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TROUBLESHOOTING
Caution: Only the qualified technicians are authorized to undertake the
repair task of this welding equipment in case of machine fault.
Fault Symptoms
While this welding equipment
is operated, the pilot lamp is
off, no output, built-in fan
unavailable.
While this welding equipment
is operated, pilot lamp is off,
no output, the built-in fan
unavailable. A sudden
shutdown of the welding of
the welding equipment
occurs.
While this welding equipment
is operated, pilot lamp is off,
no output, however built-in
fan is functioning.
While this welding equipment
is operated, pilot lamp is on,
however no output.
Diagnosis
1. Possible failure of input
voltage.
2. Possible failure of input
power supply.
3. This welding equipment is
possibly defective or
damaged.
1. The connection of power
supply switch and bottom
board is unavailable,
2. This welding equipment is
in protection state due to
over-voltage on input
supply.
3. Power supply input is
unstable.
4. This welding equipment is
in over-voltage protection
state due to continuous
power on and power off of
the welding equipment.
5. Relay of 24V of power
board is possibly defective.
Replace it.
6. Power supply failure to of
top PCB.
1. Faulty Connection inside
the welding equipment.
2. Faulty control module,
drive circuit or drive
module.
3. Check MOSFET,
transformers, diode of
rectifier and connections.
1. The welding equipment is
in over heating protection
state,
2. This welding equipment is
in over current input
protection state.
3. Possible function failure of
inverter unit. Disconnect
the power supply cable
from the centre PCB.
3.1 If the fault indicator is
on, MOSFET of top PCB
is possibly defective.
3.2 if fault indicator is off:
3.2.1 Possible damage
of transformer of
centre PCB.
3.2.2 Possible damage
of secondary rectifier
of transformer.
4. Possible damage of feed
back circuit.
Corrective Action
1. Check and rectify.
2. Check mains fuse and replace if
necessary.
3. Contact qualified repairer.
1. Rectify the connection failure.
2. Disconnect from mains supply and
check input voltage using a digital
multi-meter.
3. Have power supply checked by a
competent person.
4. Disconnect the power supply, for at
least 5 minutes, reconnect & restart
the equipment.
5. Check and replace if necessary.
6. Check and repair if necessary.
1. Check and reconnect.
2. Replace as necessary.
3. Repair or Replace as necessary.
1. Leave switched on and allows
cooling for several minutes,
re-trying.
2. Have checked by a trained service
technician.
3. 3.2 Replace it, if necessary.
3.2.1 Replace it if necessary.
3.2.2 Replace it if necessary.
11
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