Fixing Epson Error 031006 on WF-7720: Should You Replace the Mainboard or Just the Fuse?

Question:

In your video "Epson Error 031006 - FFC Fix for E-01 Non-Printing Features Are Available" (https://www.youtube.com/watch?v=23SxDLKOqdY), you mention possible causes of Error 031006. I’ve already replaced the printhead and the printhead data cable on my Epson WF-7720 due to a burnt-out cable and head, but I’m still getting the same error. Could it be the mainboard? I also heard there’s a fuse on the board related to the printhead — is replacing that an option, or should I just get a new mainboard altogether?

Answer:

At BCH Technologies, we’re truly grateful for your ongoing engagement and support, especially through our YouTube channel (https://youtube.com/@bchtechnologies). It’s your questions and feedback that help us improve our content and deepen our technical expertise for the benefit of the entire printer DIY community.

Now, let’s dive into your Epson WF-7720 issue with Error Code 031006.

What Error Code 031006 Means

This error typically indicates a communication failure between the printer’s mainboard and the printhead. Given that you've already replaced the printhead and the FFC (flat flexible cable), you're likely dealing with a damaged fuse on the mainboard.

The printer’s mainboard is equipped with tiny surface-mounted fuses (commonly labeled F1, F2, or F3 depending on the board layout) designed to protect circuitry from electrical surges, such as those caused by a shorted or burned-out printhead.

Confirming the Cause: The Fuse

When a printhead burns out, it often sends a voltage spike back to the board, which blows one or more of these protective fuses. Even after replacing the printhead and cable, the error persists if the blown fuse is still breaking the circuit.

Good news — in many cases, you don’t need to replace the entire mainboard. Instead, you can replace just the fuse with one like our F1/F2/F3 fuse for Epson mainboards (https://bchtechnologies.com/products/f1-fuse-also-f2-f3-for-epson-mainboard-fix-error-0x9a-or-031006-on-wf-7720-wf-7710-wf-3640-et-8550-xp-15000?_pos=2&_sid=77f5896ee&_ss=r).

These fuses are tiny SMD (surface-mount device) parts, so replacing them requires precision soldering tools and some experience working with electronics. But it's very doable if you’ve done printer disassembly before.

When to Replace the Mainboard

If you've tested the fuse and it's not the issue—or if you’re unable or uncomfortable doing SMD soldering—then replacing the mainboard is the next option. However, as you've already discovered, sourcing the correct version of the board can be a challenge. The WF-7720 has several board revisions, and even slight mismatches can cause firmware or functionality issues.

Given that buying a compatible board can be expensive and risky (especially with used parts), replacing the fuse first is usually the most economical and effective route.

Troubleshooting printer hardware can be intricate and often requires hands-on diagnostics. Due to this, we’re unable to offer remote repair assistance or custom troubleshooting. However, we do provide in-person evaluation and repair services through our diagnostic facility (https://bchtechnologies.com/printer-repair-service). Our repair services operate on a first-come, first-served basis, and due to high demand, there may be a delay before we can receive your unit. We offer structured options for repairing either full printers or specific components. That said, we understand our service fees may not fit every budget, so we strongly recommend exploring self-help options when feasible. Our YouTube channel (https://youtube.com/@bchtechnologies) is a great starting point — just use the search icon next to the "About" tab to locate videos by keyword. With over nine years of video content, even we sometimes need to search for our own tutorials! You may also discover valuable content from other creators during your search.

Thank you again for your thoughtful question and your continued support. We wish you the best of luck with your repair efforts — and don’t hesitate to reach out if you hit another technical snag!