IBM 7985 Problem Determination And Service Manual

v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 4, “Parts listing, System x3655, Type 7985 and 7943,” on page 93 to determine whichcomponents are customer replaceable units (CRU) and which components are field replaceable units(FRU).v If an action step is preceded by “(Trained service technician only),” that step must be performed only by atrained service technician.Error code Description Action166-412-001 System Management: FailedI 2C bus failure. 1. Disconnect all power cords and external cablesfrom the server, wait 30 seconds, reconnect thepower cords and cables, and retry the test.2. Update the BMC firmware to the latest level.3. Reseat the power backplane.4. Replace the following components one at a time,in the order shown, restarting the server eachtime:a. (Trained service technician only) Powerbackplaneb. (Trained service technician only) Systemboard166-414-001 System Management: FailedI 2C bus failure. 1. Disconnect all power cords and external cablesfrom the server, wait 30 seconds, reconnect thepower cords and cables, and retry the test.2. Update the BMC firmware to the latest level.3. Reseat the hard disk drive cable.4. Replace the following components one at a time,in the order shown, restarting the server eachtime:a. (Trained service technician only) Hard diskdrive backplaneb. (Trained service technician only) Systemboard166-415-001 System Management: FailedI 2C bus failure. 1. Disconnect all power cords and external cablesfrom the server, wait 30 seconds, reconnect thepower cords and cables, and retry the test.2. Update the BMC firmware to the latest level.3. Reseat the operator information panel cable.4. Replace the following components one at a time,in the order shown, restarting the server eachtime:a. Operator information panel assemblyb. (Trained service technician only) Systemboard180-xxx-000 Diagnostics LED failure. Run the diagnostics panel LED test for the failingLED.64 IBM System x3655 Type 7985 and 7943: Problem Determination and Service Guide