２８
INITIAL TROUBLE DIAGNOSIS
Even if you have a trouble such as being unable to weld, unstable arc, bad welding result,
do not jump to the hasty conclusion that the welding machine is out of order. Even if the welding
machine has nothing wrong, the above-mentioned errors may occur because or something far from
a trouble, for example, blown or loosened fuse, unset or erroneously set switches, almost
disconnected cable, cracked gas hose.
Therefore, when you suspect the equipment of having a trouble, it is recommended for you to
check it prior to asking for a repair. It would solve not a few problems.
The following is an initial diagnosis list designed for general welding errors.
Find a relevant phenomenon among the error items in the upper right of the list, and
examine/check all the items marked with ○ in the blanks below that phenomenon.
For the fuses, the operation panel has a power fuse. and the printed circuit board has a motor
fuse and gas valve fuse, respectively.
[Welding Error Initial Diagnoses List]
Error
Block and check item
Switch box
(input protective
device)
Turning on the switch securely
Blown fuse
Loose connection
○ ○ ○ ○ ○ ○
Input cable
Cable being almost cut
Loose connection
Trace of overheat
○ ○ ○ ○ ○ ○
Switches on the welding
power
source
operation
panel
Turning on the POWER switch
Erroneous settings of "Wire
DIA.
"
"CRATER"
and
"gas
SUPPLY" selector switches
○ ○ ○ ○ ○ ○ ○
○
Welding power source
Internal fuses
Blown "power", "motor", and
"gas valve" fuses
○ ○ ○
○
Gas Bomb and gas
Regulator
Opening the main plug
Remaining amount of gas
Flow
rate(pressure)
set
value
loose connection
○
○
○
Gas hose (entire route from
the gas bomb to the welding
torch )
Loose connection
Damage or burnt hole in the gas
hose
○
○
FOR YOUR INFORMATION
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