Operational Check Of Lcd (Function Code 12) - Brother HL-4140CN Service Manual

1.4.4

Operational check of LCD (Function code 12)

<Function>
This function allows you to check whether the LCD on the control panel works normally.
<Operating procedure>
(1) Press the
the maintenance mode. Then, press the OK button.
(2) Each time you press the Go button, the LCD cycles through the displays as shown below.
(3) Press Cancel button in any process of the display cycle. The printer returns to the initial
state of the maintenance mode.
<Display 1>
Backlight
LCD
Data LED
Error LED
<Display 2>
Backlight
LCD
Data LED
Error LED
<Display 3>
Backlight
LCD
Data LED
Error LED
<Display 4>
Backlight
LCD
Data LED
Error LED
or button to display "MAINTENANCE 12" on the LCD in the initial state of
: OFF
: Display of all dots
: Green blinking
: Red blinking
: OFF
: Display of 16 dots in
2 lines
: Green blinking
: Red blinking
: OFF
: Display of no dots
: Green blinking
: Red blinking
: ON
: Display of no dots
: Green blinking
: Red blinking
Display 1
Display 2
Display 3
Display 4
5-8
Fig. 5-3
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