Brother BAS-342G Instruction Manual download pdf (Page 80)

13. TROUBLESHOOTING

BAS-342G

Problem Cause Remedy Reference

Upper thread tension is too strong. Adjust the upper thread tension. P. 24

Needle is incorrectly installed. Install the needle correctly. P. 19

Thread is too thick for the needle. Select a thread that matches the needle. P. 24

Thread take-up spring tension and

height are incorrect.

Adjust the tension and height of the

thread take-up spring.

P. 55

Damage or burring of the rotary hook,

needle hole plate or needle.

Repair or replace the problem part.

Thread breaking from heat (Synthetic

thread)

Use a cooling tank. P. 20

Upper thread breaks.

Thread is threaded incorrectly. Thread the thread correctly. P. 20

Lower thread tension is too strong. Adjust the lower thread tension. P. 24

Lower thread breaks.

Damage to corners of needle hole plate

or bobbin case.

Repair or replace the problem part.

Clearance between needle and rotary

hook tip is too great.

Adjust the needle clearance. P. 57

Needle and rotary hook timing is

incorrect.

Adjust the needle bar lift amount. P. 56

The driver is covering the needle more

than necessary.

Adjust the driver needle guard. P. 57

Needle is bent. Replace the needle.

Skipped stitches occur.

Needle is incorrectly installed. Install the needle correctly. P. 19

Adjust the needle clearance. P. 57

Clearance between needle and rotary

hook tip is too great.

Adjust the needle bar lift amount. P. 56

Needle is bent. Replace the needle.

Needle deflection

Select a needle that is suitable for the

sewing conditions.

Reduce the sewing speed.

P. 24

P. 30

Needle is broken.

Needle is too thin.

Select a needle that is suitable for the

sewing conditions.

P. 24

Thread take-up spring tension and

height are incorrect.

Adjust the tension and height of the

thread take-up spring.

P. 55

Needle and rotary hook timing is

incorrect.

Adjust the needle bar lift amount. P. 56

Thread jamming.

Shuttle race thread guide is not

separating the threads.

Adjust the position of the shuttle race

thread guide.

P. 57

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Brother BAS-342G Instruction Manual Page 80

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