21
CORRECT CONDITION
LED displays “7 ”.
STEP AND
ITEMS TO
CHECK
07)
FOOT
CONTROL
PROCEDURE
Attach the foot control to the
machine.
Depress the foot control as far as
it goes, then release it.
If the result is correct condition,
press the MODE key 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 (foot control
socket).
Replace the circuit board A.
Shift the slide volume from left to
right, then return to the left.
If the result is correct condition,
press the MODE key to proceed
the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
08)
SLIDE VOLUME
Press the needle up/down button.
If the result is correct condition,
press the MODE key to proceed
the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
The “7F” appears when the foot
control is attached.
Buzzer sounds when the foot control
is deeply depressed.
Buzzer sounds when the foot control
is released.
LED displays “8 ”.
09)
DC MOTOR
Buzzer sounds at rightmost or
leftmost position.
LED displays “9 ”.
Buzzer does not sound.
–REMEDY–
Replace the circuit board A.
The machine motor does
not start.
The motor stops
immediately.
The motor runs unstable.
–REMEDY–
Replace the DC motor.
Replace the circuit board A.
SELF-DIAGNOSTIC TEST
Machine runs slow, then fast, and
stops.
LED displays “OK” when the
machine is correct condition.
LED displays “NG” when the
machine is defective condition.
