Trouble With Threads And Stitches - Brother PC-850D Operation Manual

Trouble with threads and stitches

Before calling for service, check the following items. If the problem still persists, contact the place of
purchase or your nearest Brother dealer.
Symptom
1. Upper thread breaks
2. Bobbin thread breaks
3. Skipped stitches
4. Fabric puckers
5. Inability to thread needle
6. Inability for thread tension control
Probable cause
1. Upper threading is not correct.
2. Upper thread is tangled.
3. Spool of thread is not correctly set.
4. Correct needle is not used.
5. Shuttle is damaged.
1. Upper thread is tangled.
2. Bobbin is not threaded properly in the
shuttle.
1. Needle is not correctly inserted.
2. Correct needle is not used.
3. The combination of fabric, thread and
needle is not correct.
4. Dust is clinging under the needle plate.
5. Upper threading is not correct.
1. Threading is not correct
2. Correct needle is not used.
3. Combination of fabric, thread and
needle is not correct.
4. Check if thread tension is set at
"AUTO" position,
1. Needle position is not collect.
2. Hook of needle threader does not fit
into the eye of the needle.
1. Upper threading is not correct.
2. Set of bobbin thread is not correct.
3. Combination of fabric, thread and
needle is not correct.
4. Check if the thread tension is set at
"AUTO" position.
Remedy
1. Re-thread upper thread.
2. Remove thread ends in the race or
shuttle.
3. Set spool of thread correctly.
4. Change to proper needle.
5. Contact service center.
1. Remove thread ends in the race or
inner shuttle or from around spool pin.
2. Set bobbin properly and pull out the
bobbin thread.
1. Insert needle properly.
2. Change to proper needle.
3. Check the "RELATED CHART OF
SEWING FABRICS, THREAD AND
NEEDLE" on page 172.
4. Remove dust by cleaning with a brush.
5. Re-thread upper thread.
1. Re-thread upper and bobbin thread
correctly.
2. Change to proper needle.
3. Check "RELATED CHART OF
SEWING FABRICS, THREAD AND
NEEDLE" on page 172.
4. Refer to "THREAD TENSION" on page
29.
1. Set needle at proper position using
"NEEDLE POSITION" button.
2. Set needle at proper position using
"NEEDLE POSITION" button.
1. Re-thread upper thread.
2. Set bobbin properly and pull out the
bobbin thread.
3. Check "RELATED CHART OF
SEWING FABRICS, THREAD AND
NEEDLE" on page 172.
4. Refer to "THREAD TENSION" on page
29.
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