NEC NP4001 - Manual (Page 115)

6. Maintenance
103
Cleaning the Filters
The projector uses three filters to keep the fans free of dust and other particles, and
should be cleaned every 500 hours of operation. In dustier environments, it is recom-
mended to clean the filters more frequently. If the filter is dirty or clogged, your projector
may overheat. When the message below is displayed the filters must be cleaned.
Note:
When the Please clean filter message is displayed, please clean or replace
all three filters at the same time to synchronize the hours used display.
The Filter Message item should be enabled in the Options menu. Refer to Op-
tions on page
95 .
Refer to the following guide to clean the filters.
1.
Lift the projector to
expose the underside to
locate the first filter.
See the drawing on the
right.
Note: Only clean the out-
side of the exhaust vents
with a vacuum cleaner.
Bottom view
2.
The left-hand filter can be
accessed as shown.