Operation Manual

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Operating Instructions 650-10 - 02.0 - 10/2015 143

11.3 Errors in sewing process

Meaning Possible causes Remedial action

Thread

breakage

• The needle and hook

threads are not threaded

correctly

• Check threading path

(

Operating Instruc-

tions, Operation)

• Needle is bent or sharp-

edged

• Needle is not inserted

correctly into the needle

bar

• Replace the needle

• Insert the needle into the

needle bar

• The needle used is

unsuitable

• Use recommended

thread (

Operating

Instructions)

• Thread tensions are too

tight for the thread used

• Check thread tensions

(

Operating Instruc-

tions, Operation)

• Thread-guiding parts

such as thread tube,

thread guide or thread-

takeup disk are sharp-

edged

• Check the thread path

• Throat plate, hook or

spread have been dam

-

aged by the needle

• Have parts reworked by

qualified specialists