Brother International CB3-B917 Service Manual - Page 54

heavy thread.

Get Brother International CB3-B917 PDF manuals and user guides View all Brother International CB3-B917 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 54 highlights

Problem 15. Thread parts at stitch link Cause Thread splits on material top. 639s • Thread winds onto looper in machine stop position. • Occurs frequently when using heavy thread. Material 608s Solution (1) Increase the sub tension. 6. TROUBLESHOOTING Page (2) Use a finer thread. 606s (3) Decrease the number of stitch. (4) Shift the needle location to the outside of the button hole. 16. Thread remains Insufficient sub tension on material top at first stitch. (1) Increase sub tension. 640s 641s • Normal number of stitches 606s (2) Decrease rotor thread take-up. 41 619s A looper is formed Stitches formed improperly at sewing Increase the clamp pressure so that the button 41 at the second start (material not fed properly). clamp holds the material firmly. stitch between the material and the button, or the thread from the first stitch Rise the nut interrupts the second stitch between the material and button. 10 - 15 mm 642s 523s 643s 64302s 64303s CB3-B916A/B917A 48

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
6. TROUBLESHOOTING
CB3-B916A/B917A
48
Problem
Cause
Solution
Page
(1)
Increase the sub tension.
(2)
Use a finer thread.
(3)
Decrease the number of stitch.
15. Thread parts
at stitch link
Thread splits on material top.
(4)
Shift the needle location to the outside of the
button hole.
(1)
Increase sub tension.
16. Thread remains
on material top
at first stitch.
Insufficient sub tension
(2)
Decrease rotor thread take-up.
41
Stitches formed improperly at sewing
start (material not fed properly).
Increase the clamp pressure so that the button
clamp holds the material firmly.
41
606s
•
Thread winds
onto looper in
machine stop
position.
•
Occurs
frequently
when
using
heavy thread.
639s
640s
606s
619s
641s
•
Normal number
of stitches
523s
Rise the nut
A looper is formed
at the second
stitch between the
material and the
button, or the
thread from the
first stitch
interrupts the
second stitch
between the
material and
button.
10 – 15 mm
642s
643s
608s
Material
64302s
64303s