Panasonic PT-L720U User Manual

Before calling for service, check the following points.

B The power cord may not be connected.
B The MAIN POWER switch is turned off.
B The main power supply is not being supplied to the

wall outlet.

B TEMP indicator is illuminated or flashing. (Refer to

page 46.)

B LAMP indicator is illuminated or flashing. (Refer to

page 47.)

B The lamp unit cover has not been securely

installed.

B The video signal input source may not be

connected properly.

B The input selection setting may not be correct.

(Refer to page 26.)

B The BRIGHT adjustment setting may be at the

minimum possible setting. (Refer to page 35.)

B The shutter function may be in use. (Refer to page

42.)

B The lens cover may still be attached to the lens.
B The lens focus may not have been set correctly.

(Refer to page 27.)

B The projector may not be at the correct distance

from the screen. (Refer to page 25.)

B The lens may be dirty.
B The projector may be tilted too much. (Refer to

page 24.)

B COLOR or TINT adjustment may be incorrect.

(Refer to page 35.)

B The input source which is connected to the

projector may not be adjusted correctly.

B The audio signal source may not be connected

properly.

B The volume adjustment may be at the lowest

possible setting. (Refer to pages 15 and 28.)

B A cable may be connected to the AUDIO OUT

jack.

B The batteries may be weak.
B The batteries may not be inserted correctly. (Refer

to page 20.)

B The remote control signal receptor on the projector

may be obstructed. (Refer to page 20.)

B The remote control unit may be out of the

operation range. (Refer to page 20.)

B The CONTROL KEY may be set to “OFF”. (Refer

to page 42)
In order to set the CONTROL KEY to “ON” without
using the remote control unit, keep holding down
the ENTER button on the projector and press the
MENU button for more than 2 seconds. It will then
be turned ON.

B The signal format (TV system) may not be set

correctly. (Refer to page 35.)

B There may be a problem with the video tape or

other signal source.

B A signal which is not compatible with the projector

may be being input. (Refer to page 56.)

B The cable may be too long.
B The external video output for the laptop computer

may not be set correctly.
(You may be able to change the external output
settings by pressing the [Fn]+[F3] or [Fn]+[F10]
keys simultaneously. The actual method varies
depending on the type of computer, so refer to the
documentation provided with your computer for
further details.)

B If an RGB input indicator (refer to pages 14 and

17) is turned off, the video signals may not be
output from the computer.

B RGB2 SELECT in the OPTION1 menu is set to

OUTPUT when the signals are input to RGB2 IN /
RGB1 OUT connector. (Refer to page 40)