Janome JF1018S Manuale utente

SERVICING MANUAL

Model JF1018S

CONTENTS

WHAT TO DO WHEN............................................................................................... 1-2

SERVICE ACCESS

Face plate .............................................................................................................3

Belt cover ..............................................................................................................3

Bed base plate ......................................................................................................3

Front cover ............................................................................................................4

Rear cover .............................................................................................................5

MECHANICAL ADJUSTMENT

Upper thread tension dial .......................................................................................6

Bobbin thread tension............................................................................................7

Presser bar height and alignment...........................................................................8

Needle swing.........................................................................................................9

Needle drop.........................................................................................................10

Height of feed dog ...............................................................................................11

Clearance between needle and hook (No.1).........................................................12

Clearance between needle and hook (No.2).........................................................13

Needle bar height ................................................................................................14

Hook timing .........................................................................................................15

Feed balance on stretch stitch..............................................................................16

Buttonhole feed balance.......................................................................................17

Bar-tack feed of buttonhole ..................................................................................18

Disengagement of cam follower...........................................................................19

Buttonholefunction...............................................................................................20

Motor belt tension ................................................................................................21

WIRING ......................................................................................................................22

WHAT TO DO WHEN

CONDITION

1. Skipping

stitches

2. Fabric not

moving

3.Breaking

upperthread

4.Breaking

bobbin

thread

CAUSE

1. Needle is not inserted

properly.

2. Needle is bent or worn.

3. Incorrectly threaded.

4. Needle or thread is

inappropriate for fabric being

sewn.

5. Sewing on stretch fabric.

6. Inappropriateneedlebar

height.

7. Inappropriate needle to hook

timing.

8. Inappropriate needle to hook

clearance.

1. Incorrect feed dog height.

2. Thread on bottom side of

fabric is jammed up.

3. Feed dog teeth are worn.

1. Initial sewing speed is too

fast.

2. Thread path is incorrect.

3. Needle is bent or dull.

4. Upper thread 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.

1. Incorrectly threaded bobbin

case.

2. Too much thread is around on

the bobbin.

3. Lint is stuck inside the bobbin

holder.

4. Thread quality is too low.

5. Thread is jamming around the

bobbin.

6. Bobbin thread tension is too

strong.

HOWTO FIX

Insert the needle properly.

Change the needle.

Rethread.

Use the recommended sewing

needle and thread.

Use a size 11 blue tip needle.

See mechanical adjustment

“Needle bar height”.

See mechanical adjustment “Hook

timing”.

See mechanical adjustment

“Clearance between needle and

hook”.

See mechanical adjustment

“Height of feed dog”.

Make sure to bring both needle and

bobbin thread under the foot when

starting sewing.

Change the feed dog.

Start with medium speed.

Use the proper thread path.

Replace with a new needle.

Adjust upper thread tension

correctly.

Use appropriate needle for fabric

and thread in use.

Change the needle.

Repair the hole or replace the

needle plate.

Thread bobbin case correctly.

Adjust the pos1tion of stopper.

Clean the hook race.

Change to a high quality sewing

thread.

Clear out the jamming thread.

Adjust bobbin thread tension

correctly.

REFERENCE

P.14

P15

P12.13

P11

P.6

P.7

CAUSE

1.Needle is hitting the needle

plate.

2.Needle is bent or worn.

3.Needle is hitting the hook race.

4.The fabric moves while the

needle is piercing it, or the

needle swings while in fabric.

5.Fabric is being pulled too

strongly while sewing.

1.Backlash between shuttle hook

gear and lower shaft gear is too

much.

2.Lower shaft gear is loose.

3.Inappropriate belt tension.

4.Upper shaft gear is loose

5.Not enough oil.

1.Inappropriatezigzag

synchronization.

2.Inappropriatedisengagementof

cam follower.

3.Upper thread tension is too

strong.

4.Inappropriatefeed balance.

