Lexmark T520 Service Manual page 60

Infoprint 1120 and 1125
Check Device Connection Messages
The messages in the following table display when the printer looses
communications with one of the following devices.
User Status Message
Check Env Feeder
Connection
Check Tray X
Connection
Check Duplex
Connection
The messages in the following table can occur in two ways. The
specified device could have been removed from the printer, for
instance to clear a paper jam. Otherwise, the device can still be
attached to the printer, but is experiencing a communications
problem, not fully connected, or having a hardware failure.
If the device is temporarily removed or not connected properly, then
reattach it. When the option is recognized, the printer automatically
clears the error and continues. If the option is experiencing a
hardware problem, turn the printer off and back on. If the error
occurs again, turn the printer off, remove the option and call for
service.
Explanation
Check Envelope Feeder Connection.
Check Tray X (X=1,2,3,4 or 5).
Check Duplex Unit Connection.
Diagnostic Information
2-33