Trouble Shooting Guide - JUKI MO-1200QVP Manual De Instrucciones

Trouble shooting
Problem
The machine • The main switch is not on.
does not sew • The machine is not plugged in.
Fabric does not • Differential feed is adjusted incorrectly.
feed evenly • Presser foot pressure is too low.
• Lower or upper knife is too blunt or
wrongly positioned.
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.
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 for- • Threads are not correctly between the
mation tension discs.
• Thread has got caught.
• Machine is threaded incorrectly.
Seams flute or • Fabric was pulled while sewing.
wave, especially • Presser foot pressure is too high.
when sewing • Differential feed is set incorrectly.
knits
Seams pucker • Needle thread tension is too high.
• Differential feed is set incorrectly.
Fabric edges curl • Too much fabric is in the stitch.
• Thread tension is too high.
• Stitch selection lever is on roll hem.
Thread loops are • Too little fabric in the stitch.
too
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Cause Solution
• Switch machine on. (power switch to "I").
• Insert plug in main socket.
• Check the differential feed setting.
• Adjust the presser foot pressure.
• Replace the upper or lower knife.
• Reduce thread tension.
• Check the threading.
• Insert needles fully into needle clamp, with
the flat side to the back.
• Use the needle system 130/705H.
• Replace needles.
• Insert needles fully into needle clamp, with
the flat side to the back.
• Guide fabric gently with both hands.
• Replace the needles.
• Use needle system 130/705H.
• 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.
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