Hypertherm powermax1250 - Test 4 - Pilot Arc IGBT (Q8)

4
MAINTENANCE
powermax1250 Service Manual 3-25
80
Test 4 – pilot arc IGBT (Q8)
• Check the resistance of the gate-drive circuit (R108, R110).
• If the values are not ±15% of the values listed below, replace the power board (PCB2) and the pilot arc
IGBT (Q8).
• If the values are correct, check the pilot arc IGBT (Q8) with an IGBT tester. If it fails, replace the power
board (PCB2) and the pilot arc IGBT (Q8).
Pilot arc IGBT
(Q8)
Gate-drive resistors
R108 = 1kΩ
R110 = 10kΩ