Acer P1623 - Manual (Page 61)

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Problems with the Projector
11 Image is reversed • Select "Image" > "Projection Mode", "Image" >
"Projection Location" on the OSD and adjust the
projection direction.
# Condition Solution
1 The projector stops responding
to all controls
If possible, turn off the projector, then
unplug the power cord and wait at least 30
seconds before reconnecting power.
2 Lamp burns out or makes a
popping sound
When the lamp reaches the end of its useful
life, it will burn out and may make a loud
popping sound. If this happens, the projector
will not turn on until the lamp module has
been replaced. To replace the lamp, contact
your local dealer or Acer service center.