Operational Check Of Lcd (Function Code 12) - Brother HL-4040CN, HL-4050CDN, HL-4070CDW 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 machine returns to the initial
stage of the maintenance mode.
Backlight
Data LED
Direct Print LED
Backlight
Data LED
Direct Print LED
Backlight
Data LED
Direct Print LED
or button to display "MAINTENANCE 12" on the LCD in the initial stage of
: Orange lighting
: Orange blinking
: Blue blinking
: Red lighting
: Orange blinking
: Blue blinking
: Green lighting
: Orange blinking
: Blue blinking
<Display 1>
< Display 2>
< Display 3>
Fig. 5-3
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