. OPERATION DETAILED CONTROLS AND GAUGES If Any Abnormality Occurs During Operation 3 - 8 If any abn ormality occ urs during operation, th e standard sc reen BB changes to warning s creen FF-(1 ) or th e error screen E E. After disp laying warnin g screen FF-(1) for 2 s econds, the sc reen automatically changes t o warning screen FF-(2).