HP 2566C - Manual (Page 35)

Position the paper supply on the floor of the cabinet so that it is all
the way forward, towards the door. Then, center it under the tractors
(Figure 3-17). DO NOT RUN PAPER FROM A BOX PLACED
OUTSIDE THE PRINTER CABINET.
6. Position the paper.
Note
Paper jams can occur because the sides of the box are too close to the
paper stack. Pull the sides of the box away from the stack to let the
paper move freely through the printer.
7. Continue loading paper.
Proceed to “Adjusting Vertical Paper Tension” on page 3-15.
3-14 PREPARING THE PRINTER FOR OPERATION