Hypertherm Powermax1250 Service Manual - Manual (Page 59)

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
R
6 5
R
8
2
Inverter
R82 = 994 Ω
R83 = 6.1 Ω
R65 = 995 Ω
R75 = 6.1
Ω
R84 = 10.4 Ω
R96 = .4 Ω
PFC
R87 = 994 Ω
R56 = 4.1 Ω
R98 = 1
Ω