Uneven Seams; At The Sewing Start; Lower Thread Is Lifted Up At The Sewing Start - Brother HE-800B Instruction Manual

Instruction manual - english
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11-3. Uneven seams (1) ...... At the sewing start
Items with a "*" in the "Page" column should only be handled by a qualified technician.
Cause
Upper thread trimmer
Upper thread feeding
Lower thread (bobbin
slip)
Check
Installation height
Upper
thread
trimmer
opening timing
Upper
thread
trimmer
operation
Thread take-up amount
Lower thread tension
Bobbin holder spring
Lower
thread
retainer
position
Bobbin presser position
Bobbin insertion
Remedy
Adjust the upper thread trimmer installation height.
Adjust to an appropriate opening timing.
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 trimmer
assembly at the sewing start.
Decrease
Adjust the lower thread tension appropriately.
Add tension to the bobbin holder spring.
.
Add tension to the spring by the same
amount that the bobbin tab is projecting.
Make a gap
Adjust the lower thread retainer position.
* Adjust lower thread retainer so that a 35 - 40 mm
thread leader is left after trimming.
Adjust the bobbin presser position.
Insert the bobbin correctly.
HE-800B
11. TROUBLESHOOTING
Screw
Increase
4000Q
4001Q
35 - 40mm
4002Q
Page
68*
69*
69*
*
26
*
*
70*
25
80

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