Lexmark T522 Service Manual - Page 71

4520-xxx Dead Machine Service Check Note: If a high-capacity input tray is installed, remove the option and check the base printer for correct operation. If the base printer operates correctly, go to "High-Capacity Feeder Input Tray Service Check" on page 2-66. If the base printer continues to not operate correctly, remove any other attached paper handling options. Observe all necessary ESD precautions when removing and handling the controller board, engine board or any of the installed option cards or assemblies. Note: If the LVPS is blowing fuses, remove the LVPS from the printer. Check the metal LVPS shield for signs of damage that causes the shield to touch components on the LVPS board assembly. FRU 1 Line Voltage 2 AC Line Cord 3 +5 V dc at any Option Connector 4 +5 V dc at the controller board test point 5 +5 V dc at the engine board Test Point 6 LVPS Fuse F1 Action Check the AC line voltage. If the line voltage is incorrect, inform the customer. Check the line cord for any signs of damage. If correct, check the continuity of the line cord and replace if necessary. Check for +5 V dc on any of the option connectors. The easiest to access is the envelope feeder connector located behind the lower front door. If +5 V dc is present at any of the connectors, go to step 9. If +5 V dc is not present, go to step 4. Check for +5 V dc at the +5 V dc test pad located on the controller board. If correct, go to step 9. Check for +5 V dc at the +5 V dc test point on the engine board. If correct, replace the engine board. If incorrect, go to step 6. Remove the LVPS from the printer and check fuse F1. Replace the fuse, if blown. Diagnostic Information 2-43