Epson AcuLaser C9100 Reference Manual page 209

2. Remove the three screws from the cover on the right side of
the printer.
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3. Slide the cover backward. Then tilt it toward you and remove
it.
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Warning:
When you open the right side cover, be careful not to touch
the areas surrounding the caution label on the circuit board
since the areas may be very hot.
Installing Options
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