NEC WT615 User Manual page 143

6. Reattach the lamp cover.
7. Tighten the lamp cover screw.
Be sure to tighten the screw.
8. After you install a new lamp, select the menu [Reset] → [Clear Lamp Hour Meter] to clear the Remaining
Lamp Time and the Lamp Hour Meter.
NOTE: When the lamp exceeds 2100 hours (up to 4100 hours in Eco mode) of service, the projector cannot turn on and the
menu is not displayed. If this happens, press the HELP button on the remote control for a minimum of 10 seconds while in
standby mode. When the lamp time clock is reset to zero, the LAMP indicator goes out.
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7. Maintenance