MAX200 Instruction Manual 5-5
1-97
MAINTENANCE
Solution: Disconnect the PL26/REC26 connectors and connect an external 120 VAC power source to
REC26 connector pins. If a spark is observed across the spark gaps, replace control board
PCB7. If a spark is not observed across the gaps, remove capacitors C7 and C8. If a faint spark
is now observed across the gaps, replace T5 and reconnect the capacitors. If a spark is not
observed, replace C7 and C8.
(Always replace the capacitors in pairs).
Problem: The green POWER ON indicator is illtuminated, the torch switch is pressed and the DC
ON indicator illuminates, and there is high frequency, but there is no pilot arc.
Cause: There is no high frequency at the torch.
Solution: Check for a shorted torch, a damaged pilot arc lead, or loose lead connections.
Replace the torch or pilot arc lead or tighten the lead connections.
Cause: The pilot arc relay CR1 is defective.
Solution: Replace relay CR1.
Cause: Control board PCB7 is defective.
Solution: Replace board PCB7.
Problem: The unit shuts itself off after it is turned on.
Cause: The system has overheated
Solution: Wait for the unit to cool down.
Cause: There is insufficient air or gas pressure.
Solution: Check the gauge on the back panel. Increase the air or gas pressure to the unit.
Cause: Auxiliary switches on the safety contactor are loose.
Solution: Tighten the switches.
Problem: The unit is not cutting well.
Cause: The work clamp is not connected or it is broken.
Solution: Connect or repair the work clamp.
Cause: The torch is cracked.
Solution: Replace the torch.
Cause: The pilot arc relay CR1 is defective. Check for contacts that are welded shut
Solution: Replace relay CR1.
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