Brother BAS-705 Instruction Manual page 80

Problem
Poor seam finish on
reverse side of material.
Incorrect thread
tightness.
The synchronizing error
code (E-320) is being
displayed.
Upper shaft motor does
not operate.
Motor abnormality error
code (E-330) is
displayed.
Lower shaft motor does
not operate
Feed mechanism cannot
return to home position.
NOTE: Tripping of the servo driver can be checked by the flashing of the servo driver LED.
Cause
Shuttle race thread
guide is not separating
the threads.
Upper thread is not
properly tight.
Uneven upper thread
length.
Upper thread tension is
too weak.
Lower thread tension is
too weak.
Thread take-up spring
tension and height are
incorrect.
The thread to become
tangled.
Thread scraps on
surface of race.
Bobbin case is not
installed correctly.
Disconnected harness
connector or open circuit
in connector
Upper shaft servo driver
*
has been tripped.
Disconnected harness
connector or open circuit
in connector
Lower shaft servo driver
*
has been tripped.
Oil adhering to home
position sensor
Check
Shuttle race thread
guide position
Upper thread tension
Upper thread length
Upper thread tension
Lower thread tension
Thread take-up spring
tension and height
Refer to the "Thread to
become tangled" section.
Surface of shuttle hook
race
Bobbin case
Upper shaft motor
harness
Upper shaft servo driver
Surface of shuttle hook
race
Lower shaft motor
harness
Lower shaft servo driver
Lower shaft servo driver
Home position sensor
and sensor dog
77
10. TROUBLESHOOTING
Remedy
Adjust the position of the
shuttle race thread guide.
Adjust the upper thread
tension.
Adjust the sub-tension.
Adjust the upper thread
tension.
Adjust the lower thread
tension.
Adjust the tension and
height of the thread
take-up spring.
Refer to the "Thread to
become tangled" section.
Clean away the thread
scraps and dust.
Install the bobbin case
correctly.
Insert the connector securely or
repair the harness.
Turn the power off, wait 15
seconds and then turn it on
again.
Turn the power off and clean
away the thread scraps and dust
from the shuttle hook surface.
Turn the power off and clean
away the thread scraps and dust
from the shuttle hook surface.
Turn the power off and clean
away the thread scraps and dust
from the shuttle hook surface.
Turn the power off and clean
away the thread scraps and dust
from the shuttle hook surface.
Clean off the oil.
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BAS-705