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Canon PIXMA MP830 All-In-One InkJet Printer - Page 4 Questions & Answers
Where is print head?
The printhead is in the printhead carrier. With the power on, lift the top of the printer from the front control panel. The printhead carrier will move to the center of the carriage. Remove each of the ink cartridges (place plastic electricians tape over the ink outlets to avoid leakage). Raise the lever securing the printhead. The printhead can now be removed.
Vertical lines through scanned images.
You should clean the small glass under the top lid. Chances are there is some white out or ink or mark on the glass. Look carefully because usually it is just a small dot>
Dell 924 all in one cover open
Sounds like the sensor for the cover is not working. If you open the cover when it is on, then close it, does the error remain? It only needs a microscopic amount between 'open' and 'closed' - check if there could be a tiny bit of paper somewhere around the edges.
Failing that, get in touch with Canon.
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