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Error Type
Short upper
Movable blade is too fast
thread after
or too slow to separate
trimming from
upper thread
failure to
separate
Incorrect position of picker
Picker failure
Thread break
Upper thread is too short
before trimming
• check main and sub
tension adjuster on the
tension adjusting plate
• dent or damage to
movable blade
Lower thread is too short
• doesn' t unwind smoothly
• too weak or too elastic
Cause
Adjust insert angle of movable
blade (295° )
Adjust picker position
• Check and change fuse F1, F3
in joint board
• Check and change solenoid
and solenoid connection
• Check connection and change
joint board
Adjust upper thread tension
• remove dent using whetstone
or sandpaper
• change movable blade
• adjust or change bobbin case
spring
• clean/check for dent in thread
guide on the bobbin case
• Change lower thread
Inspection & Repair
Reference
See 11.1.1
See 11.3
Check fuse rating
See 9.1
Check for dent
Too short lower thread
cannot make start
stitches after trimming
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