5. TROUBLESHOOTING
116
Cause Check Remedy Page
Needle plate position Adjust the forward/back position of the needle plate
so that the needle is in the center of the needle hole.
-
Needle plate
Burr on the screw hole
edge (in event of uneven
material feeding)
Polish with buff.
-
Upper thread trimmer
assembly
Needle strikes upper
thread trimmer
Refer to “5-16. Needle strikes upper thread trimmer”.
114, 115
Cutter
Clearance between
needle bar and cutter
Install the cutter so that the clearance between the
needle bar and the cutter is 0.3 mm.
* The cutter release section of the needle bar should
be at a right angle to the cutter.
83
5-18. Imperfect cutter function (imperfect material cutting)
Cause Check Remedy Page
Installation position of
cutter
Install the cutter so that its edge is aligned with the
top of the needle plate.
88
Cutter blade
⋅ If blade is worn or chipped, sharpen it or replace it.
⋅ Replace with the special needle plate (optional).
Instruction
manual
Cutter
Damage to cutter
mechanism parts
Loose screws
⋅ Replace any parts that are damaged.
⋅ Tighten any loose screws.
-
Cutter solenoid Check for a disconnected
cord.
Connect the cords.
-
Cutter power Memory switches If the material is heavy and difficult to cut, use
memory switch No. 00 to increase the cutting force
of the cutter.
Instruction
manual
4015Q
Bisect
4014Q
4016Q
0.3 mm
(Needle plate cross section)
Check the chamfered side
finishing
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