Trouble Shooting Guide - JUKI MO-1000 Instruction Manual

Trouble shooting guide

Problem
The machine does • Looper or cloth plate cover is open.
not sew: • The main switch is not on.
• The machine is not plugged in.
Fabric does not • Differential feed is wrongly adjusted.
feed evenly • Presser foot pressure is too low.
Thread breaks • Thread tension is too tight for the thread being
used.
• The machine is not threaded correctly.
• Needles are incorrectly inserted.
• Wrong needles.
Needles break • Needles are bent or blunt, points are damaged.
• Needles are not inserted correctly.
• Fabric was pulled while sewing.
Skipped stitches • Needles are bent or blunt.
• Wrong needles used.
• Presser foot pressure is too low.
Poor stitch forma- • Threads are not correctly between the tension
tion dials.
• Thread has got caught.
• Machine is incorrectly threaded.
Seams flute or • Fabric was pulled while sewing.
wave, especially • Presser foot pressure is too tight.
when sewing knits • Differential feed is set incorrectly.
Seams pucker • Needle thread tension is too tight.
• Differential feed is set incorrectly.
Fabric edges curl • Too much fabric is in the stitch.
• Thread tension is too tight.
• Stitch selection lever is on roll hem.
Thread loops are • Too little fabric in the stitch.
too loose
Motor failure • Noise is heard.
• Motor does not turn at all.
• Sparks are abnormally large.
Needle eyelet can- • The "
not be threaded not aligned with the "
wheel.
Upper and lower • When the handwheel is not fixed.
loopers cannot be
threaded • When the thread is not inserted into the bottom of
the threading hole.
• When the thread is not slacked before the thread-
ing hole.
• When the thread is caught somewhere in the
thread path.
• When the pipe is clogged with lint.
Cause
" marking on the side of the front cover is
" marking on the hand-
Solution
• Close the looper or the cloth plate cover.
• Switch machine on. (Main switch to "I")
• Insert plug into main socket.
• Check the differential feed setting.
• Adjust the presser foot pressure.
• 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.
• Replace needles.
• Insert needles fully into needle clamp with
flat side to the back.
• Guide fabric gently with both hands.
• Replace the needles.
• Use needle system 130/705H or JLx2.
• Increase presser foot pressure.
• 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.
• Guide fabric gently.
• Reduce presser foot pressure.
• Adjust differential feed to N - 2.
• Reduce the needle thread tension.
• Adjust differential feed to 0.7 - N.
• Reduce cutting width.
• Reduce thread tension.
• Set selection lever to overlock.
• Increase the cutting width.
• Replace the carbon brush with a new one.
(Note) Contact your distributor to ask for the
replacement of the carbon brush.
• Turn the handwheel to align the "
ing on it with the " " marking on the side
of the front cover.
• 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 looper
threader supplied in the accessory bag to
remove the lint in the pipe.
Page
13
13
11
24
28
39
32
18
18
19
18
--
18
18
28
29
29
32
32
--
28
24, 25
39
24, 25
23
39
27
23
--
" mark- 34, 35
32, 33
32, 33
32, 33
--
36
50