HP Deskjet 6600 Printer series printer - (Macintosh OS X) User's Guide

4. Gently place the printer on top of the paper tray.
13.2.2 Loading the 250-Sheet Plain Paper Tray Accessory
Two parts
The 250-Sheet Plain Paper Tray Accessory has two parts.
1. Base
2. Lower tray
The lower tray has three size adjusters.
HP Deskjet 6600 series printer User's Guide
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