IBM 5170 - Page 186

Installation Requirements
The printer adapter to which you are connecting this
option should already be installed in your system.
If
not, refer to the option installation instructions for the
printer adapter. Install the printer adapter before
continuing.
~
DANGER
Serious shock hazards exist within the covers of the
IBM Personal Computer Graphics Printer. Do not
open these covers under any circumstance. There are
no user-serviceable parts inside.
5-20 IBM Graphics Printer