Mitsubishi Electric PLK-J10050RH, Technical Manual

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(6) Turn the hand pulley and stop it at the position where the needle bar lifted 4.5 mm from its lowest
position. Turn the hook by hand and stop it at the position where the hook point meets with the center
line of the needle. After the completion of setting, press the icon and then press the
icon.
NOTICE The needle bar of this sewing machine does not have timing mark. Please refer to above
description when setting the needle bar position.
(7) Press the home position return icon . After completing the origin return operation,
press the on the standard screen. Turn the hand pulley by hand and make sure the timing
between hook and needle motion is performed sufficiently as described above.
(8) After adjustment turn the power switch off.
(9) After adjustment, put the sliding plate and bobbin case to the original locations and close the bobbin
access door.
(10) When put the sliding plate back on the sewing machine, in order for the needle (No.1) to come into
the right center of the needle hole of the needle plate (No.2), make sure that the needle plate hole
center matches with the needle point then, tighten the set screws.
<1>: Needle
<2>: Center of the needle hole
<1>
<2>