Dell 2150cn/cdn Color Laser Printer - Manual (Page 312)

310 Understanding the Printer Menus
To specify whether to print on both sides when using letterhead.
Values:
Low Toner Msg
Purpose:
To specify whether to show the alert message when the toner is low.
Values:
Maintenance
Use the Maintenance menu to initialize the NV (non-volatile) memory,
configure the plain paper quality adjustment settings, and configure the security
settings.
NOTE: Values marked by an asterisk (*) are the factory default menu settings.
F/W Version
Purpose:
To confirm the current F/W version.
Service Tag
Purpose:
To confirm the service tag.
Express Code
Purpose:
To confirm the express service code.
Disable * Does not print on both sides of letterhead.
Enable Prints on both sides of letterhead.
Off Does not show the alert message when the toner is low.
On * Shows the alert message when the toner is low.