MAINTENANCE
5-2 HT4400 Instruction Manual
2
Introduction
Hypertherm assumes that the service personnel performing the troubleshooting testing are high-level
electronic service technicians who have worked with high voltage electro-mechanical systems. Knowledge
of final isolation troubleshooting techniques is also assumed.
In addition to being technically qualified, maintenance personnel must perform all testing with safety in
mind. Refer to the Safety section for operating precautions and warning formats.
If you need additional assistance or need to order parts, call our Customer Service or Technical Service
departments listed in the front of this manual.
Routine Maintenance
For a complete list of routine maintenance recommendations, see the Preventative Maintenance Schedule sheet
located at the rear of this section. Contact the Technical Services department listed at the front of this manual with
any questions regarding the maintenance schedule or procedures.
WARNING
SHOCK HAZARD
The large chopper capacitors store large amounts of energy in the form of electric voltage. Even if the
power is off, dangerous voltages exist at the capacitor terminals, on the chopper, and the diode
heatsinks. Never discharge 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 chopper or the capacitors.
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