Mechanical Section- Page 234

12-2

BE-0901E-AC-PC• BE-1201B-AC-PC

Chapter 12 Troubleshooting

Mechanical Section

Problem

Check point

!

Thread breakage

• Is the machine properly threaded?
• Is thread tension too high?
• Is the rotary hook assembly clogged?
• Is there thread in the bobbin?
• Is the needle bent?
• Is there a rough edge or flaw on the needle plate, rotary hook, or

bobbin case that might cut the thread?

• Is the needle installed correctly (direction, angle, etc.)
• Is the presser foot in contact with the material?
• Are the thread thickness and needle size correct?
• Is a thread with right-hand twist being used? (If such a thread is

used, replace with a thread with left-hand twist.)

• Is there any adhesive on the needle?
• Is the material tension too weak?
• Is there too much play between the outer rotary hook and inner

rotary hook?

• Does the outer rotary hook turn smoothly?
• Is the clearance between the rotary hook stopper and the rotary

hook adjusted correctly?

• Does the thread come out from the bobbin case smoothly?

!

Needle (presser foot) interference
with embroidery hoop

• Is the embroidery hoop too small?
• Check the size and needle start position in the sewing data.

!

Needle breakage

• Is the needle attached correctly (direction, height, etc.)?
• Is the needle bent?
• Is the rotary hook attached correctly?
• Is the timing set correctly?
• Is there any backlash with the needle bar case (back/forth and

right/left)?

• Is the rotary hook stopper correctly attached to stop the rotary

hook?

• Is the needle size correct and the tip sharp?
• Does the thread pass through the hole center of the presser

foot?

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!

Not embroidered properly

• Is the material edge caught in the machine?

  (Are embroidery hoop and other related parts operating
correctly?)

• Is the material stretched properly?
• Is thread tension proper?

Does the lower thread come out smoothly?