Husqvarna 6690 Manuel utilisateur

SERVICE-ROUTINE

6690

Husqvarna

Directions for use

Theseserviceinstructionsareintendedtobeused

byserviceworkshoppersonnelorbysalesmenwho

carryout servicing intheirowndistricts themselves.

Theyassume athoroughknowledgeof thehandling

of precision appliances and accessibility to service

tools.

Themanualisdividedintothreesectionsand

includesall servicepoints and checks which should

becarriedoutduringa complete overhaul of a

sewingmachine.The first sectionincludesthe

controlof the a equate functioning of integral details.

Thesecond section deals with the various settings

which mustbe maintainedto ensurethat the

machinefunctions in a satisfactory way.

Thethird sectiondealswithdismounting, mounting

andsettingtheelectronic units included inthe

machine.

Thediagramsonlygiveanindicationastowhere

thedetail or mechanism mentioned is located in the

machine.Formoredetailedinformationregarding

theconstruction, etc., refer to thediagramsinthe

sparepartslist. The codings of the details referto

thesediagrams-as an example, detail 5/37 can be

seen in the spare parts list on page 5, pos. 37.

Contents Page

Visualcontrolofdetails 3-9

Settinginstructions 10-29

Electronicunits 30-44

Thefollowing details shouldbevisuallychecked

See page

Stitchplate 3

Presserfoot 3

Feed dog 3

Bobbin case 4

Hookcover 4

Hook 5

Driver 5

Cog belt 6

V-belt 6

Reductiongear 7

Terminalboard 7

Motor 8

Footcontrol 9

The stitch plate

Thestitch plate must not be damagedinanyway.

Particularattentionshouldbe paid to possible

damageor unevennessaroundtheneedle hole.

Action

Exchangethe damaged stitch plate.

Spare parts: See RA, page 4.

OrderingNo:Stitchplate: 4115628-01.

Presser foot

Requirements

Thereshould be no scratches ontheundersideofthe

presserfoot.

Action

Exchangethe presser foot if there are scratches on the

underside.

Comments

Howthefabricisheldbetweenthepresserfoot and the

stitchplate plays an important roleinthestitchformation.

Spare parts: See RA, page 22.

Ordering No: Zig-zag presser foot 411 1383-01

Utilitystitchandpatternpresserfoot411 4512-01.

The feed dog

Requirements

Theupper side of the feeddog (10/1) must notbe

damagedin any way, e.g. broken teeth, etc.,and

should befreefromfluffandpiecesofthread.

Action

Thefaulty feeddogshouldbe exchanged.Removethe

stitchplate. Undo the screws (10/2) and remove the feed

dog. As regards the setting of the feed dog in relation to

thestitch plate groove, see page 23.

Spare parts: See RA, page 10.

Ordering No: Feed dog 411 5910-01.

Upper side Underside

Zig-zag presser foot 411 1383-01

Utilitystitch andpattern

presser foot 411 4512-01.

The bobbin case

Fabricdressing may fasten under the thread tension

springand cause the thread tension to change.This

canbe removed by means of a needle, which should

beinsertedbetweenthe spring and the bobbin case.

Spare parts: See RA, page 9.

Ordering No: Bobbin case 401 1530-02.

Depositsfromthefabricorthreadcan fasten on the

spindleofthehookandcause noise. If such is the

case,the spindle shouldbecarefullycleanedwith

thebrushin the accessory box. At the same time

makesurethatpiecesofthreadwhichhavebecome

woundround the spindle are removed.Inbadcases,

exchangethe bobbin case.

Spare parts: See RA, page 9.

Ordering No: Bobbin case 401 1530-02.

The hook cover

Requirements

Theinsideofthe hook cover must not be

damaged.Bothaxial and radial movement

shouldbepossible.

Action

Exchangethe hook cover if it isdamaged.

Checkthat the holes in the hook cover are not

blockedand that the shoulder screwsandthe

holdersarenot damaged. Regarding the gap

betweenthehookcoverandthedriver,see page 21.

Comments

Theinsideofthe hook cover makes a support for

thehookandthe bridge above the finger of the bobbin

casesupportsthethread,sothatthethreadloopis

formedontherightsideoftheneedle.Thepossibility

ofmovementinthe hook cover is a prereguisite to

avoidunnecessary noise.

Spare parts: See RA, page 9.

Ordering No: Hook cover 411 6662-01.

The hook

Requirements

Thehookmustnotbedamaged.Specialattention

shouldbegiventoseethatthetiphasnot been

damagedor worn, causingburrsorunevenness.

Action

Exchangedthe damaged hook.

Spare parts. See RA, page 9.

Ordering No: Hook 401 1521-01.

The driver

Requirements

Thesurface of the driveragainstthehook must not

bedamaged, wornorunevenin any waywhich

mighthinder the passage of the thread.

Action

Thedamaged driver (9/10) should be exchanged.

Turn thehandwheeluntil theneedleisatthe highest

position.Theslotinthedriverisnowinthe middle,

underneaththe feed dog.Undothethree screws

(9/16)which holdthehookcover-remove the

hookcover andthehook. Then undothethree

screws(9/11)inthedriver, and exchange it for

anewone.Notethepositionoftheslotin the

driver.Thereafter “Thedistancebetweenthe hook

andtheneedle”shouldbecheckedaccordingto

page21,“Thegapbetweenthe hook cover and

driver”according to page 19, and“Setting the

timingforthe hook in relation to the needle”

according to page 20.

