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3-5) Inadequate adjustment of the
Adjust the X sensor position correctly.
X sensor position
3-6) Inadequate adjustment of the
Adjust position of the Y slit plate correctly.
Y slit plate
4. Sewing machine locked
4-1) Large needle compared with
Replace the needle hole guide.
the hole diameter of the needle
hole guide
5. Severe vibration
5-1) Inadequate crank balancer
Define the correct crank balancer position.
positioning
6. Malfunction of vertical movement
6-1) Looseness of thread trimmer
Define the thread trimmer cam position and fix the cam.
of work clamp foot
cam screw
6-2) Presser pulse motor malfun-
2-A) Defective the presser pulse
Replace the presser pulse motor.
ction
motor.
2-B) The presser pulse motor is
Check the connector connections.
wrongly connected.
6-3) Defective circuit board
3-A) Circuit board programming
Replace the circuit board.
flaw.
3-B) Connector connections are
Check the connector connections.
wrongly made.
Trouble
Cause (1)
Cause (2)
Check and corrective measures
From the previous page
Summary of Contents for LK-1900A
Page 20: ... 16 10 Hook adjustment Standard Adjustment 0mm 0mm 7 5mm 0 05 0 1mm For DPX5 For DPX17 ...
Page 90: ... 86 Grease Grease Grease Grease Grease 8 Needle thread clamp mechanism area ...
Page 91: ... 87 Grease Grease A Grease Grease Grease Grease 9 LK 1901A relations ...
Page 92: ... 88 10 LK 1903A relations Grease Grease ...
Page 114: ... 111 12 Circuit diagrams 1 Block diagram A ...
Page 115: ... 112 2 Power supply circuit diagram A ...
Page 116: ... 113 3 Power supply circuit diagram B ...
Page 117: ... 114 4 Power supply circuit diagram C ...
Page 118: ... 115 5 Servo motor circuit diagram ...
Page 119: ... 116 6 Sensor pedal VR circuit diagram ...
Page 120: ... 117 7 MAIN PANEL board circuit diagram ...
Page 121: ... 118 8 Motor solenoid circuit diagram Thread trimmer Lifting the work clamp foot motor ...