• Please find out the firmware version by printing a Supplies Information Page.
• To print the Supplies Information Page, press and hold the Start button on the printer control panel.
• If the firmware version is LW71.SB2.P025 FDN.PIR.E709, replace the cartridge with a genuine cartridge.

• If the print quality is poor, remove the toner cartridge from the printer and gently rock it side to side.
• This movement helps distribute the toner evenly within the cartridge.
• After rocking the cartridge 5–6 times, reinsert it and print a test page.
• If the issue persists, check the life of maintenance items in case they need replacing

The 40X8421-REM contains the following:

• 1 x Fuser unit
• 1 x Transfer roller
• 3 x Seperation rollers
• 3 x Pickup/ Media rollers

The image below shows which item is which:

• 1. Open the rear door of the printer and slide it off the hinges to remove it.
• 2. Press the two side latches to gain access to the fuser unit
• 3. Unscrew the two fuser thumb screws
• 4. Pull out the old fuser, install the new fuser and tighten two fuser thumb screws
• 5. Close the fuser access door, reattach and close the rear door.

Do not touch the black surface of the new roller. Oils from your skin will degrade print quality.

• 1. Open the printer’s front door and the control panel cover.
• 2. Remove the waste toner bottle and the imaging unit.
• 3. Use the gear on the right of the transfer roller to gently pull the right side up, then slide the whole roller to the right to release it.
• 4. Unpack the new transfer roller, but keep the protective sleeve on the foam for now.
• 5. Insert the left side into the arm first, then the right. You’ll hear a click when it’s locked.
• 6. Gently pull the protective sleeve off the roller.
• 7. Put the imaging unit and toner back in, then close all covers.

Avoid touching the rubber roller surface to prevent future paper jams.

• 1. Pull the paper tray out until it stops, lift it slightly, and remove it completely.
• 2. Flip down the front duplex flap to see the roller assembly.
• 3. Squeeze the latches on both sides and slide the assembly to the right to pull it out.
• 4. Hold the small paper flag down and out of the way while inserting the new unit. If it gets trapped or snapped, the printer won’t function correctly.
• 5. Slide the new assembly in until it locks and reinstall the paper tray.

• 1. Pull the paper tray entirely out of the machine.
• 2. Press the release button on the tray to pop the old roller assembly out.
• 3. Insert the right side of the new assembly first, then insert the left side down until you hear a click.
• 4. Slide the tray back into the printer.