Check Lcd Operation (Function Code 12) - Brother HL-2290 Service Manual

1.3.5 Check LCD operation (Function code 12)

<Function>
This function is used to check that the LCD on the control panel is operating normally.
<Operating Procedure>
(1) Press the [▲] or [▼] in the initial state of maintenance mode to display "MAINTENANCE
12" on the LCD, and press the [OK].
(2) Each press of the [Go] cycles through the displays as shown in the figure below.
(3) When you press and hold the [Go] for five seconds, the machine returns to the initial
state of maintenance mode, regardless of the display status.
China model
Display 1
Display 2
Display 3
Display 4
Display 5
Displays "C"
Displays all dots
Displays 16 frames in a line
Displays Lattice
Displays no dots
Non-China model
Display 1
Display 2
Display 3
Display 4
Display 5
Fig. 5-3
5-13
Displays " "
Displays all dots
Displays 16 frames in a line
Displays Lattice
Displays no dots
Confidential