Brother BAS-311G Troubleshooting, Problem, Cause, Remedy, Reference, Work clamp does not, lift

10. TROUBLESHOOTING

10. TROUBLESHOOTING

•Please check the following points before calling for repairs or service.

•If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase.

CAUTION

Turn off the power switch and disconnect the power cord before carrying out troubleshooting.

If the foot switch is depressed by mistake, the sewing machine might start operating and injury could result.

Problem

Cause

Remedy

Reference

Work clamp does not

Work clamp moves stiffly.

Apply a suitable amount of grease to the

lift.

sliding parts of the work clamp.

Air tube of presser lifter cylinder is bent

Straighten the bend in the tube or

or damaged (Pneumatic specifications).

replace the tube.

Work clamp does not

Work clamp moves stiffly.

Apply a suitable amount of grease to the

drop.

sliding parts of the work clamp.

Air tube of presser lifter cylinder is bent

Straighten the bend in the tube or

or damaged (Pneumatic specifications).

replace the tube.

Work clamp lift amount

Work clamp lift amount setting at

Change the work clamp lift amount

Instruction

is incorrect.

operation panel is incorrect (Solenoid

setting.

manual

specifications).

Work

clamp

arm

lever

position

is

Adjust the position of the work clamp

P. 100

incorrect. (Pneumatic specifications)

arm lever.

Work clamp does not

Work

clamp arm

stopper

position

is

Adjust the position of the stopper.

P. 85

lift to

the maximum

incorrect (Solenoid specifications).

height.

Cylinder

joint

position

is

incorrect.

Adjust the position of the cylinder joint.

P. 85

(Pneumatic specifications)

Thread

wiper

does

Adjust the height of the thread wiper.

P. 97

not operate correctly.

The thread wiper is obstructing the

needle.

Adjust the stroke of the thread wiper.

P. 97

Thread wiper position is incorrect.

Adjust the stroke of the thread wiper.

P. 97

Lower

thread

winds

Bobbin winder tension assembly height

Adjust the height of the bobbin winder

Instruction

to one side.

is incorrect.

tension assembly.

manual

Lower thread winding

Bobbin presser position is incorrect.

Adjust the position of the bobbin presser.

Instruction

amount is incorrect.

manual

Thread

slips

out of

Stitches

being

skipped

at

the sewing

Refer to "Skipped stitches occur".

P. 142

the needle.

start.

Upper thread length is irregular.

Adjust the sub-tension.

Instruction

manual

Position of shuttle race thread guide is

Adjust the position of the shuttle race

P. 92

incorrect

thread guide.

BAS-311G, BAS-326G 141