Hypertherm Powermax350 Service Manual - Manual (Page 35)

3-11 Service Manual
M
AINTENANCE
6. No air flow; POWER ON and READY LEDs
illuminated; PRESSURE, TORCH CAP and OVER-
TEMP LEDs extinguished; fan operating.
7. PRESSURE LED illuminated; READY LED
extinguished.
8. TORCH CAP LED illuminated; READY LED
extinguished.
9. OVER-TEMP LED illuminated; READY LED
extinguished.
10. Fan not operating; POWER ON and READY LEDs
illuminated.
11. PRESSURE, TORCH CAP and OVER-TEMP
LEDs not working.
6.1 Check air system for leaks.
6.2 Check for proper torch lead connections.
6.3 Check coil voltage and connections of gas valve
GS1. Check continuity of coil. Replace if
necessary.
6.4 Check safety control board PC2 and connections.
Replace if necessary.
7.1 Check for correct air pressure.
7.2 Check for sufficient air supply pressure.
7.3 Check air system for leaks.
7.4 Check for dirty air filter/regulator and clean, if
needed.
8.1 Check torch retaining cap to ensure it is tight.
8.2 Check for proper torch lead connections.
8.3 Check safety control board PC2 and connections.
Replace if necessary.
9.1 Thermostat TP1 is open (overheating). Allow the
fan to operate; the thermostat closes when the
unit has cooled.
9.2 Check transformer T1 for signs of winding failure.
Check continuity across windings and check
connections. Check secondary voltages. Replace
if necessary.
9.3 Check safety control board PC2 and connections.
Replace if necessary.
10.1 Check coil voltage and connections of fan motor
FM. Check continuity of coil. Replace if
necessary.
11.1 Check safety control board PC2 and connections.
Replace if necessary.
Problem Cause/Solution
7-98