Brother CB3-B917 Service Manual page 51

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