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
1
2
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
3
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.
4
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.
5
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
6
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.
7
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.
8
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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