Canon BJ-30 - Manual (Page 82)

74 Using the Operator Panel Chapter 5
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Always reset the ink gauge after installing a new BJ cartridge or a new ink
tank. If you do not perform this operation, the Low ink warning will not
operate properly.
The printer automatically estimates the amount of remaining ink by
counting the number of ink ejections. When the printer runs low on black
ink, the
Bk indicator starts to blink, indicating that your printer will run out
of ink shortly. Make sure you have a new ink tank available.
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If you replace a BJ cartridge or an ink tank with a used one, the printer will
be incapable of estimating the amount of remaining ink. Be sure to replace
the BJ cartridge or an ink tank only with a new one.