What Does Warning Ribbon In Mean on a Zebra 105SL?

The Zebra 105SL can operate in two main print modes: thermal transfer and direct thermal. Thermal transfer printing uses ribbon. Direct thermal printing does not use ribbon and relies on heat-sensitive labels instead.

A Warning Ribbon In message usually appears when the printer is configured for direct thermal printing but detects ribbon inside the printer. In other words, the printer believes ribbon should not be present, but the ribbon sensor is seeing ribbon in the path.

• Zebra 105SL shows Warning Ribbon In on the display.
• Ribbon is installed while the printer is set to direct thermal mode.
• The printer was switched from thermal transfer to direct thermal.
• The driver or label software is sending direct thermal settings.
• Ribbon was left inside the printer after changing label types.
• Ribbon sensor is dirty, blocked, or reading incorrectly.
• Printer settings do not match the loaded supplies.
• Calibration values may be incorrect after media changes.
• The printer may have a sensor or internal hardware issue.

Zebra 105SL Warning Ribbon In Quick Reference

Use this table to match the symptom with the first setting or area to inspect.

Step 1: Confirm the Label Type

The first step is confirming what type of labels are loaded. Direct thermal labels do not require ribbon. Thermal transfer labels require ribbon. If the wrong print mode is selected for the label type, the 105SL may show ribbon warnings, print blank labels, or fail to print correctly.

Label Type Checks

• Confirm whether the labels are direct thermal or thermal transfer.
• Check the label box or supply documentation if available.
• If unsure, test with known-good supplies.
• Make sure the print mode matches the label material.
• Do not leave ribbon installed when running direct thermal mode.

Step 2: Verify Print Mode

Print mode is the most important setting when troubleshooting a Warning Ribbon In error. The printer must be set to match the supplies installed in the printer.

Print Mode Checks

• If ribbon is installed, confirm the printer is set to thermal transfer.
• If ribbon is not needed, confirm the printer is set to direct thermal.
• Check print mode from the printer control panel.
• Check print mode in the Windows driver.
• Check print mode inside the label software.
• Restart the printer after changing settings.

Step 3: Remove Ribbon If Using Direct Thermal Labels

If the printer is supposed to be running direct thermal labels, ribbon should not be installed. Leaving ribbon inside the printer can trigger the Warning Ribbon In message because the printer is configured not to use ribbon.

1. Open the media door.
2. Raise the printhead assembly.
3. Remove the ribbon supply roll.
4. Remove ribbon from the take-up spindle.
5. Check for ribbon pieces or torn ribbon left in the path.
6. Reload the direct thermal labels correctly.
7. Close the printhead fully.
8. Run calibration and test print.

Step 4: Set Thermal Transfer Mode If Ribbon Is Required

If your label stock requires ribbon, the solution is not to remove ribbon. The correct fix is to set the printer to thermal transfer mode so the printer expects ribbon to be present.

Thermal Transfer Setup Checks

• Confirm the labels require ribbon.
• Set the printer to thermal transfer mode.
• Load ribbon correctly.
• Confirm ribbon coating direction.
• Remove slack from the ribbon path.
• Run media and ribbon calibration.
• Send a test print after saving settings.

Step 5: Check Driver and Label Software Overrides

The Zebra 105SL may have the correct setting on the printer panel, but the computer can still send a different print mode when a job is printed. This is common when labels are printed from multiple workstations, ERP systems, shipping platforms, or label design applications.

Software Override Checks

• Open the Zebra 105SL printer preferences in Windows.
• Check the selected print method.
• Confirm direct thermal or thermal transfer mode is correct.
• Open the label software and check printer settings.
• Confirm the application is not forcing direct thermal mode.
• Confirm the correct printer driver is selected.
• Save changes and restart the printer before retesting.

Step 6: Run Media and Ribbon Calibration

After changing print mode, removing ribbon, installing ribbon, or changing labels, calibration helps the 105SL detect the loaded supplies correctly. Incorrect sensor values can cause the printer to report ribbon conditions incorrectly.

When to Calibrate

• After switching between direct thermal and thermal transfer.
• After removing ribbon.
• After installing ribbon.
• After changing label size or material.
• After cleaning the sensor area.
• After a ribbon jam or media jam.
• Any time ribbon warnings continue after settings are corrected.

