JUKI LK-1900AN, Engineer'S Manual

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Trouble Cause (1) Cause (2) Check and corrective measures
From the previous page From the previous page
4-B) Friction is excessive between the
Y feed arm and the cloth feed
support plate.
Install the cloth feed support plate.
4-C) The feed plate or the work clamp
foot is caught by the needle hole
guide.
Tighten the set screw further for the needle
hole guide.
3-5) Inadequate adjustment of
the X sensor position
Adjust the X sensor position correctly.
3-6) Inadequate adjustment of
the Y slit plate
Adjust position of the Y slit plate correctly.
4. Sewing machine locked 4-1) Large needle compared
with the hole diameter of
the needle hole guide
Replace the needle hole guide.
5. Severe vibration 5-1) Inadequate crank balancer
positioning
Define the correct crank balancer position.
6. Malfunction of vertical movement
of work clamp foot
6-1) Looseness of thread trim-
mer cam screw
Define the thread trimmer cam position and
fix the cam.
6-2) Presser pulse motor mal-
function
2-A) Defective the presser pulse mo-
tor.
Replace the presser pulse motor.
2-B) The presser pulse motor is
wrongly connected.
Check the connector connections.
6-3) Defective circuit board 3-A) Circuit board programming flaw. Replace the circuit board.
3-B) Connector connections are
wrongly made.
Check the connector connections.