48Maintenance of the unit [Maintenance]System log check, firmware upgrade, and initialization of the setup menu can be performed on this page.The "Maintenance" page has 3 tabs of the [System log] tab, the [Upgrade] tab and the [Initialization] tab.Check the system log [System log]Click the [System log] tab of the "Maintenance" page.Up to 320 KB (approx. 4 000 logs) or more system logs can be saved on the SD memory card when the SD memorycard is inserted after selecting "Use" for "SD memory card" on the [SD memory card] tab ( page 21).When "Not use" is selected for "About the SD memory card", up to 8 KB (approx. 100 logs) or more system logs canbe saved on the built-in memory of the unit.When the saved system logs have reached the capacity, the newer logs will overwrite the older system logs.The system logs will be displayed in 100 logs each.When using the SD memory card, the logs will be saved even when the power of this unit is turned off. When notusing the SD memory card, the logs will be deleted when the power of this unit is turned off.80 KB of system log is periodically overwritten every 5 minutes.Considering the system log occurs periodically, it is recommended to maintain the SD memory card approx. 5 MB ormore.• When using the SD memory card, saving the system logs will be stopped when the SD memory card becomesfull.In this case, format the SD memory card. Or make the remaining space on the SD memory card, select "Not use"for "SD memory card" on the [SD memory card] tab ( page 21), and select "Use" again.(To notify that the SD memory card becomes full, perform the Panasonic alarm protocol setup. ( page 36)[Time & date]Time and date at the error occurrence will be displayed.[Error message]The descriptions about the error will be displayed.Refer to page 51 for further information about the sys-tem logs.