NEC NP-PH1400U User Manual page 209

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 filter usage hours.
1. From the menu, select [RESET] → [CLEAR LAMP HOURS] and reset the lamp usage hours. (→ page 142)
2. Select [CLEAR FILTER HOURS] and reset the filter usage hours. (→ page 143)
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7. Maintenance