Brother BE-438C, Instruction Manual

Page: 64 / 67

16. TROUBLESHOOTING
58
BE-438C
Problem Cause Check Remedy Page
Lower thread tension is
too strong.
Lower thread tension
Adjust the lower thread
tension.
25
Lower thread breaks.
Corners of needle hole
plate or bobbin care are
damaged.
Damage
File smooth or replace
the affected part.
Clearance between
needle and rotary hook
tip is too great.
Needle clearance
Adjust the needle clear-
ance.
34
Incorrect needle and
rotary hook timing.
Needle bar lift amount
Adjust the needle bar lift
amount.
33
Driver is contacting
needle more than is
necessary.
Clearance between driver
and needle Adjust the driver needle
guard.
34
Needle is bent. Bent needle Replace the needle.
Skipped stitches occur.
Needle is installed incor-
rectly.
Needle direction
Install the needle cor-
rectly.
22
Needle is striking the
button
Needle down setting
Refer to “6. CHECKING
THE SEWING
PATTERN”.
21
Needle clearance
Adjust the needle clear-
ance.
34
Needle is touching the
rotary hook.
Needle bar lift amount.
Adjust the needle bar lift
amount.
33
Needle is bent. Bent needle Replace the needle.
Needle breaks.
Needle is too thin. Needle and thread
Use the correct needle
for the material.
Movable knife is blunt. Movable knife blade
Replace the movable
knife.
37
Fixed knife is blunt. Fixed knife blade
Sharpen or replace the
fixed knife.
37
Shuttle race thread guide
position Adjust the position of the
shuttle race thread guide.
34
Movable knife does not
pick up the thread.
Needle bar lift amount
Adjust the needle bar lift
amount.
33
The movable knife does
not pick up the thread
because of skipped
stitches at the sewing
end.
Skipped stitches at sewi-
ng end Refer to “Skipped stitches
occur”.
58
Movable knife position is
incorrect.
Movable knife position
Adjust the position of the
movable knife.
36
Upper thread is not
trimmed.
Sub-tension is too weak. Sub-tension
Turn the sub-tension nut
to adjust the tension.
25