HP Officejet Pro X451 and X551 - User Guide
11 Solve problems
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Customer support
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Problem-solving checklist
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Restore the factory-set defaults
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Paper feeds incorrectly or becomes jammed
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Clear jams
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Improve print quality
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The product does not print or it prints slowly
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Solve Plug and Print USB Drive printing problems (X551 Series)
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Solve product connectivity problems
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Solve wireless network problems
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Solve product software problems with Windows
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Solve product software problems with Mac
ENWW 139