Lexmark CX725
990.xx
An equipment check condition occurred, but the exact component failure was not determined.
See Options communication error service check.
991.xx
An equipment check condition occurred in the controller card.
992.xx
General software error.
This article shows the primary information required to escalate error codes or messages issues.
Lexmark CX/CS8xx and XC/Cxxxx: 843.01 Error Message