4 Warnings, precautions and general notices for performing repairs
2) WARNINGS, PRECAUTIONS AND GENERAL
NOTICES FOR PERFORMING REPAIRS
Repairs must be performed by qualified personnel only.
Before performing the repair, you should read and assimilate the
contents of this manual, in particular the safety precautions.
Avoid performing repairs without the presence of another person
able to provide help in the event of an accident.
The repair of a machine requires access to its internal parts and con-
sequently removal of some of the protective panels. Additional pre-
cautions are therefore necessary with respect to use of the machi-
ne for welding in order to prevent possible injury or damage cau-
sed by contact with
- live parts
- moving parts
- parts at high temperature
Live parts:
CAUTION ! When handling internal parts of the
machine, remember that opening of the switch does
not prevent the risk of electric shocks: the machine
must be unplugged from the power supply.
Wait approx. one minute before carrying out work on the
internal parts as the capacitors may be loaded at high voltage.
CAUTION ! When taking measurements, remem-
ber that the measuring instruments can be live and
you should therefore avoid touching their metal
parts.
CAUTION! When TIG operation is selected with HF
start, the machine generates a series of high volta-
ge impulses (approx. 10,000 V) to spark the wel-
ding arc. When an arc sparking test in TIG with HF dischar-
ge is not specifically scheduled in the diagnostic phase, you
are therefore advised to disconnect the terminals FN1 and
FN2 of the HF 15.14.286 board.
After carrying out the repair, remember to reconnect FN1
and FN2 of the board 15.14.286 before finally closing the
machine, then perform a few welding tests, including TIG HF
sparking.
Moving parts:
CAUTION ! Keep your hands well away from the
fan when the machine is connected to the power
supply. Ensure that the machine is unplugged and
that the fan is at a standstill before replacing it.
Parts at high temperature:
CAUTION ! When handling internal parts of the
machine, remember that some of them may be
very hot. In particular avoid contact with heat
sinks.
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