Hypertherm HD4070 Rev.1 - Manual (Page 191)

5-28 HyPerformance HD4070 Instruction Manual
MAINTENANCE
Power distribution board PCB4 status indicators
0 4 1 6 1 0 R A . e p s
D1 D3 D4 D5
Notes: When circuit breaker CB1 is switched ON, LEDs D3-D5 will illuminate and stay illuminated.
To measure voltages at the power distribution board, find fuses F1, F2 and F3. When the power supply is
energized, take measurements from the top of each fuse to chassis ground, and then from the bottom of
each fuse to chassis ground. Measurements should be as follows:
F1: 240 VAC
F2: 120 VAC
F3: 24 VAC
If voltages are not present, or incorrect at one or more of these points, disconnect power and troubleshoot
fuses and associated pins, connectors and wiring between power distribution board connector J10 and
control transformer secondary T1.
Also, check wiring and connections between T1, CB1 and CON1.
Power distribution PC board LED list
LED Signal description/ Function
D3 240 VAC Out Power indicator
D4 120 VAC Out Power indicator
D5 24 VAC Out Power indicator