Lexmark E260dn Service Manual page 61

Device equipment check or device controller board error
Indicates a failure with the device's equipment or controller board.
Lights
Service secondary codes: 99x
Service tertiary codes: device equipment check or device controller board error
990: Service device equipment
check
991: Service device controller
board failure ✷
4513-220, -230
✷
✷
2-35
Diagnostics information