JUKI LK-1900AN Engineer's Manual page 35

Adjustment procedures
1. With the machine in stop mode, remove six setscrews 1 of the
top cover, and take off top cover 2 .
2. Apply L-shaped wrench 3 to socket bolt 5 of clamp 4 , and
loosen the socket bolt.
3. Push down L-shaped wrench 3 to increase the lift of the work
clamp hoot, or pull it up to decrease the lift.
4. After the adjustment, securely tighten socket bolt 5 .
5. If the right and left work clamp feet are not levelled, loosen
fixing screw 7 and adjust the position of the work clamp foot
lever support plate 8 to level them.
(Caution) At this time, be careful not to cause work clamp foot
lever support plate 8 to interfere with feed bracket
9 .
If the work clamp foot levers support plate inter-
feres with the wiper, readjust the height of the wiper
using setscrew !0 in the wiper installing base.
Adjustment procedures
1. Start the test mode CP-6.
2. Tread on the pedal to perform origin retrieval for the thread
trimmer cam.
(Confirm that the origin is in the correct position. Then, proceed
to the procedures shown below. Refer to "(13) Thread trimmer
and presser foot origin sensor adjustment.")
3. Press the + key 4 . Confirm that the display 1 of the operation
panel is changed over from [10] to [00] when the key is pressed
within the range of 6 to 8 times.
4. If the display changeover occurs deviating from the range of 6
times to 8 times, or if the display changeover does not occur at
all, loosen the set screw 2 and make fine adjustments of the
sensor slit 3 in the directions of the arrow.
5. After the sensor slit 3 has been fixed, tread on the pedal and
make origin retrieval for the thread trimmer cam. Examine the
sensor changeover position in the steps 3. and 4. above.
6. Repeat the steps 2. to 5. above until the coincidence is se-
cured.
(Caution) During adjustments, check the clearances A, B, and
C of the sensor slit 3 and the sensor 5 . If the clear-
ances seem to be insufficient, use the set screws
2 and 6 to correct the gradient. While taking this
action, continue to work on the steps above.
Results of Improper adjustment
Results of Improper adjustment
If the thread trimmer sensor
o
changeover takes place outside
the range, the moving knife may
interfere with the needle. This
will be a cause of injury or the
breakage of parts.
If the thread trimmer sensor
o
changeover does not take place,
Error 305 occurs and the sewing
machine fails to start operating.
If the sensor slit 3 has no clear-
o
ance against the sensor 5 , this
can be a cause of destruction in
the sensor slit 3 or the sensor
5 .
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