Operation Manual

Trouble shooting
Problem Cause Solution Page
The machine
does not sew
• The main switch is not on.
• The machine is not plugged in.
• Switch machine on. (power switch to “I”).
• Insert plug in main socket.
8
7
Fabric does not
feed evenly
• Differential feed is adjusted incorrectly.
• Presser foot pressure is too low.
• Lower or upper knife is too blunt or
wrongly positioned.
• Check the differential feed setting.
• Adjust the presser foot pressure.
• Replace the upper or lower knife.
21
24
26
Thread breaks • Thread tension is too tight for the thread
being used.
• The machine is not threaded correctly.
• Needles are inserted incorrectly.
• Wrong needles used.
• Reduce thread tension.
• Check the threading.
• Insert needles fully into needle clamp, with
the at side to the back.
• Use the needle system 130/705H.
19
13-17
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
the at side to the back.
• Guide fabric gently with both hands.
11
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.
• Increase presser foot pressure.
11
11
24
Poor stitch for-
mation
• Threads are not correctly between the
tension discs.
• Thread has got caught.
• Machine is threaded incorrectly.
• 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.
12
9
13-17
13-17
Seams ute or
wave, especially
when sewing
knits
• Fabric was pulled while sewing.
• Presser foot pressure is too high.
• Differential feed is set incorrectly.
• Guide fabric gently.
• Reduce presser foot pressure.
• Adjust differential feed to N-2.
--
24
21
Seams pucker • Needle thread tension is too high.
• Differential feed is set incorrectly.
• Reduce the needle thread tension.
• Adjust differential feed to 0.7-N.
19
21
Fabric edges curl • Too much fabric is in the stitch.
• Thread tension is too high.
• Stitch selection lever is on roll hem.
• Reduce cutting width.
• Reduce thread tension.
• Set selection lever to overlock.
20
19
23
Thread loops are
too
• Too little fabric in the stitch. • Increase the cutting width. 20
27