How to Fix Epson WF-7720 Scanner Error Code 100016: Step-by-Step Troubleshooting Guide

Question:

I'm getting a scanner error message 100016 on my Epson WF-7720. What does this mean, and how can I fix it?

Answer:

Now let’s talk about that Epson WF-7720 Scanner Error 100016.

This error typically indicates a malfunction within the scanner unit, often caused by one or more of the following:

Possible Causes of Scanner Error 100016:

1. Scanner Lamp or Motor Failure
   The scanner error 100016 may result if the scanner lamp doesn't illuminate or if the scanner carriage motor stalls. The printer expects movement and light from the scanner bar during the initialization process. If it detects neither, it throws this code.

2. Loose or Damaged Internal Connections
   The flat ribbon cable or connectors inside the scanner housing might have come loose or failed. These cables transmit signals from the scanner to the motherboard, and a poor connection can cause communication errors.

3. Corrupted Initialization or Firmware Glitch
   Occasionally, the printer experiences a software-level hiccup, where it misreads the scanner's startup behavior due to incomplete boot processes or prior errors.

How to Fix Scanner Error 100016:

1. Perform a Full Power Reset
   Unplug the printer from power. Please wait at least 60 seconds, then plug it back in and turn it on. During startup, watch to see if the scanner lamp lights up and the scanner bar moves slightly.

   • If it does, your motor and lamp are likely functional.

   • If this is not the case, then one or both may be defective, or there may be a communication failure.

2. Check for Physical or Cable Damage
   If you’re comfortable opening your printer, carefully inspect the scanner assembly, cable connections, and motor area. Look for any loose wires or dislodged ribbon cables. Re-seating these may restore function.

3. Run Internal Diagnostics
   Some WF-7720 printers include an internal scanner diagnostic tool accessible via the service menu. This can help identify whether the issue lies in mechanical motion, lamp illumination, or data feedback. Check your service manual or consult a technician before using this mode.

4. Check for Firmware Errors
   If you’ve recently updated firmware or installed third-party drivers, you may want to consider a firmware reset or reinstallation, especially if the error started occurring after a change.

Addressing printer issues can be challenging, especially when they involve accessing hardware or performing internal diagnostics. Currently, we are unable to offer direct remote support or hands-on guidance for printer repairs. However, we do provide an in-person evaluation and repair service through our diagnostic center (https://bchtechnologies.com/printer-repair-service). Our facility operates on a first-come, first-served basis, and due to high demand, turnaround times can range from a few days to a few weeks. We can repair complete units or individual parts, depending on your needs. That said, we understand that our rates may not be ideal for every budget. We strongly encourage starting with self-help through trusted online sources, including our YouTube homepage (https://youtube.com/@bchtechnologies). Use the search icon next to “About” to find specific videos—we’ve built up an extensive archive over nine years, and YouTube may also recommend related tutorials from other reliable sources.

Thank you again for your question and support. I genuinely hope this helps you resolve your scanner issue and get your Epson WF-7720 running smoothly again soon!