Adjustment Of Electronic Circuit Board; Maintenance; Possible Problems And Remedies - CEA SMARTMIG T25 Manual De Instrucciones

• Connect the clamp of the ground lead to the piece to be welded (see
Fig. F).
• The welding machine is ready for welding.
• To begin welding, approach the point to be welded and press the but-
ton on the torch.
• When you have finished welding, remove the waste, turn off the ma-
chine and close the gas cylinder.
CONTINUOUS WELDING
Select the most suitable wire tension adjustment and speed, using the
respective controls, in function of the type of work to be carried out.
Press the torch button to start the welding current and advancement of
the wire and perform welding. After completely the weld, release the
torch button to stop the wire advancement motor immediately. The gen-
erator is powered for a few seconds, long enough to burn the excess
wire emerging from the torch. The gas solenoid remains open to provide
for maintaining an inert atmosphere around the welding zone. This func-
tion is called "burn-back" and is adjustable. The control circuit is pow-
ered, ready for the next welding cycle.
SPOT WELDING
This type of welding is recommended for repairs in automobile body
shops.
• Replace the gas-guide nozzle with the
special type for spot welding (see Fig.
G)
• Set the spot welding time with the
potentiometer (Pos. 2, Fig. D)
• Select the most suitable tension and
speed adjustment, using the respective controls, in function of the
type of work to do.
• Press the gas-guide nozzle perpendicular to the part to be welded.
• Press the torch button to start the welding current and advancement
of the wire.
• At the end of the set spot welding time, the wire stops advancing
automatically.
• Pressing the torch button again begins a new welding cycle.
• Release the torch button.

Adjustment of electronic circuit board

Trimmer RT1: Burn-Back
Trimmer RT2: Motor ramp
NOTE: Trimmers can be adjusted from the outside by simply removing
the mobile part of the cover, without having to open up the welder.
BURN-BACK
MIN
RT1
MIN
V
FIG. H
FIG. G
MAX
MAX
RAMP
RT2
t

Maintenance

IMPORTANT: Any eventual maintenance must be carried out by
expert, qualified personnel. The guarantee is invalidated if the fi-
nal user attempts to repair any damage done to the machine by
himself.
WARNING: Before carrying out any inspection of the inside of the gen-
erator, disconnect the system from the supply.
GENERATOR
The maintenance of this equipment is limited to the cleaning of the in-
side of the frame and periodic inspection of worn cables or loose con-
nections. At regular intervals disconnect the welder from the mains, take
off the cover and use dry compressed air to remove possible accumula-
tions of dirt and dust. During this operation do not direct the jet of air
onto electronic components. Check, that the gas circuit is completely
free from impurities and that the connections are tight and that there are
no leaks. Carefully check that the electric valve does not leak. Check the
wire feeder rolls periodically and replace them when wear impairs the
regular flow of the wire (slipping etc).
TORCH
The torch is subjected to high temperatures and is also stressed by trac-
tion and torsion. We recommend not to twist the wire and not to use the
torch to pull the welder. As a result oftheabovethetorchwill requirefrequent
maintenance such as:
• cleaning welding splashes from the gas diffuser so that the gas flows
freely;
• substitution of the contact point when the hole is deformed;
• cleaning of the wire guide liner using trichloroethylene or specific sol-
vents;
• check of the insulation and connections of the power cable; the con-
nections must be in good electrical and mechanical condition.
REPLACEMENT OF THE ELECTRONIC CARD
WARNING: Static can damage the circuit boards!
• It is advisable to wear an "antistatic bracelet when working with the
circuit boards or their components.
Proceed as follows:
• Remove the fix cover of the welding machine.
• Extract the side connector for wiring up the circuit board.
• Release the card by turning the elastic holders counterclockwise by a
quarter of a turn.
• Remove the faulty card.
• Reverse the procedure to fit the new card.

Possible problems and remedies

The detection of eventual problems and their solution. The power supply
line is the major source of problems. In the event of a fault proceed as
follows:
1) Check the voltage of the supply;
2) Check the state of the line connection at the plug and the main switch;
3) Check that the main fuses are not burnt out or loose;
4) Check the following for defects:
• The switch and wall outlet that power the machine
• The plug and mains cable
• The welder switch
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