JUKI LK-1900B series Engineer's Manual

– 129 –
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause (1) Cause (2) Check and corrective measures
From the previous page
3-4) Travelling torque in Y-direction is ex-
cessive.
4-A) The pulse motor is pressed against the
Y-feed shaft too strongly.
Adjust backlash of the feed motor
gear.
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 setscrew 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 cor-
rectly.
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 Dene the correct crank balancer
position.
6. Malfunction of vertical move-
ment of work clamp foot
6-1) Looseness of work clamp foot/thread
trimmer cam screw
Dene the work clamp foot/thread
trimmer cam position and x the cam.
6-2) Work clamp foot stepping motor mal-
function
2-A) Defective the work clamp foot stepping
motor.
Replace the work clamp foot stepping
motor.
2-B) The work clamp foot stepping motor is
wrongly connected.
Check the connector connections.
6-3) Defective circuit board 3-A) Circuit board programming aw. Replace the circuit board.
3-B) Connector connections are wrongly
made.
Check the connector connections.

JUKI LK-1900B series Specifications

General

Brand	JUKI
Model	LK-1900B series
Category	Sewing Machine
Language	English