HP 2425 - Manual (Page 125)

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5 Pull the stapler unit back up to its original position.
6 Using the tip of a pointed object, such as a push pin or the
tip of a pencil, press gently on the test staple button once to
bring the staples to the ready position.
» Note: Be careful. Too much pressure may damage the button.
7 Close the front cover.
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