Needle Breakage - Brother HE-800A User Manual

16. TROUBLESHOOTING
Cause
Longitudinal feed Installation position of the
arm longitudinal feed arm
Needle bar height in Upper
machine stopped stopping position
condition
Cam Upper
opening timing
Opening cam Upper
gradual opening timing
Upper
operation
Work clamp home Work
position sensor position sensor position
Upper thread Upper
trimmer lever lever operating force
-

. Needle breakage

Cause
Needle Needle installation
Rotary hook Needle bar height and
needle bar lift amount
Gap between needle and
rotary hook
103
Check
Move the upper thread trimmer driving link so that it
stops at the face plate. In this position, tighten the
bolts so that the small slot in the upper thread
trimmer lever and the edge of the washer are
aligned.
shaft pulley Adjust the needle up sensor position.
thread scissors Adjust so that the cam opens the stop plate
properly.
thread scissors Adjust the timing so that the upper thread scissors
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
thread scissors Apply grease to the inclined face of the opening
cam.
After setting the sewing machine to the home
clamp home
position, press the RESET key and then adjust the
distance between the upper thread trimmer and the
center of the needle when the work clamp is
lowered to 5.5 - 6.0 mm.
Adjust so that the upper thread trimmer lever opens
thread trimmer
gently when the stop plate is separated from the
stopper.
Check
As viewed from the direction of the face plate, insert
needle fully into needle bar so that the notched part
of needle faces frontward.
Adjust the needle and hook timing.
1. Adjust the needle bar height to "1" on the gauge.
2. Adjust the needle bar lift amount to "2" on the
gauge.
Adjust the gap between needle and rotary hook to
0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Check that rotary hook point does not strike
needle in zigzag motion.
HE-800A
Remedy
Aligned
Upper thread
trimmer lever
Washer
4011Q
5.5 – 6.0 mm
4012Q
4013Q
Remedy
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