16. TROUBLESHOOTING￿

￿

￿￿-￿￿. Upper thread run out

 

Cause

Check

Remedy

Page

Upper

thread

Installation position of

Adjust the installation position of upper thread

 

trimmer assembly

upper thread trimmer

trimmer assembly by moving the setting plate

 

 

 

assembly

assembly.

 

 

 

 

￿Upper thread trimmer longitudinal position

 

 

 

 

adjustment

 

 

 

 

￿Upper thread trimmer cutting depth adjustment

 

 

 

 

 

Service

 

 

 

 

manual

 

4005Q

 

Upper thread trimmer

Adjust so that the thread does not come out when

 

assembly holding force

you cut it with scissors and hold the end of the

 

 

thread between your fingers and gently swing the

 

 

assembly.

 

 

￿Bend the scissors U or replace them so that the

 

 

correct force is applied.

 

 

￿Repair any damage from striking the needle.

 

 

Cotton yarn #60

-

 

Holding force approx. 2N

 

 

4006Q

Opening cam position

Adjust the position so that the scissors do not touch

 

the opening cam when the work clamp is lowered.

76

 

 

 

 

0.5 mm

4107M

 

 

 

 

 

Tension

release End of tension release at

Use parameter number 63 to retard the tension

44

timing

the beginning of sewing

 

release timing.

 

 

 

 

 

Opening

amount

of

￿Adjust the zigzag tension discs by moving the

 

 

zigzag tension discs and

tension stud bracket in and out.

 

 

 

bar tack tension discs

 

￿Adjust the bar tack tension discs opening amount

 

 

 

 

 

to 0.5 - 1.0 mm by removing the top cover and

 

 

 

 

 

moving the tension release cam.

 

 

 

 

 

 

 

 

-

Zigzag tension

Tack tension

0.5 - 1 mm

4008Q

99

HE-800A