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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been withdrawn from the mains supply.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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