Sharp MX-7090N User Manual page 132

BEFORE USING THE MACHINE►PERIPHERAL DEVICES
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Make a test print or copy using the saddle stitch function to verify that stapling takes place correctly.
Press the lock button to open the
release lever.
Push the staple case firmly back in.
Align of the staple case with
Push the staple case in until it clicks into place.
Push the saddle stitch unit in.
Close the front cover.
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of the unit.