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HE-800A
16. TROUBLESHOOTING
96
ውዒ
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. Uneven seams (3) ……Seam lifts up at the sewing start
Seam lifts up and does not tighten at the sewing start
Cause Check Remedy Page
Upper thread scissors
gradual opening timing
Adjust the timing so that the upper thread scissors
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
76
Upper thread
scissors
Upper thread scissors
operation
Apply grease to the inclined face of the opening
cam.
76
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
scissors assembly at the sewing start.
-
ውዒ
-
ዒ
. Uneven seams (4) …… Uneven sewing pitch at the sewing start
Bird’s nests form at the sewing start, and after 5 – 6 mm the sewing pitch suddenly increases
Cause Check Remedy Page
Lower thread clamp Lower thread clamp
opening timing
Advance the timing at which the lower thread clamp
starts to open.
77
ውዒ
-
ዓ
. Uneven seams (5)……Poor rounding of seam
Cause Check Remedy Page
Zigzag thread upper
thread tension
Adjust the upper thread tension appropriately.
62
Zigzag tension disc
opening
Check the opening of the zigzag tension discs.
Replace the tension release solenoid.
62
Thread tension
Lower thread tension Adjust the lower thread tension appropriately. 61
Upper thread threading Thread the upper thread correctly. 58 Threading
Lower thread threading Thread the lower thread correctly.
60
Stitch patterns Purl stitch, whip stitch Set using parameter number 11. 37
Tension release Tension release timing Use parameter numbers 63 to 66 to change the
tension release on and off timing.
44
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-
ዔ
. Uneven seams (6) …… Around rear tack or front tack
Cause Check Remedy Page
Tension release Tension release timing Use parameter numbers 63 to 66 to change the
tension release on and off timing.
44
Upper thread threading Thread the upper thread correctly. 58 Threading
Lower thread threading Thread the lower thread correctly. 60
Zigzag thread
tension
Zigzag tension disc
opening
Adjust the tension disc opening amount.
Check the opening of the zigzag tension discs.
Replace the tension release solenoid.
62
Upper thread
scissors
Upper thread scissors
operation
Apply grease to the inclined face of the opening
cam.
76
4000Q
Screw
Increase
Decrease