Epson ET-8550 Error 000031: How to Fix the Paper Jam or Transportation Lock Issue

Question:
I'm getting an Error Code 000031 on my Epson ET-8550 printer that says there's a paper jam - but there's no paper stuck anywhere. What could be causing this, and how can I fix it?

Answer:

Now, let's address your question about the Epson ET-8550 Error 000031 (also seen as "Fake Paper Jam" or "Transportation Lock Error").

Understanding Error 000031 on Epson ET-8550

The 000031 error code on the Epson ET-8550 typically appears when the printer's Automatic Platen Gap (APG) mechanism is out of synchronization during startup. The APG lever adjusts the distance (or gap) between the printhead and the paper. This gap must be precisely calibrated every time the printer powers on. If the printer fails to start in the correct sequence or if the APG mechanism encounters resistance, it can incorrectly detect a "paper jam" even when no paper is physically present.

This error can also be triggered by:

• The carriage (CR) position sensor not homing properly.

• A stuck APG lever or mechanical obstruction.

• Miscommunication between sensors due to startup sequence interruption.

• Or in rare cases, firmware misreads following a mechanical reset or cleaning cycle.

Step-by-Step Troubleshooting Guide

1. Power Cycle the Printer Correctly
   Turn the printer off and wait at least 60 seconds before turning it back on. This gives the APG motor time to reset. Avoid unplugging the power cable during movement, as that can cause the lever to remain misaligned on the next startup.

2. Inspect and Adjust the APG Lever
   Open the top cover and locate the APG lever (it's near the carriage assembly). Gently move it back and forth to confirm it's not stuck, obstructed, or misaligned. Dust, ink buildup, or small paper scraps can cause the lever to stick. Clean the area lightly with a soft brush or compressed air.

3. Manually Reposition the Carriage (CR) Assembly
   Sometimes, resetting the carriage position helps reinitialize the internal startup sequence. You can refer to this helpful video guide that demonstrates how to adjust the carriage position at startup:
   ▶️ How to Change CR Location During Startup
   (https://youtu.be/Cl13SYbKmj0?si=py7ejLW9OHZ30ibr)

4. Check for Hidden Obstructions
   Even a tiny scrap of paper near the feed rollers, encoder strip, or purge area can interfere with movement. Use a flashlight to inspect these areas carefully.

5. Firmware or Power Sequence Reset
   If the problem reappears after cleaning and checking the APG lever, try unplugging the printer for 5-10 minutes to allow capacitors to fully discharge, then restart. This can clear minor firmware faults related to startup timing.

6. Seek Professional Assistance
   If the above steps don't resolve the issue, the problem may be internal - possibly with the APG motor, sensors, or logic board synchronization. These parts can fall out of alignment after heavy use or shipping, requiring professional recalibration.

When to Consider Professional Repair

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. Therefore, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We do, however, offer in-person evaluation and repair services (https://bchtechnologies.com/printer-repair-service). Because of high demand, we operate on a first-come, first-served basis, so there may be a waiting period before you can drop off your printer. We can repair either your full printer or specific components, depending on your needs.

That said, we encourage you to explore self-help options through online tutorials and videos. Start by visiting our YouTube channel (https://youtube.com/@bchtechnologies). Use the search icon next to "About" on the menu bar to look for videos related to the ET-8550, APG lever, or paper jam errors. With nearly a decade of tutorials, even I rely on YouTube's search feature to locate older videos, and you may find helpful resources from other creators as well.

Thank you again for reaching out and for supporting BCH Technologies. We truly appreciate your patience and engagement - your participation helps us continue sharing technical knowledge that benefits the entire printer community.