24
MODEL 520
STEP
09)
Slide
volume
10)
Foot
controller
11)
Zigzag width
motor
Feed
motor
OPERATION
Press #01 button,
led displays "09" for one
second.
Slide the speed control lever
from the left to the right, then
return it to the left.
Press #01 button,
the led displays "10" for one
second.
Depress the foot controller
down
all the way and release.
Press the #01 button, the led
displays "11" for one second.
* Press the #16 button.
Turn the handwheel toward you
to lower the needle to its lowest
position, then press #16 button.
CORRECT CONDITION
When the speed control lever is at the
left, led displays "00".
The indicated value
(hexadecimal) increases as you move
the speed control lever to the right,
and finally it shows "FF" when the le-
ver reaches the right-most position.
When the foot control
is not depressed, led
should display "F0"
to "FF" (hexadecimal
value).
When the foot control
is fully depressed, led
should display "05"
to "2F".
When the control is
disconnected, led
should show "00"
to "04".
* Led displays "bs".
Zigzag width motor is set to the initial
position. (Needle centered)
* Led displays
Feed motor is set to the initial position.
(Stitch length : 0)
DEFECTIVE CONDITION
* Led display is different from
that shown to the left.
1. Replace slide volume.
2. Replace board "A".
* Led display is different from
that shown to the left.
1. Replace foot control.
2. Replace machine socket.
3. Replace board "A".
* Led display is different from
that shown to the left.
If led displays "E1", width
motor or board "A".
* Led display is different from
that shown to the left.
If led displays "E2", replace
motor or board "A".
