Test 4 – pilot arc igbt (q8), Powermax1250 – Hypertherm Powermax1250 Service Manual User Manual

Page 58

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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 = 1k

R110 = 10k

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