IBM 5280 User's Setup Manual page 40

4. Remove and unwrap the two mirrors from the top of YOur
display station.
If
the mirrors are Smudged. clean the mirrors
with glass cleaner.
M.irrors
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); !hen lower the
bottom
of the
mirror
into its Position.
L~-~~=
-i~-------==~
User's Setup Procedures 33