Bernina 1230 Service Manual
BERNINA
Service
manual
1230
(Supplement
to
service
manual
1130/20)
*
FRITZ
GEGAUF
LTD.
Manufacturers
of
BERNINA
Sewing-Machines
8266
Steckborn
Switzerland
88/10
GB
006
807
50
02
Impressum
Authers:
P.
Kenyon
T.
Kalberer
Graphics:
F.
Rapold
Typeset
and
printed:
by
Bodan
AG,
Kreuzlingen
2
1230
Contents
Page
Technical
data
5
Description
of
Print
L-4200
6
Print
A-1230
6
Print
S-1230
6
Block
schematic
model
1230
7
Plug
connections
8
Print
A-1230
9
Print
S-1230
10
Print
L-4200
11
Diagnosing
instructions
12
Test
adapter
L-4200
13
Power
supply
-
4200
14
Test
panel -1230
15
Test
programme
with
service-panel
16
Warning
against
dangerous
voltages
17
Starting
the
service
programme
17
Ending
the
service
programme
17
Diagnosis
18+19
Test
A
L-4200
20
B
Print
L-4200/R-4200
(Drive
signal)
21
C
Connection
S-1
230/L-4200
22
D
Mains
cord
(cord
reel)
23
E
Connection
of
print
S-1
230/foot
control
unit
24
F
Print P-4200
25
G
Complete
light
holder
26
Hi
Step
motors:
27
o
PrintS-1230
o
Hall-sensors
H2
0
Position
Hall-sensorS.L.
28
o
Position
Hall-sensor
S.B.
I
Step
motors
pinning
position
29
K
Foot
control
unit
30
L
Foot
control
digital/analog
31
M
Print
A-1230
32
Print S-1230
Print
L-4200
N
Ret-button
33
0
Equalization
of
the
forward/reverse
feed
34
P1,2
Buttonhole
35+36
Q
Sewing-off:
37
o
Stitch
length
o
Stitch
width
o
Needle
position
L.C.R.
o
Long
stitch
Function
test
38
+
39
1230
3
Important:
A
comparison
ot
the
models
1230
and
1130
is
not
made
as
from
a
technical
point
of
view.
They
are
identical.
All
gauges,
instruments,
adjustments
etc,
which
are
applicable
to
model
1130
are
also
valid
here.
BERNINA
has
only
changed
the
test
programme
which
also simplifies
things
for
you.
These
instructions
are
to
be used
in
conjunction with
the
service
manual
cl.
1130.
This
manual
remains
the
property
of
our
company,
repro-
duction,
publication
or information
to
a
third
party
without
our
written
approval
is
forbidden.
FRITZ
GEGAUF
LTD.,
Manufacturers
of
BERNINA
Sewing-Machines
Steckborn
(TG)
Switzerland
4
1230
Technical
data
BERNINA
model
1230
Stitch
lenght
max.
forward
5 mm
Automatic
long
stitch
10
mm/2:1
max.
reverse
5 mm
Basting
device
30mm/6:1
Increment
0-1
0,05mm
Working
space
105x195mm
1-3
0,1
mm
Overall
length
375mm
3-5
0,2
mm
Overallwidth
184mm
Max.
stitch
width
5,5
mm
Overall
heigth
350
mm
Increment
0,1
mm
Motor
90
W
Needle
system
130/705
H
No
of
stitches
per/min.
min.-max.
120-1050/min
Adjusting
needle
130/705
H/TCN
reduced
min.-max.
120-600/min
Hook
system
BERNINA
CB
=
Central
bobbin
Sewing
light:
bulb
2x6
V/4
W
Lowest
point
of
needle
bar
=
0
degree
Weight
10,5kg
Presser
foot
height = 7,5
mm
Darning
foot
heigth
=
0,5
mm
Features
and
functions
Needle
position
5
Stitch
pattern
extended,
stitch
density
Light
beam
remains
constant
Zig-zag
and
stitch
lenght
(freely
adjustable)
2
needle
limiter
Automatic
basis
adjustments
Memory
Basic
marking
Blinker
7
practical
stitches
without
reverse
motion
LED
display
for
presser
foot
5
practical
stitches
with
reverse
motion
Upper
needle
stop
(general)
12
decorative
stitches
with
reverse
motion
Lower
needle
stop
(general)
32
number
of
stitch
patterns
Needle
positioning
upper/lower
with
foot
pedal
LED
control
for
programmed
pattern
Permanent
reverse
sewing
Manual
stitch
size
adjustment,
memorized
Pattern
start
Main
switch
Fully
automatic
buttenhole
Separate
light
switch
Buttonhole
3
step
Speed
control
using
the
foot
control
Keyhole
buttonhole
Letters
A
to
Z
Automatic
long
stitch
Numbers
0
to
9
Basting
device
Characters
4
(-
-
o
?)
