Lenovo ThinkPad 360 Hardware Maintenance Manual - Page 212
System Programs in Flash Memory, Flash Memory Update, See Error Log - cmos battery
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3. Power-off the computer and remove the IC DRAM card, or DIMM card from its slot (if installed). 4. Press and hold the F1 key; then power-on the computer. Hold the F1 key down until Easy-Setup screen appears. 5. Select Test and press enter. 6. Select Memory and press enter to run the memory test on base memory. If an error appears, replace the system board. 7. Power-off the computer and reinstall the IC DRAM card; then power-on the computer. Verify the memory size; then test the memory. If an error appears, replace the IC DRAM card. If memory problems occur intermittently, use the loop option to repeat the test. When the test detects an error, an error log is printed on the printer connected to the parallel port. See "Error Log" on page 229 for more information. If a parity error is logged in CMOS, POST error code 118 appears when the power is turned on. To clear the log and to test the memory, run the memory diagnostic. If no error is detected by the test, the log is cleared, and error code 118 will not appear the next time the POST is run. If the 118 error code occurs repeatedly, determine and replace the failing memory FRU. FRUs should not be replaced because of a single, un-reproducible failure. Single failures can occur from a variety of reasons that have nothing to do with a hardware defect such as: cosmic radiation, electrostatic discharge, or software errors. FRUs replacement should only be considered when a recurring problems exits. If this is suspected, clear the error log and run the test again. Do not replace any FRUs if log errors do not reappear. System Programs in Flash Memory: System setup programs and diagnostic tests are stored in Flash memory. Flash Memory Update: A flash memory update is required for the following conditions: New versions of system programs. New feature or options are added. When Updating Flash Memory Do not power-off the computer, disconnect the Vac power, or remove the battery during the Flash update. On certain systems, updating Flash memory can reset all customer's configuration settings to the default values. To update the Flash memory, perform the following steps: 1. Connect the AC Adapter and install the battery pack. 202 IBM Mobile Systems HMM