Toshiba TDP-P4 Service Manual page 61

Resetting the lamp timer
To reset the lamp hour counter in the Status menu, do the following:
1 Press and hold the resync button.
2 While holding the resync button down, press the menu button for 10 seconds.
3 To verify that the counter was reset, press the menu button, then navigate to the Status menu.
The lamp counter is at the top of the list.
TDP-P4 Service Manual 61