Bernina 1230 - Diagnostic Instructions; Voltage Warnings and Safety Precautions

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withdrawn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