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“Reverse” Key.
7
DIAGNOSIS CHART
Step
Test operation
Correct condition
Defect condition
9.
Step Foot
control.
1 Depress the foot
control as far as it
will go. Then
release it.
1 Buzzer sounds and LCD
shows (controller).
2 Buzzer sounds when the
foot controller is
depressed and released.
If not working properly, replace
the following parts in order
and recheck.
5. Foot control.
6. Machine socket.
7. Printed circuit board A.
10. Step Speed
control lever.
1 Move the speed
control lever from
the leftmost
position to the
rightmost position.
1 Buzzer sounds and LCD
shows (Volume).
2 Buzzer sounds at the
leftmost and the rightmost
positions.
If not working properly, replace
the following parts in order
and recheck.
1. Printed circuit board K.
2. Printed circuit board A.
11. Step
Buttonhole.
1 Press the Reverse
button.
1 Buzzer sounds and LCD
shows (DC Motor).
2 The machine runs at low
speed, then at high speed
and stops at the highest
position automatically.
If machine does not work
properly, replace the following
parts in order and recheck.
1 Buttonhole sensor.
2 Printed circuit board K.
3 Printed circuit board A.
When the check is completed, LCD shows (SELF – CHECK END).
If the machine works properly, LCD shows (SELF – CHECK OK).
If not , LCD shows ( ERROR O ) then it shows the part to be replaced by the following letters:
A – Printed circuit board A
B – Buttonhole sensor
C – Foot control
D – Driving motor
K – Printed circuit board K
L – Light bulb
P – Upper shaft sensor
R – Machine socket
X – Stepping motor for ZZ
Y – Stepping motor for feed