IBM 5531 Operator's Manual page 42

System Unit Filter
(continued)
3. Check the filter. If necessary, remove the filter from the frame, and replace it with a
new one.
If you need new filters, contact your place of purchase.
Before you slide the frame back into the system unit, notice that there are arrows on the side of
the frame. The arrows indicate the top of the frame. When you replace the filter, make sure
the arrows are pointing up.
Warning: The filter frame must be inserted completely for proper operation. DO NOT
FORCE the filter frame into the system unit! Remove it and try again. Make sure the
arrows on the side of the filter frame are pointing up.
4. Slide the filter frame into the system unit.
Chapter 4. Checking and Replacing Filters
4-3