Brother 884-T20 Operation Manual page 223

Symptom
Probable Cause/Remedy
The embroidery pattern is misaligned.
The carriage moved while removing
embroidery frame.
• The pattern may become misaligned if the
presser foot was hit or the carriage was
moved while replacing bobbin thread,
changing needle, or working near
embroidery frame.
Be careful when removing and reattaching
the embroidery frame while replacing bobbin
thread, changing needle, or working near
embroidery frame.
If the carriage is moved, turn the machine off,
then on again. The correct frame position at
the time that the machine was stopped is
stored in the machine's memory, and the
embroidery frame is returned to the correct
position.
The design was not digitized correctly.
• The design may need more pull
compensation or underlay to accommodate
stretchy or high-napped fabrics.
The size of the installed embroidery frame is not correctly
detected.
The thumbscrews on the embroidery frame
holder are loose.
• Use the included disc-shaped screwdriver to
firmly tighten the thumbscrews.
The starting position for the embroidery frame is
horizontally misaligned.
The thumbscrews on the embroidery frame
holder are loose.
• Use the included disc-shaped screwdriver to
firmly tighten the thumbscrews.
There are loops in the upper thread.
The upper thread tension is low.
• After passing the upper thread through the
hole in the presser foot, pull the thread by
hand to check the thread tension. If it is
difficult to determine, compare it with other
needle bars where looping does not occur.
Symptom
Page Probable Cause/Remedy
There are loops in the upper thread.
The thread tension does not correspond to the
amount that the thread tension knob was
tightened.
• If the thread tension cannot be adjusted,
thread wax and dust may have collected in
the upper or middle thread guide plates,
causing the thread tension guide plates to
rise. Clean the thread tension guide plates.
–
Thread is not correctly threaded around upper
thread tension discs.
• Clean upper thread tension disc. Rethread
and make sure tension disc rotates when
pulling on thread.
The thread quality is poor.
• Try sewing with different thread. If the
problem no longer occurs after the thread is
changed, the thread quality is the problem.
Replace the thread with one of good quality.
The machine is noisy.
–
Lint may be wound in the hook.
• Clean the hook.
The upper thread is not threaded correctly.
• Check the thread path, and then thread the
upper thread again.
The hook is damaged.
p.28
• Replace the hook.
Not enough oil was applied.
• Oil recommended parts.
The needle threader cannot be used.
The needle is not at the correct position.
• Touch the key to move the desired needle bar
p.28
to be threaded into embroidering position.
Recommended needles are not used on this
machine.
• Replace and use recommended needle.
The needle is not installed correctly.
• Correctly install the needle.
The hook on the automatic needle-threading
mechanism is bent.
The thread tension is incorrect.
The upper thread is not threaded correctly.
• Check the thread path, and then thread the
–
upper thread again.
The bobbin thread is not correctly threaded.
• Correctly thread the bobbin thread.
The lower thread tension is incorrect.
• Adjust the tension of the bobbin thread.
Lint or dust has accumulated in the thread
tension disc.
• Remove the tension dials, and then remove
any lint or dust accumulated between the felt
washers.
APPENDIX
Page
p.213
p.213
–
p.210
p.50
*
p.214
p.56
p.30
p.79
7
p.30
p.79
*
p.50
p.33
p.102
p.213
221