38
Thread
cutter
symbol
LCD displays “13” and “Cut”.
The thread cutter symbol will blink, and
thread cutter motor will be initialized.
13)
THREAD
CUTTER
MOTOR,
THREAD
CUTTER
SOLENOID
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.
Thread cutter motor does
not work.
LCD displays “E4”.
–REMEDY–
Replace the thread cutter
motor.
Adjust the sensor plate
position.
Replace the printed
circuit board A.
Thread cutter symbol
does not change.
14)
FEED DOG
Turn the drop feed lever to the
right.
Turn the drop feed lever 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.
LCD displays “14” and feed dog symbol.
When the drop feed lever is shifted
away from you, LCD displays as Fig. 1.
When the drop feed lever is shifted
toward you, LCD displays as Fig. 2.
Fig. 1
Feed
dog
symbol
Fig. 2
Buzzer does not sound.
–REMEDY–
Replace the drop feed dog
lever unit.
Replace the printed circuit
board A.
LCD does not change.
LCD displays “PSErr”.
12)
THREAD
TENSION
RELEASE
SOLENOID
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 “12”, “SO” and “–off”.
Press the needle up/down button to
switch the solenoid on or off.
[ON]
Buzzer sounds and the thread tension
disk opens, and LCD displays “--on”
while the thread tension disk opens.
The thread tension disk will be closed
automatically 5 seconds after the
thread tension released.
[OFF]
Buzzer sounds and the thread tension
disc closes, and LCD displays “–off”.
The Thread tension disk
does not open.
–REMEDY–
Replace the solenoid.
Replace the circuit board
A.
PROCEDURE
CORRECT CONDITION
DEFECTIVE CONDITION
STEP AND
ITEMS TO
CHECK
Diagnosis test
