Epson C11CG20201
Epson WorkForce ET-3750 EcoTank Wireless Color All-in-One Supertank Printer
User Manual

This image displays the Epson WorkForce ET-3750 EcoTank printer in black, alongside its accompanying set of four EcoTank 502 ink bottles (black, cyan, magenta, yellow). The printer features a front-loading paper tray and a control panel with an LCD screen.
Introduction
About Your Printer
The Epson WorkForce ET-3750 EcoTank is an all-in-one supertank printer designed for efficient, cartridge-free printing. It combines printing, scanning, copying, and Ethernet capabilities, making it suitable for home and small office environments.
Key Features
- Cartridge-free printing with supersized ink tanks.
- High page yield: up to 14,000 pages black / 11,200 color.
- Significant ink savings with low-cost replacement bottles.
- Efficient 30-sheet Auto Document Feeder (ADF).
- Fast automatic 2-sided printing.
- Borderless printing up to 8.5" x 11".
- 2.4" color LCD for easy navigation.
- Wireless printing from various devices.

This graphic highlights the main features of the Epson ET-3750, including Wireless connectivity, Print, Copy, Scan, ADF (Auto Document Feeder), and Ethernet. It also lists additional benefits such as up to 2 years of ink in the box, high page yields, ink savings, uniquely keyed auto-stop ink bottles, and borderless printing.
What's in the Box
- WorkForce ET-3750 EcoTank all-in-one printer
- Manual
- CD-ROM for product setup
- Power cord
- 2x bottles 502 Black (127 mL)
- 2x bottles each 502 Cyan, Magenta, Yellow (70 mL)

This image shows the main components found inside the product box: the WorkForce ET-3750 EcoTank All-in-One Supertank Printer, EcoTank 502 Ink Bottles (two black, two each of cyan, magenta, yellow), a power cord, and a CD and documentation for product setup. A USB cable is noted as not included.
Setup
Unpacking and Initial Placement
Carefully remove the printer from its packaging. Remove all protective tapes and packing materials from the exterior and interior of the printer. Place the printer on a flat, stable surface near a power outlet. Ensure adequate space around the printer for operation and ventilation.
Ink Filling
The EcoTank system uses large, refillable ink tanks. Each ink bottle is uniquely keyed to fit only the corresponding color tank, preventing accidental misfilling.

This close-up image illustrates the process of refilling the ink tanks. An Epson magenta ink bottle is inverted and inserted into its designated tank, demonstrating the uniquely keyed auto-stop mechanism that prevents overfilling and ensures correct color placement.
To fill the ink tanks:
- Open the ink tank unit cover.
- Open the cap for the color you wish to fill.
- Uncap the corresponding ink bottle and insert it firmly into the filling port. The ink will automatically begin to fill the tank.
- Once the tank is full, the ink flow will stop automatically. Remove the bottle and securely close the tank cap and unit cover.
Video: Wireless Setup Using the Control Panel. This video provides a step-by-step guide on how to connect your Epson printer to a wireless network using the printer's control panel. It covers selecting wireless settings, entering network name and password, and confirming the connection.
Power On and Basic Configuration
Connect the power cord to the printer and a wall outlet. Press the power button to turn on the printer. Follow the on-screen instructions on the 2.4" color LCD to select your language, country, and initial setup preferences.
Wireless Setup
The ET-3750 supports Wi-Fi connectivity for convenient printing from various devices.
- On the printer's control panel, navigate to the Wi-Fi setup option.
- Select "Wi-Fi Setup Wizard" and follow the prompts to search for available networks.
- Choose your wireless network from the list and enter your network password (WPA/WPA2 key) using the on-screen keyboard.
- Confirm the settings, and the printer will attempt to connect to your network. A confirmation message will appear upon successful connection.
Operating Your Printer
Control Panel Overview
The printer features a user-friendly control panel with a 2.4-inch color LCD screen and intuitive buttons for navigation and function selection.

