MUTOH ValueJet VJ-1628X Operation Manual page 266

Maintenance
4. While holding the printer plug with a paper towel, shake the ink cartridge horizontally 10 times.
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5. Re-insert the ink cartridges into Ink cartridge slots.
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NOTE
Make sure you insert the ink cartridges into the original slots. Even when you have the same color
ink cartridges, do not switch and insert them into different slots.
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Ink cartridge
Paper towel
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Ink cartridge
Ink cartridge slot
VJ-1628X OPERATION MANUAL
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6.1 Shaking ink cartridges