Canon LR1 User Manual page 38

Press the ink light reset buttons only after installing a new BJ cartridge.
Press each button, one at a time.
Do not press these buttons when installing a BJ cartridge that has been used
before. The printer will not be able to detect when the ink runs out.
Close the BJ cartridge access cover.
When the printer beeps and the
Using BJ Cartridges
Chapter 2
light goes out, you are ready to print.
BUSY
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