- Remove the toner supply unit inner cover. (Toner Supply Unit Inner Cover)
 - Remove the fixing screws of the toner supply unit [A].*
* Pro C5200S/C5210S use TCRU/ORU screws - Slide forward the toner supply unit [A].
 - Remove the toner cartridge [A].
 Remove the toner cartridge guide [A].
- When installing, tighten the screws on the bottom [A] while holding from the top as shown below.
 - When installing, hook the hooks [A] under the bottom of the guide correctly.
 
- When installing, tighten the screws on the bottom [A] while holding from the top as shown below.