Should I Keep Cleaning an Older Printhead If the Nozzle Check Only Shows a Few Missing PGBK Lines?

Question:
I have cleaned the printhead as much as I can before contacting you and before trying a stronger/professional cleaning solution. From what I was told, it may still be possible to restore the printhead. I am waiting and hoping for a resolution. Do you have any comments or advice on what I should do next?

Answer:

From the nozzle check you provided, it appears that the printhead is not in terrible condition. Based on what I can see, there are only a few missing lines in the PGBK, which is the pigment black channel. That is very different from a completely clogged printhead, where an entire color block or an entire black section is missing from the nozzle check.

In this situation, I would be careful about continuing to clean aggressively. As I often say, you can clean your printer to death, or you can start printing.

If the nozzle check only has a few missing PGBK lines, the printer may still be usable, especially if you print in medium quality or high quality mode. Higher-quality print settings usually make more printhead passes over the same area, which can help hide small nozzle gaps. In normal documents or images, a few missing PGBK nozzles may not be noticeable enough to justify more aggressive cleaning.

The important thing is to decide whether you are trying to make the printer functional or trying to make the nozzle check perfect. Those are not always the same goal. A nozzle check is a diagnostic pattern, and it can make even a small imperfection look alarming. Real-world prints may still look acceptable.

The risk is that your printhead is already around 10 years old. A printhead at that age may have dried ink, weak nozzles, internal wear, or partial electrical failure. If you keep applying strong cleaning solution, soaking the head repeatedly, forcing fluid through it, or running many cleaning cycles, you may improve a few blocked nozzles-but you may also damage the printhead permanently.

Strong cleaning solutions can soften dried ink, but they can also affect seals, adhesives, internal filters, and delicate nozzle plates if used too aggressively or too long. Pigment black ink, especially PGBK, can be stubborn because pigment particles settle and dry differently from dye ink. That is why PGBK clogs are common and sometimes harder to recover than dye-color clogs.

If the missing lines are only on PGBK, here are the main possibilities:

1. Minor PGBK clog
   This is the most hopeful situation. A few nozzles may be partially blocked with dried pigment ink. Gentle cleaning, rest time, and regular printing may gradually improve the pattern.

2. Air in the PGBK channel
   Sometimes the issue is not a solid clog but an air pocket interrupting ink flow. Too many cleaning cycles can actually make this worse by pulling more air through the system or exhausting the cartridge/ink supply.

3. Weak or aging PGBK nozzles
   If the printhead is old, some nozzles may no longer fire correctly even if they are not physically blocked. Cleaning will not fix an electrical or thermal failure.

4. Partially restricted internal filter or ink path
   The printhead may have ink flow restriction inside the PGBK channel. Surface cleaning may not fully reach this area, and forcing too much solution through the head can be risky.

5. Capping station or purge issue
   If the printer's cleaning system is not sealing or pulling ink properly, the printhead may never recover fully because the printer cannot prime the PGBK channel correctly. In that case, the problem may not be only the printhead.

Before using a stronger professional cleaning solution, I would first ask: how bad are the actual prints? If regular prints look acceptable, I would stop chasing a perfect nozzle check and begin printing. Use medium or high quality, avoid draft mode, and print something with black content regularly. Sometimes a printer that looks imperfect on a nozzle check is still perfectly usable for everyday work.

If you continue cleaning, I would avoid repeated deep cleanings one after another. Deep cleaning uses a lot of ink and can overwork the printhead and purge system. After a cleaning attempt, give the printer some rest time. Letting the cleaning solution soften dried ink gradually is usually safer than forcing the issue repeatedly.

I would also avoid leaving strong cleaning fluid in the printhead for too long unless you are prepared for the possibility that the head may not survive. With a 10-year-old printhead, there is always a balance between recovery and risk. The more aggressive the cleaning, the greater the chance that the printhead will fail completely.

So my practical advice is this: if only a few PGBK lines are missing and your actual prints are acceptable, start printing. Do not keep cleaning just because the nozzle check is not perfect. If the prints are still poor, then a controlled cleaning attempt may be reasonable, but treat it as a last effort, not a guaranteed restoration. At this age, the printhead may be restorable, but it may also be near the end of its service life.

Addressing printer issues can be a complicated affair because many problems require hands-on testing, inspection, and repair. Because of that, we are not able to provide remote troubleshooting, suggestions, or support for printer repairs beyond general guidance. We do offer an in-person evaluation and repair service through our local diagnostic facility, BCH Technologies Printer Repair Service [https://bchtechnologies.com/printer-repair-service]. Due to high demand, we operate on a first-come, first-served basis, so it may take a few weeks before we can receive your printer for drop-off. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we understand that our repair rates may not be the most economical option for every situation. For that reason, we strongly recommend self-help through online research whenever possible. A good starting point is YouTube, including our homepage at BCH Technologies on YouTube [https://youtube.com/@bchtechnologies]. You can use the search icon next to the "About" tab on the right-hand side of the menu bar to look for videos on your specific issue. I receive dozens of questions every day asking for videos on particular topics, and after creating videos for the past nine years, it is difficult to remember every single one. Using YouTube's search function is usually the fastest way to find the most relevant video, and YouTube may also suggest helpful videos from other channels.

Thank you again for reaching out and for sharing the nozzle check. Based on what you described, I would not panic over a few missing PGBK lines. If the printer can still produce acceptable prints, I would lean toward using it rather than continuing to push an older printhead with stronger and stronger cleaning methods.