Spare parts: See RA, page 9.

Ordering No: Driver 411 6415-01.

The cog belt

Thebelttensionshouldnotbesoloosethatitpermits

slippingwhenthemachineislockedandthefoot

controlisdepressed.Tightertensionmakesmore

noise.Thebelt should not be damaged.

Adjustment

Thescrews (14/8, 9) in the reduction gear holder

areaccessibleby means of two holes inthelarge

cogwheel (14/29). If both the screws are loosened,

acertainadjustmentispossiblebymowingthe

framefor the cog wheel journal (14/20, 25, 26)

oneway ortheother.

Tightenthescrews.

Spare parts: See RA, page 14.

The V-Belt

Requirements

Thebelt tension should not be too tight or too

loose.Theslightestamountofslippingis

permissiblewhen the handwheelisheld

firmlyand the foot controldepressed.

Adjustment

Thescrews(14/8,9) in the reduction gear

holderareaccessible by means of two

holesin the large cog wheel (14/29) If

boththescrewsareloosened,acertain

adjustmentis possible by mowing the

reductiongear.

Spare parts: See RA, page 14.

The reduction gear

Somechange inthesoundlevel when usingthe

reductiongearisnormal. The gear should be

exchangedonly if thesounddeviation is very

noticeable.

Dismantling

Setthe thread take-up lever at the lowest position,

removethe handwheelandthen takeawaythebelt

guard,printed circuit and cog belt. Unscrew the

screw(14/12)inthebase plate and loosen the

screws(14/36) in the holder (14/6). The

screws(14/8,9)in the reduction gear are

accessiblethrough the holes in the large

cogbelt wheel.Removebothscrews, turn

theholder and liftoutthereductiongear.

Mountingofthereduction gear is done by placing

theframe(14/20)insidetheholderandscrewingin

thescrews (14/8, 9). Replace and tighten the screws

(14/36,14/12).Checkthatthestar lock washer is in

place(14/35)andcheck the tension. Replace the

beltguard andhandwheel,makingsure that the

threadtake-upleverisatthelowestpositionand

themetal latchonthe handwheelpointsupwards.

Spare parts: See RA, page 14.

The terminal board

Checkall connections and cables.

Ifthereisinterferenceinradio or television

receptionfrom themachine,exchangethe condenser.

The motor

Control of function

Thefunctioning of themotorcanbe checked without

dismountingtheprintedcircuit.Useaspare part circuit

andconnect it to the connections on theterminalboard

andtest the machineintheordinary way.

Themotornoiseisaffected by the load and the belt

tension.Only motorswhichhave anoiselevel

considerablydeviating from normal shouldbe

exchanged.

Dismantling

Setthe thread take-up lever at the lowest position,

removethe handwheelandthen takeawaythebelt

guard,rearcoverandthecogbelt.

Pullout theplugbythe motor andremovethe

screws(5/16)in the base plate; fold under the

connectionterminal board.Thenremove the

screws(14/36)inthe holder of the reduction gear

andlift out the motor. Mounting is done inthe

reverseorder.Checkthebelttension.Replace

andfasten the rear cover,beltguardand

handwheel,makingsurethat thethread

take-upleverisat the lowest position and that

themetal latchonthe handwheelpointsupwards.

Spare parts: See RA, page 16.

The foot control

Requirements

Thespeed shouldbecontinouslycontrollable from

100 r/min to full speed.

Theconnectors to boththewallsocketand the

terminalboradmustnot be damaged or deformed.

Action

Testthe foot controlonamachinewhich is known

tooperate normally.

Ifa satisfactory result is notobtainedexchange

the faultyfootcontrol.

Ifthe cable or plug are damaged, exchange the

damaged part.

Spare parts: See RA, page 17.

+20

-0

Setting instructions

The best results will be obtained if you make the

Settings in the following order at each service.

Contents See

page

Setting ratings 11

Gauges 11

Service tools 12

Arm shaft.

Axialplay 14

Lower shaft.

Axialplay 14

Arm shaft circuit.

The zig-zag movement of the needle 15

Needle bar frame.

The setting of the needle at right

angles to the feeding direction 16

The setting of the needle in the

feedingdirection 17

The stop, needle bar frame 18

Thehook.

The distance between the hook

and the needle 19

The timing of the hook in relation

to the needle 20

The gap between the hook cover

and the hook 21

The needle bar.

The upper position of the needle 22

The feed dog.

The stitch plate 23

The position of the feed dog in

relation to the stitch plate groove 23

The lateral setting of the feed dog 24

The height of the feed dog 24

The setting of the feed dog in

relation to the needle 25

Lowering of the feed dog 25

The presser bar.

Tangentialsetting 26

Presser foot pressure 26

Upper thread tension.

Thread tension release lever 27

Setting the thread tension knob 27

The thread take-up spring.

The spring force 28

The adjustment casing 28

The lower thread tension.

The thread tension of the bobbin case 28

The stitch length

The balance between forward

and reverse feeding

Buttonhole 29

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