IBM 5280 User's Setup Manual page 26

4. Remove and unwrap the two mirrors from the top of your
data station. If the mirrors are smudged, clean the mirrors
with glass cleaner.
Mirrors
5. ·Insert a mirror on each side of the display screen as follows:
Lay the mirror on the top or bottom ledge of the mirror housing
(this can be adjusted for viewing convenience); then lower the
. bottom of the mirror into its position.
User's Setup Procedures 19