Lexmark 640 사용자 설명서

If you are having trouble reading your operator panel display, the LCD contrast and brightness can be adjusted through the 
utilities menu.

The LCD Brightness and LCD Contrast settings are adjusted separately. To change the LCD Brightness or LCD Contrast 
settings:

Make sure the printer is on.

Press 

 on the operator panel.

Press 

 until the 

 appears next to Settings, and then press 

.

Press 

 until the 

 appears next to Utilities Menu, and then press 

.

Press 

 until the 

 appears next to the LCD setting you want to change, and then press

.

Press 

 to increase the brightness or contrast, or press 

 to decrease the brightness or contrast.

When the adjustment is complete, press 

.

This saves this setting as the new user default, and the printer returns to Ready.

Since many people could be using the printer, an administrator may choose to lock the operator panel menus to keep 
others from changing menu settings from the operator panel.

To disable the operator panel menus so that changes cannot be made to the printer default settings:

Turn the printer off.

Note: Disabling the operator panel menus does not prevent access to Print and Hold functionality.

Press and hold 

 and 

 while turning the printer on.

Release the buttons when you see a clock.

 appears on the first line of the display.

Press 

 until the 

 appears next to Panel Menus, and then press 

.

Press 

 until the 

 appears next to Disable, and then press 

.

The following messages appear briefly: Submitting selection and Disabling Menus.

The operator panel returns to Panel Menus.

Press 

 until the 

 appears next to Exit Config Menus, and then press 

.

 appears. The menus are disabled, and the printer returns to Ready.