Brother NQ3500D Operation Manual page 196

Troubleshooting
Symptom
The sewing light is damaged.
The sewing light
does not come on.
"Light" is set to "OFF" in the settings screen.
Embroidery unit is not attached correctly.
Embroidery unit
does not operate.
Embroidery frame was attached before the unit
was initialized.
■ While sewing
Symptom
"Start/Stop" button was not pressed.
Machine does not
operate.
The bobbin winder shaft is pushed to the right.
There is no pattern selected.
Presser foot is not lowered.
"Start/Stop" button was pressed with the foot
controller attached.
The "Start/Stop" button was pressed while the
machine is set for the sewing speed controller
to control the zigzag stitch width.
Needle is installed incorrectly.
Needle breaks.
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 tight.
Fabric is pulled during sewing.
Spool cap is set incorrectly.
There are scratches around the opening in the
needle plate.
There are scratches around the opening in the
presser foot.
There are scratches on the bobbin case.
Needle is defective.
A bobbin designed specifically for this machine
is not used.
Upper threading is incorrect.
Bobbin is set incorrectly.
Presser foot is attached incorrectly.
Screw of the presser foot holder is loose.
Fabric is too thick.
A-14
Probable Cause
Probable Cause
Remedy
Contact your authorized Brother dealer or the
nearest Brother authorized service center.
Change the setting to "ON".
Reattach the embroidery unit correctly.
Remove the embroidery frame, and then
perform the initialization process correctly.
Remedy
Press the "Start/Stop" button.
Move the bobbin winder shaft to the left.
Select a pattern.
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, or set the
"Width Control" to "OFF" in the settings screen.
Reinstall the needle correctly.
Tighten the needle clamp screw.
Replace the needle.
Check the "Fabric/thread/needle combinations"
chart.
Use the recommended presser foot.
Adjust the thread tension.
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 Brother dealer.
Replace the presser foot, or consult your
authorized Brother dealer.
Replace the bobbin case, or consult your
authorized Brother dealer.
Replace the needle.
Incorrect bobbins will not work properly. Only
use a bobbin designed specifically for this
machine.
Check the steps for threading the machine and
rethread the machine.
Reset the bobbin correctly.
Attach the presser foot correctly.
Securely tighten the screw of the presser foot.
Use fabric that the needle can pierce when the
handwheel is turned.
Reference
–
B-15
B-54
B-55
Reference
B-35
B-18
B-35
B-2
B-37
B-13
B-31
B-31
B-31
B-30
B-34
B-41
–
B-18
A-2
B-33
A-2
B-31
B-18
B-24
B-21
B-33
B-34
B-30, S-4