HE-800B
11. TROUBLESHOOTING
86
Cause Check
Remedy
Page
End of tension release at
the beginning of sewing
Use parameter number 54 to retard the timing for
changing the thread tension (increase the setting
value).
40
Tension release
timing
Opening amount of zigzag
tension discs and bar tack
tension discs
・
Adjust the zigzag tension discs by moving the
tension stud bracket in and out.
・
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.
*
Upper thread feeding
Thread take-up amount
Loosen the screw to decrease thread take-up amount
so that upper thread does not pull out of trimmer
assembly at the sewing start.
*
Needle bar height and
needle bar lift amount
(The gauge is an option
part.)
1. Adjust the needle bar height to “1” on the gauge.
2.
Adjust the needle and rotary hook timing to “2” on
the gauge.
64*
65*
Rotary hook
Thread chips on rotary
hook edge
Remove thread chips.
62
Lower thread retaining
amount
Adjust the lower thread retaining amount.
*
Lower thread snapping
Adjust the positions of the lower thread retainer, lower
thread clamp and lower thread presser plate so that
they do not snap the lower thread.
*
Lower thread
Lower thread clamp
opening timing
Adjust so that the lower thread clamp plate opens
when the feed mechanism moves 6 - 7 mm.
70*
Sewing start speed
Slow start
Use parameter numbers 10 to 13 to set the number of
stitches and the speed for slow starting.
36
Bar tack thread
tension
Bar tack thread tension is
too strong.
Make the bar tack tension as weak as possible.
27
4008Q
Tack tension
0.5 - 1 mm
Zigzag tension
4000Q
Screw
Increase
Decrease
4003Q