MAINTENANCE
powermax1650
Service Manual
3-19
0
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 M
Ω
.
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 K
Ω
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
