16
The power indicator does
not illuminate;
the fan does not work;
no welding output.
a. Check if the connecting wires on PCBs are reliably connected.
b. Open circuit or poor contact problems exit at the joints of output terminals.
Notes:
[
4
]
The center PCB for ARC140
269 is PD-47, and the top PCB for ARC200
276 is PD-53.
(Z
)
(Z
)
a. Make sure that the mains voltage is normal.
b. Make sure that the input cable is reliably connected to the power switch, and
that the power switch can be switched on or off normally.
c. Check whether any of the silicon bridge, IGBT or rectifier diode are damaged,
and whether the gate resistor is burned out. Replace them if necessary.
d. Power it on, and switch the digital multimeter to DC V. Check if there is 310V
DC at both terminals of the DC bus
on the top PCB
If there is,
replace the top PCB. Otherwise, replace the bottom PCB
[
1
]
[
2
]
.
[
3
]
.
a. Make sure that the mains voltage is normal.
b. Check if the connecting wires on the control PCB are reliably connected.
c. Check if the current adjustment potentiometer is damaged, and replace it if
necessary.
d. Replace the control PCB
→
rectifier PCB.
c. The protection indicator illuminates: Pull out the thermal switch, and check if
the protection indicator still illuminates. If so, replace the control PCB.
Otherwise,the machine is under overheating protection. In this condition, it is
unnecessary to pull out the power plug, and it will recover automatically after
5~10 minutes when the machine is cooled down.
d. The protection indicator does not illuminate and there is no output
:
Pull out
the thermal switch, and check if there is no-load voltage. If there is, the thermal
switch is damaged. Otherwise, connect the metal part of 7815 with the black
probe and connect the metal part of IRF9Z24 or IRFZ24 with the red probe,
the check if the voltage is about 8.4V. If it is, replace the center PCB
Otherwise, replace the top PCB.
[
4
]
.
Table 5-2 Troubleshooting for ARC140
269
RC200
276
:
(Z
)/A
(Z
)
Malfunction Phenomena
Cause and Solution
the output current is unstable
or cannot be controlled by
potentiometer when welding.
The fan works;
the power indicator is normal;
The fan works;
no welding output.
The electrode holder becomes
very hot.
a. The rated current of the electrode holder is smaller than its actual working current.
Replace it with a bigger rated current.
b. Check if the screw or wire of the electrode holder is reliably connected.
Excessive spatter in MMA
welding.
The output polarity connection is incorrect. Exchange the polarity.
[
1
]
The DC bus for ARC140 (Z269) is P8, and the DC bus for ARC200 (Z276) is P9.
[
2
]
The top PCB for ARC140 (Z269) is PM-48, and the top PCB for ARC200
(
276
)
is PM-47.
Z
[
3
]
The bottom PCB for ARC140 (Z269) is PZ-75, and the top PCB for ARC200 (Z276) is PZ-86.
5. TROUBLESHOOTING
Содержание Arc 140
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