Fritz Gegauf 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

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

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
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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
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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
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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
• • • •
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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
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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
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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
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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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