Check Lcd Operation (Function Code: 12) - Brother HL-L2300D Service Manual

1.3.4 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 [▼] key in the initial state of maintenance mode to display
"MAINTENANCE 12" on the LCD, and press the [OK] key.
(2) Each press of the [Go] key cycles through the displays as shown in the figure below.
(3) When you press and hold the [Go] key, the machine returns to the initial state of
maintenance mode, regardless of the display status.
<Display 1>
Back light: OFF
LCD: Displays all dots
<Display 2>
Back light: OFF
LCD: Displays 16 frames
in a line
<Display 3>
Back light: OFF
LCD: Displays no dots
Display 1
Display 2
Display 3
Fig. 5-3
5-11
Confidential