19
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 right, buzzer sounds and
LCD displays the bobbin symbol.
CORRECT CONDITION
Sewing lamp and LCD backlight lit.
LCD displays “01 ----”.
01)
FUNCTION OF
LCD, BUZZER
AND LAMP
PROCEDURE
Turn on the power switch while
simultaneously pressing the
auto-lock button and needle up/
down button.
Press the start/stop button to
enter the self-diagnostic mode.
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.
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.
Replace the circuit board L.
Buzzer sounds.
LCD displays sym-
bols and numbers and blinks.
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 “S6” WHEN BUTTON 3 IS
PRESSED.
LCD DISPLAYS “S8” WHEN BUTTON 4 IS
PRESSED.
LCD DISPLAYS “S9” WHEN BUTTON 5 IS
PRESSED.
LCD displays “SC 03--”.
BH symbol
Bobbin symbol
Press buttons 1– 5.
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.
Move the buttonhole 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.
1
5
4
3 2
02)
BUTTON
03)
BUTTONHOLE
SENSOR
SELF-DIAGNOSTIC TEST
STEP AND
ITEMS T
O
CHECK
04)
BOBBIN
WINDER
SWITCH
When the buttonhole lever is pulled,
buzzer sounds and LCD displays BH
symbol.
Buzzer does not sound.
LCD does not display the
number correctly.
–REMEDY–
Replace the circuit board A.
Replace the circuit board F2.
Buzzer does not sound.
BH symbol does not appear.
–REMEDY–
Adjust the BH lever sensor
position.
Replace the BH lever
sensor.
Replace the circuit board A.
Buzzer does not sound.
Bobbin symbol is not dis-
played.
–REMEDY–
Adjust the bobbin winder
switch position.
Replace the bobbin winder
switch.
Replace the circuit board A.
When the bobbin winder spindle is
moved to the left, buzzer sounds and
bobbin symbol disappear.
