JUKI lbh-1790 series Engineer's Manual page 33

Adjustment Procedures
1 Adjusting the sensor
Insert a spacer of 3 mm (hexagonal wrench key of 3 mm or the
like) between the presser foot and the throat plate, turn ON
the power in the state that sensor detecting plate 1 is drawn
backward (when PBL Llink 6 is pressed to the rear (direction
of the arrow), hinge screw 7 goes up) loosen setscrews 2 in
the installing plate, move presser lifter sensor installing plate
3 in the direction of the arrow mark, and fix setscrews 2 in
the installing plate at the position where LED of presser lifter
origin sensor starts lighting up.
When the adjustment cannot be performed, loosen setscrews
4 in the detecting plate and tilt sensor detecting plate 3 for
adjustment.
2 Presser lifter motor origin compensation
1. Press MODE key 4
to enter memory switch level 2 of the adjustment mode.
with ITEM SELECTION key !0
2. Select K17
3. When the existing set value is changed with DATA CHANGE
key !1
, the origin sensor moves to the position of
the set value.
Set value can be set within the range of -100 to 10.
4. Every time STOP button is pressed during setting the origin
compensation value, the move from the position of existing
compensation value to that of compensation value "0" is
repeatedly performed.
5. When the setting item of
SELECTION key !0
is memorized in EEPROM of the machine head and the
presser lifter motor origin compensation is completed.
for approximately three seconds
K17 is changed with ITEM
, the origin compensation value
28
− −
Results of Improper Adjustment
™ W h e n t h e a d j u s t m e n t i s
improper, the number (display)
on the panel is different from the
actual height of the presser.
™ When the number (display) on
the panel is excessively different
from the actual height of the
presser, step-out of presser lifter
motor occurs, and the presser
may not be fully lowered.
.