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3-4
CAST-AU4/B2521E
3-3 Cleaning and Replacing the Air Filter
Air is circulated in the controller of the base
machine to cool the controller. The cooling air is
introduced through the air filter on the rear of the
machine. Dust may be accumulated choking the
air filter which decreases the cooling power
causing serious damage such as thermal
breakdown of ICs if the air filter is not properly
maintained. Clean the air filter once every six
months. If the air filter is heavily clogged, replace
the air filter.
1. Turn off the POWER switch and unplug
the power cord from an electrical outlet.
2. Remove the front cover.
Remove the bottom screws. While pulling the
bottom of the cover to the front, raise the
catches on the top.
Front cover
Air filter is inside
the front cover.