Epson ET-8550 Printhead Errors: Troubleshooting Shutdowns and Error Code 031006

Question:
I run two Epson ET-8550 printers and recently faced major issues after attempting manual printhead cleaning. One printer (with less than 6000 prints) developed a severe clog. After flushing the printhead with a 50/50 distilled water and isopropyl alcohol mix, it started shutting down and restarting immediately after receiving or starting a job-no error codes appear. The other ET-8550, which has more usage, now displays error code 031006, and the printhead won't even move. I fear using a larger 50ml syringe instead of my usual 10ml may have damaged both printheads. What troubleshooting steps or replacement options do you recommend? Also, are there other printers or brands you'd suggest for high-resolution art printing on heavy paper stock?

Answer:

1. Printer Restarting with No Error Codes

When the ET-8550 shuts down and restarts immediately without an error message, it's often a sign of an internal short circuit. Possible causes include:

• Flooded Printhead or Ribbon Cable: Using a larger syringe (50ml) may have forced excessive fluid into the printhead, saturating the internal electronics or ribbon cable. Even small amounts of liquid in the wrong place can cause a board-level short.

• Fuse Damage on the Mainboard: If the printhead drew excess current, the printer's onboard fuse may have blown. A blown fuse prevents the printer from completing normal startup and may trigger restarts.

• Moisture or Residue: Residual cleaning solution in connectors or circuits can cause intermittent shorts.

2. Error Code 031006

The second ET-8550 showing error code 031006 indicates:

• Printhead Fatal Error: This code is generally associated with printhead communication failure or carriage jam that prevents initialization.

• Possible Causes: Burnt fuse on the mainboard, a shorted printhead, or corrupted communication signals due to fluid intrusion.

• No Carriage Movement: If the printhead doesn't even attempt to move, the system likely detects an electrical fault and shuts down to prevent further damage.

3. Impact of Using a Larger Syringe

The 50ml syringe may have:

• Over-pressurized the printhead, damaging internal nozzles or rupturing seals.

• Pushed fluid past the intended flushing channels, into the ribbon cable housing or electrical contacts.

• Created conditions for permanent damage to the printhead circuitry, which explains why both printers failed after the same procedure.

4. Troubleshooting Steps You Can Try

If you're comfortable working with electronics and tools, here are some possible approaches:

• Dry Out Components: If fluid intrusion is suspected, remove the printhead, ribbon cable, and inspect for moisture. Allow complete drying before testing again.

• Fuse Testing: Use your multimeter to check continuity on the mainboard fuses. Blown fuses may be replaced by skilled technicians, though this requires soldering skills.

• Replacement Options: If the printhead has shorted, replacement is often the only solution. However, because these failures can also damage the mainboard, replacing just the head isn't always enough.

5. Alternative Printer Recommendations

If you're finding the ET-8550 series too fragile for heavy-duty art printing:

• Canon PRO-1000 or PRO-2000 series - Excellent for high-resolution prints, wide media compatibility, and more robust printheads.

• Epson SureColor P700/P900 - Designed for professional photo and art printing with stronger support for thicker media.

• HP DesignJet series - Better for wide-format or heavy-duty usage, though not as strong on fine art output as Epson/Canon.

These alternatives are typically more durable in professional settings, though they come at a higher cost.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. That's why we're not able to provide remote troubleshooting or direct repair support. We do, however, offer in-person evaluation and repair service via our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Please note that due to high demand, repairs are handled on a first-come, first-served basis, and it may take several weeks before your unit is seen. Our services cover both complete printer repairs and part-specific repairs, with clear next steps once evaluated. While our rates aren't the lowest, we encourage exploring self-help options, including our BCH Technologies YouTube channel (https://youtube.com/@bchtechnologies), where you can use the search bar (found next to the "About" section) to find relevant tutorials. With over nine years of video content, searching directly is the most efficient way to locate the right guidance, and YouTube may also suggest related videos from other experts.

Thank you again for your trust and for reaching out to us. We greatly appreciate your engagement, and we're here to support your printing journey in every way we can.