ELNA Elnita ec 30 User manual

SERVICE MANUAL
MODEL: ec 30
First Edition: 25 June 2020

Contents
WHAT TO DO WHEN........................................................................................................................ 1 - 3
CHANGING EXTERNAL PARTS
FACE COVER .........................................................................................................................................4
BED COVER ...........................................................................................................................................5
FRONT COVER ......................................................................................................................................6
REAR COVER.........................................................................................................................................7
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT ........................................................................................................................8
NEEDLE DROP POSITION.....................................................................................................................9
ADJUSTMENT OF HOOK TIMING .......................................................................................................10
ADJUSTMENT OF NEEDLE BAR HEIGHT..........................................................................................11
CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK ..............................................12
FEED DOG HEIGHT .............................................................................................................................13
BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR ...................................................14
TOP TENSION ......................................................................................................................................15
STRETCH STITCH FEED BALANCE ...................................................................................................16
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE....................................17
SELF-DIAGNOSTIC TEST
SELF-DIAGNOSTIC TEST.............................................................................................................. 18-22
TO DISPLAY THE VERSION OF THE PROGRAM...............................................................................22
REPLACING THE ELECTRONIC COMPONENTS
PRINTED CIRCUIT BOARD A CONNECTION .....................................................................................23
PRINTED CIRCUIT BOARD A ..............................................................................................................24
PRINTED CIRCUIT BOARD L...............................................................................................................25
DRIVING MOTOR (DC MOTOR) ..........................................................................................................36
SWITCHING REGULATOR UNIT..........................................................................................................27
PARTS LIST.................................................................................................................................... 28-41

1
 Condition Cause Howtox Reference
1. Skipping
Stitches
1. Needleisnotinsertedproperly.
2. Needleisbentorworn.
3. Incorrectlythreaded.
4. Needleorthreadare
 inappropriateforthefabric
being sewn.
5. Sewingonstretchfabric.
6. Inappropriateneedlebar
 height.
7. Inappropriateneedletohook
timing.
8. Inappropriateneedletohook
 clearance.
Inserttheneedleproperly.
Changetheneedle.
Rethread.
Usetherecommendedsewingneedle
andthethread.
UseaHAx1#11bluetipneedle.
Seemechanicaladjustment“Adjustment
ofNeedlebarheight”.
Seemechanicaladjustment“Adjustment
ofHooktiming”.
Seemechanicaladjustment“Clearance
betweenneedleandtipoftherotary
hook”.
P. 11
P. 10
P. 12
2. Fabricisnot 
moving
1. Incorrectfeeddogheight.
2. Feeddogisinthedownposition.
3. Threadonthebottomsideof 
 thefabricisjammedup.
4.Feeddogteethareworn.
Seemechanicaladjustment“Feeddog
height”.
Raisethefeeddog.
Makesuretobringbothneedleand
bobbinthreadsunderthefootwhenstart
sewing.
Changethefeeddog.
P. 13
WHAT TO DO WHEN

2
Condition Cause How to Fix Reference
3. Breaking 
 upper 
 thread.
1. Initial sewing speed is
 toofast.
2. Threadpathisincorrect.
3. Needleisbentordull.
4. Toptensionistoostrong.
5. Needlesizeisinappropriatefor 
 fabric.
6. Needleeyeisworn.
7. Needleholeinneedle plate is
 wornorburred.
Startwithmediumspeed.
Usetheproperthreadpath.
Replacewithanewneedle.
Adjusttoptensioncorrectly.
Useappropriateneedleforfabricand
threadinuse.
Changetheneedle.
Repairtheholeorreplacetheneedle
plate.
4. Breaking 
bobbin
 thread.
1.Bobbinholderisincorrectly
 threaded.
2.Toomuchthreadiswound 
 onthebobbin.
3.Lintisstuckinsidethebobbin 
 holder.
4.Threadqualityistoolow.
5.Threadisjammingaroundthe 
 bobbinholder.
Setthebobbinthreadcorrectly.
Adjustthepositionofbobbinwinder
stopper.
Cleanthebobbinholder.
Changetoahighqualitysewingthread.
Clearoutthejammingthread.
5. Needle
 breaks
1.Needleishittingtheneedleplate.
2.Needleisbentorworn.
3.Needleishittingthehook.
4.Fabricisbeingpulledtoostrongly
 whilesewing.
Seemechanicaladjustment“Needledrop
position”.
Changetheneedle.
Seemechanicaladjustment“Clearance
betweenneedleandtipoftherotary
hook”.
Guidethefabricgentlywhilesewing.
P. 9
P. 12
WHAT TO DO WHEN

