Hypertherm Powermax105 Service Manual - Manual (Page 193)

TroubleshooTing and sysTem TesTs
powermax
105 Service Manual 8-55
test 8 – torch cap switch
Symptom: Fault code 0-50 and the cap-sensor switch icon appear on the operator screen.
1. Confirm that the retaining cap is in place.
2. Remove the torch from the power supply and check the resistance between Pin 5 and Pin 7 in the torch lead plug.
a. If the resistance is very high, check for opens in the torch leads and cap sensor switch.
b. If the resistance is approximately 0 Ω:
- Reconnect the torch.
- Measure for continuity between Pin 1 and Pin 2 at J17 on the power board.
- If there is no continuity, inspect and perform a resistance test on the torch disconnect.
c. If there is no problem with the leads or switch, test the circuit boards.
- Turn off the machine and disconnect power.
- Put a jumper wire between J20 pins 1 and 2.
- Reconnect power and turn on the machine.
- If the cap-sensor switch icon is not displayed, verify the DSP board by replacing it with a known working
board. If the DSP is not the problem replace the power board.