JUKI LK-1900A, Engineer'S Manual, Page: 37 / 124

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1. Select the test mode No. 2 (CP-2) origin retrieval.
2. Origin retrieval is conducted each time the pedal is trodden on.
Loosen the sensor slit set screw and shift the position of the sen-
sor slit plate . Apply the work feed plate to the origin position.
Refer to “ (21) Position of the mechanical origin.”
(Caution) After adjustments, confirm that the sensor slit plate
does not interfere with the sensor .
Adjustment Procedures
Results of Improper Adjustment
1. Loosen the screw to adjust the clearance between the wiper
and the needle so that this clearance attains 1.5mm or more. Loosen
2. Loosen the screw to adjust Distance A between the wiper end
plane and the needle center until this distance attains the values speci-
fied below. After adjustments, tighten the screw
firmly.
Distance A between the needle center and the wiper end plane
(Amm)
Other thanLK-1903A
: 23mm to 25mm
LK-1903A only : 15mm to 17mm
* The needle stays in the position of the end of sewing and stop.
Adjustment Procedures
Results of Improper Adjustment
o If Distance A is too small, the
presser bar may tread on the
needle thread when the presser
bar is lowered. At that time, the
needle thread may be caught by
the wiper
and the needle may
be broken.
In particular, this must be taken
into consideration when a thin
needle (#11 or less) is used.