Brother International HE-800B Instruction Manual - English - Page 91

Uneven seams (4) …… Uneven sewing pitch at the sewing start

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11. TROUBLESHOOTING 11-6. 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 Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Lower thread clamp Lower thread clamp Advance the timing at which the lower thread clamp opening timing starts to open. Page 70* 11-7. Uneven seams (5)......Poor rounding of seam Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Thread tension Zigzag thread upper thread Adjust the upper thread tension appropriately. tension Zigzag tension opening disc ・Check the opening of the zigzag tension discs. ・Replace the tension release solenoid. Lower thread tension Adjust the lower thread tension appropriately. Threading Upper thread threading Thread the upper thread correctly. Lower thread threading Thread the lower thread correctly. Stitch patterns Purl stitch, whip stitch Set using parameter number 53. Tension release Tension release timing Use parameter numbers 54 to 57 to set the timing for changing the thread tension. Page 26, 27 * 26 22 25 40 40 11-8. Uneven seams (6) ...... Around rear tack or front tack Items with a "*" in the "Page" column should only be handled by a qualified technician. Cause Check Remedy Tension release Tension release timing Use parameter numbers 54 to 57 to set the timing for changing the thread tension. Threading Upper thread threading Thread the upper thread correctly. Lower thread threading Thread the lower thread correctly. Zigzag thread tension Zigzag tension opening disc ・Adjust the tension disc opening amount. ・Check the opening of the zigzag tension discs. ・Replace the tension release solenoid. Upper thread trimmer Upper thread trimmer Apply grease to the inclined face of the opening cam. operation Page 40 22 25 * 69* 11-9. Uneven seams (7) ...... Loose thread end at end backtack Cause Backtack shape Check Checking the number of end backtack stitches Checking the end backtack width Remedy Adjust the setting values for parameter numbers 51 and 52. Page 39 HE-800B 82

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HE-800B
11. TROUBLESHOOTING
82
11-6. 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
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Lower thread clamp
Lower
thread
clamp
opening timing
Advance the timing at which the lower thread clamp
starts to open.
70*
11-7. Uneven seams (5)……Poor rounding of seam
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Zigzag thread upper thread
tension
Adjust the upper thread tension appropriately.
26, 27
Zigzag
tension
disc
opening
・
Check the opening of the zigzag tension discs.
・
Replace the tension release solenoid.
*
Thread tension
Lower thread tension
Adjust the lower thread tension appropriately.
26
Upper thread threading
Thread the upper thread correctly.
22
Threading
Lower thread threading
Thread the lower thread correctly.
25
Stitch patterns
Purl stitch, whip stitch
Set using parameter number 53.
40
Tension release
Tension release timing
Use parameter numbers 54 to 57 to set the timing for
changing the thread tension.
40
11-8. Uneven seams (6) …… Around rear tack or front tack
Items with a “*” in the “Page” column should only be handled by a qualified technician.
Cause
Check
Remedy
Page
Tension release
Tension release timing
Use parameter numbers 54 to 57 to set the timing for
changing the thread tension.
40
Upper thread threading
Thread the upper thread correctly.
22
Threading
Lower thread threading
Thread the lower thread correctly.
25
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.
*
Upper thread trimmer
Upper
thread
trimmer
operation
Apply grease to the inclined face of the opening cam.
69*
11-9. Uneven seams (7) …… Loose thread end at end backtack
Cause
Check
Remedy
Page
Backtack shape
Checking the number of
end backtack stitches
Checking the end backtack
width
Adjust the setting values for parameter numbers 51
and 52.
39