How to Fix Epson ET-2760 Error Code 031004 After Mainboard Replacement (Same Fix as ET-2803 & ET-8550)

Question: I replaced the mainboard in my Epson ET-2760 and now get error 031004. It finishes initializing but forces a shutdown. Is this fixable?

Understanding Epson Error Code 031004 on the ET-2760

Yes, the solution shared for the ET-2803 and ET‑8550 experiencing error 031004 applies directly to your Epson ET‑2760 as well. These models share a similar architecture in terms of the printhead thermistor, cabling, and logic board diagnostics.

The 031004 error is officially known as a printhead temperature error. It means the printer is reading an abnormally high or low resistance in the thermistor circuit, which monitors the temperature of the printhead. This reading triggers a protective shutdown to avoid further damage.

Causes of Error 031004 on the ET-2760:

1. Faulty or Shorted Printhead

   • This is especially likely if you replaced or handled the printhead recently.

   • A defective printhead can show short circuits or false temperature readings.

2. Damaged Flat Flex Cable (FFC)

   • This is the ribbon cable connecting the printhead to the mainboard.

   • Contamination, burnt traces, pin misalignment, or physical tears can all trigger this error.

3. Blown Surface-Mount Fuse on the Mainboard

   • During board replacement or a prior short circuit, one of the logic board’s tiny fuses may have blown.

   • These fuses regulate the printhead circuit power and temperature feedback.

Step-by-Step Diagnosis and Fixes

1. Inspect the FFC (Flat Flex Cable)

• Detach the printhead and carefully examine both ends of the ribbon cable.

• Look for:

  • Ink splatter

  • Burn marks

  • Creased or bent sections

  • Corroded contacts

• If damaged, replace the FFC cable before proceeding.

2. Test the Mainboard’s Fuses

• Using a multimeter, probe the miniature rectangular surface-mount fuses (labeled "F" or "FU") on the logic board.

• If the fuse has no continuity, it’s blown.

• Replace the fuse only if you're comfortable with fine soldering work—otherwise, consult a board repair specialist.

3. Disconnect the Printhead for Isolated Testing

• Temporarily disconnect the printhead and power the printer on.

• If error 031004 disappears, it confirms that the printhead is at fault.

• Only install a new printhead after confirming the FFC and fuses are in perfect working condition.

 Important Tips:

• Don’t rush to replace the printhead. If the fuse or FFC cable is faulty, the error will persist or reappear, even with a new printhead.

• Before replacing any parts, try to verify the exact source of the issue—this can save money and prevent further damage.

• Some repairs, especially to the board or fuse, require precision tools and skills. Don’t attempt unless you are confident.

If you need help identifying fuse locations, finding replacement FFC cables, or sourcing a printhead, we’re happy to assist.

Final Note on Printer Repairs

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. So, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We offer an in-person evaluation and repair service via our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Given the high demand, we operate on a first-come, first-served basis. So, it might take a few weeks before we can arrange for your printer to be dropped off.

Our services are structured to repair either the whole printer or specific parts, with clear instructions on how to proceed. However, we acknowledge that our rates aren't the most economical. Thus, we highly recommend that you resort to self-help via online research. You can start by checking out YouTube or visiting our YouTube channel's homepage (https://youtube.com/@bchtechnologies).

Use the search icon next to "About" on our channel to find specific topics. Since we’ve made videos for nearly a decade, it’s hard to remember each one. Using YouTube search helps you locate not just our videos but potentially useful ones from other channels as well.

Thank you again for reaching out and for being part of the BCH Technologies community. We’re always grateful for your support and hope this helps you get your Epson ET-2760 back up and running!