The Mac computers store your network password information locally in what is called the 'Keychain'. When you change your network password, it is NOT automatically updated in the keychain which will cause an authentication problem when you try to print.
Use the following procedure to register a user's authentication information in the printer driver.
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On the [Start] menu, click [Control Panel], and then click [Printers and Faxes] in the [Printers and Other Hardware] category.The [Printers and Faxes] window appears.
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Select the icon for this printer, and then click [Properties] in the [File] menu.The printer properties dialog box appears.
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Click the [Device Settings] tab, and then click [Settings...] in the [Accessories] area.
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Click the [Advanced Options] menu list.
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Select [Confirm authentication information when printing].To encrypt the password also, select [Encrypt] and enter the driver encryption key.
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Click [OK].If the [Confirm Driver Encryption Key] dialog box appears, re-enter the same encryption key, and then click [OK].The printer properties dialog box reappears.
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Click the [General] tab, and then click [Printing Preferences...].The [Printing Preferences] dialog box appears.
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Click [Properties...].The printing preferences properties dialog box appears.
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Click [Job Options] in the menu list.
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Enter the user's user name and password in the boxes in the [User Authentication] area, and then click [OK].If user code authentication is enabled, enter a user code containing up to eight digits in the [User Authentication] box. A login password is not required if user code authentication is enabled.
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Re-enter the same password, and then click [OK].
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Click [OK] twice.