Maintenance and Inspection
82
11-3.
Replacing the Filter
Replace the filter with a new one every three months as a general rule. The degree of filter
contamination varies with the level of air pollution or frequency of use. Check the filter for con-
tamination through the window of the filter cover. If the filter is discolored, replace it with a new
one even if it has not been used for three months.
(1) Loosen the screw of the filter cover and open the
cover.
Filter cover
Screw
(2) Remove the contaminated filter slowly, taking care
not let dust spread, and dispose of it.
(3) Clean the filter holder and the filter cover using a
soft cloth that has been soaked in a disinfectant so-
lution and wrung out.
Filter
(4) Attach a new filter to the filter holder. Write the
date of replacement on a new filter card and stick it
in place as shown in the figure on the right for fu-
ture reference.
(5) Close the filter cover and tighten the screw.
z
Do not attempt to reuse a contaminated filter by
washing it or attaching it inside out.
z
Open the filter cover only when replacing the old
filter with a new one.
Location for
affixing the
filter
replacement
record card
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