MAINTENANCE
3-8
Service Manual
WARNING
SHOCK HAZARD: Always turn off power and unplug cord from wall and
wait 5 minutes before removing any cover of the power supply. If power
supply is directly connected to a line disconnect box, place line discon-
nect switch to OFF position. In the U.S., use a "lock-out / tag-out" proce-
dure until the service or maintenance work is complete. In other coun-
tries, follow appropriate local or national safety procedures.
If power is required for servicing, be aware that dangerous voltages exist
within the power supply which could cause serious injury or death. If
questions or problems arise during servicing, call the Hypertherm Techni-
cal Services department at 1-800-643-9878.
Visual Inspection - Internal
WARNING
The aluminum heatsink on the power PC board is electrically live when the
plasma is on. In case of an electrical failure of the inverter circuit, the
heatsink may be live when the power is off.
SHOCK HAZARD: The large electrolytic capacitors, (blue-cased cylinders)
located on the power PC board store large amounts of energy in the form
of electrical voltage. Even if the power is off, dangerous voltages exist at
the capacitor terminals on the PC board and on certain areas of the
PC board. Never discharge the capacitors with a screwdriver or other
implement... explosion, property damage and/or personal injury will result.
Wait at least 5 minutes after turning the power supply off before touching
the PC board or capacitors. If questions or problems arise during
servicing, call Hypertherm Technical Services at 1-800-643-9878.
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