JUKI LU-1510N-7 Engineer's Manual page 78

Troubles
From the previous page
Both needle and bobbin
thread cannot be trimmed.
Causes
The blades of moving
knife and counter knife
have been improperly
adjusted.
Counter knife pressure
is excessively low.
Moving knife fails to
work.
Presser foot drops
from cloth at the time
of thread trimming.
– 74 –
Checking
Refer to "(22)-4) Adjusting the
knife pressure".
Refer to "(22)-4) Adjusting the
knife pressure".
Refer to "Adjusting the synchro-
nizer timing".
Refer to "(22)-5), and 6) "Thread
trimmer cam and Thread trimmer
cam timing".
Air pressure is excessively low.
Adjust the air pressure (Adjust it
to 0.5 Mpa or more.)
Replace the thread trimmer
solenoid.
Perform thread trimming on cloth.
Corrective measures