Seaory S25 / S26 / S28 – Print Head Replacement (White Line on Cards)

If you see a perfectly straight white line across every printed card on your Seaory S25 / S26 / S28—and it stays in the exact same spot—this guide explains what it means and how to fix it.

Before replacing any parts, it’s smart to rule out basic causes (like cleaning and ribbon checks). If the line does not move or change after those steps, the most common cause is a failed print head pixel, and replacing the print head is the correct next step.

This article will help you:
• Understand what the white line means
• Decide when the print head needs replacing
• Replace the print head (same steps for S25 / S26 / S28)
• Renew the print head in the driver using the new serial number
• Protect your new print head with simple maintenance habits

Quick Diagnosis (30 seconds)

Use this quick rule to avoid guessing:

• If the line moves, fades, or changes after cleaning or a ribbon change, it may be maintenance-related.
• If the line is perfectly straight and stays in the exact same spot every time (even after cleaning/ribbon swap), it usually indicates a print head pixel issue → replace the print head.

1) What the White Line Actually Means

The print head is a row of tiny heating elements (“pixels”).

When one pixel dies, it never heats up. As the card passes under it, that pixel never prints, so you get:
• A perfectly straight, thin white line
• Always in the same position on every card

If you’ve already:
• Changed the ribbon
• Run cleaning cards
• Cleaned rollers
• Power cycled the printer

…and the line does not move or change, that almost always means:
One heating pixel in the print head is dead → the fix is to replace the print head.

2) Other Signs of a Failing Print Head

You may also see:
• Missing parts of barcodes or text in a fixed vertical strip
• Repeated gaps in logos or photos in the same area
• Printer/driver messages about print head end of life / lack of cleaning / physical damage
• No change after proper cleaning with cleaning cards

At that point, replacing the print head is the correct next step.

3) Same Procedure for S25, S26 & S28

For Seaory S25, S26, and S28, the print head and the replacement process are essentially the same.

You’ll need:
• A replacement S-Series print head (S25/S26/S28) Seaory10100 

4) Before You Start — Quick Prep

• Confirm the replacement print head is for Seaory S-Series (S25/S26/S28)
• Finish any print jobs
• Turn the printer off and unplug it
• Use a clean, well-lit workspace
• Avoid touching the printing edge of the new head
• Record the new print head serial number (photo or written note)

5) Step-by-Step: Replacing the Print Head

Important: Nothing should need force. Parts should release and re-seat with steady, gentle movement.

Step 1 — Open the printer
• Confirm the printer is off and unplugged
• Open the top cover to access the ribbon and print head area

Step 2 — Remove ribbon & cards
• Remove the ribbon cartridge
• Remove any cards in the feed path so the area is clear

Step 3 — Remove the old print head
• Locate the print head above the ribbon path
• Gently press it toward the spring / hook side so it unhooks from the mount
• Lift or rotate the print head away from the ribbon area
• Carefully unplug the cable/connector from the print head
• Place the old head aside on a clean surface

Step 4 — Install the new print head
• Hold the new print head by the sides, avoiding the printing edge
• Plug in the cable/connector, making sure it’s fully seated and straight
• Position the print head on the same hook / spring mount used by the old one
• Press it gently into place until it seats securely and evenly

Step 5 — Close and power on
• Reinstall the ribbon cartridge
• Check that nothing is left loose inside
• Close the top cover
• Plug in the printer and turn it on

6) Renew the Print Head in the Driver (Serial Number)

After installation, register the new print head in the driver:

1. Open Printing Preferences/Properties for your Seaory S25 / S26 / S28

2. Go to the Tool tab (or Tools section)

3. Click Renew Printhead

4. Enter the new print head serial number you recorded earlier

5. Click Apply / OK to save

This links the new physical print head with the printer’s internal tracking.

7) Test Print

Print a test card or a full-color sample card.

Check for:
• No perfectly straight white line

If the print looks correct, your replacement is complete.

If not, power off and re-check:
• Is the print head fully seated in its mount?
• Is the connector plugged in all the way?

Then close the cover and run another test.

8) Practical Habits to Protect the New Print Head

Regular cleaning helps reduce dust buildup and keeps print quality stable. A simple best practice is to clean the printer when you change the ribbon.

Recommended Parts & Supplies

• Seaory 10100 Printhead for S-Series Printers: https://bodno.com/products/seaory-10100-printhead-for-seaory-s-printers
• Seaory S-CC001 Cleaning Kit: https://bodno.com/products/seaory-s-cc001-cleaning-kit

When to Contact Bodno Support

If the line is still present after replacement:
• Printer model (S25 / S26 / S28)
• Photo of the printed card showing the white line
• Confirmation that Renew Printhead was completed in the driver
• Any errors shown on screen/driver