Thesehistoricaldataareusedtodeterminethetimingwhentheopticalpick-upistobereplaced.Whenthe opticalpick-upwasreplaced,performthisoperationtoclearhistoricaldata. [Operatingmethod] 1)Press[lAMSL](MD)knobwhen“opchange”isdisplayed. 2)Thedisplaywillchangeto“opchang?”,andthenpress[YES]button. Theoperationisove...