Canon Printer Error E39 — Scanner Unit Error

What Does This Error Mean?

Error E39 means the scanner unit inside your Canon multifunction printer failed its startup check. This can happen if the scanner lid is open, there is an object on the glass, or the scanner carriage is jammed. A restart with the lid fully closed and the glass clear usually fixes it.

Affected Models

Canon PIXMA MG5720
Canon PIXMA MG5750
Canon PIXMA MG6820
Canon PIXMA MG7720
Canon PIXMA TS9120

Common Causes

The scanner lid was open or not fully closed when the printer was powered on
An object, document, or thick book was left on the scanner glass blocking the lamp
The scanner carriage is physically obstructed and cannot move to its home position
A startup firmware check detected a fault in the scanner's optical system
The scanner's lamp or sensor has failed due to age or a hardware fault

How to Fix It

Open the scanner lid and remove any documents, books, or objects from the glass.

Even a small piece of paper left in the corner can prevent the scanner lamp from homing.
Close the scanner lid firmly until it clicks shut. Do not leave it slightly ajar.

The scanner checks whether the lid is closed on startup — a partially open lid triggers E39.
Turn the printer off, wait 30 seconds, and turn it back on.

Allow the printer to complete its full startup cycle. The scanner carriage will sweep across the glass.
If the error persists, look through the glass from the side to see if the scanner carriage is stuck.

Gently open the lid and check that nothing is blocking the carriage track underneath the glass.
Try a firmware update if available — Canon occasionally releases fixes for scanner initialization faults.

Use Canon's official software (My Image Garden or IJ Printer Assistant Tool) to check for firmware updates.

When to Call a Professional

If the error appears even with nothing on the glass and the lid properly closed, the scanner unit may need professional servicing. A Canon service center can test and replace the scanner assembly. For older budget models, replacement costs may exceed the printer's value.

Frequently Asked Questions

Can I still use the print function if I get E39?

On some Canon models, E39 blocks all functions including printing. On others, you can still print but scanning is unavailable. Check whether your printer accepts print jobs while showing E39.

The scanner was working yesterday — why is E39 showing today?

Power surges, firmware glitches, or even a document forgotten on the glass overnight can trigger E39. Start with a full power cycle and clear the glass. Most cases resolve without any hardware work.

Does E39 only affect multifunction printers?

Yes — E39 is a scanner-specific error and only appears on Canon all-in-one printers that include a flatbed scanner. Print-only Canon printers do not have a scanner and will not show this code.