Bernina 1230 - Diagnosis Table

Fault
Possible
fault
on
Repair
instructions
Display
panel
and
sewing
light
-
L-4200
print
- Test
A,
resp.
M
not illuminated
- Mains
cable
- Test
D
Main
motor
not
running
Machine
(dead))
Main
motor
does
not rotate
other
- L-4200
print
- Test
A,
resp.
M
functions
OK
-
R-4200
print
- Replace
R-4200
print
after
switching
off mains
voltage
-
S-1230
print
- Replace
S-1230
print
- Foot
control
- Check
control,
replace
bobbin
winder
motor
foot
control,
if nec.
test
K, L
- Connection
between S-1
230 and
- Test C
L-4200
prints
- Connection
between
S-1
230
print
-
Test
E
and
foot
control
- Main
motor
- Check
motor
cable
and
plug
aReplace
motor
0
Bobbin
winder
motor
does
not
function,
-
S-1230
print
-
Replace
print
S-1230
other
functions
OK
- Bobbin
winder
- Replace
complete
bobbin
winder
Sewing
light
does
not
function
- Lamps
-
Replace
lamps
-
Lamp
holder
-
Test
G
-
Print L-4200
-
Test
A
Step
motors
do
not
position
-
Step
motor
print
S-1230
-
Test
Hi,
H2
- Connection
between
S-1230
and
L-4200
prints
-
Test
C
Front
panel
LED
does
not
illuminate,
Print
A-1
230
-
Replace
print
A-1230
however
selected
function
is
executed
when
button
depressed