22
MODEL 520
CORRECT RESULTS
* Beep sounds when the buttons are
pressed.
* Led displays " 8.8", and blinks in 1-
sec. Intervals.
7- segment led displays "Ld" 3 mode
leds blink in 1-sec. Intervals.
* Led indicates "--".
* Button number is displayed when the
button is pressed.
* Led indicates "II".
(At left position)
(At right position)
STEP AND
ITEMS TO
CHECK
01)
7-segment
led
02)
Mode led
03)
Switch
04)
Bobbin
winder
switch
05)
Not
applicable
to this
model
PROCEDURE
Turn on the power switch while
simultaneously pressing the #01
button and the #16 button.
Press the #16 button five times to
select menu item "6".
Press the #01 button: The led
indicates "01" for one second.
If you don't press the #16 button
within 2.5 seconds, the machine
automatically reverts to normal
sewing mode.
Press #01 button, led
displays "02" for one second.
Press #01 button, led
displays "03" for one second.
Press buttons S1 to S3.
Press #01 button, led
displays "04" for one second.
*Move the bobbin winder spindle to
the right.
* Return it to the left.
Skip this step by pressing the #01
button.
DEFECTIVE RESULTS
* No beep sound.
* Does not enter self-diag-
nostic mode.
* Led does not blink on or
off.
1. Replace board "A".
* Led does not blink.
1.Replace board "A".
* Led display is different
from that shown to the
left.
1.Replace board "A".
* Led display is different
from that shown to the left.
1.Adjust bobbin winder
switch position.
2.Replace bobbin winder
switch.
3.Replace board "A".
LED
SELF DIAGNOSTIC SHEET
Button
S1 S2 S3
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