37
CORRECT CONDITION
LCD displays “08” and “FC”.
LCD displays “09”, “Fcut” and “-oFF”.
STEP AND
ITEMS TO
CHECK
08)
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 start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Attach the thread cutter switch to
the machine.
Depress the thread cutter switch
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 machine
socket (foot control
socket).
Replace the circuit board
A.
Buzzer does not sound.
LCD does not display the
“Fcut--on”
.
–REMEDY–
Replace the
thread
cutter switch
.
Replace the machine
socket (
thread cutter
switch
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 start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
10)
SLIDE
VOLUME
09)
FOOT CUT
(THREAD
CUTTER
SWITCH)
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 or released.
Buzzer sounds when the foot control is
connected or disconnected.
Buzzer sounds and “--on” appears
when the thread cutter switch is deeply
depressed.
LCD displays “10” and “Slide”.
11)
DC MOTOR
Buzzer sounds and “ ” mark appears at
the leftmost position.
Buzzer sounds and “ ” mark appears at
the rightmost position.
Buzzer does not sound.
The “ ” marks appears
in opposite way.
The “ ” marks does not
appear.
–REMEDY–
Replace the circuit board
A.
The machine motor does
not start.
The motor runs unstable.
–REMEDY–
Replace the DC motor.
Replace the circuit board
A.
Machine runs slow, then fast, and the
needle bar stops at its highest position.
Foot control
symbol
LCD displays “11” and “DC”.
Diagnosis test