Mondolfo Ferro MT 2450, Техническое и сервисное руководство

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20 Technical service manual
TROUBLESHOOTING
The balancing machine features autotest and autodiagnostics programs which provide in-
formation about most possible failures and the relative corrective measures (refer to the
list of error messages and the “Troubleshooting” section in the operator’s manual).
However, there are malfunctions which the machine is not able to recognise; a list of
them is provided below.
WARNING
For all electrical malfunctions, before replacing a circuit board the following should
always be checked:
- that the power supply is connected to the transformer primary correctly for the mains
voltage available.
- that the voltages of the transformer secondaries are at the specified rated values (use
a tester set as AC voltmeter and refer to the drawing of the transformer enclosed);
- that the wiring between the components probably involved in the malfunction is un-
damaged. In particular, check:
• that the connectors are fitted correctly;
• that the contacts are fixed correctly to the ends of the individual wires of the cables;
• that the mains voltage in the zone where the machine is installed is stable and that
the workshop’s earth connection system is in good working order;
• that the protective fuses on the transformer and on the power supply circuit board
have not blown, and that the LEDs on the power supply board which indicate that
the various power supply voltages are available illuminate.
The following is a summarising table, with reference to the general electrical wiring
diagram.
THE MACHINE DOES NOT SWITCH ON
Use a voltmeter to check that the power supply voltage is reaching the terminal board
of the transformer primaries.
1) If the voltage is not present on the primaries, check:
- that the power supply socket and the relative protective fuses are in good order;
- that the plug is correctly connected to the machine’s power cord;
- that the mains power cord is undamaged;
- that the master switch is operating correctly.
2) If the voltage is present on the primaries check:
- that the transformer fuses have not blown;
- that the specified voltages are present on the transformer secondaries;
- that the power supply and PEAC control circuit board is working correctly, checking
that the fuses on the board have not blown and that the relative indicator LEDs illu-
minate;
- that the motherboard power supply cable is wired correctly and its connectors are
connected correctly;
- for short-circuits on the peripherals. To do this, disconnect all the cables from the
motherboard connectors except for the power supply cable and try to switch on the
machine;
If the checks listed above do not reveal faulty components, replace the motherboard.