CEBORA S.p.A. 5
3.302.140 21/05/03
Correct?
3 - MAINTENANCE
WARNINGS
ANY INTERNAL INSPECTIONS OR REPAIRS MUST BE CARRIED OUT BY QUALIFIED
PERSONNEL.
BEFORE BEGINNING MAINTENANCE OPERATIONS, UNPLUG THE MACHINE FROM
THE MAINS.
3.1 - Periodic inspection, cleaning.
Periodically remove dirt and dust from the internal parts of the power source, using a jet of
low-pressure dry compressed air or a brush.
Check the condition of the power supply and torch cables of the power source; replace if
damaged.
Check the condition of the internal power connections and connectors on the electronic board;
if you find “loose” connections, tighten or replace the connectors.
3.2 - Troubleshooting.
NOTE
Items in boldface describe problems that may occur on the machine (symptoms).
q Operations preceded by this symbol refer to situations the operator must determine (causes).
♦ Operations preceded by this symbol refer to actions the operator must perform in order to
solve the problems (solutions).
3.2.1 - The power source does not start, lamp in the switch (A) (14) off.
MAINS SUITABILITY TEST.
q No voltage for mains protection.
NO
YES
♦ Eliminate any short-circuits or insulation leakages toward ground on the
connections between power cable, switch (14), selectors (15), transformer (46),
control board (41) terminals B1 and B2, and output contactor (50).
♦ Check the condition of the windings of transformer (46), especially making sure
that there are no signs of overheating or dents in the winding that may lead to
partial short-circuits in the turns. If necessary, replace the transformer (46).
♦ Check the efficiency of the rectifier bridge (38), especially that there are no diodes
in short-circuit.
♦ Mains not suitable to power the power source (ex.: insufficient installed power).
♦ Make sure there are no interruptions in the power supply cable.
♦ Check the efficiency of the switch (14) and thermostat (47).
♦ Replace switch (14) (lamp burned-out).
M12179B, MB120A, WFW12179, 117-092, 83-363 (Mig 110)
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