Epson WF 3720 Replacing Ink Cartridges and Maintenance Boxes

The maintenance box stores ink that gets flushed from the system during print head cleaning. When an ink cartridge is expended or the maintenance box is at the end of its service life, you need to replace it. The WF-3720 does not include a user-replaceable maintenance box.
  • You may also need to replace a cartridge that is more than six months old if your printouts do not look their best, even after cleaning and aligning the print head.
  • Please dispose of your used Epson branded ink cartridges and maintenance boxes responsibly and in accordance with local requirements. If you would like to return your used ink cartridges and maintenance boxes to Epson for proper disposal.
Epson WF 3720 Replacing Ink Cartridges

Epson WF 3720 Replacing Ink Cartridges

Before your Epson WF 3720 Replacing Ink Cartridges, Check Cartridge and Maintenance Box Status Epson WF 3720 and its software will let you know when an ink cartridge is low or expended, or when the maintenance box needs to be replaced. Checking Cartridge Status on the LCD Screen
You can check the status of the cartridges and maintenance box using the product's LCD screen.
  1. Press the supply status button.
  2. For more information, select Print Supply Status Sheet.

Checking Cartridge and Maintenance Box Status with Windows

A low ink reminder appears if you try to print when ink is low, and you can check your cartridge or
maintenance box status at any time using a utility on your Windows computer.
  1. To check your status, access the Windows Desktop, double-click the printer Epson WF 3720 icon in the Windows taskbar, and click Details.
  2. Replace or reinstall the maintenance box or any ink cartridge as indicated on the screen. If any of the cartridges installed in the product is broken, incompatible with the product model, or improperly installed, Epson Status Monitor will not display an accurate cartridge status.
  3. To disable the low ink reminder, right-click the product icon in the Windows taskbar and select Monitoring Preferences
  4. Deselect the See Low Ink Reminder alerts checkbox at the bottom of the screen.
  5. To disable promotional offers, deselect the Display Epson Offers checkbox.
  6. Click OK.

Checking Cartridge and Maintenance Box Status - Mac

You can check the status of your ink cartridges and maintenance box using a utility on your Mac.
  1. In the Apple menu or the Dock, select System Preferences. Select Print & Fax, Print & Scan, or Printers & Scanners, select your product, and select Options & Supplies. Select Utility and select Open Printer Utility.
  2. Select EPSON Status Monitor.
  3. Do the following as necessary:
  • You can update the ink cartridge and maintenance box status by clicking Update.
  • Replace or reinstall the maintenance box or any ink cartridge as indicated on the screen.
  • If any of the cartridges installed in the product is broken, incompatible with the product model, or improperly installed, Epson Status Monitor will not display an accurate cartridge status.

Epson WF 3720 Removing and Installing Ink Cartridges

Make sure you have your Epson WF 3720 replacement cartridges handy before you begin. You must install new cartridges immediately after removing the old ones.
Leave your old cartridges in the printer until you are ready to replace them to prevent the print
head nozzles from drying out. Do not open ink cartridge packages until you are ready to install the ink. Cartridges are vacuum packed to maintain reliability.

1. Turn on Epson WF 3720
Epson WF 3720 Replacing Ink Cartridges
  • If an ink cartridge is expended, you see a message on the LCD screen. Note which cartridges need to be replaced and select To cancel errors > Yes, replace now.
  • If you are replacing a cartridge before you see a message on the LCD screen, press the home button if necessary, and select Maintenance > Ink Cartridge(s) Replacement > Next > Start .
2. Lift up the scanner unit until it clicks.
  • Do not move the print head by hand; otherwise, you may damage your product. Do not touch the flat white cable inside the printer.
3. Squeeze the tab on the cartridge and lift the cartridge straight up to remove it.
  • Dispose of used cartridges carefully. Do not take the used cartridge apart or try to refill it.
  • Warning: If ink gets on your skin, wash it thoroughly with soap and water. If ink gets into your eyes, flush them immediately with water. If ink gets into your mouth, spit it out and see a doctor right away. Keep ink cartridges out of the reach of children.
4. Before opening the new cartridge package, shake it gently four or five times.
  • Do not shake the cartridges after opening the packages, or ink may leak.
5. Remove the cartridge from the package.
  • Do not touch the green chip on the cartridge. Install the new cartridge immediately after removing the old one; if you do not, the print head may dry out and be unable to print.
6. Remove the yellow tape from the cartridge.
  • WF-3720 Series
  • WF-4720/WF-4730 Series
  • Do not remove any other labels or seals, or ink will leak.
7. Insert the new cartridge into the holder and push it down until it clicks into place.
Epson WF 3720 Replacing Ink Cartridges
8. Lower the scanner unit and select Completed on the LCD screen.

The print head moves to its home position and the printer starts charging the ink. This takes about
90 seconds. When you see a confirmation message on the screen, ink charging is finished.
Never turn off the product while the power light is flashing or you will waste ink.
  • If you see an error screen telling you an ink cartridge is installed incorrectly, lift up the scanner unit and press the ink cartridge down until it clicks into place. When you're finished, select OK.
  • If you remove a low or expended ink cartridge, you cannot re-install and use the cartridge.
  • Caution: If you remove an ink cartridge for later use, protect the ink supply area from dirt and dust and store it in the same environment as the printer. The valve in the ink supply port is designed to contain any excess ink, but do not touch the ink supply port or surrounding area. Always store ink cartridges with the label facing up; do not store cartridges upside-down.

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