Brother BAS-705 - Page 80

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