161 MF— 161 MTM
Ultima modifica/Last Update: 18/03/2008 Rev0 pagina 11 di 17
PROBLEM
CASE
SOLUTION
The front panel does
not switch on.
The fan works but the front panel does
not go on.
Both the fan and the front panel do not
work.
!
Switch off the machine and disconnect the
plug. Make sure the flat cable that con-
nects the front panel to the power board is
inserted correctly. If correctly inserted, re-
place the front panel. If the front panel
does not go on, one of the switching power
supply unit outputs is broken. Therefore
the power board must be replaced.
!
Switch off the machine, disconnect the
plug and check the mosfet of the switching
power supply unit on the power board. IF
it’s damaged it must be replaced (picture
6).
The MMA/MIG/TIG out-
put voltage is about 11V
and the machine does
not weld.
The output voltage wiring of the front
panel is interrupted (picture 1).
The primary current alarm on the power
board is activated.
!
Switch off the machine and disconnect the
plug:
Make sure that the wiring contact is cor-
rectly inserted in the connector.
Check for continuity between the +/- out-
put outlets and that the 2-path connector
is connected to the front panel (picture
1);
!
The power board must be replaced.
The output voltage in
each procedure is about
11V and enabling of the
thermal protection de-
vice.
Wait a few minutes keeping the machine on
to favour cooling of the inverter. If the ma-
chine continues running with the protection
devices on, switch the machine off and dis-
connect the plug. Remove the hood and
make sure:
the temperature of the heat sink tool is
less than 40°C;
If it is less than 40°C, check whether the
thermal protective device contacts are
normally closed.
- If one of the protection devices is always
opened it is defective, it must be
accordingly replaced.
- If it is closed, make sure the two terminals
are well inserted in the connector(picture 1).
- Power board feed problems, it must be
accordingly replaced.
The output voltage is
zero.
Switch the machine off and disconnect the
plug. Check for a short circuit at the DINSE
plug with a diode tester. A short circuit may
be caused by :
damaged transil on the snubber board;
damaged diodes;
damaged inverter;
The inductive value of the Power Trans-
former is null.
Switch off the machine and disconnect the
plug. Remove the snubber board:
!
check with a diode tester the status of the
transil on the snubber board (picture 2);
!
check with a diode tester the status of the
diodes;
!
check the status of the power board
(picture 4);
!
The Power Transformer must be replace.
