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Possible Causes Solution
Needle installation is incorrect Install needle correctly (see operator manual)
Needle strikes the rotary hook Adjust hook timing
Poor needle quality Replace needle
Dull needle tip Replace needle
Needle too small for fabric Replace with compatible needle
When sewing caps, using at needle plate instead
of raised needle plate
Install raised needle plate
Needle strikes the needle plate Check needle case calibration
Skipped Stitches
Problem Possible Causes Solutions
Needles Needle is bent or damaged Replace needle.
Incorrect needle for the thread
size being used
Replace with a compatible needle
Needle is installed incorrectly Install needle correctly (see oper-
ator manual)
Needle Depth Needle bar lowest dead point is
incorrect
Adjust needle depth
Rotary Hook Hook timing is incorrect Adjust hook timing
Hook point is dull Replace hook
Upper/Bobbin Tension Bobbin thread does not feed out
smoothly
Replace the bobbin and/or bob-
bin case
Upper thread does not feed out
smoothly
Check the condition of the
thread feeder roller. If it is bad,
replace it. Adjust the thread feed
parameters in the Melco OS
software. If that does not solve
the problem, replace the optical
sensor switch assembly.
Presser Foot A week or broken presser foot
prevents the needle from coming
out of the fabric smoothly
Replace the presser foot spring
Thread Thread twist is too tight Use the appropriate thread or
consult Technical Support for
suggestions
Thread is too elastic to form an
adequate loop
Use the appropriate thread or
consult Technical Support for
suggestions
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