Check Fan Operation (Function Code: 78) - Brother HL-5440D Service Manual

1.3.18 Check fan operation (function code: 78)

<Function>
This function is to check that the main fan is operating normally. The rotation speed is
changed among three settings: 100%, 50% and OFF.
<Operation Procedure>
(1) Press the [
"Maintenance 78" on the LCD.
(2) Press the [OK] button. "F 100" is displayed on the LCD, and the main fan operates at
100% rotation speed.
If the main fan is faulty, "NG" is displayed on the LCD.
(3) Press the [Go] button. "F 50" is displayed on the LCD, and the main fan operates at 50%
rotation speed.
(4) Press the [Go] button. "F 0" is displayed on the LCD, and the main fan stops.
(5) Press the [Go] button. "F 100" is displayed on the LCD, and the status returns to step
(2).
Each press of the [Go] button repeats from steps (2) to (4).
(6) When the [Cancel] button is pressed, the machine returns to the initial state of
maintenance mode.
] or [ ] button in the initial state of maintenance mode to display
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