20
Correct Condition
LCD displays “SC 08”.
Step and items
to check
08)
Foot control
Procedure
Attach the foot control to the
sewing machine.
Depress the foot control as far as it
goes, then release it.
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
The foot control
symbol does not
appear.
Buzzer does not sound.
–REMEDY–
Replace the foot
control.
Replace the switching
regulator.
Replace the printed circuit
board A.
Shift the slide volume from left to right,
then return 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.
09)
Slide volume
Press the needle up/down 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.
The foot control symbol appears when the
foot control is attached.
Buzzer sounds when the foot
control is deeply depressed.
Buzzer sounds when the foot
control is relEased.
LCD displays “SC 09”.
10)
DC motor
11)
Solenoid
12)
Thread cutter
motor,
Thread cutter
button
Buzzer sounds at right or left position.
LCD displays “SC 10”.
Buzzer does not sound.
–REMEDY–
Replace the printed circuit
board A.
The machine motor does not
start.
The motor stops immediately.
The motor runs
unstable.
–REMEDY–
Replace the DC motor.
Replace the printed circuit
board A.
SELF-DIAGNOSTIC TEST
Machine runs slow, then fast, and the
needle bar stops at its highest position.
Lower the presser foot.
Press the needle up/down 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.
LCD displays “SC 11”.
Press the needle up/down position
button to display “on” or “of”(off).
Thread tension disc opens while the
LCD displays “on”.
The thread tension disc does
not open.
–REMEDY–
Replace the solenoid
Replace the circuit board A.
Turn the handwheel toward you to
raise
the needle bar at its highest position.
Press the needle up/down 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.
LCD display “12”.
Thread cutter motor wii be initialized.
Press the thread cutter button.
The thread cutter icon will appear and
blink as long as the thread cutter
button is pressed.
The thread cutter motor does
not work.
Thread cutter symbol does
not appear when the thread
cutter button is pressed.
Thread cutter symbol
appears when the thread
cutter button is not pressed.
–REMEDY–
Replace the thread cutter
motor.
Replace the thread cutter
switch.
Replace the circuit board A.
