Janome 3128 Manual de usuario
SERVICE MANUAL
MODEL 3128
CONTENTS
WHAT TO DO WHEN ......................................................................................1-3
SERVICE ACCESS
FACE COVER .................................................................................... 4
REAR COVER ................................................................................... 5
FRONT COVER ................................................................................. 6
MECHANICAL ADJUSTMENT
TOP TENSION ................................................................................... 7
BOBBIN TENSION ............................................................................. 8
PRESSER BAR HEIGHT AND ALIGNMENT ..................................... 9
NEEDLE SWING .............................................................................. 10
NEEDLE DROP ............................................................................... 11
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.1) ................. 12
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2) ................. 13
FEED DOG HEIGHT ........................................................................ 14
NEEDLE BAR HEIGHT .................................................................... 15
NEEDLE TIMING TO SHUTTLE ...................................................... 16
BUTTONHOLE FEED BALANCE .................................................... 17
ADJUSTMENT OF RIGHT HAND LINE TACK WIDTH
AND CAM FOLLOWER RELEASE AMOUNT ............... 18
MOTOR BELT TENSION ................................................................. 19
WIRING ............................................................................................................. 20
OILING .............................................................................................................. 21
MODEL 3128
1
CONDITION CAUSE HOW TO FIX REFERENCE
1. Skipping 1. Needle is not inserted Insert the needle properly.
properly.
stitches 2. Needle is bent or worn. Change the needle.
3. Incorrectly threaded. Rethread.
4. Needle or thread are Use the recommended sewing
inappropriate for fabric needle and thread.
being sewn.
5. Sewing on stretch fabric. Use a #11 blue tip needle.
6. Inappropriate needle bar See mechanical adjustment P.15
height. “Needle bar height.”
7. Inappropriate needle to See mechanical adjustment P.16
hook timing. “Needle timing to shuttle.”
8. Inappropriate needle to See mechanical adjustment P.12,13
hook clearance. “Clearance between needle
and hook.”
2. Fabric not 1. Incorrect feed dog height. See mechanical adjustment P.14
moving “Feed dog height.”
2. Thread on bottom side of Make sure to bring both needle
fabric is jammed up. and bobbin threads under the
foot when starting sewing.
3. Feed dog teeth are worn. Change the feed dog.
WHAT TO DO WHEN
MODEL 3128
2
CONDITION CAUSE HOW TO FIX REFERENCE
3. Breaking 1. Initial sewing speed is Start with medium speed.
upper too fast.
thread 2. Thread path is incorrect. Use the proper thread path.
3. Needle is bent or dull. Replace with a new needle.
4. Upper thread tension is Adjust upper thread tension P.7
too strong. correctly.
5. Needle size is inppropriate Use appropriate needle and
for fabric. thread for fabric in use.
6. Needle eye is worn. Change the needle.
7. Needle hole in needle Repair the hole or replace the
plate is worn or burred. needle plate.
4. Breaking 1. Incorrectly threaded Thread bobbin case correctly.
bobbin bobbin case.
thread 2. Too much thread is Adjust the position of stopper.
wound on the bobbin.
3. Lint is stuck inside the Clean the hook race.
hook race.
4. Thread quality is too low. Change to a high quality
sewing thread.
5. Thread is jamming around Clear out the jamming thread.
the bobbin.
6. Bobbin thread tension is Adjust bobbin thread tension P.8
too strong. correctly.
MODEL 3128
3
CONDITION CAUSE HOW TO FIX REFERENCE
5. Needle 1. Needle is hitting the needle See mechanical adjustment P.11
breaks plate. “Needle drop.”
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the hook See mechanical adjustment P.12, 13
race. “Clearance between needle
and hook”.
4. The fabric moves while the See mechanical adjustment P.10
needle is piercing it, or the “Needle swing”.
needle zigzags while in
fabric.
5. Fabric is being pulled too Guide the fabric gently
strongly while sewing. while sewing.
6. Noisy 1. Backlash between shuttle See mechanical adjustment P.13
Operation hook gear and lower shaft “Clearance between needle
gear is too great. and hook (No.2)”.
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See mechanical adjustment P.19
“Motor belt tension”.
4. Upper shaft gear is loose. Eliminate the looseness.
5. Not enough oil. Oil all moving parts.
7. Deformation 1. Inappropriate zigzag See mechanical adjustment P.10
pattern synchronization. “Needle swing”.
2. Inappropriate See mechanical adjustment P.18
disengagement of cam “Disengagement of cam”.
follower.
3. Upper thread tension is Adjust upper thread tension P.7
too strong. correctly.
MODEL 3128
4
SERVICE ACCESS
TO REMOVE
1. Remove the setscrew "A".
2. Take the face cover "B" off.
Note: When removing the face cover, pull it up and unhook from the hook "C".
TO ATTACH
3. Follow the above procedure in reverse.
C
A
B
FACE COVER
MODEL 3128
5
SERVICE ACCESS
REAR COVER
TO REMOVE
1. Remove the face cover (see page 4).
2. Remove the setscrews "A", "B", "C", "D", "E" and rubber cushion "F" (2 pcs.), and then
remove the rear cover.
TO ATTACH
3. Follow the above procedure in reverse.
A
REAR COVER
C
F
D
F
B
E
MODEL 3128
6
SERVICE ACCESS
FRONT COVER
TO REMOVE
1. Remove the face cover and rear cover (see pages 4, 5.)
2. Pull out the pattern selector dial.
3. Loosen the setscrews "A", "B" and remove the setscrews "C", "D" and the rubber cushion
"E", then remove the front cover.
TO ATTACH
4. Follow the above procedure in reverse.
A
BE
D
C
PATTERN SELCTOR DIAL
MODEL 3128
7
AB
D
C
TOP TENSION
TO CHECK:
The standard upper thread tension should be 65 - 95g when pulling the thread (cotton thread #50)
in the direction of "A" with setting the tension dial at "3". (Make sure the foot should be lowered.)
If the tension is out of the standard range, adjust it as follows:
ADJUSTMENT PROCEDURE:
1. Remove the front cover (see page 6).
2. Turn the adjusting nut "B" in the direction of "C" when the upper thread tension is too tight.
Turn the adjusting nut "B" in the direction of "D" when the upper thread tension is too loose.
3. Attach the front cover.
MECHANICAL ADJUSTMENT
MODEL 3128
8
BOBBIN TENSION
TO CHECK:
Set the bobbin in the bobbin case and pass the thread (cotton #50) through the tension spring.
The bobbin thread tension should be 45 - 55g when pulling the thread in the direction of "A".
If the tension is out of the range, adjust it as follows:
ADJUSTMENT PROCEDURE:
1. Turn the adjusting screw "B" in the direction of "C" when the bobbin thread tension is too
tight.
2. Turn the adjusting screw "B" in the direction of "D" when the bobbin thread tension is too
loose.
MECHANICAL ADJUSTMENT
COTTON THREAD #50
A
B
C
D
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