GCC Technologies Elite XL-20/600 User Manual page 186

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Remove the paper tray from the printer.
Unpack the 500-sheet feeder and remove all packing. Check that you have
the sheet feeder, the 500-sheet paper tray, and two thumb screws.
If you are working alone, place the sheet feeder next to the printer with
the curved cover to the front. If you have help, one person should lift the
printer up while the other puts the sheet feeder into place.
Lower the printer onto the sheet feeder. If you align the front right corner
of each part, you will find that the printer will locate on the three posts on
the sheet feeder.
Locate the two screw holes on the top of the sheet feeder that correspond
with the two holes on the laser printer.
Connect the sheet feeder to the printer by inserting the two thumbscrews
in the holes. Tighten the two thumbscrews.
Replace the paper tray in the Elite XL 20ppm and insert the sheet feeder's
paper tray in the sheet feeder.