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TROUBLESHOOTING AND FAULT FINDING
I!'\ Notes: The following operations must be performed by qualified electricians with valid
\!/ certifications. Before maintenance.please contact with us for professional suggestion.
1. ARC250/275/300/315/ 400 fault symptom and remedy
Fault
symptom
A. Make sure power switch is close.
B. Make sure the electric wire net connecting to input cable is working alright
C. Heat-sense resistance(4 pieces) is broken.(24V relay has problem)
D. Power source board ( Bottom board has problem, no DC537V output
Power indicator is
voltage),
not lit, fan doesn't
a)
Silicon bridge circuit is broken, cable is loosen.
work, no welding
output.
b)
Part of board is burnt.
c)
Check cable between air switch and the power source board, power
board between MOS board.
E. Subsidiary power source on the control board has problem. (Contact with
dealer or manufacturer.)
A. Check if components are poor connects.
B. Check if connector of output terminal is break circuit and poor connect.
C. Inverter circuit may go wrong. please disconnect the power
the main transformer on MOS board (close to insert of fan VH-07) then
res ta rt the machine.
a) If abnormal indicator is still on ,some fieldistors on MOS board are
damaged ,find out and replace them with same model
Fan is working and
b) If abnormal indicator is off:
abnormal indicator
is lit. no welding
1)
Maybe transformer of middle board is damaged, measure primary
output.
inductance value and Q value of main transformer by inductance
bridge.
2)
Primary value is parallel circuit, L=1.2-2.0mH, Q>40
If inductance value and Q value is low, replace it.
3)
Maybe some of secondary rectifier tube of transformer is broken,
check and replace rectifier tube.
D.
Maybe feedback circuit is in fault.
Remedy
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