3
 Condition Cause Howtox Reference
6.Noisy
operation
1. Backlashbetweenhookgear
 andlowershaftgearistoo
 great.
2. Lowershaftgearisloose.
3.Inappropriatebelttension.
4. Notenoughoil.
5.Uppershaftgearisloose.
Eliminatethebacklash.
Eliminatethelooseness.
Seepartremovalandreplacement
“Drivingmotor(DCmotor)”.
Oilallmovingparts.
Eliminatethelooseness.
P. 14
P. 14
P. 26
7.Deformation
pattern
1.Inappropriatefeedbalance.
2. Toptensionistoostrong.
Adjustthefeedbalancingscrew.
Seemechanicaladjustment
“Toptension”.
P. 16
P. 15
WHAT TO DO WHEN

4
CHANGING EXTERNAL PARTS
FACE COVER
To remove:
1.Removethesetscrewq.
2.Removethefacecoverw.
To attach:
3.Followtheaboveprocedureinreverse.
w
q

5
BED COVER
To remove:
1.Removethesetscrewq.
2.Removethesetscreww.
3.Movethebedcoveretothelefttounlockthecover.
4.Slidethebedcovertotheuptoremovethecover.
To attach:
5.Followtheaboveproceduresinreverse.
CHANGING EXTERNAL PARTS
q
w
e

6
CHANGING EXTERNAL PARTS
FRONT COVER
To remove:
1.Removethefacecoverandbedcover(Refertopages4and5).
2.Removethesetscrewsq(2pcs.).
3.Loosenthesetscreww.
4.Loosenthesetscrewe.
5.Loosenthesetscrewr.
6.Removethesetscrewt.
7. Disengagethefrontcoverandrearcoverhooks.
8.Removethefrontcover y.
9.DisconnectalltheconnectorsfromthecircuitboardA.
NOTE:
Donotdisconnecttheconnectorsbypullingcords.Todisconnect,grasptheconnector,notthecord.
To attach:
9.Followtheaboveproceduresinreverse.See"PRINTEDCIRCUITBOARDACONNECTION"(Page23).
q
w
t
e
r
y

7
CHANGING EXTERNAL PARTS
REAR COVER
To remove:
1.Removethefacecover,bedcoverandfrontcover(Refertopages4to6).
2.Removethesetscrewq.
3.Removethesetscrewsw(4pcs.).
4.Removetherearcover e.
5.Disengagetherearcover eandthreadtensionhooks r.
To attach:
6.Followtheaboveproceduresinreverse.
qr
e
ww
w
w

8
6.0 mm
MECHANICAL ADJUSTMENT
PRESSER BAR HEIGHT
Thedistancebetweenthebottomofthepresserfootinuppositionandtheneedleplateshouldbe6.0mm.
1. Removethefaceplateandneedle.
2. Lowerthefeeddogbelowtheneedleplate.
 Place6.0mmthickblockunderthe presserfootandlowerthepresserfootlifter.
3. Loosenthehexagonalsocketscrew.Raisethepresserfootlifterandtightenthesetscrewrmly.
 Attachtheneedleandfaceplate.
NOTE:
Makesurethatthepresserfootshouldbeparalleltothefeeddogslotsintheneedleplate.
Feed dog slots
Zigzagfoot(A)
Feed dog
Block
Needle plate Presserfootshouldbeparallel
tothefeeddogslots.
Hexagonalsocketscrew Presserfootlifter

