ET-16500 Printhead Replacement Followed by Error 0xE5: Causes and What to Check

Question:
After replacing the printhead on an Epson ET-16500, the printer now shows error 0xE5. The issue started immediately after the printhead replacement shown in the video about replacing the ET-16500 printhead, and the user wants to know what this error means and what may have gone wrong.

Answer:

The error code 0xE5 on the Epson ET-16500 is commonly described as a CR PID speed fall error. In plain terms, this means the printer believes the carriage assembly is not moving the way it should. "CR" refers to the carriage, which is the part that holds the printhead and travels left and right during printer operation. "PID speed fall" means the carriage motion feedback is outside the expected range, so the machine stops and throws the error.

Because this happened immediately after a printhead replacement, the most likely explanation is that something in the carriage movement system was disturbed during the repair. Even if the new printhead itself is good, the printer can still show 0xE5 if the carriage cannot move smoothly or if the printer cannot correctly read its position and speed.

The common causes of error 0xE5 include the following:

1. CR encoder failure
This is one of the most common causes. The CR encoder strip is the thin transparent film strip that runs behind the carriage. It contains very fine markings that the printer uses to track carriage position and movement. If that strip becomes dirty with ink, fingerprints, grease, or cleaning fluid, the sensor may not read it correctly. The same error can also happen if the strip is partially detached, twisted, misrouted, or not seated correctly through the encoder sensor on the carriage. In some cases, the encoder sensor board itself can also fail, although after a repair it is more common that the strip was bumped, contaminated, or installed out of alignment.

After a printhead replacement, this is one of the first things I would inspect. Make sure the encoder strip is clean, straight, undamaged, and correctly threaded through the carriage sensor. If you clean it, use extreme care. A lint-free swab lightly dampened with water is safer than aggressive solvents. Avoid scratching it or wiping too hard, because the markings are delicate.

2. Carriage belt tooth skip
The CR timing belt moves the carriage back and forth. If the belt slipped a tooth during reassembly, or if the carriage was forced by hand at the wrong time, the motion can become uneven or out of sync. The printer then detects abnormal carriage speed and may trigger 0xE5. A skipped tooth can also happen if the belt is worn, frayed, or not properly seated on the pulley.

Check whether the belt sits correctly on the carriage and pulleys. Look for signs of uneven wear, missing teeth, fraying, or slack. If the belt does not track smoothly, the printer may interpret that as a carriage speed problem.

3. Improper CR timing belt tension
Even if the belt did not skip, incorrect tension can produce the same result. If the belt is too loose, the carriage may hesitate or lag. If it is too tight, the motor can be overloaded and movement may become jerky. Either condition can lead to a CR PID speed fall error.

If you had to remove or loosen any carriage-related assembly during the printhead installation, verify that the belt tension is normal and that the tensioner, if applicable, is seated correctly. The belt should not sag excessively, but it also should not feel overly stretched.

4. Paper jam or carriage obstruction
A partial obstruction can also trigger error 0xE5. Sometimes this is an obvious jam, but not always. A small piece of paper, foreign debris, dried ink buildup, a misrouted cable, or an improperly seated printhead ribbon cable can interfere with carriage travel. After a printhead replacement, ribbon cables and ink tubes are especially worth checking. If a cable is sticking out too far or rubbing against the carriage path, the carriage may slow down just enough for the printer to detect an abnormal speed condition.

Turn the printer off and gently inspect the full left-to-right travel path of the carriage. Look for anything dragging, rubbing, or blocking movement. Also make sure the printhead FFC cables are fully inserted, straight, and not folded in a way that interferes with carriage travel.

5. Motor driver or main board failure
The service description for 0xE5 also includes possible motor driver failure or main board failure. This is possible, but when the problem appears immediately after a printhead replacement, I would usually investigate the mechanical and sensor-related causes first before concluding that the main board failed. Boards can fail, but statistically, an issue introduced during disassembly or reassembly is more likely in this kind of situation.

Still, if the encoder strip is clean and properly installed, the carriage path is clear, the timing belt is correctly tensioned, and the printer still shows 0xE5, then electrical causes become more likely. That could include a damaged encoder sensor, carriage motor problem, or a main board motor-driver issue.

A practical troubleshooting order would be:

First, power the printer off and inspect the carriage path for any obstruction.
Second, inspect the encoder strip for dirt, smudges, detachment, or misalignment.
Third, check that the carriage belt is properly seated and has normal tension.
Fourth, confirm that all printhead and carriage cables are fully connected and not interfering with movement.
Fifth, if all of the above checks out, then consider the possibility of a bad sensor, carriage motor, or main board issue.

Because this error appeared right after the printhead replacement, I would pay especially close attention to anything that may have been touched during the repair: the encoder strip, carriage cable routing, belt position, and anything around the carriage frame. In many cases, the printer is not complaining about the new printhead directly, but about something that affected carriage motion during the replacement process.

Printer problems like this can be difficult to resolve because they are very hands-on by nature. For that reason, we're not able to provide remote troubleshooting, repair suggestions, or direct repair support beyond general guidance. 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 work on a first-come, first-served basis, and it may take a few weeks before we are able to receive your printer for drop-off. Our service structure is set up to repair either an entire printer or specific parts, with instructions explaining how to proceed. That said, we also understand that our rates may not be the lowest option, so we strongly encourage self-help through online research whenever possible. A good place to start is YouTube, including our YouTube channel homepage [https://youtube.com/@bchtechnologies]. You can use the search icon next to "About" on the right side of the menu bar to look for videos on your exact topic. I get dozens of questions every day asking whether we have a video on one issue or another, and after creating videos over the past nine years, it becomes difficult to remember every topic we have covered. Using YouTube's search function is usually the fastest approach, and it may also surface useful videos from other channels.

Thank you again for reaching out to us and for supporting BCH Technologies. We truly appreciate your patience, your trust, and your engagement with our content.