Solving Epson L14150 Set Jig Error After Replacing the Printhead

Question:
I’ve recently installed a printhead in my Epson L14150 printer, but I now receive a “Set Jig” error I cannot clear. Will replacing the mainboard solve the issue, or would you suggest something else?
 
Answer:
Thanks for contacting us with the details of your situation. We want to help you. First, I owe you an apology for not getting to your question sooner. Printer issues can be complicated as they put progress on hold, and I empathize with your frustration. I keep my answers as nuanced and elucidated as possible.
Thank you for reading this article and supporting us through our YouTube channel (https://youtube.com/@bchtechnologies). We at BCH Technologies genuinely appreciate it. The feedback we get from the industry helps us improve our technical skills and resources for the community.
Now, let’s solve the “Set Jig” error:
Understanding the Error
The "Set Jig" error is standard and usually happens when the printer's firmware fails to load correctly with the EEPROM (Electrically Erasable Programmable Read-Only Memory). This occurs when a flag is set in factory mode so the technician doesn't need to assemble the whole printer before testing it. This flag will be set to zero once the printer is ready for the market. However, EEPROM corruption can occur due to power interruptions during write operations, exceeding write/erase cycles, electromagnetic interference (EMI), software bugs, physical damage, voltage spikes, incomplete writes, or even cosmic rays. Power loss during data writing is a primary cause, potentially leading to incomplete or corrupted data. Frequent writes can wear out EEPROM cells over time, while EMI and voltage irregularities can disrupt memory integrity. Software issues or faulty firmware may unintentionally overwrite or erase data, and physical factors like heat or humidity can degrade the memory. To prevent corruption, it's essential to ensure stable power, minimize unnecessary writes, implement error-checking, shield against EMI, and regularly back up data. Then, Unfortunately, in such cases, the very common Epson Adjustment Program, generally used to clear error states, will not be authorized to change the EEPROM.
Solving Issues with EEPROM Programmer
To fix this, you must use an EEPROM programmer to directly rewrite/reset the necessary data in the chip. This process involves:
Dumping the EEPROM: We must extract the current data to identify the key. 
Programming the Key: Writing the appropriate firmware parameters into the EEPROM.
EEPROM programming is a very technical process that requires particular hardware and knowledge. If you're not experienced with it, I'd advise seeking help from someone who is or contacting your local Epson service center, as programming the wrong EEPROM could cause permanent damage. You can find the binary dump file by searching "bin dump L14150" and then writing this binary file onto your board with a programmer.
Replacing the Mainboard
In such a case, simply replacing the printer's mainboard—most of the time, EEPROM is on this board—will 100% solve the issues if accessing or programming EEPROM is not feasible. This does more than swap out a board, as a new mainboard ship is pre-configured, and it should fix the communication problems with the printhead. Though this is a relatively simple solution, it can be expensive, so consider if it’s worth the money for the printer.
Reject Firmware Update
If you don't know what you're doing, loading more firmware will only worsen it. Install only firmware appropriate for your printer and applied correctly, as the incorrect firmware can cause your printer to die. Do this with care, or leave it to the pros.
 
It can be complex because repairing printer issues like these is hands-on. This means that we can’t offer any remote troubleshooting or repair assistance. We do have a local diagnostic center that can perform in-person assessments and repairs (https://bchtechnologies.com/printer-repair-service), but due to high demand, all input is considered first in / first out, and it may take some time (weeks) for our engineers to inspect your printer.
We provide complete printer repair or part replacements and comprehensive guidelines on proceeding. Although we strive for quality work, our rates will not fit everyone’s budget. If you're a DIYer, we suggest searching for online resources. Look us up on our YouTube channel (https://youtube.com/@bchtechnologies) and then use the search icon next to “About” for specific topics. YouTube might pop up with relevant videos from other creators that could help you, too.
We appreciate you reaching out to us again, and thank you so much for your support! Feel free to ask more if you have questions or need assistance!