Specifications

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BOSS ARC 140VRD、160VRD Operating Manual
9.0 BASIC TROUBLESHOOTING
WARNING
There are extremely dangerous voltages and power levels present inside this product.
Do not attempt to open or repair unless you are an accredited BOSS service agent and
you have had training in power measurements and troubleshooting techniques.
If major complex subassemblies are faulty, then the welding power source must be returned to an
accredited BOSS service agent for repair.
The basic level of troubleshooting is that which can be performed without special equipment or
knowledge.
9.01 Check the item and excrescent phenomenon exclusion method
Troubleshooting Guide
Fault Cause Remedy
1. The AC power indicator light is
not lit and welding arc can not
be established.
1. No power input or main power
switches damage.
2. Primary fuse is blown.
3. Indicator damage.
4. Relay PCB damage (for ARC
160VRD).
5. Indicator light is open circuit.
1. Check input power or replace
main power switch.
2. Replace primary fuse.
3. Replace indicator light.
4. Replace relay PCB.
5. Replace indicator light.
2. The AC power indicator light on
and welding arc can not be
established.
1. Input voltage unstable.
2. Diode PCB damage.
1. Connect stabilizer or reset power
switch.
2. Replace diode PCB.
3. The warning indicator light on.
1. Over load.
2. MOSFET damage.
1. Reduce current or wait moment.
2. Replace MOSFET.
4. MMA (STICK) mode no circuit
output.
1. Function switch select to the MMA
mode position.
2. Relay PCB damage.
3. MOSFET damage.
1. Select to MMA mode.
2. Replace relay PCB.
3. Replace MOSFET.
5. MMA (STICK) mode unstable
welding arc.
1. Power PCB damage.
2. Diode PCB damage.
3. Control PCB damage.
1. Replace power PCB.
2. Replace diode PCB.
3. Replace control PCB.
6. Fan does not run.
1. Power PCB damage.
2. Fan motor damage.
3. Relay PCB damage.
1. Replace power PCB.
2. Replace fan motor.
3. Replace relay PCB.
Table 14