Balance
for
forward
and
reverse
feed
Memory
capacity
50
units
(can
be
called
up
even
Clear
switch
after
mains
failure/interruption)
Single
pattern
Mirror
image
1230
5
Description
The
electronics
of
the
model
1230
sewing
S-1230
control
print
machine
is
essentially
located
on
three
large
The
complete
sewing
machine
control
is
located
printed
circuit
boards;
the
power
print
L-4200,
the
on
the
S-1230
control
print.
The
S-1
230
control
control
print
S-1230
and
the
display
print
A-1
230
print
is
located
on
the
A-1
230
print
from
the
rear.
(compare
to
the
block
schematic
diagram).
The
The
most
important
control
elements
are
the
tasks
of
the
3
units
correspond
to
the
known
microcomputer,
and
the
power
drive
for
the
step
functions
of
L-4200,
S-4200
and
A-4200
prints
motors.
A
new
feature
over
model
1130
is
that
the
from
the
model
1130.
bobbin
winder
motor
is
also
controlled
by
the
microprocessor.
The
bobbin winder
motor
speed
1-4200
powerprint
can
now
be
controlled
from
the
foot
control.
The
L-4200
power
print
is
mounted
above
the
The
S220
service
switch
on
print
S-1
230
is a
motor
on
the
rear
side
of
sewing
machine.
The
service
aid.
This
switch
has
two
positions:
normal
circuit
components
on
the
L-4200
have
the
follow-
sewing
operation,
and
service
position.
In
the
ing
functions:
service
position,
several
buttons
and
diodes
on
-the
display
panel
are
assigned
other
functions.
- Motor
control:
This
allows
the
service
technician
to
execute
The
main
motor
control
operates
with
the
mains
necessary
adjustment
and
testing
functions
using
voltage.
The
main
motor
is
a
DC
motor
with
the
display
panel (refer
to
the
special
section
pulse-width
modulated
speed
control.
The
service
programme).
The
service
switch
must
closed
loop
control
circuit
on the
small
R-4200
always
be
set
into
the
sewing
position
for
normal
print
is
located
on
the
power
print.
sewing
operations.
All
circuit
components
for
the
motor
control
The
microcomputer
on
print
S-1
230
receives
an
operate
at dangerous
voltage
levels,
analog
signal
from
the
foot
control,
which it
then
The
safety
regulations
must
be
adhered
to.
converts
into
a
digital
signal
and
transmits
to
print
R-4200
as
setpoint
for
the
motor
speed.
The
-
Power
supply:
R-4200
print
controls
the
motor
speed
to
the
Generates
the
following
D.C.
voltages:
speed
specified
by
the
S-print,
using
a
setpoint
-
-
30V
for
the
step
motors
actual
value
comparison.
When
the
foot
control
is
-
5V
for
the
logic
circuitry
on
the
S-1
230
and
released,
the
setpoint
goes
to
zero,
the
brake
is
A-1230
prints
actuated
from
the
microcomputer
on
the
S-print
-
6V
for
the
sewing
light
via
the
R-4200
print,
and
the
motor
is
rapidly
-
30V
for
the
bobbin
winder
motor
braked.
Components
are
protected
from
overload,
in
Signal
transfer
between
the
S-1230
and
R-4200
the
case
of
faults,
by
three
fuses
F
150,
F
151
print
is
realised
using
a
4-pole
cable.
Signal
and
F
152. If
a
fuse
blows
only
original
replace-
transfer
is
realised
through
an
opto-coupler
ment fuses,
with
the
correct
rating
may
be
used.
providing
electrical
isolation
and
thus
eliminating
dangerous
voltage
levels
from
the
foot
control
A-1230
display
print
and
the
S-1230
control
print.
The
display
section
is
mounted
directly
behind
the
The
step
motors
are
in
random
positions
when
operating
control
panel.
The
display
and
ope-
sewing
machine
is
switched
on.
Random
values
rating
control
elements
are
soldered
onto
the
L-
can
also
be
in
the
microcomputer
control
shaped
printed
circuit.
memory.
In
order
to
have
a
defined
state, the
step
A
time
multiplex
control
allows
the
numerous
motors
are
rotated
into
their
calibrated
position
LEDs
and
control
elements
to
be
connected
to
the
by
a
microcomputer
command,
and
the
position
open
loop
control
on
the
S-1
230
control
print
value
is
set
to
zero
in
the
microcomputer
memory.
using
only
16
connection
lines.
This
starting
state
allows
the
selection
and
sewing
of
any
stitch
programme.
6
1230
Model
1230
block
schematic
L4200
F150
A
1230
A1230
RECTIFIER
J
FOOT
CONTROL
£
BUTTON
HOLE
SENSOR
S
REVERSE
SWITCH
D
-MAGNET
BASTING
DEVICE
0
(
POSITION
INDICATOR
S4
WIDH
OBBINWINDER
ROTARY
ENCODE
STITCH
WIGTHT
ROTAR
ENCOE
ZUSERVICE
PROGRAMME
ROITAY
LENCOD
STITCH
WIDTH
STITCH
LENGTH
STEP
MOTORS
1230
7
0
I
Brake
P250
P
200
C
2
+!
