5-45
Confidential
Maintenance mode functions for service personnel
1.4.5 Check sensor operation
This function is used to check whether the sensors, electromagnetic clutch, and motors are
operating normally. While sensor operation is being checked, the Ready LED flashes once
each time the sensor or switch status changes from ON to OFF or OFF to ON.
<Operating Procedure>
(1) Open the front cover while the power switch is turned OFF.
(2) Press and hold the [Go], and turn ON the power switch. The Toner, Drum, and Paper
LEDs light.
(3) Release the [Go]. All LEDs go out.
(4) Press the [Go]. The Toner, Drum, and Paper LEDs light.
(5) Press the [Go] again. Toner, Drum, and Paper LEDs go out in a second.
Activate the sensors, electromagnetic clutch, and motors shown in the figure below, and
check that the Ready LED flashes. When the status changes consecutively, the Ready LED
also flashes consecutively. Toner LED lights after completing all checks.
Fig. 5-13
New toner sensor PCB ASSY
Interlock SW lever
Registration rear actuator
Registration front
actuator
Paper feed sensor
PCB ASSY
Paper feed actuator
Eject sensor PCB ASSY
Back cover/duplex
tray sensor
Front cover sensor
Eject actuator
New toner actuator
Registration front/rear
sensor PCB ASSY
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