Brother PC-420 Operation Manual page 146

APPENDIX —————————————————————————————————————————————————————
Symptom
The feed dogs are lowered.
The stitch is too fine.
The presser foot that is used is not
appropriate for the type of stitch that
you wish to sew.
The fabric does
not feed.
The pressure of the presser foot is
weak.
The thread is tangled, for example,
in the shuttle.
The sewing lamp
does not come on. The sewing lamp is damaged.
Nothing appears The brightness of the LCD is either
in the LCD. too light or too dark.
140
Probable Cause Remedy
Slide the drop feed lever to the left.
Lengthen the stitch length.
Attach the presser foot that is appro-
priate for the type of stitch that you
wish to sew.
Turn the presser foot pressure dial to
the right to increase the pressure of
the presser foot.
Remove the tangle thread. If the
thread is tangled in the shuttle, clean
the shuttle.
Contact your retailer or the nearest
authorized service center.
Adjust the brightness of the LCD.
Reference
page 97
page 56
page 128
page 39
page 135
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page 142