9
0.2 mm
ormore
0.2 mm
ormore
(A)
(B)
A = B
MECHANICAL ADJUSTMENT
NEEDLE DROP POSITION
Needleplatehole
Selectthezigzagstitch.
Setthestitchwidthto“5.0”.
Theclearancebetweentheneedledroppositionandtheedgeofneedleshouldbe0.2mmormoreforboth
sides.
Ifnot,maketheadjustmentasfollows:
1. Turnthepowerswitchon.
2. Removethefacecover(Refertopage4).
3. Setthestitchwidthto“5.0”.
4. Makethefollowingadjustmentsiftheclearancebetweentheneedledroppositionandtheadgeoftheneedle
 areevenforbothsides.
* Turnthesetscrewclockwise(inthedirectionofA)iftheclearanceontherightsideoftheneedleplateholeis
 smallerthan0.2mm.
* Turnthesetscrewcounterclockwise(inthedirectionofB)iftheclearanceontheleftsideoftheneedleplate
 holeissmallerthan0.2mm.
NOTE:
Checkthehooktimingafterthisadjustment.
Setscrew

10
Selectthezigzagstitch .
Setthestitchwidthto“5.0”.
Theamountofascendingtraveloftheneedlebarfromitslowerpositiontothepositionwherethetipofthe
rotaryhookexactlymeetstherightsideoftheneedleshouldbe1.4to2.0mm.
1.Removethebedcover(Refertopage5).
2.Selectthezigzagstitch.
 Setthestitchwidthto“5.0”.
 Bringtheneedleatrightlowestneedleposition.
3.Removethesetscrewontheneedleplate,theneedleplateandthebobbinholder.
4.Loosenthehexagonalsocketscrewsonthelowershaftgear.
5.Turnthehandwheeltowardyoutoraisetheneedlebar1.7mmfromitsrightlowestposition.
6.Whileholdingthehandwheeltopreventtheneedlebarfrommoving,turnthelowershaftgearinthedirection
 ofarrowuntilthetipoftherotaryhookexactlymeetstherightsideoftheneedle.
7. Tightenthehexagonalsocketscrewsonthelowershaftgear.
8.Attachthebobbinholder,needleplateandbedcover.
MECHANICAL ADJUSTMENT
ADJUSTMENT OF HOOK TIMING
Needle plate
Bobbinholder
Hexagonalsocketscrew
Lowershaftgear
Rightposition
Tipofhookmeetstherightsideoftheneedle
Lowest needle position
1.4 to 2.0 mm
Setscrew
Hexagonalsocketscrew

11
Thestandarddistancebetweentheupperedgeoftheneedleeyeandtheuppersurfaceofthehookrace
shouldbeintherangeof3.0to3.6mmwhenthehookpointmeetstherightsideoftheneedleinitsascending
travelfromrightlowestpositionofthemaximumwidthzigzagstitch.
1.Removethefacecoverandbedcover(Refertopages4to5).
2.Turnthepowerswitchon.
 Selectthezigzagstitch,andsetthestitchwidthto“5.0”.
 Bringtheneedletotherightlowestposition.
3.Removethesetscrewontheneedleplate,theneedleplateandthebobbinholder.
4.Turnthehandwheeltowardyouuntilthehookpointmeetstherightsideoftheneedle.
5.Loosenthehexagonalsocketscrewandmovetheneedlebarupordowntoadjusttheneedleheight.
6.Tightenthehexagonalsocketscrew.
7. Attachthebobbinholder,needleplateandfacecoverandbedcover.
NOTE:
Beforeperformingthisadjustment,checktheneedletohooktiming.
MECHANICAL ADJUSTMENT
ADJUSTMENT OF NEEDLE BAR HEIGHT
3.0 to 3.6 mm
Upperedgeofneedleeye
Hookrace(unit)
Uppersurfaceofhookrace
Tipofhookmeetstherightsideoftheneedle
Rightposition
Needle plate
Bobbinholder
Setscrew
Hexagonalsocketscrew

