JUKI MO-2800 - Trouble Shooting Guide

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
• Di󰀨erential feed is wrongly adjusted.
• Presser foot pressure is too low.
• Check the di󰀨erential 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
at 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
at 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 ute or
wave, especial-
ly when sewing
knits
• Fabric was pulled while sewing.
• Presser foot pressure is too tight.
• Di󰀨erential feed is set incorrectly.
• Guide fabric gently.
• Reduce presser foot pressure.
• Adjust di󰀨erential feed to N - 2.
--
17
15
Seams pucker • Needle thread tension is too tight.
• Di󰀨erential feed is set incorrectly.
• Reduce the needle thread tension.
• Adjust di󰀨erential 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 xed.
• 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 x 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