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Needle Breakage - Brother HE-800B Service Manual

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11. TROUBLESHOOTING
Cause
Upper thread trimmer
lever

11-17. Needle breakage

Items with a "*" in the "Page" column should only be handled by a qualified technician.
Cause
Needle
Rotary hook
Needle plate
Upper thread trimmer
assembly
Cutter
161
Check
Upper thread trimmer lever
operating force
Check
Needle installation
Needle
bar
height
and
needle bar lift amount
(The gauge is an option
part.)
Gap between the needle
and the tip of the rotary
hook
Needle plate position
Burr on the screw hole
edge (in event of uneven
material feeding)
Needle
strikes
upper
thread trimmer
Clearance between needle
bar and cutter
Remedy
Adjust so that the upper thread trimmer lever opens
gently when the stop plate is separated from the
stopper.
Remedy
As viewed from the direction of the face plate, attach
the needle so that the groove of the needle faces
frontward.
1. Adjust the needle bar height to "1" on the gauge.
2. Adjust the needle and rotary hook timing to "2" on
the gauge.
Adjust the gap between the needle and the rotary hook
tip to 0.01 - 0.08 mm. (Adjust to as large as possible
without causing skipped stitches to occur.)
* Move the needle bar to the left and right with your
finger, and check that the tip of the rotary hook does
not strike the needle.
Adjust the forward/back position of the needle plate so
that the needle is in the center of the needle hole.
Bisect
Polish with buff.
Check the chamfered side
finishing
(Needle plate cross section)
Refer to "11-16. Needle strikes upper thread trimmer".
Install the cutter so that the clearance between the
needle bar and the cutter is 0.3 mm.
* The cutter release section of the needle bar should
be at a right angle to the cutter.
0.3 mm
HE-800B
Page
4013Q
Page
91
89
91
4014Q
4015Q
160, 161
88
4016Q

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Troubleshooting

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