6-5. Troubleshooting Power Source
Is input power connected to correct line voltage?
Yes
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| Momentarily press torch | |
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| trigger and listen for gas/air | |
No | Connect unit to proper input | Is compressor | No | valve operation. Check for | |
Postflow air at torch. Check | |||||
voltage. (see Section | |||||
| operating? |
| Control board PC1, air filter, | ||
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| and gas/air connections to | |
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| PC1 and torch. | |
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| Yes |
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Is Power switch in the On position?
Yes
No | Place Power switch in the | |
On position. (see Section | ||
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Does pilot arc ignite?
Yes
Press torch trigger and check if pilot arc ignites.
No Check torch consumables. 
*Check torch connections, relay CR1, gas/air system, and torch.
Is the cooling fan running?
Yes
| * | |
No | Check Power switch S1, | |
relay CR2, and thermistor | ||
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| R1. | |
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Does pilot arc
transfer to workpiece?
Yes
Place torch near workpiece and check if pilot arc “jumps” No or transfers to workpiece.
Check work clamp connec- tion. *Check Control board PC1 and connections, and torch and its connections.
Is Power light On?
Yes
Is Trouble light On?
No
No
Yes
*
Reset Power switch S1 and 
verify line power voltage.
Check relay CR2, thermistor R1, and Control board PC1.
Check torch consumables. Reset Power switch S1. If unit is overheated, wait 
while fan cools down unit
temperature.
Check all connections, Check main transformer T1, Check inductor L1. Return to beginning of chart.
*Servicing procedure to be performed only by authorized Service Station.
