– 98 –
2-E) Thread take-up spring tension
Adjust the thread take-up spring.
is too low.
2-F) Length of the remaining
Properly adjust the tension controller No. 1.
needle thread is too long.
2-G)The specified inner hook and
Use the specified parts.
shuttle driver are not used.
4-3) Scratches on the shuttle driver.
Remove the scratches and polish with buff, or replace
the shuttle driver.
4-4) Clearance between the shuttle
Properly adjust the clearance between the shuttle
driver and the inner hook is too small.
driver and the inner hook.
4-5) Scratches on the needle hole
Remove the scratches and polish with buff, or replace
guide.
the needle hole guide.
4-6) Finish of the needle hole is rough.
Replace the needle.
4-7) Thread take-up spring is
7-A) Stroke of the thread take-up
Properly adjust the thread take-up spring.
maladjusted.
spring is too large.
7-B) Thread take-up spring tension
Properly adjust the thread take-up spring.
is too high.
4-8) Rotation of the inner hook is
8-A) Race face of the shuttle is
Remove the inner hook and remove the thread waste.
defective.
clogged with thread waste.
8-B) Oil amount is insufficient.
Supply oil to the shuttle components.
4-9) Needle thread clamp device
9-A) Needle thread length is
Adjust the needle thread length and turn the needle
OFF
inadequate.
thread clamp device ON.
Trouble
Cause (1)
Cause (2)
Check and corrective measures
From the previous page
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 ...