To Adjust And Replace Needle Plate Sensor Switch - ELNA Elinita EF72 Service Manual

To adjust and replace needle plate sensor switch

(View from the rear bottom side)
Needle plate sensor
Needle plate
setting plate
sensor switch
cable
Needle plate replacing bar
Auto-lock key
Needle up/down key
(Numeral key)
Rear side
Needle plate sensor switch
Setscrew A
Needle plate
sensor switch
(Switch setting
plate)
Setscrew B
4 mm
(Factory setting mode)
(Sensor adjusting mode)
To replace:
To remove:
1. Remove the base. (Refer to page 2)
2. Remove the front cover. (Refer to page 4)
3. Disconnect the needle plate sensor switch connector
from the printed circuit board A.
4. Remove the setscrews A (2 pcs.) and remove the
needle plate sensor setting plate.
5. Remove the setscrew on the needle plate sensor
switch and remove the needle plate sensor switch.
To attach:
6. Attach the needle plate sensor switch to the needle
plate sensor setting plate and tighten the setscrew B
lightly.
* The needle plate sensor switch should be 4 mm to
the front from the needle plate sensor setting plate.
7. Tighten the setscrews A (2 pcs.) to fix the needle plate
sensor setting plate.
8. Connect the needle plate sensor switch connector to
the printed circuit board A.
9. After the "To adjust and check" procedure below,
tighten the setscrew B securely.
To adjust and check:
1. Prepare the standard needle plate and the needle
plate for straight stitch.
2. Turn the power switch on while pressing the auto-
lock key and needle up/down key to enter the factory
setting mode.
3. Press the numeral key "4" to select the sensor
adjusting mode.
4. Check if the indication of "Straight" is "L" and the
indication of "Zigzag" is "H" when the standard needle
plate is attached.
5. Check if the indication of "Straight" is "H" and the
indication of "Zigzag" is "L" when the needle plate for
straight stitch is attached.
If the indication of "Straight" or "Zigzag" is not correct,
adjust the position of the needle sensor switch.
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