Dell 5230dn Mono Laser Printer Service Manual - Page 153
capacity input tray HCIT, tray lift drive motor assembly, removal on System card,
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Error code or message 990.54 Error contents HCIT tray lift motor lost encoder failure 990.90 991.00 Sensor connection failure System card failure 991.05 Checksum failure Description/Action Possible repair actions The HCIT tray lift motor is not reporting pulses back to the engine. Hardware error (sensors are not plugged on the board) Device system card failed basic assurance test. Bad checksum 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 drive motor assembly if problem remains. Go to "High capacity input tray (HCIT) tray lift drive motor assembly removal" on page 4-126 Replace all connections on the system card assembly. Replace the system card assembly. Go to "System card assembly removal" on page 4-76. Replace the system card assembly. Go to "System card assembly removal" on page 4-76. Diagnostic information 2-119