Epson ET-8550 "Paper Jam With No Paper" Plus Transportation Lock and 000025 Error: Sensor vs. CRPW FFC Cable

Question: My Epson ET-8550 keeps showing a "paper jam" even though there's no paper stuck. I watched your video, and you mentioned a sensor-but what if that sensor is completely clean? Could it still be the cause? Also, this is happening at the same time as a transportation lock message and the 000025 error. Are these related?

Answer: Yes-even if the sensor looks clean, it can still be the root cause, and the CRPW FFC cable is the next critical thing to inspect (especially with "transportation lock" and error 000025).

Why "paper jam with no paper" can happen even when the sensor is spotless

A "paper jam" message doesn't always mean there's a physical sheet stuck-it often means the printer's logic is detecting impossible paper movement or invalid sensor readings during the feed path check.

Even if the sensor is visibly clean, it can still fail due to:

• A stuck or slow-moving sensor flag/lever (a tiny plastic arm that interrupts the sensor may not return freely)

• A cracked, warped, or mis-seated flag that never fully blocks/unblocks the sensor

• A sensor that is electrically failing (optical sensors can weaken or fail internally without obvious dirt)

• A wiring/connection issue where the sensor signal is intermittent (this is where the FFC cable becomes important)

So yes-you still need to check the sensor system, not just for dust, but for mechanical movement and reliable detection.

How the "transportation lock" message can tie into it

On the ET-8550, "transportation lock" warnings commonly appear when the printer believes something in the carriage travel path or paper transport path is obstructed or not behaving normally.

This can be triggered by:

• Carriage not reaching expected positions

• Carriage encoder/CR (carriage) sensing issues

• Paper feed/path sensors reporting contradictory states

• Ribbon (FFC) cable issues causing sensor signals to drop out

In other words, the "transportation lock" message can be a symptom, not necessarily the actual lock being engaged.

What error 000025 often suggests (and why it matters here)

The 000025 error code is frequently associated with carriage-related problems-the printer is detecting abnormal carriage movement or abnormal readings from sensors used to track carriage position and travel. When this happens alongside false "paper jam" detection, it often points to a shared cause: signal loss or corruption from key sensors, rather than two completely separate failures.

That's why your question is on the right track: if these issues run in parallel, we must think about something that can affect multiple inputs at once-like a damaged or intermittently failing FFC cable.

The CRPW FFC cable: why it's a top suspect when multiple errors appear together

Your CRPW FFC cable (often referred to as the CR encoder / page-width sensor FFC, depending on vendor naming) carries signals for critical carriage and page-width sensing functions. If that cable is:

• creased

• torn

• oxidized at the contacts

• partially unplugged

• pinched during a repair

• damaged by ink contamination
  ...then the printer can misread sensor states and throw a mix of errors that seem unrelated (paper jam, transportation lock, carriage codes like 000025).

This is why, even if the sensor itself is clean, you can still get the same symptoms-because the printer may not be receiving the sensor's signal reliably.

What to check (high-level diagnostic logic)

Since you're seeing (1) paper jam with no paper, (2) transportation lock warning, and (3) error 000025, here's the order of suspicion in plain terms:

1) Sensor mechanism (not just cleanliness)

• Ensure the sensor flag/actuator moves freely (no sticking, no delayed return).

• Check for misalignment: the flag should pass through the sensor gap cleanly.

• Inspect for cracks or warping in the tiny plastic pieces.

2) CRPW FFC cable condition and seating

• Look closely for kinks/creases-FFC cables can look "fine" but have broken traces internally.

• Inspect both ends: the exposed contacts should be clean and evenly colored (no dark burn marks).

• Confirm the cable is fully seated and locked into the connector evenly.

3) Anything that could physically obstruct carriage or paper path sensors

• A small scrap of paper, label backing, or adhesive can trigger path logic issues.

• Ink overspray or residue can gum up tiny sensor levers even if the optical window looks clean.

Why your "clean sensor" still doesn't clear the problem

To answer your main question directly: Yes, it can still be the issue even if it's completely clean, because the failure could be:

• mechanical (flag/lever not moving),

• electrical (sensor failing),

• or upstream (signal not reaching the board due to a damaged CRPW FFC cable).

And because you're also seeing transportation lock and 000025, the "signal pathway" explanation becomes even more likely.

Error codes mentioned

• 000025 (commonly carriage/sensor-signal related on ET-series logic when the carriage can't be tracked correctly)

• Transportation lock warning/message (often triggered when the printer senses abnormal carriage travel or conflicting sensor states)

Printer problems can be complicated because they're hands-on by nature-small mechanical misalignments, sensor flags, and cable integrity issues often can't be confirmed remotely. That's why we're not able to provide remote troubleshooting, step-by-step suggestions, or direct support for printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility, printer repair service (https://bchtechnologies.com/printer-repair-service). Because demand is high, we operate first-come, first-served, and it can take a few weeks before we're able to schedule a drop-off. Our services are structured to repair either the whole printer or specific parts, with clear instructions on how to proceed. We also realize our rates aren't the most economical, so we strongly recommend self-help through online research when possible. You can start with YouTube, including our channel homepage at BCH Technologies on YouTube (https://youtube.com/@bchtechnologies). To find the most relevant video quickly, use the search icon next to "About" on the right side of the menu bar. I get dozens of questions every day asking which video addresses which problem, and after nine years of creating videos it's hard to remember every single one-so YouTube search is the fastest approach. Plus, YouTube may surface helpful videos from other creators that match your symptom closely.

Thanks again for reaching out and for supporting BCH Technologies. I truly appreciate it, and I hope this explanation helps you narrow down why the ET-8550 can show a "paper jam" with no paper-especially when it appears alongside the transportation lock message and the 000025 error.