Status Monitoring; Static Media Jam Detection; Interlock Detection - Lexmark X850e Service Manual

7500-XXX

Status monitoring

This function includes detection of static media jams, interlocking, and insertion of the HCF media tray
assembly.

Static media jam detection

This function checks the status of all relevant sensors on the media path to detect media jams. When media is
present on the sensor, it is treated as a static jam. This detection of media jam is carried out during the start-up
procedure and at every jam/fail detection. The status of all relevant sensors are checked during the start-up
procedure. In addition, the sensor states are checked constantly for the jam/fail detection in order to monitor the
variation in sensor levels.

Interlock detection

This function checks the open state of the switch (top door interlock) and the switch (HCF unit docking interlock).
This detection is constant while the power is on.
When open, the switch (top door interlock) is detected, printing operation is inhibited, and the 24 V supply to the
media feed lift motor and the transport motor is shut off. When open, the switch (HCF unit docking interlock) is
detected, and transfer of media from the HCF is inhibited.
Switch (HCF top door interlock)
Switch (HCF unit docking interlock)
1-15
General information