19
Correct Condition
LCD displays “03”.
When the buttonhole lever is pulled,
buzzer sounds.
When the buttonhole lever is pushed,
LCD displays BH symbol.
BH
symbol
* LCD displays “04”.
When the bobbin winder spindle is
moved, buzzer sounds.
When the bobbin winder spindle is
moved to the right, LCD displays the
bobbin symbol.
When the left
When the right
LCD displays “05”.
Buzzer sounds when presser foot lifter is
raised or lowered.
The presser foot symbol appears when
the foot lifter is lowered.
Presser foot
symbol
LCD displays “06”.
Turn the handwheel.
LCD displays stitch width symbol when
the needle bar is at zigzag phase.
Stitch width
symbol
LCD displays stitch length symbol when
the needle bar is at feed phase.
Stitch length
symbol
Step and
items to check
03)
Buttonhole
Sensor
04)
Bobbin winder
switch
05)
Presser foot
lifter switch
06)
Upper shaft
positioning
sensor
Self-diagnostic Test
Procedure
Lower the buttonhole lever.
Pull the buttonhole lever toward
you.
Release the buttonhole lever.
Push the buttonhole lever away
from you.
Release the buttonhole lever.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Move the bobbin winder spindle
to the right.
Return it to the left.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Raise or lower the preser foot
lifter.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Turn the handwheel toward you.
Lower the needle bar from its
highest to its lowest position.
Raise the needle bar from its
lowest position to its highest
position.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Defective Condition
Buzzer does not sound.
BH symbol does not appear or
does not disappear.
q
Adjust the buttonhole
sensor position.
w
Replace the buttonhole
sensor
e
Replace the circuit board A.
Buzzer does not sound.
Bobbin symbol is not
displayed.
q
Adjust the bobbin winder
switch position.
w
Replace the bobbin winder
switch
e
Replace the circuit board A.
Buzzer does not sound.
The presser foot symbol does
not appear when the presser
foot is lowered, or does not
disappear when the presser
foot is raised.
q
Adjust the presser foot lifter
switch position.
q
Replace the presser foot
lifter switch.
e
Replace the circuit board A.
Buzzer does not sound.
Stitch width or length symbol
does not appear.
q
Replace the circuit board P.
w
Replace the circuit board A.
