1. Introduction
This manual provides essential instructions for setting up, operating, and maintaining your Epson Workforce ES-400 II Color Duplex Desktop Document Scanner. Please read this manual thoroughly before using the scanner to ensure proper operation and to maximize its performance.

Image 1.1: The Epson Workforce ES-400 II scanner with documents ready for scanning. This device is designed for efficient two-sided document scanning.
2. Setup and Installation
2.1 Unpacking the Scanner
Carefully remove all components from the packaging. Ensure all items listed in the 'In the Box' section are present. Retain packaging for future transport or storage.

Image 2.1: The scanner and its included accessories: SuperSpeed USB 3.0 cable, AC adapter with power cable, and a 'Start Here' poster.
2.2 Connecting the Scanner
- Connect the AC adapter to the scanner's power input and then plug it into an electrical outlet.
- Connect the supplied USB cable to the scanner's USB port and to an available USB port on your computer (PC or Mac).
2.3 Software Installation
Before using the scanner, install the necessary software. The Epson ScanSmart Software and TWAIN driver are essential for full functionality.
- Epson ScanSmart Software: This intuitive software allows you to preview scans, email files, upload to cloud services, and manage documents.
- TWAIN Driver: Ensures compatibility with most document management software, allowing seamless integration into existing office workflows.
Refer to the 'Start Here' poster or the official Epson support website for detailed software installation instructions.
3. Operating the Scanner
3.1 Loading Documents
The scanner features a 50-sheet Automatic Document Feeder (ADF) for efficient batch scanning.
- Fan the edges of the document stack to prevent misfeeds.
- Place the documents face-down into the ADF, ensuring they are aligned with the document guides. Adjust the guides to fit the width of your documents.

Image 3.1: Batch scanning with the 50-sheet Auto Document Feeder, accommodating various paper types and sizes.
3.2 Scanning Process
The ES-400 II supports fast, two-sided scanning, capturing both sides of a document in a single pass.
- Initiating a Scan: Use the Epson ScanSmart software on your computer or the control panel buttons on the scanner to start a scan.
- Scan Speed: The scanner can process up to 35 pages per minute (ppm) or 70 images per minute (ipm) for two-sided documents.

Image 3.2: The scanner's single-step technology captures both sides of a document in one pass, achieving high scan speeds.
3.3 Using Epson ScanSmart Software
The ScanSmart software provides powerful tools for managing your scanned documents.
- Preview and Edit: Review scanned images, rotate, crop, and make other adjustments before saving.
- File Management: Create searchable PDFs using Optical Character Recognition (OCR) or convert scans to editable Word or Excel files.
- Sharing Options: Easily email scanned documents or upload them directly to popular cloud storage services such as Dropbox, Evernote, Google Drive, and OneDrive.

Image 3.3: The Epson ScanSmart software interface, allowing users to organize, preview, and share scanned documents.
3.4 Image Adjustment Tools
The scanner includes features to enhance scan quality:
- Auto Crop
- Blank Page Skip
- Background Removal
- Dirt Detection
- Paper-Skew Correction
4. Maintenance
4.1 Cleaning the Scanner
Regular cleaning helps maintain optimal scan quality and prevents paper jams.
- Turn off the scanner and unplug the AC adapter before cleaning.
- Use a soft, lint-free cloth dampened with a mild, non-abrasive cleaner to wipe the exterior of the scanner.
- Refer to the detailed user guide for instructions on cleaning the interior components, such as the rollers and glass surfaces.
5. Troubleshooting
If you encounter issues with your scanner, refer to the following common solutions. For more comprehensive troubleshooting, consult the official Epson support resources.
5.1 Common Issues and Solutions
- Scanner Not Detected: Ensure the USB cable is securely connected to both the scanner and the computer. Verify that the scanner is powered on. Reinstall the scanner drivers if necessary.
- Paper Jams: Open the scanner cover and carefully remove any jammed paper. Ensure documents are properly fanned and aligned before loading into the ADF.
- Poor Scan Quality: Clean the scanner's glass surfaces and rollers. Adjust image settings in the Epson ScanSmart software, such as resolution or color mode.
6. Specifications
Below are the key technical specifications for the Epson Workforce ES-400 II scanner:
| Feature | Specification |
|---|---|
| Product Dimensions | 11.6"D x 11.6"W x 6.9"H |
| Item Weight | 8.14 pounds (3.7 Kilograms) |
| Scanner Type | Document |
| Connectivity Technology | USB |
| Resolution | 300 dpi |
| Color Depth | 8 bpp |
| Standard Sheet Capacity | 50 sheets (Automatic Document Feeder) |
| Optical Sensor Technology | CCD |
| Date First Available | November 26, 2020 |

Image 6.1: Physical dimensions of the Epson Workforce ES-400 II scanner.
7. Support and Warranty
For additional support, detailed user guides, software downloads, and warranty information, please visit the official Epson support website. The comprehensive User Guide (PDF) is available for download and provides in-depth information on all aspects of your scanner.
Warranty details are provided with your product documentation. Please refer to these documents for specific terms and conditions.





