Bernina 1090 - Diagnosing Instructions

Diagnostic instructions
— As opposed to model 1130, model 1090 is equipped with
‘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-1230)
Circuit components onthe L-1230 power prin, he main
motor and the cable drum, carry dangerous voltage levels.
For your own safety, print L-1230 should only be touched
after about 30 seconds after the mains voltage has been
switched off, which is the time required by the capacitors lo
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 ouxiliory cover is
mounted. Work may only be carried out on the L-1230
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been withdrawn from the mains supply.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-1230)
‘Several circuit components on the L-1230 print operate with
electrically isolated low voltages (40 V or less). With the
exception of the power print L-1230, the main motor and
the cable drum, ће other modules also operate with elec-
trically isolated low voltages!
There is по danger involved in touching these components
during operation.
Warning!
Thefollowing 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 ће position of he
service switch on the S-KAO print, ond briefly switching off the
mains voltage.
— The following adjustments should be made each time а 5-КАО
printis replaced:
Forward/reverse feed: Service programme 6
Setting min. and max. position: Service programme 3
= Switch off the mains voltage before touching and replacing the
Reprint.
12 юю