Brother International CB3-B917 Service Manual - Page 51

Thread tension opens too early.

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6. TROUBLESHOOTING Problem 7.Thread remains in loop on odd stitches Cause Needle catches the stitch behind the material, preventing thread tightening. Solution (1) Move the loop spreader away from the needle. Page 19 35 (4-hole) (2-hole) • A frays appears in the loop. • Occurs with thread breakage. 603s 0.3 - 0.5 mm (2) Replace the loop spreader. 61401s 61402s 607s 8.Thread end not Rotor takes up too much thread. Decrease the thread take-up amount. 41 properly wound on the first stitch. (4-hole) (2-hole) 61701s 61702s 61801s 61802s 619s 9.Stitch joint varies Insufficient thread take-up by take-up Looper the thread take-up lever to increase thread 40 lever take-up. (4-hole) (2-hole) Occurs when needle pierces material on final stitch. Low thread tension 610s Increase the thread tension. 615s Thread tension opens too early. Adjust slider position. 37 62001s 62002s 10. Insufficient thread tightening Thread stuck in thread path. Check thread threading. (4-hole) (2-hole) 62201s 62202s Occurs frequently near sub tension. 626s 45 CB3-B916A/B917A

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6. TROUBLESHOOTING
CB3-B916A/B917A
45
Problem
Cause
Solution
Page
(1)
Move the loop spreader away from the needle.
19
35
7.Thread remains
in loop on odd
stitches
Needle catches the stitch behind the
material, preventing thread tightening.
(2)
Replace the loop spreader.
8.Thread end not
properly wound
on
the
first
stitch.
Rotor takes up too much thread.
Decrease the thread take-up amount.
41
Insufficient thread take-up by take-up
lever
Looper the thread take-up lever to increase thread
take-up.
40
Low thread tension
Increase the thread tension.
9.Stitch joint varies
Thread tension opens too early.
Adjust slider position.
37
10. Insufficient
thread
tightening
Thread stuck in thread path.
Check thread threading.
•
A frays appears
in the loop.
•
Occurs with
thread
breakage.
(4-hole)
(2-hole)
607s
0.3 – 0.5 mm
603s
(4-hole)
(2-hole)
61701s
61702s
61801s
61802s
61401s
61402s
619s
(4-hole)
(2-hole)
62001s
62002s
Occurs
when
needle pierces
material on final
stitch.
610s
615s
(4-hole)
(2-hole)
62201s
62202s
626s
Occurs frequently near
sub tension.