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Confidential
1.4.26 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 fans is checked respectively, and their operating states (rotation speed 100 %,
rotation speed 50 %, or OFF) are displayed.
<Operating procedure>
(1) Press the 7 and 8 buttons in this order in the initial state of the maintenance mode.
The indication will appear on the LCD as shown in the figure below.
(2) Press the Start/Black button to check the next item. For operation check, spin or stop
fans actually on each item.
(3) Press the Stop/Exit button so that the machine stops checking the fans, beeps for one
second and returns to the initial state of the maintenance mode.
Fig. 7-22
â– Location of fans
Fig. 7-23
LCD Parts name Description
FU Main fan Evacuate hot air of the fuser unit.
PS LV fan Evacuate hot air of the Low-voltage power supply PCB.
LV fan
Main fan
Exhaust
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