How to Change Ink Cartridges in the Epson EcoTank ET-3850
This step-by-step guide explains how to refill the ink in the Epson EcoTank ET-3850 printer using ink bottles (model number 502). Follow these instructions to ensure a smooth and efficient refill process.
1. Access the Maintenance Menu
- Turn on your Epson EcoTank printer and access the Menu.
- Navigate to the Maintenance section and press OK.
- Scroll down to the Fill Ink option and press OK again.
- A message will appear with instructions to refill the ink tanks. Press OK to proceed.
2. Open the Printer and Ink Tank Cover
- Locate the handles on the sides of the printer and pull gently to open the printer cover.
- Raise the ink tank cover to access the individual ink compartments.
3. Refill the Ink Tanks
Start with the Black Ink:
- Open the cap for the black ink tank.
- Unscrew the cap from the black ink bottle.
- Align the bottle's nozzle with the tank’s opening. The bottle is designed to fit in only one way.
- Gently press the bottle on top without squeezing it. The ink will flow into the tank automatically.
- Listen for the sound of ink flowing and stop when it reaches the top mark. The bottle will stop dispensing ink when full.
Repeat for the Other Colors:
- Follow the same steps for cyan, magenta, and yellow ink tanks.
- Ensure each tank is filled to the indicated line.
If Partially Filling Tanks:
- When you are only partially refilling the tanks, make a note of the current level after filling. This will be updated in the Ink Levels Menu later.
4. Close the Printer
- Once all tanks are filled:
- Replace the caps on the ink tanks securely.
- Close the ink tank cover.
- Lower the printer cover.
5. Update the Ink Levels in the Menu
- Return to the printer’s Menu.
- Press Proceed to confirm that the tanks have been filled.
- For each color:
- Check the box to indicate the tank has been refilled.
- If the tanks are only partially filled, adjust the level indicator to reflect the updated amount.
- Press OK to confirm the process for all colors.
- Select Yes to reset the ink levels.
6. Return to the Home Screen
- Press the Home button to exit the menu and return to the printer’s home screen.


