intro scan, select Intro Off by To cancel the prohibition and unlock the discProhibiting disc ejection To play back only intros Intro ScanTag is set to Off While playing an audio CD or a CD Text discCurrent track NumberAdjusting the sound Sound AdjustmentsMake adjustments Select the item you want to adjustTo adjust the input level of each source -Vol Adj Selecting preset sound modes iEQ intelligent equalizerPress SEL select once Available sound modesPress the number button to select the sound mode you want Sound modes preset frequency level settingsTo cancel the sound mode, select Flat To exit from the sound mode selectionSelect the sound mode you want to adjust Storing your own sound modes 4 Make adjustments as you likeStore the adjustment you made Enter the sound adjustment modeMeter ViewShake OffGraphic Displays Install / Start the programImport the images Retouch and edit the imagesPress number button 6 to show the download selection screen Press M Mode after the disc is detectedDownloading images and animations You can assign your own names when editing a CD-R If you want to cancel the procedureIf it is OK, press number button 1 to start downloading Select highlight a file you want to downloadFile name appears, and the unit will Ask you Download OK? AgainTo delete all the stored files at a time Deleting unwanted filesTime, and Movie To delete the files stored for OpeningAgain To delete the stored files for Picture one by oneEx. When you select Opening Activating the graphic screen using either picture or movieGraphics setting screen appears on Display Activating the downloaded images and animationsTo cancel all graphic displays, select Off in step Select a file you want Finish the settingSelect UserMovie, UserSlide, or UserPict Select UserPictAdjust Basic ProcedureOther Main Functions Ex. To change ContrastPreferred Setting Mode PSM items Indications Selectable values/items TA VolumePTY Stnby AF-Regn’lTo show the graphics on the display -Graphics To adjust the display contrast level -ContrastTo select the display illumination pattern -LCD Type To turn the tag display on or off-TagTo select the amplifier gain control -Amp.Gain To change the FM tuner selectivity -IF FilterTo select the external component to use -Ext Input Set the dimmer mode as you like Select the source that you want to Setting the desired color for each sourceSet the display color for Press and hold SEL select for moreOne of the user color adjustment screens appears Select the user color adjustment screenYou can adjust within the range of 00 to Creating your own color-UserAssigning names to the sources When you select a source, the power Automatically comes onTo erase the entered characters Sources Maximum number CharactersControl panel angles changes as follows Changing the control panel angleAttaching the control panel ConnectorsDetaching the control panel Select the CD changer CD-CH CD Changer OperationsPlaying discs To go to a particular disc directly To change the display patternTo fast-forward or reverse the track Selected disc number Current track and elapsed playing timeTo skip to the next or previous folder only for MP3 discs Disc name list Folder name list Track name list Selecting a disc/folder/track using the name listsDisplay can show only six names at a time Selected disc numberFor MP3 discs For CDs For MP3 discs For CDs Mode Active Plays at randomTo cancel repeat play, select Repeat Off by Mode Active Plays repeatedlyMode changes as follows For MP3 discs For CDs Mode ActiveTurn on the connected component and start playing the source External Component OperationsDAB Tuner Operations What is DAB system?Select the DAB tuner Select the DAB band DAB1, DAB2, or DAB3To stop searching before an ensemble is To tune in to a particular ensemble without searchingStart searching for an ensemble To restore the FM/AM tuner Storing DAB services in memoryTo cancel the DRC effect, select DRC Off To select the next service To select the previous serviceSelecting a preset service using the preset service list ServiceWhat you can do more with Using Announcement Standby ReceptionRoad Traffic News Standby Reception TA Standby Reception For Announcement Standby ReceptionHow Announcement Standby Reception works To activate Announcement Standby ReceptionAnnouncement type Travel Programmes about travelWhile receiving a DAB service Searching for your favorite serviceTo use Alternative Reception While receiving an FM RDS stationChanging the display pattern Symptoms Causes Remedies TroubleshootingMP3/WMA track although it has Noise is generated Track played back is not anWma Longer readout time is Readout time varies due toAccented letters Available charactersGraphics CD Changer Upper case Lower caseHandling discs MaintenanceFM Tuner SpecificationsMW Tuner LW TunerZie de pagina met de paragraaf Het apparaat terugstellen Refer to page of How to reset your unitSiehe Seite Zurücksetzen des Geräts Die folgenden Teile werden zusammen mit Und Erdung ausgelegt. Verfügt IhrDiesem Gerät geliefert Nach ihrer Überprüfung, die Teile richtig einsetzenRemarque HinweisFuse blows Sound is distortedAlvorens de verbindingen tot stand te Avant de commencer la connexion VérifiezKD-LH401 Pour l’amplificateur seulementOder KS-U57 *4 KD-LH401

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