MAINTENANCE
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SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
• Only qualified personnel should perform this mainte- nance.
•Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.
•Do not touch electrically hot parts.
ROUTINE AND PERIODIC
MAINTENANCE
Perform the following daily:
1.Check that no combustible materials are around the machine or in the welding or cutting area.
2.Remove any debris, dust, dirt, or materials that could block cooling air flow to the machine.
3.Inspect the electrode cables for any slits or punc- tures in the cable jacket. Also check for any other condition that could affect the proper operation of the machine.
Perform periodically:
1.In extremely dusty conditions, dirt may clog the cooling air channels, causing the machine to run hot. Blow out the machine at regular intervals with low pressure air. Clean the following parts. See
Figure D.1.
•Main transformer and choke
•SCR/diode bridge
•Control PC board
•Electrode and work cable connections
•Fan assembly
NOTE: The fan motor has sealed bearings that require no service.
•Remote control terminal strip TS1 (in machines below code 9500).
NOTE: Keeping remote control terminal strip TS1 clean is especially important in damp locations.
2.Pocket Amptrol Maintenance - Clean and maintain the optional Pocket Amptrol (if equipped). Keep the probe tip in good condition. It requires sharp edges to penetrate heavy oxide coatings on the work piece. A blunted tip could result in different welding currents for a given dial setting.
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