12
Adjustment procedure:
1.Removethefacecover.(Refertopage4).
2.Removetheneedleplateandbobbinholder.
 Attachthemasterneedle.
 Turnthepowerswitchon.
 Selectthezigzagstitch,andsetthestitchwidthto“5.0”.
3.Removethesetscrewontheneedleplate,theneedleplateandthebobbinholder.
 Replacetheneedlewiththemasterneedleandtightentheneedleclampscrew.
4.LoosenthesetscrewsA(2pcs.)andmovethepresserbarbaseplateinthedirectionofthearrows(BorC).
*MovethepresserbarbaseplateinthedirectionofBwhentheclearanceistoolarge.
*MovethepresserbarbaseplateinthedirectionofCwhentheclearanceittoosmall.
 Adjusttheclearancebetweeentheneedleandhookbetweeen-0.10to+0.05mm.Tightenthesetscrews.
*Theedgeofpresserbarbaseplateshouldalwaystouchesthebosseswhileadjustingtheclearanceit.
5.Attachthebobbinholderandneedleplate.Attachthefacecover.
NOTE:
Besurethattheclearancebetweentheneedledroppositionandtheedgeofneedleshouldbe0.2mmmore
forbothsides(Refertopage9).
*Theclearancebetweentheneedleandthepointofhookshouldbe–0.10to+0.05mm.
CLEARANCE BETWEEN NEEDLE AND TIP OF THE ROTARY HOOK
MECHANICAL ADJUSTMENT
Boss
Needle plate
Setscrew
SetscrewA
DirectionB
DirectionC
Bobbinholder
Needleclampscrew
–0.10to+0.05mm
Tipofhook
Masterneedle

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Thehighestpositionofthefeeddogshouldbe0.80to0.95mmfromthesurfaceoftheneedleplate.
To check:
1.Lowerthepresserfoot.
2.Turnthehandwheeltowardyoutoraisethefeeddogatitshighestposition.
 Thedistancebetweenthefeeddogandtheuppersurfaceoftheneedleplateshouldbe0.80to0.95mm.
 Ifitisnotintherange,adjustasfollows.
To adjust:
3.LoosenthescrewA.
4.Turnthehandwheeltobringthefeeddogtoitshighestposition.
5.Ifthefeeddogheightislowerthan0.80mm:turnadjustingscrewBinthedirectionofC.
6.Ifthefeeddogheightisheigherthan0.95mm:turntheadjustingscrewBinthedirectionofD.
7. TightenthescrewA
FEED DOG HEIGHT
MECHANICAL ADJUSTMENT
0.80 to 0.95 mm
Uppersurfaceoftheneedleplate
A
B
DC

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Therotaryplayofthehookpointshouldbe0.8mmorlesswhenitisinbetweenthespanofthefeeddogteeth,
andthegearsshouldturnsmoothly.
1.Removetheneedleplateandbobbinholder.
2.Removethebedcover(Refertopage5).
3.LoosenthesetscrewA.
*Iftherotaryplayistoolarge,turnthelowershaftbussinginthedirectionofB.
*Iftherotaryplayistoosmall,turnthelowershaftbussinginthedirectionofC.
4.TightenthesetscrewA.
5.Attachthefrontcover.
6.Attachthebobbinholderandneedleplate.
BACKLASH BETWEEN HOOK GEAR AND LOWER SHAFT GEAR
MECHANICAL ADJUSTMENT
B
C
Needle plate
Spanoffeeddogs
Hook point
0.8mmorless
SetscrewA
Notch
Lowershaftbushing
Setscrew
Bobbinholder

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MECHANICAL ADJUSTMENT
TOP TENSION
Thetoptensionshouldbebetween75to90gfwhenpullingthethread(polyestersewingthread#50(white))up
inthedirectionofarrow(Makesurethethefootislowered)withthetensiondialat“4”.
Ifthetensionisoutoftherange,adjustasfollows:
1.Removethefrontcover(Refertopage6).
2.Setthetensiondialat“4”.
3.Afterthreadingtheupperthread,lowerthepresserfoot.
•Ifthetoptensionistootight,turntheleadscrewinthedirectionA.
•Ifthetoptensionistooloose,turntheleadscrewinthedirectionB.
4.Checkthetoptensionandattachthefrontcover.
Polyestersewingthread#50(white)
Pullthethreadatthespeedof110mm/secinthedirectionofarrow.

