Janome JF1018S User manual

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.

9
NEEDLE SWING
Correct setting
If the timing of needle swing is not correctly adjusted, the needle will move sidewise while it
is in the fabric. Ideally the needle should start swing from a position 2- 3 mm above the
needle plate in its right outflow with maximum zigzag width.
To adjust
1. Set the pattern selector dial with maximum zigzag width, and remove the front cover.
(See page 4.)
2. Loosen two set screws.
3. Adjust the needle swing by turning the balance wheel, while pressing the worm so as
not to rotate it, until the needle swing starts at 2 - 3mm on the Needle plate after the
needle has come out of the right side of the needle hole.
4. Tighten two set screws.
5. Attach the front cover.
Note: After adjusting the needle swing, check that the upper shaft worm and gear rotate
smoothly with minimum backlash between them.

10
NEEDLE DROP
Correct setting
When the needle swings in maximum zigzag width, the distance between the both
Ends of needle hole on the needle plate and the needle drop positions should be equal.
If not. Make adjustment as follows:
To adjust
1. Remove the face plate. (See page 3.)
2. Set the pattern selector dial at maximum zigzag width.
3. Loosen the set screw.
4. Turn the eccentric pin to adjust the needle drop position.
5. Tighten the set screw.
6. Attach the face plate.
Note: check the hook timing after this adjustment.

11
HEIGHT OF FEED DOG
Correct setting
Lower the presser foot and turn the balance wheel toward you until the
Needle bar comes to the highest point of its travel.
In this condition, the height of the feed dog above the needle plate should be 0.75 -
0.90mm. If it is not in the range, make adjustment as follows:
To adjust
1. Set the stitch length dial at (4). (pattern select dial at any position.)
2. Lower the presser foot and turn the balance wheel until the feed dog comes to its
highest point.
3. Loosen the set screw A.
4. Turn the feed lifting pin to adjust the height of feed dog (0.75 - 0.90mm).
5. Tighten the set screw A.
6. Turn the balance wheel to recheck the height of feed dog.
* Raise needle to its highest position.

12
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.1)
Correct setting
The clearance between needle and shut1le race should be 0-0.15mm.
If not, make adjustment as follows:
Toadjust
1. Remove the face plate. (See page 3.)
2. Set the pattern selector dial at “B”. (stitch length dial at any position.)
3. Loosen set screw A, and move the needle bar supporter to arrows to get clearance
between 0 and 0.15mm.
* When clearance is too wide, move the needle bar supporter to direction B.
* When clearance is too narrow, move the needle bar supporter to direction C.
Note: After this adjustment, check if the clearance between needle and Needle plate is
more than 0.15mm as shown in figure D. If not, adjust the clearance between
needle and shuttle race by using method of adjustment No.2 in page 13 after
readjust the clearance between needle and needle plate more than 0.15mm.
4. Attach the face plate.

13
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2)
Use this adjustment No.2 when adjustment No.1 can not be used.
Correct setting
The clearance between needle and shuttle race should be 0 - 0.15mm.
To adjust
1. Set the pattern selector dial at “B”. (stitch length dial at any position.)
2. Loosen the screw A on lower shaft bushing and slide the gear about 0.5mm to the right
to make a slack between gears.
3. Lower the needle and loosen the two set screws B.
Move the shuttle race unit axially either forward or backward to adjust the clearance
between the needle and the shuttle race in the range of 0-0.15mm.
4. Set the pattern select dial at” C “, and turn the balance wheel to check if the Clearance
between the needle and inner edges of the shuttle race spring at the left and right
needle drops are equal. If not, adjust it by turning the shuttle race unit.
5. Tighten the two set screws B.
6. Loosen the set screw on lower shaft bushing and slide the gear back to the original
position while adjusting the backlash.
7. Tighten the screws a firmly.
8. Attach the rear cover.
Note: The backlash play should be less than 0.3mm and lower shaft turns smoothly.
After the adjustment, check the hook timing.

14
NEEDLE BAR HEIGHT
Correct setting
The distance between the upper edge of needle eye and the tip of shuttle hook should be
in the range of 2.9 - 3.5mm when the tip of shuttle hook meets the left side of the needle in
ascending travel of needle from its left and lowest position.
To adjust
1. Remove the face plate. (See page 3.)
2. Set the pattern selector dial at “B”. (stitch length dial at any position.)
3. Remove the shuttle race ring.
4. Turn the balance wheel toward you until tip of shuttle hook meets the left side of the
needle.
5. Loosen the needle bar connecting stud set screw.
6. Adjust the height of the needle bar by moving the needle bar upward or downward
withoutturning it.
7. Tighten the set screw.
8. Attach the shuttle race ring.
9. Attach the face plate.

15
HOOK TIMING
Correct setting
The standard height of needle point from its lowest point of travel should be in the range of
1.45 -1.95mm when the tip of shuttle hook meets exactly the left side of needle at left
needle position.
To adjust
1. Set the pattern selector dial at “B”.
2. Remove the front panel cover unit.
3. Remove the motor.
4. Remove the shuttle race ring.
5. Turn the balance wheel toward you until the tip of shuttle hook meets the left side of
needle.
6. Loosen the set screws A.
7. While holding the shuttle hook not to turn, turn the balance wheel toward you until the
needle comes to its lowest position. Then, further turn the balance wheel to raise the
needle about 1.7mm from its lowest position.
8. Tighten the set screws.
9. Turn the balance wheel toward you to check if the height is the range of 1.45-
1.95mm.
If it is not in the range, repeat the above procedure.
10. Attach the shuttle race ring.
11. Attach the motor and adjust the belt tension.
12. Attach the front panel cover unit.

16
FEED BALANCE ON STRETCH STITCH
Correct setting
If the stretch stitches are distorted, adjust it as follows:
To adjust
1. Remove the cap.
2. Set the pattern selector dial at” A “, and the stitch length dial at “SS”.
3. Turn the stretch stitch adjusting screw in the direction of “C” when A> B, or in the
direction of “D” when A < B.
4. Attach the cap.

17
BUTTONHOLE FEED BALANCE
Correct setting
When sewing buttonhole, the stitches on each side of buttonhole should be the same stitch
density.
The range of 9 -11 stitches in the right side row (backward feeding) against 10 stitches in
the left side row (forward feeding) is considered acceptable.
To adjust
1. Check the stitches by sewing buttonholes, and remove the cap.
2. Turn the adjusting screw in the direction of “C” in case of a (right stitches are coarse), or
in the direction of “D” in case of B (left stitches are coarse).
3. Attach the cap.

18
BARTACK FEED OF BUTTONHOLE
Correct setting
When bartack of buttonhole is sewn, the material should not be fed.
To adjust
1. Set the pattern selector dial at “ “ and the stitch length dial at “4”.
2. Remove the front cover. (See page 4.)
3. Place a piece of paper under the foot and turn the balance wheel.
If the paper is fed forward, turn the adjusting screw in the direction of “C”.
If the paper is fed backward, turn the adjusting screw in the direction of “D”.
4. Attach the front cover.