HP 16V - Manual (Page 28)

Setting Up
Installing the Multi-function Feeder
The multi-function feeder (MFF) is useful to print a lot of envelopes
or transparencies. The MFF is optional for 16DV printers. It can
hold and deliver 100 sheets of 0.09 mm thick paper or 30 envelopes.
Note that the printer works if the MFF is not installed.
Notice:
When using paper, do not leave the paper in the multi-function
feeder for long time. It may cause waving of paper and dropouts in
printing.
Because the MFF does not have a mechanism that detects the
physical size of paper in use, you must inform the printer of the
paper size. Use the MFF paper size menu to select a paper size which
equals the size of paper loaded in the MFF.
To install the multi-function feeder, follow these steps:
Notice:
Be sure that the printer is turned off before installing or removing
the multi-function feeder.
1. Open the front cover.
User’s Manual 1-13