5V
S
2
-2
S
E1"C4
3
Drive
green
2
2OX
4
Nominal
Vau
4re
-L
2~ig~
S
gr
me1
Sewing
light
44
2o
CL
S .
L .
5'
5
--
5
4
up
2
Step
motor
8
1
7__C_
4
S.B,
P
251
P2
+
5V
Mains
0
V
Hall-Sensor
1
3
S.L.
Housing
22
+5V
2
3
L
H
ll-Sensor
V,
M
ain m o r
4
4
n
osition
-S.B.
M
M
5
o
+
r
Magnet
7
6
-
asting
device
78
.8
t
+'=
A-
O1230
A13
S-1230t"o303K+1s
0
2
-0
CL
200
L-L20
5
SB
a13
St123
13
K-1130
1C4
3
red
+3
Bobwiwinder
0 30
R
4
ED
Rt
110
K- 13
5
R-Button
•
•
•
•
Print
A-1230
Utility
stitch
display
Needle
positions
Bar
graph
stitch
width
and
switches
Presser
foot
display
Buttonhole
display
Bar
graph
stitch
length
1230
9
S-1230
Print
Data
lines
to
print
A-1230
Potentiometer
for
adjusting
buttonhole
sensor
A
Potentiometer
for
adjusting
buttonhole
sensor
B
Foot
control
2-pole
black
Control
signals
from/to
L-print
4-pole
green
Buttonhole
sensors
Reverse
switch
6-pole
black
L-
Stitch
length
sensor,
3-pole
red
Stitch
width
sensor,
3-pole
black
Position
indicator
5-pole
black
Power
supply
from
L-print
5-pole
red
Magnet
basting
device,
2-pole
green
Service
switch
Pos.
Service
I
Pos.
Normal
Bobbin
winder
motor
4-pole
blue
Stitch
length
step
motor
4-pole
red
Stitch
width
step
motor
4-pole
black
Warning!
If
print
S-1230
has
to
be
replaced,
then
buttonhole
adjustment
and
forward/reverse
feed
equalization
must
be
carried
out.
10
1230
Print
L-4200
Important!
Never
fit
heat
sink
and
securing
screws
without
insulating
foil
or
insulating
washer,
because
a
short
circuit
will
occur.
The
heat
sink
with
its
Galvanically
insulating
foil
must
sit
fully
on
the
fixing
angle,
in
separated
order
to
achieve
best
results
in
transfering
heat
low
voltage
from
the
heat
sink
to
the
sewing
machine housing.
4-
Not
used
P157
P160
4
[
1
45V
41
I
Power
supply
for
P159
1-
print
S
and
A-4200
1Control
signals
to
print S-4200
Sewing
light
Equalization
of
speed
Connector
for
print
R-4200
Main
motor
Circuits
in
this
area
operate
at
dangerous
voltages.
Observe
the
F
Main
notice
on
page
17.
Mains
123011
Diagnostic
instructions
-
As
opposed
to
model
1130,
model
1230
is
equipped
with
a
service
programme.
The
service
programme
is
essen-
tially
designed
for
test
and
adjustment
tasks.
-
The
diagnostic
instructions
should
be
adhered
to
for
repair
work.
Reference
should
be
made
to
the
service
programme
for
adjustment
and
equalization
tasks.
Warning
of
dangerous
voltage
levels
Mains
voltage
(refer
to
print
L-4200)
Circuit
components
on
the
L-4200
power
print,
the
main
motor
and
the
cable
drum,
carry
dangerous
voltage
levels.
For
your
own
safety,
print
L-4200
should
only
be
touched
after
about
30
seconds
after
the
mains
voltage
has
been
switched
off,
which
is
the
time
required
by
the
capacitors
to
discharge after
the
mains
plug
has
been
removed.
Warning:
The
sewing
machine
may
only
be
connected
to
the
mains
supply
when
the chassis
cover
or
the
auxiliary
cover
is
mounted.
Work
may
only
be
carried
out
on
the
L-4200
print,
main
motor
and
cable
drum
when
the
mains
plug
has
been
withdrawn
from
the
mains
supply.
Electrically
isolated
low
voltages
(refer
to
print
L-4200)
Several
circuit
components
on
the
L-4200
print
operate
with
electrically
isolated
low
voltages
(40
V
or
less).
With
the
exception
of
the
power
print
L-4200,
the
main
motor
and
the
cable
drum,
the
other
modules
also
operate
with
elec-
trically
isolated
low
voltages!
There
is
no
danger
involved
in
touching
these
components
during
operation.
Warning!
The
following
should
be
additionally
observed
when
carrying
out
repair
and
adjustment
work:
-
Changing
from
the
service
programme
to
normal
operation,
and
vice
versa
is
only
possible
after
changing
the
position
of
the
service
switch
on
the
S-1230
print,
and
briefly
switching
off
the
mains
voltage.
-
The
following
adjustments
should
be
made
each time
a
S-1230
print
is
replaced:
Forward/reverse
feed:
test
programme
0
Buttonholer:
test
programme
P
-
Switch
off
the
mains
voltage
before
touching
and
replacing
the
R-print.
12
1230
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