Brother LH4-B800E Service Manual download pdf (Page 128)

LH4-B800E

5 - 13

5. Troubleshooting guide

5-13. (1)Imperfect cutter function (imperfect material cutting)

(2) Cutter does not return

(3) Cutter and upper thread scissors touch.

O.K.NG

Aligned

Cause Check Solution page

Cutter Cutter position Adjust cutter vertical

height

Install the cutter so that its edge is

aligned with the top of the needle

plate.

4-11

Cutter blade If the blade is worn or

chipped, sharpen it or

replace it.

Replace with the special needle

plate.

(Instruction)

Cutter

solenoid

Check for a

disconnected cord.

Connect the cords. -

Cutter power Memory switches Increase the setting for

memory switch No. 00.

(cutter cutting force).

Increase the setting value for

materials that are heavy or difficult

to cut.

(Instruction)

Solenoid

stopper

Nut Check for a loose nut. Tighten securely. -

Cutter sensor position Adjust the cutter

sensor position.

Check for a loose

mounting screw.

4-9

Cause Check Solution page

Cutter Cutter blade If the blade is worn or

chipped, sharpen it or

replace it.

(Instruction)

Sticks in

material

Needle plate Replace with the

special needle plate.

This needle plate uses the elasticity

of rubber to prevent the knife from

getting stuck and not returning. It

also helps to keep the knife blade

sharp.

4-11

Cause Check Solution page

Upper thread

scissors

Is the cam opening the

stop plate?

If the feed mechanism

operates when the cam

has not opened the

stop plate, the cutter

will bump against the

upper thread scissors.

Adjust the cam

position.

4-18

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Brother LH4-B800E Service Manual Page 128

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