• Code: 990.00
• Description: General device equipment check Indicates an equipment check condition has occurred in the specified device, but the device is unable to identify the exact component failure.
• Remedy: Service errors 980 thru 984 <device> can be one of the following: system board, duplex, tray x (1, 2, 3, 4, or 5), envelope feeder or output bin.

• Code: 991.00
• Description: Device system card failed basic assurance test The specified device has detected an equipment check in its system card.
• Remedy: Service errors 980 thru 984 <device> can be one of the following: system board, duplex, tray x (1, 2, 3, 4, or 5), envelope feeder or output bin.