IBM 3151 User Manual page 31

Step 2. Attaching the Label
a
b
Important: It is important that you attach the labels to avoid possible delay if it
ever becomes necessary to return the unit to IBM.
Tear off the labels from the back of the video element.
Attach one label to the front of the video element and the other to
the bottom of the keyboard.
2-6
User's Guide for
the
Cartridge to Emulate IBM and DEC Terminals
. .