Brother International HE-800A Instruction Manual - English - Page 104

Seam lifts up and does not tighten at the sewing start, Bird's nests form at the sewing start,

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16. TROUBLESHOOTING １６-５. Uneven seams (3) ......Seam lifts up at the sewing start Seam lifts up and does not tighten at the sewing start Cause Upper scissors thread Upper thread feeding Check Upper thread scissors gradual opening timing Upper thread scissors operation Thread take-up amount Remedy Adjust the timing so that the upper thread scissors gradually start opening when the feed mechanism moves about 1.5 - 2.5 mm. Apply grease to the inclined face of the opening cam. Loosen the screw to decrease thread take-up amount so that upper thread does not pull out of scissors assembly at the sewing start. Page 76 76 Screw Increase Decrease - 4000Q １６-６. 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 Lower thread clamp Check Lower thread opening timing Remedy clamp Advance the timing at which the lower thread clamp starts to open. Page 77 １６-７. Uneven seams (5)......Poor rounding of seam Cause Thread tension Threading Stitch patterns Tension release Check Zigzag thread thread tension Zigzag tension opening upper disc Lower thread tension Upper thread threading Lower thread threading Purl stitch, whip stitch Tension release timing Remedy Adjust the upper thread tension appropriately. ࡮Check the opening of the zigzag tension discs. ࡮Replace the tension release solenoid. Adjust the lower thread tension appropriately. Thread the upper thread correctly. Thread the lower thread correctly. Set using parameter number 11. Use parameter numbers 63 to 66 to change the tension release on and off timing. Page 62 62 61 58 60 37 44 １６-８. Uneven seams (6) ...... Around rear tack or front tack Cause Tension release Threading Zigzag tension thread Upper scissors thread Check Tension release timing Upper thread threading Lower thread threading Zigzag tension disc opening Upper thread scissors operation Remedy Use parameter numbers 63 to 66 to change the tension release on and off timing. Thread the upper thread correctly. Thread the lower thread correctly. ࡮Adjust the tension disc opening amount. ࡮Check the opening of the zigzag tension discs. ࡮Replace the tension release solenoid. Apply grease to the inclined face of the opening cam. Page 44 58 60 62 76 HE-800A 96

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HE-800A
16. TROUBLESHOOTING
96
１６
-
５
. 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.
-
１６
-
６
. 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
１６
-
７
. 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
１６
-
８
. 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