HL-1850/1870N SERVICE MANUAL
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9.2 Sensor Check Mode
The sensor check mode is used to check if the sensors in the printer are functioning correctly.
In the process of this inspection, the Data LED and the control panel switches are also
checked.
On entering this mode, the LCD display shows the status of the respective sensors as shown
in the figure below;
Left
Right
CTPEDSMRFGL2FRE
Fig. 6-37
There are 15 sensors to be checked. The letters above represent the respective sensors and
are displayed in the specific place on the LCD display when the sensor is ON, and the black
square box appears when the sensor is OFF. Refer to the table in the next page for identifying
status of sensors:
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