Epson ST-C2100 Sublimation Printer Not Feeding Paper Properly and Printing Black as Red - Causes and Fixes

Question:
I recently received my converted EcoTank ST-C2100 sublimation printer, and I'm running into two problems. First, the rear paper feeder rarely grabs the sublimation paper correctly-it often jams immediately, and I'm wasting a lot of paper. I've tried setting the paper type to Premium Presentation Matte both in the printer and on my Mac, but it still feeds inconsistently.

Second, when I print black vector images, they come out red instead of black. I ran a nozzle check and head cleaning, and all colors printed correctly, so I'm confused why black isn't printing as expected. I'm using macOS Monterey, and I've tried adjusting ICC profiles, but nothing seems to fix the issue. What should I do?

Answer:
1. Rear Feeder Not Grabbing Sublimation Paper (Frequent Jams)

This is a very common issue with sublimation conversions, especially with thicker or coated sublimation paper.

Possible Causes:

• Paper Thickness & Coating:
  Sublimation paper is typically thicker and has a coated surface that reduces friction. The rear feeder rollers may struggle to grip it properly.

• Roller Slippage or Contamination:
  If the pickup rollers are slightly dusty, worn, or have residue, they won't grab specialty paper effectively.

• Incorrect Paper Loading Technique:
  The ST-C2100 rear feed is sensitive to how the paper is aligned and inserted.

• Driver/Feed Timing Mismatch:
  Even with correct settings like "Premium Presentation Matte," sometimes macOS drivers don't fully sync with the printer's expectations.

Recommended Fixes:

• Reload Paper Properly:
  Insert only 1-3 sheets at a time. Push the paper in until you feel resistance, then slightly pull it back and reinsert to help the rollers "catch."

• Fan the Paper:
  Separate sheets before loading to reduce static and sticking.

• Clean the Pickup Rollers:
  Use a lint-free cloth lightly dampened with water or isopropyl alcohol to clean the rollers. Rotate them manually if possible.

• Increase Friction:
  Slightly bending the leading edge of the paper (very gently) can sometimes help the rollers grab.

• Use Rear Feed Slowly:
  When sending a print job, gently guide the paper as the printer starts pulling it in.

• Check for Internal Obstructions:
  Even small scraps of jammed paper inside can affect feeding.

If the issue persists, the feed motor or roller assembly could be slightly misaligned, though that's less common on new units.

2. Black Prints Coming Out Red (Sublimation Behavior)

This is actually expected behavior for sublimation printing-but let's clarify why.

Why Black Appears Red:

• Sublimation printers do not use true black ink (K) in the traditional sense.

• Instead, "black" is created by combining cyan, magenta, and yellow (CMY).

• Before heat pressing, sublimation prints often look:

  • Reddish or brownish instead of black

  • Dull or washed out

This is because sublimation ink is designed to transform under heat, not look accurate on paper.

Key Insight:

➡️ The final color only appears correctly after heat pressing onto the substrate.

So if you press your print onto fabric or another sublimation-compatible material, the "red" black should turn into a proper deep black.

However, Double-Check These Settings:

Even though this is normal, make sure everything is configured correctly:

• Disable Color Management Conflicts:

  • In macOS print settings, avoid double color correction (don't let both the printer and software manage color simultaneously).

• Use Correct ICC Profile:

  • Ensure the ICC profile matches your specific sublimation ink and paper combination.

  • Apply it in your design software (Photoshop, Illustrator), not just in system settings.

• Print Settings:

  • Media Type: Premium Presentation Matte

  • Quality: High

  • Color Mode: No color adjustment (if using ICC)

• Check for "Grayscale" Mode:

  • Make sure you are NOT printing in grayscale or "black ink only" mode-this can cause strange color outputs.

About Error Codes

You didn't mention any specific error codes (such as Epson codes like E-01, E-02, or paper jam codes). If you begin seeing these, they can indicate:

• E-01 / General Error: Mechanical obstruction or sensor issue

• Paper Jam Errors: Misfeed detection from encoder or rollers

If any codes appear, feel free to share them for more precise guidance.

Addressing printer issues can be quite complex due to the hands-on nature of these problems. Unfortunately, we're not able to provide remote troubleshooting or detailed repair guidance beyond general suggestions. However, we do offer an in-person evaluation and repair service through 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 may take a few weeks before we can accept drop-offs. Our services cover both full printer repairs and specific component fixes, with clear instructions provided. That said, we understand our rates may not be the most budget-friendly, so we strongly encourage self-help through online resources. A great place to start is YouTube or our channel homepage (https://youtube.com/@bchtechnologies). Use the search icon next to the "About" section to find videos on your specific issue. With hundreds of videos created over the years, this is the fastest way to locate relevant content-and YouTube may even recommend helpful videos from other creators.

Thanks again for reaching out to us-we truly appreciate your patience and your support. If you have any follow-up questions or notice additional symptoms, feel free to let us know.