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HE-800A
16. TROUBLESHOOTING
103
Cause Check Remedy Page
Longitudinal feed
arm
Installation position of the
longitudinal feed arm
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.
-
Needle bar height in
machine stopped
condition
Upper shaft pulley
stopping position
Adjust the needle up sensor position.
77
Cam Upper thread scissors
opening timing
Adjust so that the cam opens the stop plate
properly.
76
Upper thread scissors
gradual opening timing
Adjust the timing so that the upper thread scissors
gradually start opening when the feed mechanism
moves about 1.5 - 2.5 mm.
76
Opening cam
Upper thread scissors
operation
Apply grease to the inclined face of the opening
cam.
76
Work clamp home
position sensor
Work clamp home
position sensor position
After setting the sewing machine to the 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.
-
Upper thread
trimmer lever
Upper thread trimmer
lever operating force
Adjust so that the upper thread trimmer lever opens
gently when the stop plate is separated from the
stopper.
-
ውዒ
-
ውዓ
. Needle breakage
Cause Check Remedy Page
Needle Needle installation As viewed from the direction of the face plate, insert
needle fully into needle bar so that the notched part
of needle faces frontward.
57
Needle bar height and
needle bar lift amount
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.
72, 73
Rotary hook
Gap between needle and
rotary hook
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.
73
4011Q
4012Q
Aligned
Upper thread
trimmer lever
Washer
5.5 – 6.0 mm
4013Q