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Entry level Photosmart printer introduced in 2009. Uses HP Tri-Color ink cartridges with a disposable printhead.

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How do I remove the printer cover?

An envelope has jammed inside the printer and is not accessible from the front or back of the machine.

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Here is a document from HP telling you how to get rid of paper jams on the c4780.

Good luck!

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Thanks for this. The document reminded me about dropping the cartridge door. This solved the problem. Thanks again.

Good diagnosis.+

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0ur printer makes a loud banging noise before it prints -the noise seems to be coming from

ink cartiages when they travel to the right side ?

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Colin Stansfield 将永远感激不已
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