Dell Photo All-in-One Printer 942 Owner's Manual page 64

Press down on the ink cartridge lever to raise each ink cartridge lid.
3
Remove the old ink cartridges.
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photo or black
cartridge
Store the cartridges in an air-tight container, such as the storage unit you received with
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your photo cartridge (sold separately), or dispose of them properly.
If you are installing new ink cartridges, remove the sticker and transparent tape from the
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back and bottom of each ink cartridge.
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Ink Cartridge Maintenance