Canon imagePROGRAF TM-300 36" Large-Format Inkjet Printer with L36ei Scanner Kit - Manual (Page 814)

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Cause
There is a problem with the print head.
What to Do
Tap OK on the touch screen, and then replace the current print head with a new one.
Replacing the Print Head
If you do not have a replacement print head ready, turn off the power and replace the print head once you
have the new one.
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