Canon Pixma iP90 User Manual page 52

Note The BJ Printer Utility cannot be used with Bluetooth communication.
1
Double-click the hard disk icon where the printer driver was
installed, the Application folder, the Utilities folder, and then the
Printer Setup Utility icon.
If you are using an OS other than Mac OS X v.10.3, double-click the
Print Center icon.
2
Select iP90 from the Name list and click Utility or Configure.
3
Select iP90 from the Product list and click Maintenance.
4
Select Remaining Ink Level Setting from the pop-up menu.
5
Click Ink Counter Reset.
6
Select the newly installed ink tank, then click OK.