35
Trouble shooting guide
Problem
Cause
Solution
Page
The machine
does not sew:
•
Looper or cloth plate cover is open.
•
The main switch is not on.
•
The machine is not plugged in.
• Close the looper or the cloth plate cover.
• Switch machine on. (Main switch to “I”)
• Insert plug into main socket.
8
8
7
Fabric does not
feed evenly
•
Differential feed is wrongly adjusted.
• Presser foot pressure is too low.
•
Check the differential feed setting.
• Adjust the presser foot pressure.
15
17
Thread breaks
•
Thread tension is too tight for the thread being
used.
• The machine is not threaded correctly.
• Needles are incorrectly inserted.
• Wrong needles.
•
Reduce thread tension.
•
Check the threading.
•
Insert needles fully into needle clamp with
flat side to the back.
•
Use needle system 130/705H or JLx2.
26
20
11
11
Needles break
•
Needles are bent or blunt, points are damaged.
• Needles are not inserted correctly.
• Fabric was pulled while sewing.
•
Replace needles.
• Insert needles fully into needle clamp with
flat side to the back.
• Guide fabric gently with both hands.
12
11
--
Skipped stitches
•
Needles are bent or blunt.
• Wrong needles used.
• Presser foot pressure is too low.
•
Replace the needles.
• Use needle system 130/705H or JLx2.
• Increase presser foot pressure.
11
11
17
Poor stitch forma-
tion
•
Threads are not correctly between the tension
dials.
• Thread has got caught.
• Machine is incorrectly threaded.
•
Check if thread is lying between tension
discs.
• Raise the presser foot and pull the thread.
• Check threading path of each thread.
• Check threading path of each thread.
18
18
20
20
Seams flute or
wave, especial-
ly when sewing
knits
•
Fabric was pulled while sewing.
• Presser foot pressure is too tight.
• Differential feed is set incorrectly.
•
Guide fabric gently.
• Reduce presser foot pressure.
• Adjust differential feed to N - 2.
--
17
15
Seams pucker
•
Needle thread tension is too tight.
• Differential feed is set incorrectly.
•
Reduce the needle thread tension.
• Adjust differential feed to 0.7 - N.
26
15
Fabric edges curl •
Too much fabric is in the stitch.
•
Thread tension is too tight.
•
Stitch selection lever is on roll hem.
•
Reduce cutting width.
• Reduce thread tension.
• Set selection lever to overlock.
13
26
16
Thread loops are
too loose
•
Too little fabric in the stitch.
•
Increase the cutting width.
13
Motor failure
• Noise is heard.
• Motor does not turn at all.
• Sparks are abnormally large.
• Replace the carbon brush with a new one.
(Note)
Contact your distributor to ask for the
replacement of the carbon brush.
--
Needle eyelet
cannot be thread-
ed
• The “ ” marking on the side of the front cover
is not aligned with the “ ” marking on the
handwheel.
• Turn the handwheel to align the “ ”
marking on it with the “ ” marking on the
side of the front cover.
22,23
Upper and lower
loopers cannot be
threaded
• When the handwheel is not fixed.
• When the thread is not inserted into the bottom
of the threading hole.
• When the thread is not slacked before the
threading hole.
• When the thread is caught somewhere in the
thread path.
• When the pipe is clogged with lint.
• Raise the threading changeover lever and
turn the handwheel to fix it.
• Insert the thread into the threading hole
by 1 to 2 cm.
• Slack the thread before the threading
hole.
• Remove the thread from the location
where it has been caught.
• Thread the loopers by means of the loop-
er threader supplied in the accessory bag
to remove the lint in the pipe.
20,21
20,21
20,21
--
24
Summary of Contents for MO-2800
Page 39: ......
