Photoconductor Unit - Epson AcuLaser C4000 Reference Manual

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8. Remove the protective tape from the toner cartridge.
9. Replace the top cover.

Photoconductor unit

Prepare a new photoconductor unit for replacement when you
see a message informing you to do so.
256 Maintenance and Transportation
Caution:
Be sure to turn the knob all the way to the locked position.
Otherwise, you may have toner problems or leakage.