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Brother NC21SE Operation Manual Page 254

Computerized sewing and embroidery machine.
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TROUBLESHOOTING
Problem
Needle breaks
Fabric does not feed
through the machine
Machine does not
operate
Embroidery unit does
not operate
LCD display is difficult
to see
Nothing happens,
even if the LCD
display is pressed
• This machine is equipped with a thread detection device. If the "Start/Stop" button is pushed before the
upper threading is done, the machine will not operate properly. Also, depending on the pattern selected,
the machine may feed the fabric even if the needle is raised. This is due to the needle bar release
mechanism. At these times, the machine will make a sound different from that made during normal
sewing. This is not the sign of a malfunction.
• If the power is disconnected during sewing:
Turn the main power to OFF and unplug the machine.
If you restart the machine, follow the instructions for operating the machine correctly.
242
Cause
Needle is installed incorrectly.
Needle clamp screw is not tightened.
Needle is turned or bent.
Using improper needle or thread for the
selected fabric.
Wrong presser foot was used.
Upper thread tension is too strong.
Fabric is pulled during sewing.
Spool cap is set incorrectly.
There are scratches around the holes in the
needle plate.
There are scratches around the hole(s) in the
presser foot.
There are scratches on the race.
Needle is defective.
Feed dogs are set in the down position.
Stitches are too close together.
Wrong presser foot was used.
Needle is turned, bent or the point is dull.
Thread is entangled.
There is no pattern selected.
"Start/Stop" button was not pushed.
Main power switch is not turned on.
Presser foot is not lowered.
"Start/Stop" button was pushed with the foot
controller attached.
Speed control lever is set to control the zigzag
stitch width.
All keys and buttons have been locked by
.
There is no pattern selected.
Main power switch is not turned on.
Embroidery unit is not attached correctly.
Embroidery frame was attached before the unit
was initialized.
LCD contrast is not properly adjusted.
The screen has been locked.
Solution
Reinstall the needle correctly.
Tighten the needle clamp screw.
Replace the needle.
Check the "Fabric/Thread/Needle
Combination" chart.
Use the recommended presser foot.
Adjust the thread tension setting.
Do not pull the fabric during sewing.
Check the method for attaching the spool cap,
then reattach the spool cap.
Replace the needle plate, or consult your
authorized dealer.
Replace the presser foot, or consult your
authorized dealer.
Replace the race, or consult your authorized
dealer.
Replace the needle.
Use the feed dog position lever to raise the
feed dogs.
Lengthen the stitch length setting.
Use the correct presser foot.
Replace the needle.
Cut the entangled thread and remove it from
the race.
Select a pattern.
Press the "Start/Stop" button.
Turn the main power to ON.
Lower the presser foot.
Remove the foot controller, or use the foot
controller to operate the machine.
Use the foot controller instead of the "Start/
Stop" button to operate the machine.
Press
to unlock all keys and
buttons.
Select a pattern.
Turn the main power to ON.
Reattach the embroidery unit correctly.
Perform the initialization process correctly.
Adjust the LCD contrast.
Press either of the following keys to unlock the
screen.
CAUTION
Page
39
40
39
41
"STITCH SETTING
CHART"
50, 174
29
65
37
236
39
85
49
"STITCH SETTING
CHART"
39
59, 116, 149, 199
3
10
3
45
45
37, 39
149, 199
10
146
146
19, 238

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