Bernina 1230 User 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
sizeadjustment, 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 (canbe
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 printfrom
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
isa
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