CONDITION

5.Needle

breaks

6.Noisy

operation

7.Deformation

pattern

HOWTO FIX

See mechanical adjustment

“needledrop.”

Change the needle.

See mechanical adjustment

“Clearance between needle and

hook”.

See mechanical adjustment

“Needleswing”

Guide the fabric gently while

sewing.

See mechanical adjustment

“Clearance between needle and

hook (No. 2)”.

Eliminate the looseness.

See mechanical adjustment

“Motor belt tension”.

Eliminate the looseness.

Oil all moving parts.

See mechanical adjustment

“Needleswing”.

See mechanical adjustment

“Disengagement of cam follower”.

Adjust upper thread tension

correctly.

See mechanical adjustment

“Feed balance on stretch stitch”.

REFERENCE

P.10

P.12.13

P.9

P.13

P.21

P.9

P.19

P.6

P.16

FACE PLATE

To remove

1. Remove the face plate by removing the cap and set screw.

To attach

2. Attach the face plate by the set screw. Then, attach the cap.

BELT COVER

To remove

1. Loosen the set screw, and remove the belt cover by removing the belt cover rib from

thefront cover.

To attach

2. Attach the belt cover rib to the front cover. And then, Attach the belt cover by the set

screw.

BASE COVER

To remove

1. Remove the base cover by four set screws.

To attach

2. Attach the base cover by four set screws.

FRONT COVER

To remove

1. Remove the face plate and belt cover. (See page 4.)

2. Remove selector dials (A) and (B).

3. Loosen set screws (C), (D), (E), (Ff), (G), and then, remove the front cover by

removing set screws (H), (I), and (J),

To attach

4. Attach the front cover in reverse procedure of the removing.

REAR COVER

Rear cover could be removed without removing first front cover.

To remove

1. Remove the belt cover (See page 3).

2. Loosen the set screws A and B and remove the cap H.

3. Remove the set screws C, D, E, F and G.

4. Pull up the 2 spool pins I and J and lower the presser foot lifter K.

5. While pushing the rear cover l near the notches L and M, pull upper part of the rear

cover (See X below).

6. Pull lower part of the rear cover toward you and slide it to the left (See Y and Z below).

While sliding the rear cover to the left, remove the presser bar lifter K

UPPER THREAD TENSION DIAL

Correct setting

The upper thread tension should be 65 - 95g when pulling the thread (cotton thread Size

50) in the direction of B with setting the tension dial at “3”.

(Make sure the foot is lowered.)

If the tension is out of the standard range, adjust it as follows:

To adjust

1. Remove the front panel cover unit. (See page 4.)

2. Turn the adjusting nut C in the direction of D when the upper thread tension is too

tight.

Turn the adjusting nut C in the direction of E when the upper thread tension is too

loose.

3. Attach the front panel cover unit.

BOBBIN THREAD TENSION

CORRECT SETTING

Set the bobbin in the bobbin case and pass the thread (cotton size 50) through the tension

spring. The bobbin thread tension should be 45 - 55g when pulling the thread in the

direction of B. If the tension is out of the range, adjust it as follows:

To adjust

1. Turn the adjusting screw “C” in the direction of “D” when the bobbin thread tension is

too tight.

2. Turn the adjusting screw “C” in the direction of “E” when the bobbin thread tension is

too loose.

PRESSER BAR HEIGHT AND ALIGNMENT

Correct setting

When presser foot lifter is up position, the distance between the bottom surface of the foot

and needle plate should be 6.0mm.

To adjust

1. Remove the face plate. (See page 3.)

2. Remove set screw A and remove lamp holder set plate.

3. Raise the presser foot and loose the presser bar bracket screw and adjust the height

(6.0mm).

4. Check if the presser foot is parallel to the openings for the feed dog on the needle

plate. If not, adjust it.

5. Tighten the presser bar bracket screw while holding the presser bar to keep the foot

parallel to the openings.

6. Attach the lamp holder set plate.

7. Attach the face plate.

Indice

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