NEC LT380 - Manual (Page 94)

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6. Using On-Screen Menu
[Installation]
Selecting Projector Orientation [Orientation]
This reorients your image for your type of projection. The options are: desktop front projection, ceiling rear projection,
desktop rear projection, and ceiling front projection.
Desktop front Ceiling rear
Desktop rear Ceiling front
NOTE: Selecting one of the other options than [Desktop Front] will make the [Auto Keystone] unavailable.