Brother PR-620 Operation Manual page 217

APPENDIX —————————————————————————————————————————————————————
Symptom
The area around the embroidery
foot hole is damaged.
Sliding surface on hook race is
not smooth. There are scratches
or burrs on it.
The hook is not correctly
installed.
The hook stopper is not
The needle
correctly installed, the hook is
breaks.
making a complete rotation.
The upper thread is not threaded
correctly.
The upper thread is catching
somewhere.
The upper thread tension is set
too high. It does not run.
A bobbin designed specifically
for this machine is not used.
The needle and the hook are not
correctly passing each other.
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.
200
Probable Cause
1
1 Scratches or Burrs
1
1 Hook race area
Remedy
Replace the presser foot.
Consult your nearest authorized
dealer.
Consult your nearest authorized
dealer.
Consult your nearest authorized
dealer.
Consult your nearest authorized
dealer.
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 caught by the needle
bar thread guide.
Decrease the upper thread
tension and make sure tension
disc rotate when pulling on
thread.
Use the correct bobbin.
Hook timing may be OFF.
Consult your nearest authorized
dealer.
Consult your nearest authorized
dealer.
Using a data design system,
correct the thread density and
overstitching settings in the
embroidery data.
Reference Page
p.35-38
p.86
p.15
p.100