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MECHANICAL ADJUSTMENT
STRETCH STITCH FEED BALANCE
To check:
1. Turnthepowerswitchon.
 Besurethefeedbalancingdialissetatstandardpositionasshownbelow.
2. Selectthetriplestitch“”(stitchpattern#05).
3. Sewthe15piecesoftriplestitchasshownbelow.
 Besurethatthetotalstitchlengthfromthe3rdpieceto13thpieceiswithintherangeof25to27mm.
 Ifnot,adjustasfollows;
To adjust:
4.Removethecap.
•Turnthehexagonalsocketscrewinthedirectionof(A)ifthetotallengthof10piecesofthetriplestitch
 patternisshorterthan25mm.
•Turnthehexagonalsocketscrewinthedirectionof(B)ifthetotallengthof10piecesofthetriplestitch
 patternislongerthan27mm.
5.Sewthetriplestitch15piecesagainaftertheadujsutment.
 Besurethatthetotalstitchlengthfromthe3rdpieceto13thpieceiswithintherangeof25to27mm.
 Attachthecap.
Feedbalancingdial
(Standardposition)
Hexagonalsocketscrew
Cap
(A)(B)
Turnthepowerswitchon. TheLEDdisplaywill
indicate“01”.
Pressthestitchlength
adjustingkey 4 times to
displaythe“05”.
Pressthe start/stop
button .
Feedlaguratorplate
Sewthetriplestitch15piecesagainafter
theadujsutment.
25 to 27 mm

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X
Threaderplatesupporter
Setscrew
Threader
positioning
plate
FIG. 3
Pin
Adjustmentofleftorrightdirection
Threaderplate
Hexagonalsocketscrew
Nut
Viewfrom"X"
Verticaladjustment
FIG. 2
FIG. 1
REPLACEMENT AND ADJUSTMENT OF THE NEEDLE THREADER PLATE
Ifthehookofthethreaderplateisdamaged,changeandadjustthepartasfollows:
TO CHANGE THE THREADER PLATE:
1. Pushdowntheneedlethreaderknobandpullthethreaderplatesupporterdowntoremoveit(seeFIG1).
2. Toinstalltheneedlethreaderplate,linethegrooveupwiththepinandpushituptosnapt.
TO ADJUST THE THREADER PLATE POSITION:
3. If the hook on the threader positioning plate touches the top or bottom side of the needle hole, loosen
hexagonalsocketscrewandadjustthehookposition(FIG.2).
4. Ifthehookonthethreaderplatetouchestheleftorrightsideoftheneedlehole,loosensetscrewandadjust
thehookposition(FIG3).
Replacingthethreaderplatesupporter
(withthethreaderplateattached)
MECHANICAL ADJUSTMENT

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TO ENTER SELF-DIAGNOSTIC MODE:
Preparation:
 1.Turnthepowerswitchoff.
 2.Movethebobbinwinderspindletotheleft.
 3.Raisethefeeddog.
 4.Setthespeedcontrollevertotheleft.
 5.Removethepresserfootandraisethepresserfootlifter.
 6.Turnthehandwheeltowardyoutoraisetheneedletoitshighestposition.
NOTE:
 •Becareful:thesewingmachinemaystartrunninginitsownwhileintestmode.
 •Turnoffthepowerswitchbeforereplacinganyparts.
 •Repeatthediagnostictestuntiltheproblemhasbeenresolved.
To begin:
 Turnontheswitch.Ifanyofthefollowingproblemsoccur,taketherecommendedactionsintheorderthey
 areshown.
1.Themachinedoesnotrespondwhenthepowerswitchisturnedon:
 •Checkeachconnectorconnection.
 •Replacetheswitchingregulator(withthemachinesocket).
 •ReplacetheprintedcircuitboardA.
2.Thesewingmachinelampdoesnotlightup:
 •BesureallconnectorsareconnectedtothecircuitboardLandAproperly(Refertopage23).
 •ReplacetheprintedcircuitboardL.
 •ReplacetheprintedcircuitboardA.
SELF-DIAGNOSTIC TEST
1. Turnthepowerswitchonwhile
  simultaneouslypressingauto-lock
  buttonandneedleup/downbutton.
2. TheLEDdisplay
  willindicate“ 1”.
3. Pressthe MODEkey
to enterthe
  self-diagnosticmode.