JUKI MO-3500 - Trouble Shooting Guide

41
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 cov-
er.
• Switch machine on. (Main switch to “I”)
• Insert plug into main socket.
12
12
11
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.
19
21
Thread breaks • The machine is not threaded correctly.
• Needles are incorrectly inserted.
• Wrong needles.
• Stitch setting is wrong.
• Check the threading.
• Insert needles fully into needle clamp
with at side to the back.
• Use needle system 130/705H or JLx2.
• Check the stitch setting.
25
15
15
9
Needles break • Needles are bent or blunt, points are dam-
aged.
• Needles are not inserted correctly.
• Fabric was pulled while sewing.
• Stitch setting is wrong.
• Replace needles.
• Insert needles fully into needle clamp
with at side to the back.
• Guide fabric gently with both hands.
• Check the stitch setting.
16
15
--
9
Skipped stitches • Needles are bent or blunt.
• Wrong needles used.
• Presser foot pressure is too low.
• Stitch setting is wrong.
• Replace the needles.
• Use needle system 130/705H or JLx2.
• Increase presser foot pressure.
• Check the stitch setting.
15
15
21
9
Poor stitch for-
mation
• Threads are not correctly between the thread
guide No. 1.
• Thread has got caught.
• Machine is incorrectly threaded.
• Stitch setting is wrong.
• Check if thread is tting between the
thread guide No. 1.
• Raise the presser foot and pull the
thread.
• Check threading path of each thread.
• Check threading path of each thread.
• Check the stitch setting.
23
23
25
25
9
Seams ute or
wave, especially
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.
--
21
19
Seams pucker • Di󰀨erential feed is set incorrectly. • Adjust di󰀨erential feed to 0.7 - N. 19
Fabric edges
curl
• Too much fabric is in the stitch.
• Stitch selection lever is on roll hem.
• Reduce cutting width.
• Set selection lever to overlock.
17
20
Thread loops are
too loose
• Too little fabric in the stitch. • Increase the cutting width. 17