Description: HCIT tray lift motor PWM underflow error
Remedy: 1. Check for obstruction in the HCIT tray lift area. 2. Check the connections on the HCIT tray lift motor assembly for proper connection. 3. Replace the HCIT tray lift motor drive motor assembly if problem remains.
Code: 990.90
Description: Sensor connection failure Hardware error (sensors are not plugged on the board)
Remedy: Replace all connections on the system card assembly.
Code: 991.00
Description: System card failure Device system card failed basic assurance test.