Jack JK-SHIRLEYIIE, Operation And Daily Service Manual

the fabric not flat enough

bottom thread is break

needle break

Whether the presser foot pressure is too weak

To adjust the pressure of presser foot

High-low about the feed dog , whether not flatness 

To adjust the feed dog height and parallelism

Whether the bottom thread is suitable

To adjust the bottom thread tight

Whether the needle is bended

To change the needle

Whether the needle installed well

To install the needle correctly

Whether threading correctly
To threading in right way

Bottom thread is too tight 

To adjust the tension of bottom thread.

Whether the hook and needle have well matched 

To adjust the hook and needle match well

Whether the needle installed well

To install the needle correctly

Whether the hook and needle have well matched 

To adjust the hook and needle match well

Whether the knife position and moveing time is right

To adjust the trimmer position in right way

Whether the needle size is appropriate

To choose the right needle

upper thread is not tight
enough

bottom thread is not 
tight enough

the thread loose under the 
fabric

skipped stitching during 
sewing

skipped stitching when 
starting sewing

The tension of upper thread is weak, or the tension 
of bottom thread is too strong.

To adjust the tension of upper thread or bottom thread.

The tension of bottom thread is weak, or the tension 
of upper thread is too strong.

To adjust the tension of upper thread or bottom thread.

Whether the thread line is smooth or not

To polish the thread line

Whether the needle is bended

To change the needle

Whether the needle installed well

To install the needle correctly

Whether threaded correctly
To thread in right way

Whether the presser foot pressure is too weak

To adjust the pressure of presser foot

Whether the needle is suitable for the fabric
To change a better needle which is suitable for the 
fabric

Whether the upper thread is too short after trimming

To adjust the thread tension or trimming time, make 
the upper thread longer

Whether the speed of starting sewing is too fast

To adjust the speed of starting sewing

Whether the bottom thread is too short or moveble
knife and fixed knife has burr after trimming 

To deburred the 

 knife and fixed knife, 

and adjust the stopper spring.

moveble

Common sewing fault

Attachment 2

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