Needle Breaks; Noise; Forward And Reverse Feedings Differ; Improper Length Of Buttonhole Legs - Brother STAR240E Service Manual

PROBLEM CAUSE
8. Needle breaks. 1. Touch pattern dial while needle is in the fabric.
2. Needle hits inner rotary hook.
3. Needle hits needle plate.
4. Bent or blunt needle.
5. Improper clearance between the needle and the
6. Machine feeds while needle is in the fabric.
7. Needle flows.
8. Fabric is pulled excessively.

9. Noise.

1. Play of worm/pattern cam gear.
2. Play of lower shaft.
3. Play of upper shaft.
4. Noise from rotary hook.
10.Forward and 1. Improper adjustment of reverse sewing lever.
reverse
feedings differ.
11.Improper length 1. Improper adjustment.
of buttonhole
legs.
12.Improper 1. Improper adjustment of buttonhole length.
buttonhole size
against button
size.
13.Unbalanced 1. Stitch length dial is not set at ''SS''.
patterns. 2. Feed dog is worn out.
3. Improper height of feed dog.
4. Improper attachment of feed dog.

5. Forward and reverse feedings differ.

6. Stitch width dial is not set to "5".
14.Needle hits 1. Release volume is too big.
needle plate
when pattern
selector dial is
turned.
15.Fabric gathers. 1. Thread tension is too tight.
2. Blunt needle.
3. Improper combination of needle/ thread/fabric.
4. Improper threading.
rotary hook.
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CORRECTION
1. Operate machine correctly.
2. Adjust the position of inner
rotary hook stopper.
* Refer to P.41.
3. Make sure the correct needle
is used.
* Refer to P.33, P.35.
4. Change needle.
5. Refer to P.38.
6. Refer to P.33.
7. Refer to P.36.
8. Guide the fabric.
1. Adjust to proper gearing.
2. Adjust play of the lower shaft.
3. Adjust play of the upper shaft.
4. Clean the race of inner rotary
hook and outer rotary hook or
replace inner rotary hook.
1. Refer to P.57.
1. Adjust screw.
* Refer to P.54.
1. Adjust the length of
buttonhole.
* Refer to P.55.
1. Operate machine correctly.
2. Change the feed dog.
* Refer to P.42, P.43.
3. Refer to P.43.
4. Attach the feed dog correctly.
5. Refer to P.50.
6. Operate machine correctly.
1. Adjust the release volume.
* Refer to P.37.
1. Reduce the tension.
2. Change the needle.
3. Select correct combination of
needle/ thread/fabric.
4. Reset threading correctly.