Epson WF-7510 Won’t Turn On After Printhead Replacement? Here’s What Might Have Happened and How to Fix It

Question:
I recently replaced the printhead on my Epson WF-7510. To unlock the printhead carriage, I powered the printer on, then unplugged it while the carriage was free. After swapping in the new printhead and powering the printer back on, it prompted me to set the date and time. However, after entering the date, the printer shut off and won’t turn on again. I’m not sure if the power supply failed, the printhead caused the issue, or if it has something to do with setting the date to 2025. Can this be fixed—and can you confirm if the new printhead is still functional?

Answer:
Thank you for reaching out to us—and thank you especially for your humor! That line about a “secret self-destruct if the date is set to 2025” definitely gave us a laugh here at BCH Technologies. 😄

First off, I’m sorry I couldn’t respond sooner. I completely understand that printer issues like this can bring your work to a halt, and we always want to give each situation the careful attention it deserves. Thank you for your patience. We’re also deeply grateful for your support of our YouTube channel (https://youtube.com/@bchtechnologies), where your feedback continues to help us improve and expand our repair guides and technical content.

Let’s talk through what likely happened with your WF-7510.

Why Your Epson WF-7510 Might Not Power On After Printhead Replacement

Unplugging the printer while it’s powered on—especially during motion or setup—can trigger several types of failures or protection states. From what you described, it sounds like the printer initially recovered (prompting for date/time), but then shut down, and now doesn’t respond to the power button. Here's what might be going on:

🔌 1. Power Supply Board Failure

The printer’s internal power supply unit (PSU) may have experienced a spike or brownout during the unplugging event. These boards are sensitive and, when interrupted mid-process, may short out or cease functioning entirely.

🔧 2. Blown Fuse or Mainboard Protection Circuit

Many Epson models, including the WF series, include onboard fuses or MOSFET-based protection circuits that can blow or lock up under abnormal power conditions. If the mainboard detects a short or unexpected load (even from a new printhead with slightly different resistance), it may shut down permanently until repaired.

🖨️ 3. Printhead Compatibility or Wiring

Although unlikely in this case, if the replacement printhead had an electrical fault or was seated improperly, it could draw excessive current through the head driver ICs, which might also cause a shutdown or fuse trip. This doesn't necessarily mean the printhead is bad, but it is something we check carefully during diagnostics.

What We Can Do at BCH Technologies

Yes—we can absolutely help get your WF-7510 back in action. Here’s how we approach this:

• ✅ Test the power supply board for correct voltage output to the mainboard.

• ✅ Examine the mainboard for blown fuses, failed ICs, or shorted components.

• ✅ Evaluate the new printhead for electrical issues or incompatibility.

• ✅ Inspect all ribbon cables and connectors for bent pins or improper seating.

• ✅ If needed, test functionality by restoring the printer to working condition and running test prints.

If you’re local or wish to ship it in, you can choose our WF-7510 printer repair service directly on our website. In the order notes, mention this specific situation so our techs know exactly what to check.

We also offer partial diagnostics or component repair if you prefer not to service the entire printer. Just note that if you choose mainboard-only repair, we won’t be able to verify printhead function or overall printing performance unless the full printer is available.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. So, 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. It might take a few weeks before we can get your printer on the bench. Our services are built to repair either a full printer or specific sections, with step-by-step instructions on how to proceed. That said, we understand our rates may not suit everyone. So we encourage self-repair when possible. You can begin by checking out our YouTube channel homepage (https://youtube.com/@bchtechnologies) and using the search bar near the “About” tab to locate videos related to your printer model or error.

Thanks again for contacting us and for trusting BCH Technologies with your WF-7510. We’re looking forward to helping you bring it back to life—and confirming that your printhead upgrade is a success!