Solving Clogged Channels: Essential Tips for Epson 4900 DTF Printers!

Question: I recently converted my Epson 4900 (from 2014) for DTF printing. It worked perfectly for a month, but now the LC and LM channels suddenly stopped working. I performed a waterfall flush, and everything seemed fine. However, when I tried a nozzle check or printing, those channels still didn’t work. Could the printhead be done? Do I need to replace it, or is there another solution?

Answer: Thank you for reaching out! We’re sorry for the delay in responding. Printer issues like these can be incredibly frustrating, and we understand the urgency. At BCH Technologies, we strive to provide the most thorough and detailed responses to help resolve your issues. Your engagement with our YouTube channel (https://youtube.com/@bchtechnologies) also helps us refine our expertise, so thank you for your support.

Now, let’s dive into the issue. Here’s a detailed approach to diagnosing and fixing the clogged channels in your Epson 4900:

Step 1: Wet Capping Overnight

Proper storage of the printhead is critical for preventing clogs, especially with DTF ink, which is thicker than standard ink. To ensure the printhead doesn’t dry out, use a wet capping method:

• Turn on the printer and let the printhead settle naturally on the capping station. This ensures the head is properly aligned and sealed.

• Use a damp cleaning pad or tissue soaked with cleaning solution and place it on the capping station.

Step 2: Observe the Cleaning Function

On the next day, perform a cleaning cycle. Carefully observe the capping station to check if white ink is being drawn out during the cleaning process. Here’s what to look for:

• If white ink flows through the waste line: The printhead isn’t clogged, and the issue may be related to ink delivery or air in the lines.

• If only air or nothing comes out: This indicates either a misalignment of the printhead or a clogged capping station.

Step 3: Test the Printhead’s Parking and Seal

1. Park the Printhead: Turn on the printer and ensure the printhead parks naturally on the capping station.

2. Check the Seal: Connect a syringe and tubing to the waste line and gently draw 2 ml of air. Start with 1.5 ml and observe the resistance:

   • If you feel light resistance and can draw ink, the printhead is likely parked correctly.

   • If you only draw air, there may be a leak in the capping station’s seal or the printhead isn’t aligned properly.

   • If there’s complete resistance, the capping station may be clogged.

3. Confirm Nozzle Integrity: As you draw 1.5 ml of air, listen for the damper membrane to crinkle. This sound indicates that the nozzles are open. Afterward, slowly draw the remaining 0.5 ml and hold it for 10 seconds to ensure proper flow.

Step 4: Perform Cleaning Cycles Carefully

Once the nozzles appear functional:

• Use the printer’s standard cleaning routine. Avoid using strong cleaning cycles within 12 hours.

• Allow the printer to rest between cycles to prevent overworking the system.

• Avoid back-to-back cleanings as this could introduce air into the lines or damage components.

When to Replace the Printhead

If none of the steps above restore the LC and LM channels, and you’ve ruled out issues with the capping station and dampers, it may be time to consider replacing the printhead. Given that your printhead is from 2014 and has never been replaced, natural wear and tear could also be a factor.

Additional Resources and Services

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. So, it might take a few weeks before you can drop off your printer. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we acknowledge that our rates aren't the most economical. Thus, we highly recommend that you resort to self-help via online research. You can start by checking out YouTube or visiting our YouTube channel’s homepage (https://youtube.com/@bchtechnologies). Look for specific videos using the search icon next to "About" on the right-hand side of the menu bar. I receive dozens of queries every day asking about videos for specific topics. Having created videos over the past nine years, it's challenging to remember every single one. Therefore, using YouTube's search function would be most efficient. Plus, YouTube might suggest relevant videos from other channels that could assist you.

Thank you again for contacting us. We appreciate your support and engagement with BCH Technologies!