Brother 884-T20 Operation Manual page 220

Symptom
Probable Cause/Remedy
The needle breaks.
The needle hits/touches the needle plate.
1 Needle
2 Hole in needle plate
3 Needle hits hole
• Replace the needle.
The presser foot is set too high and not correctly
positioned.
The needle hits/touches the presser foot.
The area around the embroidery foot hole is
damaged.
1 Scratches or Burrs
• Replace the presser foot.
Sliding surface on hook race is not smooth.
There are scratches or burrs on it.
1 Hook race area
The bobbin or bobbin case are not correctly
installed.
• Remove and reinstall bobbin and bobbin
case.
The hook is not correctly installed.
The hook stopper is not correctly installed, the
hook is making a complete rotation.
218
Symptom
Page Probable Cause/Remedy
The needle breaks.
The upper thread is not threaded correctly.
The upper thread is catching somewhere.
• Pull the upper thread by hand from below the
presser foot, and check that the thread moves
smoothly. If the thread does not move, it is
not threaded correctly. Thread the upper
thread correctly. Make sure the thread is
p.79
caught by the needle bar thread guide.
*
The upper thread tension is set too high. It does
not run.
• Decrease the upper thread tension and make
sure tension disc rotates when pulling on
thread.
A bobbin designed specifically for this machine
is not used.
• Use the correct bobbin.
The needle and the hook are not correctly
*
passing each other.
• Hook timing may be OFF.
There is backlash play (forward/backward) in
the needle bar case.
The thread density of the embroidery data is too
fine.
Three or more overlapping stitches are being
sewn.
*
• Using a data design system, correct the
thread density and overstitching settings in
the embroidery data.
The thread is not cut automatically.
Lint or dust has accumulated around the needle
plate (moving knife, fixed knife or thread
retaining plate).
• Remove any lint or dust around the needle
plate.
A bobbin case designed specifically for this
machine is not used.
• Use the correct bobbin case.
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.
After the threads are automatically cut, the upper thread is
too short and comes out of the needle.
Lint or dust has accumulated around the needle
p.33
plate (moving knife, fixed knife or thread
p.34
retaining plate).
• Remove any lint or dust around the needle
*
plate.
*
Page
p.50
p.103
p.30
*
*
p.123
p.211
–
p.213
p.211