List Of Symptoms - Brother NQ3700D Operation Manual

List of symptoms

Check the following possible problems before requesting
service. If the reference page is "*", contact your authorized
Brother dealer or the nearest Brother authorized service
center.
Getting ready
Symptom, Cause/solution
Cannot thread the needle.
Needle is not in the correct position.
• Press the "Needle position" button to raise the
needle.
Needle is installed incorrectly.
Needle is turned, bent or the point is dull.
Upper threading is incorrect.
The needle threader lever is not lowered until it
clicks.
The needle threader hook is bent and does not
pass through the eye of the needle.
The needle threader lever cannot be moved or
returned to its original position.
A size 65/9 needle is being used.
• The needle is incompatible with the needle
threader. Manually pass the thread through the
eye of the needle.
Cannot lower the presser foot with the presser foot
lever.
Presser foot was raised using the "Presser foot
lifter" button.
Bobbin thread does not wind neatly on the bobbin.
The thread is not passed through the bobbin
winding thread guide correctly.
The thread that was pulled out from the bobbin
winding thread guide was incorrectly wound onto
the bobbin.
The empty bobbin was not set on the pin properly. 20
While winding the bobbin, the bobbin thread was
wound below the bobbin winder seat.
The thread was incorrectly passed under the
pretension disk on the bobbin winding thread
guide.
• Remove any entangled thread, and then wind
the bobbin.
The bobbin thread cannot be pulled up.
Needle is turned, bent or the point is dull.
Bobbin is set incorrectly.
Nothing appears in the LCD.
Main power switch is not turned on.
The plug of the power cord is not inserted into an
electrical outlet.
The LCD screen is fogged up.
Condensation has formed on the LCD screen.
• After a while, the cloudiness will disappear.
Symptom, Cause/solution
The operation keys do not respond, or the key
response is too sensitive.
A glove is worn when the keys are pressed.
The keys are pressed with a fingernail.
A non-electrostatic touch pen is being used.
The sensitivity of the operation keys is not set for
the user.
The sewing light does not come on.
Reference
[Light] is set to [OFF] in the settings screen.
Embroidery unit does not operate.
10
Embroidery unit is not attached correctly.
Embroidery frame was attached before the unit
28
was initialized.
28
Cannot retrieve an embroidery pattern via wireless
network.
24
Embroidery patterns unavailable for this machine
cannot be retrieved.
* • Check the embroidery data and the message
displayed on the application.
*
While sewing
25
Symptom, Cause/solution
Machine does not operate.
"Start/Stop" button was not pressed.
The bobbin winder shaft is pushed to the right.
10 There is no stitch selected.
Presser foot is not lowered.
"Start/Stop" button was pressed with the foot
20
controller attached.
The "Start/Stop" button was pressed while the
21
machine is set for the sewing speed controller to
control the zigzag stitch width.
Needle breaks.
Needle is installed incorrectly.
Needle clamp screw is not tightened.
Needle is turned or bent.
20, 108
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.
28
Spool of thread is set incorrectly.
22
There are scratches around the opening in the
needle plate.
12
* There is a notch on the left side of the opening
12
in the needle plate. This is not a scratch.
a
–
There are scratches around the opening in the
presser foot.
There are scratches on the bobbin case.
Troubleshooting
Reference
13, 17
16
80
80
–
Reference
31
20
31
32
32
15, 66
28
28
28
27
29
38
–
20
*
1 Notch
*
*
109
5