Brother HL-L8250CDN Service Manual page 333

1.3.25 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.
LCD
F
P
B
<Operating procedure>
Model without touch panel
(1) Press the
"MAINTENANCE 78" on the LCD in the
initial state of the maintenance mode.
Then, press the OK key. "F100 P100
B100" is displayed on the LCD, and all
the fans operate at the rotating speed
of 100%.
(2) Press the Go 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 Go key. "F0 P 0 B 0" is
displayed on the LCD, and all the fans
stop.
(4) Press the Cancel key to return the
machine to the initial state of the
maintenance mode.
■
Location of fans
Power fan
Parts name
Fuser fan
Power fan
Blower
or key to display
Fuser fan
Evacuate hot air of the fuser unit.
Evacuate hot air of the low-voltage power supply
PCB unit.
Intake air to prevent a dirt on the corona wire.
Model with touch panel
(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 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 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.
Fig. 5-17
5-50
Description
Blower
Confidential