Owner's Manual

60
Chapter 13 TROUBLESHOOTING
BAS-364E, 366E, 370E, 375E
Check and remedy
● Is the needle touching the rotary hook?
/
Adjust while referring to "Needle
and rotary hook timing" and "Adjusting the needle clearance".
● Is the needle bent or the needle tip broken?
/
Replace the needle.
● Is the needle installed incorrectly?
/
Install the needle correctly, while re-
ferring to "Installing the needle".
● Is needle deflection occurring?
/
Select a needle which matches the ma-
terial being sewn, or reduce the sewing speed.
● Is the needle too thin?
/
Select a needle which matches the material being
sewn.
●
Is the thread trimming timing correct? / Change the thread trimming tim-
ing.
●
Is the fixed knife blunt? / Sharpen the fixed knife or replace it with a new
knife.
●
Is the movable knife picking up the needle thread? / Adjust while referring
to " Needle and rotary hook timing ".
●
Is the tension of the sub-tension correct? / Turn the nut to adjust to a
suitable tension.
●
Is the needle and rotary hook timing correct? / Adjust while referring to
"Needle and rotary hook timing".
●
Are the threads being separated correctly at the rotary hook holder posi-
tion? / Adjust while referring to "Adjusting the inner rotary hook bobbin
case holder position".
●
Are the thread lengths correct? / Use the sub-tension to adjust the thread
lengths while referring to "Thread tension".
● Is the needle thread tension too weak?
/
Adjust the needle thread tension
while referring to "Thread tension".
● Is the bobbin thread tension too weak?
/
Adjust the bobbin thread tension
while referring to "Thread tension".
● Is the tension of the sub-tension correct?
/
Adjust the sub-tension while
referring to "Thread tension".
● Is the fixed knife correct?
/
Sharpen the fixed knife or replace it with a new knife.
Problem
Needle breaks.
Needle thread is not trimmed.
Thread is tangling.
Poor seam finish on underside of
material.
Poor thread tightening.
Needle thread lengths are uneven.