For the PCL 6 printer driver

Click the menu button of the application you are using, and then click [Print].

Select the printer you want to use.

Click [Preferences].

Click the [Frequently Used Settings] tab.

You can also click the [Detailed Settings] tab, and then click [Basic] in the "Menu:" box.

Select [Black and White] in the "Color/ Black and White:" list.

Change any other print settings if necessary.

Click [OK].

Start printing from the application's [Print] dialog box.