NEC PH1000U - To clear the lamp usage hours and the filter usage hours:

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7. Maintenance
To clear the lamp usage hours and the filter usage hours:
1. Placetheprojectorwhereyouuseit.
2. Plugthepowercordintothewalloutlet,andthenturnontheprojector.
3. Clearthelampusagehoursandthelterusagehours.
1. Fromthemenu,select[RESET]→[CLEARLAMPHOURS]andresetthelampusagehours.(→ page 138)
2. Select[CLEARFILTERHOURS]andresetthelterusagehours.(→ page 139)