Operational Check Of Fans (Function Code 78) - Brother HL-4140CN Service Manual

1.4.22 Operational check of fans (Function code 78)

<Function>
This function is to check whether each of fans is operating correctly or not. The operation of
the following fan is checked respectively, and their operating states (rotation speed 100 %,
rotation speed 50 %, or OFF) are displayed.
LCD Parts name
F Fuser fan
P Power fan
B
<Operating procedure>
(1) Press the
the maintenance mode. Then, press the OK button.
(2) Press the Go button to check the next term. For operation check, spin or stop fans
actually on each term.
(3) Press Cancel button in any process of the display cycle. The printer returns to the initial
state of the maintenance mode.
Power fan
Evacuate hot air of the fuser unit.
Evacuate hot air of the low-voltage power supply PCB ASSY.
Blower Intake air to prevent a dirt on the corona wire.
or button to display "MAINTENANCE 78" on the LCD in the initial state of
Fuser fan
Description
Fig. 5-15
Exhaust
Exhaust
Intake
Fig. 5-16
5-42
Blower
Confidential