Lenovo ThinkPad 385D TP 380Z Hardware Maintenance Manual (August 1998) for use - Page 6
Screw Tightening Information, How to Use Error Messages, Port Replicator Problems
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Screw Tightening Information Loose screws can cause a reliability problem. The IBM ThinkPad computer addresses this problem with nylon-coated screws. Tighten screws as follows: Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part: Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card: Torque driver If you have a torque driver, refer to the "Torque" instruction with each step. How to Use Error Messages: Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever caused the first error code can result in false error codes being displayed. If no error code is displayed, see if the error symptom is listed in the "Symptom-to-FRU Index" on page 23. Port Replicator Problems: If you suspect a problem with the port replicator, see "Port Replicator Checkout" on page 18. How to Diagnose Multiple FRUs: When the adapter or the device has more than one FRU, the error code could be caused by any of them. Before replacing multiple FRUs, try removing or exchanging each FRU, one by one in the designated sequence, to see if the symptoms change. 4