Sensor (Media Out); Remaining Media Volume Detection; Sensor (Media Level) - Lexmark W850n Service Manual

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If media out is detected during printing, print operation of the next media is stopped. However, when the printer
is operating in the Auto Tray Select mode and there is media of the same size in another tray, media is
automatically fed out of the tray.

Sensor (media out)

Detects whether media is present in the HCF media tray.
When this sensor (media out) is off while the tray is at the feeding position, the presence of media is detected.

Remaining media volume detection

This function determines the media volume remaining in the HCF media tray by using the HCF feed lift motor
rotation time and the sensor (media level) on timing during the tray lifting time. The printer notifies operators of
remaining media volume as 25%, 50%, 75%, full, or 0 (zero).
If the remaining media volume becomes zero before no media is detected, the indication remains at (25%).
When the sensor (media level) detects no media, the indication becomes (0) (zero).
When a fault occurs, determination of remaining media volume is carried out as shown below.
•
When the interlock is open during lifting operation, the remaining media volume is determined based on
the total of the time until Interlock open + the time from the media feed lift motor forward/reverse rotation
until the sensor (media level) comes on.
•
When the power is turned off and on during lifting operation the remaining media volume is determined by
the lifting time after power on. (The actual volume of media in the tray may differ from the indication.)
•
When the power is turned off and on while the tray is at the feeding position, the level sensor is on when
the power is turned on, and the remaining media volume before the previous power off is regarded as the
remaining media volume at that time.
•
If the sensor (media level) is off when the power is turned on, the HCF regards the HCF media tray as
having been removed, and determines the remaining media volume based on the time from the media feed
lift motor forward/reverse rotation until the sensor (media level) comes on.

Sensor (media level)

Detects the media feeding position in the tray to control the media position.
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