Hypertherm powermax1250 - Test 5 - Inverter IGBT (Q6) and PFC IGBT (Q7)

MAINTENANCE
3-26 powermax1250 Service Manual
4
Test 5 – inverter IGBT (Q6) and PFC IGBT (Q7)
• Check the resistance of the gate-drive circuit.
• If values are not ±25% of the values shown below, replace the power board (PCB2) and the appropriate
IGBT.
• If values are correct, check both IGBTs with an IGBT tester. If one IGBT fails, replace the power board
(PCB2) and the failed IGBT.
80
C100
80
C100
Inverter IGBT (Q6)
PFC IGBT (Q7)
o o
o o
R65
R82
Inverter
R82 = 994Ω
R83 = 6.1Ω
R65 = 995Ω
R75 = 6.1Ω
R84 = 10.4Ω
R96 = .4Ω
PFC
R87 = 994Ω
R56 = 4.1Ω
R98 = 1Ω