Epson AcuLaser C9100 Reference Manual page 239

14. Install the new waste toner collector to the printer by holding
it as shown below.
Note:
If the waste toner collector is not installed correctly, cover A may
not be closed or an error massage will be displayed on the LCD panel.
Be sure to install the waste toner collector into the frame of the
printer.
15. Close cover B. Also close the MP Tray as needed.
Maintenance and Transportation
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