Brother LH4-B800E Service Manual download pdf (Page 127)

LH4-B800E

5 - 12

5. Troubleshooting guide

5-12. Needle breakage

Bisect

0.3 mm

O.K.

Check the chamfered side

finishing

(Needle plate cross section)

Cause Check Solution page

Needle Needle facing Reattach needle

properly

As viewed from the direction of the

face plate, attach needle so that the

notched part of needle faces

frontward

(Instruction)

Rotary hook Needle height when

rotary hook point

aligned with needle

center

(Needle bar height and

needle bar rise)

Refer to "5-1. Needle thread breakage"

Gap between needle

and rotary hook

Needle plate Needle plate position Adjust needle plate

front and rear position

Locate the needle at the center of

needle hole

Burr on the screw hole

edge (in event of

uneven material

feeding)

Polish with buff -

Upper thread

trimmer

assembly

Needle strikes upper

thread trimmer

Adjust so that the

scissors do not touch

the needle.

Refer to "5-11. Needle strikes upper thread

trimmer"

Cutter Clearance between

needle bar and cutter

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.

4-6

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Brother LH4-B800E Service Manual Page 127

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