HP Mp3130 - Digital Projector XGA DLP User Manual page 11

Setting Up the Projector
After the module is installed, you can connect input cables to the projector just as
before—except that an M1 cable plugs into the attachment module instead of into the
projector. The M1 port operates just as it did before.
To remove the module, turn off the power, unplug the power cord and cables, pinch the
tabs on the sides of the module, and remove it.
User's Guide 11