How to Fix “Phantom Paper Jam” on Epson WF-100 When Printhead Won’t Move

Question:
I’m experiencing a phantom paper jam issue with my Epson WF-100 printer. Paper feeds through properly, and I’ve already cleaned out debris, changed the maintenance box, and installed fresh Epson ink. However, the printhead won’t move at all to start printing, and after the paper runs through, I get a “paper jam” error, though there’s nothing jammed. I’ve also tried resetting the printer multiple times. What else could be causing this?

Answer:

Now, let’s dig into your Epson WF-100 issue. You’re encountering a fairly common but frustrating error: the phantom paper jam. Based on your description, you've already taken the right initial steps—clearing debris, installing new ink, and replacing the maintenance box. The problem seems to persist because the printer incorrectly believes a jam has occurred even when no paper is physically stuck.

When the paper feeds successfully but the printhead doesn’t move, it suggests the problem likely lies in one of the following areas:

1. Encoder Strip Issues

The clear plastic encoder strip that runs behind the carriage is critical to the printer’s ability to track the printhead's position. If this strip is:

• Dirty (with ink mist, grease, or dust),

• Misaligned, or

• Dislodged from its track,

the printer may throw a "paper jam" error or prevent the printhead from moving altogether.

Fix: Gently clean the strip using isopropyl alcohol and a lint-free cloth. Make sure the strip is taut and properly aligned across the width of the printer.

2. Carriage Motor or Sensor Failure

If your printhead isn’t making any movement, not even a twitch at startup, this may indicate a carriage motor failure or a sensor board malfunction. The printer expects the carriage to initiate movement when paper is fed. If it doesn’t detect motion, it wrongly assumes that paper is jammed.

Fix: Open the top cover while powering on the printer and observe whether the printhead attempts to move. If it remains completely still, consider inspecting the carriage motor wiring and sensor board. Sometimes ribbon cables get dislodged or damaged during previous disassemblies.

3. Position Sensor Error

The Epson WF-100 uses a position sensor to synchronize movement. If that sensor is malfunctioning (due to dirt or electrical issues), the printhead won’t respond, and you’ll see the phantom jam error.

Fix: You can attempt a full power reset (not just factory reset), by unplugging the printer for 5 minutes and then restarting. If the issue persists, a detailed inspection of the sensor and motor board may be required.

4. Firmware or Software Confusion

Sometimes, the internal firmware gets confused after repeated resets or an interrupted print cycle.

Fix: Ensure you’ve done a proper hard reset (using the internal menu or button combination). If a firmware update is available on Epson’s site, consider installing it.

I know it’s tempting to give up and toss the printer when it seems stuck in this loop. But if you're open to revisiting the hardware again, I’d be happy to help guide you through specific checks one by one. We also have a detailed guide on disassembling and repairing the Epson WF-100 (https://bchtechnologies.com/blogs/blog/disassembling-and-repairing-the-epson-workforce-wf100-mobile-printer-a-stepbystep-guide) that you might find helpful if you haven't seen it already.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. As such, 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 may take a few weeks before your printer can be dropped off. Our services are structured to repair either an entire printer or specific parts, with clear instructions provided. However, we understand that our rates may not be the most budget-friendly. That’s why we recommend starting with online self-help resources. You can use our YouTube channel (https://youtube.com/@bchtechnologies) and search for specific issues using the search icon near the "About" tab on the channel menu. We’ve published videos over the past nine years, so using YouTube’s built-in search function will help you find what you need more quickly—and may even lead to helpful videos from other creators too.

Thank you again for reaching out and for being part of the BCH Technologies community!