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12. MAINTENANCE AND TROUBLESHOOTING (continued)
12.1 Carrying out Maintenance on the Welding Power Source
Periodically check the welding power source to ensure the safety of the equipment and the
efficiency of work.
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Check the following daily:
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No strange vibration, buzzing noise, and smell are generated from the welding power source.
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No excessive heat is generated from the cable connections.
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Fan functions properly when the power switch is turned on.
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The switches properly function.
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Connection and insulation of cables are surely made.
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There is no break in cables.
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Fluctuation of power source voltage is not large.
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Case Earth is surely connected. (Disconnection of the Case Earth may result in failure or
malfunction of the equipment.)
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There is no trouble in crack and the like on the front panel.
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Check the following each three to six months:
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There is no damage inside the torch.
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There are no loose connections or no poor contacts caused from rust, on input side of the
welding power source and output side of the cables.
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There is no trouble with insulation.
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The welding power source is properly grounded.
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Built-up dust on the transistor or the cold plate on the rectifier may affect the equipments.
Take off the cover of the welding power source once a half year, then remove dust by
blowing moisture-free compressed air on each part.
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The dust protective filter located on the inlet of the fan does not clog, which may result in
damage to the welding power source. Be sure to inspect it periodically.
12.2 Precaution for Replacement of the Printed Circuit Board
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Make sure that the connector number inscribed on the
printed circuit board matches the number marked on the
connector.
٨
Turn off the control power switch and line disconnect
switch before carrying out maintenance on the welding
power source, and wait three minutes until the capacitors
inside the welding power source discharge.
٨
This welding power source uses a high-frequency
inverter system, be careful of accidental connection of
the line disconnect switch at input side.
٨
Surely connect the connectors until the connector clicks. Failure to do so may result in damage
to the printed circuit board and to the machine.
٨
With the connectors disconnected, do not turn on the power switch on the front panel.
٨
Do not use organic solvent such as thinner, trichloroethylene, gasoline, etc., to clean the plastic
cover and carrying handle of the welding machine. Deformation and flaw may result from the
adherence of the organic solvent.
NOTE: Match the number on the printed
circuit board with that on the connector.
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