16. TROUBLESHOOTING

16. TROUBLESHOOTING

Problem

Upper thread breaks

Lower thread breaks

Skipped stitches

Poor thread tightening

Cause

Burrs in needle hole.

Needle is incorrectly installed.

Threading is incorrect.

Upper thread tension is too strong.

Thread is too thick for the needle hole.

Lower thread tension is too strong.

Bobbin case threading is incorrect.

Needle is incorrectly installed.

Threading is incorrect.

Needle and rotary hook timing is incorrect.

Clearance between Needle and rotary hook is too large.

Needle bar height is incorrect.

Lower thread tension is too strong.

Thread in bar tacking area is not tight.

Thread in zigzag sewing area is not tight.

Check

Needle

Needle position

Threading

Main and auxiliary tension

Needle and thread

Lower thread tension

Bobbin case threading

Needle position

Threading

Needle and rotary hook timing

Needle and rotary hook clearance

Needle bar height

Lower thread tension

Tension at tack tension

Tension at zigzag tension

Remedy

Page

 

 

 

 

Replace the needle.

57

 

 

 

 

Install the needle

57

correctly.

 

 

Thread the upper

58

thread correctly.

 

 

Adjust to an

61

appropriate tension.

 

 

Replace the needle with

 

one that is suitable for

 

the thread.

 

 

 

Adjust to an

61

appropriate tension.

 

 

Thread the bobbin

60

correctly to match the

sewing.

 

 

 

Install the needle

57

correctly.

 

 

Thread the upper

58

thread correctly.

 

 

Adjust the timing of the

72

needle and rotary hook.

 

 

 

 

Adjust the clearance

72

between the needle and

rotary hook.

 

 

 

Adjust the height of

71

the needle bar.

 

 

Adjust to an

61

appropriate tension.

 

 

Adjust the tack

61

tension.

 

 

Adjust the zigzag

61

tension.

Clearance between inner

 

Clearance between inner

rotary hook and rotary hook

 

rotary hook and rotary hook

holder is incorrect.

 

holder

Adjust the clearance be-

73

tween the inner rotary hook

and rotary hook holder.

 

HE-8000

91

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Motorola LH4-B800E, HE-8000 I instruction manual Troubleshooting

LH4-B800E, HE-8000, HE-8000 I specifications

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