16. TROUBLESHOOTING

Problem

Needle breaks

Presser foot pulse motor is out of step.

Upper shaft cannot be turned manually.

Sewing machine does not start after emergency stop.

Cause

Needle is incorrectly installed.

Needle and rotary hook timing is incorrect.

Buttonhole width or length is incorrect.

Upper thread scissors do not open smoothly.

Upper thread scissors position is incorrect.

Upper thread scissors installation is incorrect.

Bobbin is spinning loosely.

Loop spreader and rotary hook are touching.

Emergency stop switch has not been released.

Check

Needle position

Needle and rotary hook timing

Work clamp

Upper thread scissors opening

Upper thread scissors position

Clearance between upper thread scissors and work clamp

Bobbin insertion method

Thread trimmer mechanism position

Emergency stop switch

Remedy

Page

 

 

 

 

Install the needle

57

correctly.

 

 

Adjust the timing of the

72

needle and rotary hook.

Replace the work

clamp.

Adjust the upper thread

75

scissors opening timing.

Adjust the position of the upper thread scissors.

Install the upper thread

74

scissors correctly.

 

 

Insert the bobbin

60

correctly.

 

 

Move the thread trimmer

30

mechanism to the home

position.

 

 

 

Turn the machine pulley

 

backward to set the needle

30

bar to the needle

up position and then return

to the home position.

 

 

 

Turn the emergency stop

64

switch knob to release it.

Cutter position is incorrect.

Cutter blade damaged. Upper thread scissors do not open smoothly and touch cutter.

Cutter position

Upper thread scissors opening

Adjust the cutter to the

 

center of the needle plate

 

cutter groove.

 

Adjust the upper thread

75

scissors opening timing.

92

HE-8000

Page 99
Image 99
Motorola LH4-B800E, HE-8000 I instruction manual Cause Needle is incorrectly installed

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

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