12-10
Error Type
Cause
①
Poor connection of sensor
②
Bad circuit board
③
Bad sensor and sensor
position.
Dirty area around the
sensor.
①
Movable blade is too fast or
too slow to separate the
upper thread
②
Movable blade and rotary
hook are too close or too
far
③
Incorrect position of picker
④
Picker failure
①
Upper thread is too short
�
check main and sub
tension adjuster
�
dent or damage to
movable blade
Check connection
Change circuit board
�
change sensor
�
clean around the sensor
�
adjust location of the sensor
unit
Adjust insert angle of movable
blade (295
�
)
Adjust the distance
Adjust picker position
�
Check and change fuse
~
�
Check/change solenoid and
solenoid connection
�
Check connection and change
circuit board at the back of the
control box
Adjust upper thread tension
�
remove dent using whetstone
or sandpaper or change
movable blade
Inspection & Repair
See 11-1-4 (p.11-3)
See 11-1-1 (p.11-1)
See 11-1-3 (p.11-2)
See 11-2 (p.11-3)
Check fuse spec.
1) 3-phase:
,
= 250V 15A
2) 1-phase:
,
= 250V 30A
Reference
Trimmer return
failure
Short upper
thread after
trimming due to
separation
failure
Thread break
before trimming
Check
for dent