Host built-in self test (BIST)Note: See “System replaceable units” on page 144 to determine which components should be replaced by a fieldservice technician.Message ActionHost fail(level-informational; built-in self-test for thehost failed)1. Reseat the microprocessor.2. Reseat the VRM.3. Replace the microprocessor CPU.Bus fault messagesNote: See “System replaceable units” on page 144 to determine which components should be replaced by a fieldservice technician.Bus fault messages ActionFailure reading 12C device.Check devices on bus 0. 1. If installed, reseat the I2C cable between Remote SupervisorAdapter and system board.2. Memory DIMMs.3. System board.Failure reading 12C device.Check devices on bus 1. 1. Reseat the I2C cable between the operator information paneland system board.2. Operator information panel.3. System board.Failure reading 12C device.Check devices on bus 2. 1. Reseat the cable between system board and the power supply(power cage assembly, if installed).2. Power cage assembly, if installed.3. Power supply.4. System board.Failure reading 12C device.Check devices on bus 3. 1. Reseat the cable between the DASD backplane and connectorof system board.2. DASD backplane.3. System board.Failure reading I2C device.Check device on bus 4. v System boardChapter 6. Symptom-to-FRU index 139
