Canon imagePROGRAF TM-300 36" Large-Format Inkjet Printer with L36ei Scanner Kit - Manual (Page 805)

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Cause
While the printer was printing or performing maintenance, the release lever was released.
What to Do
Turn off the power, wait a moment, and then turn it back on.
If the error appears again, make a note of the detailed error code (ECxx-xxxx) that appears on the touch
screen, and then turn off the power and contact a Canon customer service center.
Detailed error codes
EC19-2F21
805