Brother MFC-L8850CDW - Page 445

5-61
Confidential
1.3.32 Operational check of fans (Function code 78)
<Function>
This function is used to check that each fan is operating normally. The rotation speed is
changed among three settings: 100%, 50% and OFF
<Operating procedure>
(1) Press the 7 and 8 keys in this order in the initial state of the maintenance mode.
“F100 P100 B100” is displayed on the LCD, and all the fans operate at the rotating speed
of 100%.
(2) Press the Mono Start key. “F50 P 0 B 0” is displayed on the LCD, and the fuser fan only
operates at the rotating speed of 50%.
(3) Press the Mono Start key. “F0 P 0 B 0” is displayed on the LCD, and all the fans stop.
(4) Press the X key to return the machine to the initial state of the maintenance mode.
■ Location of fans
Fig. 5-21
LCD Parts name Description
F Fuser fan Evacuate hot air of the fuser unit.
P Power fan Evacuate hot air of the low-voltage power supply
PCB unit.
B Blower Intake air to prevent a dirt on the corona wire.
Fuser fan
Power fan
Blower