Hypertherm Powermax105 Service Manual - Manual (Page 192)

TroubleshooTing and sysTem TesTs
8-54
powermax
105 Service Manual
test 7 – Start signal
Symptom: There is no arc when the torch trigger is closed.
If the start icon is displayed and there is a fault code 0-51 at power up:
• Remove the torch from the system.
• Check the resistance between Pin 6 and Pin 7 In the lead plug, with the torch trigger open (not pulled).
• If there is very low resistance, inspect the lead set and trigger switch for shorts and replace or repair as
necessary.
If the icon is not displayed at power up and does not appear when the torch trigger is closed:
• Remove the torch from the system.
• Close the trigger switch and check the resistance between Pin 6 and Pin 7.
• If there is very high resistance, inspect the lead and trigger switch for opens and replace or repair as necessary.
If there is no problem found with the torch wiring or trigger switch and there is still no arc or start icon:
• Turn the machine off and disconnect power.
• Remove the nozzle and electrode from the torch and re-install the retaining cap.
• Reconnect power and turn the machine on.
• Temporarily connect J17 Pin 2 to Pin 3. (CAUTION: Gas will flow to the torch)
Pin 2
Pin 1
Pin 3
• If gas does not flow and there is no start icon on the display, perform the continuity check on page 8-29:
- Verify the DSP board is working by replacing it with a known good DSP board.
- If the DSP board is not the problem, replace the power board.