MAINTENANCE
powermax1650 Service Manual
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Resistance Check #3
• Troubleshoot illuminated Torch Stuck Open LED on control board PCB3.
1. Check resistance between Q15 and J17. The value should be < 1 Ω.
If not, check torch leads, torch head, and consumables.
2. Check resistance between Q15 and J17 with system in Gas Test mode. The value should be > 1 MΩ.
If not, verify electrode and torch plunger move freely.
3. Pilot arc shorted – check resistance between Q15 and J17 with torch removed. If value is < 1 KΩ replace Pilot
Arc IGBT.
4. Pilot arc open – use a jumper wire to jump J14 to Q15. Then attempt to fire the torch. If the torch fires replace
the Pilot Arc IGBT.
Note: All values are ±15%.
J17
Pilot Arc IGBT
Q15
J14
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