19
Correct Condition
Sewing lamp and LCD backlight lits.
LCD displays “01”.
Step and items
to check
01)
Function of
LCD, buzzer
and lamp
Procedure
Turn on the power switch while
simultaneously pressing the start/stop
button and locking stitch button.
Press the start/stop button.
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
Sewing lamp does not lit.
LCD backlight does not lit.
LCD does not display “01”.
Buzzer does not sound.
LCD does not turned on.
LCD does not display any
symbols or not in order.
–REMEDY–
Replace the circuit board A.
Buzzer sounds.
LCD displays symbols and numbers in order.
LCD repeats displaying after all symbols and
numbers are shown.
Press buttons 1– 7.
LCD displays “SC 02”.
Buzzer sounds when button is pressed.
Button number is displayed when the
button is pressed.
LCD displays “S3” when button 1 is pressed.
LCD displays “S4” when button 2 is pressed.
LCD displays “S5” when button 3 is pressed.
LCD displays “S6” when button 4 is pressed.
LCD displays “S7” when button 5 is pressed.
LCD displays “S8” when button 6 is pressed.
LCD displays “S9” when button 7 is pressed.
LCD displays “SC 03”.
When the buttonhole lever is pulled, buzzer
sounds and LCD displays BH symbol.
When the buttonhole lever is pushed,
buzzer sounds and LCD displays BH
symbol.
LCD displays "SC 04".
When the bobbin winder spindle is moved to
the left, buzzer sounds.
When the bobbin winder spindle is moved to
the right, buzzer sounds and LCD displays
the bobbin symbol.
BH symbol
Bobbin symbol
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.
Lower
the buttonhole lever.
Movethebuttonhole
lever back and
forth.
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.
Buzzer does not sound.
LCD does not display the
number correctly.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
Buzzer does not sound.
BH symbol does not appear.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
Buzzer does not sound.
Bobbin symbol is not
displayed.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F.
1
4
3
2
7 6
5
02)
Button
03)
Buttonhole
Sensor
04)
Bobbin winder
switch
Self-diagnostic Test