Step 7: Clean the Ribbon Sensor Area

If the Warning Ribbon In message remains after ribbon is removed and direct thermal mode is selected, the ribbon sensor may still be detecting debris, ribbon fragments, dust, or contamination.

Cleaning Checks

• Power off the printer before cleaning.
• Open the media door and raise the printhead assembly.
• Remove ribbon and labels if needed.
• Inspect the ribbon path for leftover ribbon pieces.
• Check for dust, adhesive, and label debris near the sensor area.
• Clean the sensor area using approved printer cleaning supplies.
• Reload supplies, close the printer, and recalibrate.

Step 8: Check for Ribbon Left on the Take-Up Spindle

When switching from thermal transfer to direct thermal printing, ribbon is sometimes removed from the supply side but left wrapped around the take-up spindle. The printer may still detect ribbon in the path or near the sensor area.

• Check the ribbon supply spindle.
• Check the ribbon take-up spindle.
• Remove all ribbon from both sides.
• Check for torn ribbon pieces under the printhead.
• Confirm the ribbon path is completely clear before testing direct thermal mode.

Step 9: Reset Conflicting Settings If Needed

If the error continues after settings, supplies, cleaning, and calibration have been checked, the printer may have conflicting configuration values saved from previous use. This is more common on older industrial printers that have been used with several label formats or applications over time.

Before Resetting Settings

• Record current network settings if the printer is networked.
• Record darkness, speed, label size, and media type settings.
• Confirm you can reconfigure the printer after the reset.
• Only reset settings if normal troubleshooting does not clear the issue.

Step 10: When the Warning Ribbon In Error Still Does Not Clear

If the printer is set correctly, the supplies match the settings, ribbon has been removed or installed as needed, calibration has been performed, and the sensor area is clean, the problem may require deeper diagnostics.

Possible Service-Related Causes

• Ribbon sensor contamination that cannot be cleared with basic cleaning.
• Damaged or failing ribbon sensor.
• Ribbon sensor cable issue.
• Incorrect or corrupted printer configuration.
• Driver or application repeatedly sending the wrong print mode.
• Loose internal connection.
• Main logic board issue.

Zebra 105SL Warning Ribbon In Troubleshooting Checklist

• Confirm whether the labels are direct thermal or thermal transfer.
• If using direct thermal labels, remove ribbon.
• If using ribbon, set the printer to thermal transfer mode.
• Check print mode on the printer control panel.
• Check print mode in the Windows driver.
• Check print mode in the label software.
• Remove ribbon from both the supply and take-up sides if direct thermal is being used.
• Check for torn ribbon fragments in the printer.
• Clean the ribbon sensor area.
• Run media and ribbon calibration after correcting supplies.
• Restart the printer and send a test print.
• Inspect for recurring sensor or configuration issues if the warning returns.

FAQ: Zebra 105SL Warning Ribbon In Error

What does Warning Ribbon In mean on a Zebra 105SL?

It usually means the printer is configured for direct thermal printing but is detecting ribbon inside the printer.

How is Warning Ribbon In different from Ribbon Out?

Ribbon Out usually means the printer expects ribbon but does not detect it. Warning Ribbon In usually means the printer does not expect ribbon but detects it.

Why does the warning appear after changing labels?

The new labels may require a different print mode. If you switched from thermal transfer labels to direct thermal labels but left ribbon installed, the warning may appear.

Can software cause the Warning Ribbon In error?

Yes. The printer driver or label software can override the printer setting and send a print mode that does not match the loaded supplies.

Should I remove ribbon when using direct thermal labels?

Yes. Direct thermal labels do not use ribbon. If ribbon remains installed while the printer is set to direct thermal mode, the printer may show Warning Ribbon In.

Can a dirty sensor cause this warning?

Yes. Dust, adhesive, or ribbon fragments near the ribbon sensor can cause incorrect detection and trigger false ribbon warnings.

Should I calibrate after changing print mode?

Yes. Calibration is recommended after changing between direct thermal and thermal transfer, changing labels, removing ribbon, or installing ribbon.

When should the printer be serviced?

If print mode, supplies, software settings, cleaning, and calibration are all correct but the warning continues, the printer may need inspection for ribbon sensor, cable, configuration, or board-level issues.