How to Revive an Epson WF-3640 Print Head After 5 Years of Sitting: Black Ink Dripping Instead of Spraying and Cartridge Refill Options

Question:
I cleaned the print head on an Epson WF-3640 that had been sitting unused for about five years, with the cartridges dried out. I first tried cleaning the head with a paper towel underneath, but then decided to disassemble it for a more thorough cleaning after watching your videos. The color nozzles are pushing cleaning solution out in a fine stream, but the black nozzle is not spraying the same way. Instead, it only comes out in drops. Is that normal for this print head? Also, is there a way to refill the dried original cartridges with refill ink?

Answer:

From what you described, the color side of the print head has a fair chance of recovering, but the black channel is much more concerning. On the Epson WF-3640, black ink is pigment-based, while the color inks are dye-based. That difference matters a lot. Dye ink tends to dissolve and flush out more easily, even after long storage. Pigment ink, on the other hand, can harden inside the nozzles and ink pathways. Once it has sat for years and fully dried, it can behave almost like cement inside the print head.

So to answer your first question: no, black ink coming out only in drops instead of a fine spray is not a healthy sign. A properly flowing print head channel should push cleaning fluid or ink through in a more even mist or stream pattern under appropriate pressure. When it only drips, that usually suggests the black channel is still heavily restricted. In practical terms, this means some or most of the black nozzles are still blocked by dried pigment residue.

That said, a drip does at least show that the channel may not be 100% sealed shut. It suggests there is still some path through the head, but not enough to produce proper atomized flow. In many cases like this, the issue is not just at the nozzle plate itself. The clog may be deeper inside the black ink manifold, the internal mesh filter, or the channel structure leading to the nozzles. With pigment black, these internal deposits can become extremely stubborn after long periods of disuse.

After five years, recovery odds for the black channel are unfortunately not very good. Cleaning solution can help if the pigment has not fully hardened, but after that much time, success becomes much less likely. Sometimes repeated soaking and gentle flushing can improve flow a little, but if the black starts as drops only, I would be cautious about expecting a full recovery. Aggressive pressure should also be avoided, because forcing fluid too hard through the print head can delaminate the nozzle plate, rupture internal seals, or push debris deeper into the channel.

A few practical points may help here:

First, compare resistance between the black and color channels while flushing. If the black takes much more pressure, that strongly supports a hardened internal clog.

Second, if you continue cleaning, use only gentle and controlled pressure. Letting cleaning solution soak over time is often safer than trying to blast the blockage out.

Third, if the printer eventually reassembles and powers on, a nozzle check pattern will tell you more than the fluid behavior alone. If the black pattern is missing lines, broken badly, or absent entirely, that confirms persistent nozzle blockage.

Fourth, keep in mind that printers left unused for years may also develop issues in the capping station, pump assembly, ink lines, or dampers. Even if the print head itself partly recovers, poor suction from the maintenance station can still prevent proper ink delivery.

As for error codes, you did not mention a specific code in your message, so there is no exact printer error code to identify here. In this case, the symptom itself is the key diagnostic clue: colors pushing fluid normally, while black only drips. That pattern usually points to a severe black-channel blockage rather than an electronic failure. If your printer later displays a maintenance or print-quality related issue, that would need to be evaluated separately based on the exact code shown on the screen.

For your second question, yes, the original cartridges can sometimes be refilled, but it depends on how much work you want to do and whether the cartridges are still physically usable. One method is to drill into the OEM cartridge, refill it with suitable ink, and then reset the chip using a chip resetter. Another option is to buy refillable cartridges with ARC chips, which are auto-reset chips, often available through marketplaces such as eBay. Those are usually more convenient for people who plan to keep refilling over time.

However, there are a few things to keep in mind. If the cartridges sat dry for five years, the internal sponge or outlet area may also be compromised. Even if you refill them, they may not feed well. Also, because the WF-3640 uses pigment black and dye colors, you need to make sure the replacement ink is the correct type for each channel. Using the wrong chemistry can create even more clogging or poor print performance. If the print head's black channel is already severely blocked, refilling cartridges alone will not solve the printing issue. The head must still be able to pass ink properly.

In general, if you want the best chance of testing the printer after cleaning, using a known-good ink supply setup is important. Whether that means refilled OEM cartridges with reset chips or refillable cartridges with ARC chips, the main goal is to eliminate cartridge failure as a second variable while you evaluate the print head.

Printer problems like this can be difficult because they are so hands-on by nature. For that reason, we are not able to provide remote troubleshooting, repair suggestions, or one-on-one support for printer repair work. We do offer in-person evaluation and repair through our local diagnostic facility at printer repair service [https://bchtechnologies.com/printer-repair-service]. Because demand is high, everything is handled on a first-come, first-served basis, and it may take a few weeks before we are able to accept a printer drop-off. Our service options are organized around either repairing a complete printer or specific parts, with clear instructions on how to proceed. We also understand that our service rates may not be the lowest-cost option, so we strongly encourage self-help research first. A great 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 issue. I get many questions every day asking whether we have made a video on a specific topic, and after creating content over the past nine years, it is difficult to remember every single one. Using YouTube search is usually the fastest method, and it may also surface useful videos from other channels.

Thank you again for your support and for following our work. We truly appreciate your trust, and we wish you the best of luck with the WF-3640 recovery.