This image of the Epson ET-3750 printer points out several key operational features: Auto 2-sided printing, a 2.4-inch color LCD, a 30-sheet Auto Document Feeder, PrecisionCore technology, 150-sheet paper capacity, integrated easy-to-fill ink tanks, and smartphone/tablet printing capabilities. It also shows the printer connected to a mobile device.
Loading Paper
The front paper cassette holds up to 150 sheets of plain paper.
- Pull out the paper cassette from the front of the printer.
- Slide the side edge guides outward.
- Load paper print-side down, ensuring it is aligned with the edge guide.
- Slide the edge guides against the paper.
- Insert the paper cassette back into the printer.
Printing Documents
Send print jobs from your computer or mobile device. The printer supports automatic 2-sided printing to save paper and borderless printing for photos up to 8.5" x 11".
Scanning and Copying
Use the flatbed scanner or the 30-sheet Auto Document Feeder (ADF) for scanning and copying multiple pages efficiently. Select "Copy" or "Scan" from the control panel and follow the prompts.
Mobile Printing
Print directly from your iPad, iPhone, Android tablets, and smartphones using compatible Epson apps or services like Apple AirPrint. Ensure your mobile device and printer are connected to the same wireless network.
Video: Epson WorkForce ET-3750 EcoTank Wireless Color All-in-One Supertank Printer Overview. This video provides a comprehensive overview of the printer's capabilities, including its cartridge-free design, high ink yield, automatic two-sided printing, PrecisionCore technology for quality output, and various features like the ADF and mobile printing options.
Maintenance
Checking Ink Levels
Visually inspect the ink levels through the transparent ink tanks on the front of the printer. You can also check ink levels on the printer's LCD screen or through the Epson printer software on your computer.
The ink tanks are designed for easy visual monitoring of ink levels.
Replacing Ink
When an ink tank is low, refill it using genuine Epson 502 replacement ink bottles. Follow the ink filling instructions in the Setup section.
Cleaning the Printer
Regularly perform print head cleaning and nozzle checks through the printer's maintenance menu to ensure optimal print quality. Clean the exterior of the printer with a soft, damp cloth.
Troubleshooting
If you encounter issues with your printer, refer to the following common solutions:
- Paper Jams: If a paper jam occurs, follow the on-screen instructions on the LCD panel to clear the jam. Ensure paper is loaded correctly and not creased or torn.
- Print Quality Issues: For faded prints, streaks, or incorrect colors, perform a nozzle check and print head cleaning from the printer's maintenance menu. Ensure ink tanks are adequately filled.
- Connectivity Problems: If the printer is not connecting to your network, verify your Wi-Fi password, ensure the printer is within range of your router, and restart both the printer and router.
- Software Issues: If printing from your computer or mobile device is problematic, ensure printer drivers and software are up to date.
For more detailed troubleshooting, consult the comprehensive User Guide (PDF) available online or on the included CD-ROM.
Specifications
| Feature | Detail |
|---|---|
| Brand | Epson |
| Model Name | ET-3750 EcoTank |
| Item model number | C11CG20201 |
| Printing Technology | Inkjet |
| Printer Output | Color |
| Special Feature | Ethernet,Wireless |
| Connectivity Technology | Wi-Fi |
| Maximum Media Size | 8.5 x 14 inch |
| Max Input Sheet Capacity | 150 |
| Dual-sided printing | Yes |
| Duplex | Automatic |
| Scanner Type | Sheetfed |
| Additional Printer functions | Copy, Scan |
| Display Type | LCD |
| Power Consumption | 12 Watts |
| Item Weight | 14.8 Pounds |
| Product Dimensions | 16.4"D x 19.8"W x 10"H |

This image shows the physical dimensions of the Epson WorkForce ET-3750 printer: 14.8 inches wide, 13.7 inches deep, and 9.1 inches high. A coffee mug is placed next to it for scale.
Warranty and Support
Limited Warranty
The Epson WorkForce ET-3750 EcoTank printer comes with a 12-month standard limited warranty or 50,000 plain paper sheets (whichever happens first). For an additional 12 months (total of 24 months or 50,000 plain paper sheets, whichever happens first), register your product and use Epson genuine ink bottles. Refer to the Limited Warranty document for full details.
Customer Support
For further assistance, technical support, or to access the full user manual, please visit the official Epson support website or contact their customer service.
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