Jasic Arc 140, Operator'S Manual

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17
Table 5-3: Troubleshooting for ARC200D 225 RC250D 226 RC250 227 (Z )/A
(
Z
)
/A
(
Z
)
The power indicator does
not illuminate;
the fan does not work;
no welding output.
The power indicator
illuminates;
the fan does not work;
no welding output.
the output current is unstable
or cannot be controlled by
potentiometer when welding.
the power indicator is
normal;
no welding output.
The 220V indicator illuminates
when connecting the machine
to AC 380V
(
only for Z225 and
Z226
)
Malfunction Phenomena Cause and Solution
The fan works;
The fan works;
Excessive spatter in MMA
welding.
a. Make sure that the power switch is closed.
b. Make sure that the input voltage is normal.
a. The wire connecting the power switch with the power PCB breaks is loosely
connected. Tighten it.
b. The 24V relay on the power PCB is damaged or not closed. Check the 24V power
supply and the relay. Replace the relay if necessary.
a. Check if the current adjustment potentiometer is damaged, and replace it if
necessary.
b. Check all joints
(
esp. connectors
)
for reliable connection.
a. The mains voltage is below AC 310V. Check if there is any high-power machine
working nearby, which leads to the low mains voltage.
b. Check if the chip for judging voltage switching IC5 on the top PCB is damaged,
and replace it if necessary.
a. Delay circuit is added for this machine to improve the reliability, so there is no
output within 5 seconds after the machine is powered on, while the fan and power
indicator appear normal. If there is still no output after 10 seconds or a longer time
after the machine is powered on, do the following checking.
b. Check if the connecting wires inside the machine are reliably connected.
c. Open circuit or poor contact problems exit at the joints of output terminals.
1
)
Themachine 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.
e. The protection indicator does not illuminate
:
Shut down the machine, and check
with a multimeter whether the two output terminals are short circuited. If so, check
if any of the diode or transformer on the center PCB is damaged or short circuited.
Replace them if necessary.
d. The overheating protection indicator illuminates:
2
)
Check if the thermal switch is damaged, and replace it if necessary.
The output polarity connection is incorrect. Exchange the polarity.
5. TROUBLESHOOTING