Hypertherm Powermax1250 Service Manual - Manual (Page 60)

MAINTENANCE
powermax1250 Service Manual 3-27
4
Test 6 – flyback circuit
DC power supply circuit test (+5 VDC, +10 VDC, +18 VDC, and +24 VDC).
• Verify that the diodes listed below are not short-circuited by checking their resistance (approximately 2k Ω).
Note: Check the voltage to TP1.
• Inspect the circuit for damage.
D4 = 24 VDC R1 = 24 VDC
D5 = 24 VDC R2 = 18 VDC
D7 = 10 VDC R9 = -6 VDC
D9 = 18 VDC R18 = 5 VDC
D17 = 5 VDC R20 = 0.75 Ω
R26 = 18 VDC
R55 = 18 VDC
80
80
TP1