HP Deskjet 6988dt Printer - Manual (Page 169)

2. Insert the accessory into the back of the printer until both sides snap into place.
Note Do not press the buttons on either side of the accessory when
installing it into the printer. Use the buttons only when removing the
accessory from the printer.
Enable the duplexer
Follow these step to enable the duplexer:
1.
Open the printer Toolbox .
2. Click the Configuration tab.
3. Click Automatic Two-Sided Printing Module or Auto Two-Sided Print
Accessory with small paper tray, and then click Apply.
4. Click OK in the confirmation box that is displayed.
5. Click the X in the upper-right corner to close the screen.
Note After the duplexer is enabled, it is not necessary to re-enable it every time
you print.
Print postcards
Guidelines
●
Use only cards that meet the specifications for the Auto Two-Sided Print Accessory
with Small Paper Tray. For more information, see the
Auto Two-Sided Print
Accessory with Small Paper Tray specifications .
● When printing a large number of cards, remove the printed material from the printer's
Out tray about halfway through the print job.
● Do not exceed the maximum capacity for the rear tray: 100 cards.
Prepare to print
1.
Slide the paper-width guide to the left.
2. Pull the paper lever forward and insert the cards.
The address side of the cards should face outward.
User's guide 167