HP 2566C - Manual (Page 62)

Start your job to advance at least 10 sheets of paper onto the paper
tray (make sure the first form feeds smoothly into the stacker without
jamming).
5. Advance paper into the stacker.
6. Start the paper stack.
Make sure each form folds on the tray the same way as it came out of
the input box (Figure 4-5).
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.
1-5. SI.:- ini
Sia: k
The performance of the stacker depends on the paper folding correctly.
It is extremely important for the paper to fold the same way it was
manufactured.
USING THE POWERED PAPER STACKER 4-5