Epson ET-3750 False Paper Jam After Printhead Cleaning: Why Nozzle Checks Still Print

Question:

My Epson ET-3750 had missing yellow and magenta. After repeated head cleanings and two syringe cleanings, a nozzle check still prints, but a printer configuration page and normal print jobs report a paper jam even though I cannot see jammed paper. Some liquid may have reached circuitry near the printhead. What should I do next?

Answer:

Thank you for contacting BCH Technologies. We are sorry for the delayed reply. Printer problems are urgent, and we want to give you a careful, detailed answer. Thank you for supporting BCH and our YouTube channel.

Because liquid may have reached the electrical area, switch the ET-3750 off, unplug it, and pause further print tests, head cleanings, and syringe flushing. The 12-hour wait after cleaning does not establish that connectors or electronics are safe to power. Epson’s ET-3750 user guide [https://files.support.epson.com/docid/cpd5/cpd53995.pdf] advises unplugging the printer and arranging qualified service if liquid enters it. Do not move the printhead by force or handle internal flat cables while power is connected.

A successful nozzle check shows that one feed and print operation works; it does not rule out a fault during other jobs. Because the printer’s own configuration page also reportedly fails, a computer-driver setting alone is unlikely to explain the full pattern. The false jam could involve a small obstruction, disturbed paper-feed sensing, a connection issue, or liquid contamination. The photos and banded print do not confirm which cause applies, and they do not establish that the printhead or mainboard has failed.

Keep the photos and any error message you already recorded for a technician. Do not power the printer just to capture another picture, add more cleaning solution, or replace a board based on the warning alone. A model-specific inspection should check for residue, damaged connectors, accessible paper-path debris, and the feed mechanism before further powered diagnosis. The original missing colors may be a separate ink-delivery or printhead issue; evaluate that only after the printer is safe to test.

You can search the BCH Technologies YouTube channel [https://youtube.com/@bchtechnologies] for ET-3750 paper-feed and printhead topics, but use only instructions verified for this model. If you would like BCH to assess the printer, contact us first to confirm that we accept the ET-3750 for repair and to discuss current service availability before buying a service or shipping it. We cannot promise a particular part or a successful repair from the information available.