Brother LH4-B800E Service Manual download pdf (Page 118)

LH4-B800E

5 - 3

5. Troubleshooting guide

Cause Check Solution page

Needle Needle facing Refer to "5-1. Needle thread breakage"

Needle installation

height

Bent needle

Blunt needle tip or burr

Thin needle Replace needle Use a needle with a count that

matches the thread and material.

Thread take-

up spring

Thread take-up spring

tension and stroke

Refer to "5-1. Needle thread breakage"

Upper

clamping foot

Upper clamping foot

pressure

Increase upper

clamping foot pressure

Presser adjustment screw height is

approximately 30 mm, so tighten it.

4-8

Relation between

upper clamping foot

and sewing length

Replace upper

clamping foot that fits

for sewing length

When using knits or woven

materials, replace the parts with the

-3 specification parts;

Length feed plate (for subclass -3)

Upper clamping foot (for knits)

Needle plate 1.2 (for subclass -3)

Rotary hook Blunt rotary hook point Polish with buff

Replace 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

Tension Strength of sub thread

tension (zigzag

portion)

Adjust the upper thread

tension to the

appropriate tension.

(Instruction)

Needle bar

play

Vertical and

longitudinal needle bar

play

Reduce the needle bar

play, or replace the

parts.

Lower thread

clamp

Lower thread retainer

cam should be sitting

firmly on lower thread

clamp plate roller.

Refer to "4-14. Adjusting the lower thread trimming"

Thread scraps and

dust blocking area

around lower thread

clamp and lower

thread presser

Clean around the lower

thread presser.

Needle plate Material and needle

plate

When using knit

material, replace with

the -3 needle plate.

Replace with a needle

plate with a smaller

needle hole.

Using the thin -5 needle plate and

flat work clamp can be effective.

Joint sewing Angle of work clamp

means that material is

not being clamped.

Replace with short

work clamp that

matches the sewing

length.

Use the accessory

auxiliary sheet.

Process the work clamp assembly

to match the joint section.

(Attach or remove rubber.)

4-16

5-2. Skipped stitches

Approx. 30 mm

(Approx. 30 N)

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 167 168

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Brother LH4-B800E Service Manual Page 118

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