MUTOH VJ-628 ValueJet Operation Manual page 68

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After emptying the waste ink tank, click [Start].
"Emptying waste ink tank" on page 49
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68 Initial charging
When ink cartridges are inserted to the cartridge slots, remove them
all.
Insert cleaning cartridge to all cartridge slots.
• The arrow should face up.
• Insert all the way to the end.
• Start charging cleaning fluid
After cleaning fluid charging is done, remove all cleaning cartridges.
• Cleaning fluid starts to be discharged.
Shake the ink cartridge 2 or 3 times lightly.