MAINTENANCE
3-18
Service Manual
If no problems were found during the initial resistance checks and the power supply still does not
operate correctly, perform the following corrective maintenance checks.
Note: The corrective maintenance flow charts are "best-guess" solutions. Study the system wiring
diagram and understand the theory of operation before troubleshooting. Before purchasing a major
replacement component, check with Hypertherm's Technical Service group at 1 800 643 9878 or the
nearest Hypertherm repair facility.
1. Connect the torch lead to the power supply.
2. Connect the power cord into the line voltage disconnect switch box or plug into a properly
grounded outlet.
3. Connect the gas supply to the pressure regulator at the rear of the power supply.
4. Perform the corrective maintenance checks starting on the following page.
5. After the problem has been located and repaired, refer to the
Sequence of Operation
in this
section for the normal operation of the power supply from power up to cutting.
WARNING
SHOCK HAZARD: Do not attempt repairs on the power board or control
board. Do not in any way cut away or remove the protective conformal
coating from either board. To do so will risk a short between the AC input
circuit to the output circuit and may cause serious injury or death.
The power supply and PC boards are subjected to dielectric and insula-
tion resistance tests per applicable CSA and IEC standards for the safety
of the operator and service technicians.
Removal of the protective conformal coatings and other unauthorized
repairs to the PC boards will void the warranty.
If questions or problems arise during servicing, call the Hypertherm Tech-
nical Services department at 1-800-643-9878.
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