Panasonic PT-L720U manual Before calling for service

Before calling for service

Before calling for service, check the following points.

Problem	Possible cause
Power does not	BThe power cord may not be connected.
turn on.	BThe MAIN POWER switch is turned off.
	BThe main power supply is not being supplied to the
	wall outlet.
	BTEMP indicator is illuminated or flashing. (Refer to
	page 46.)
	BLAMP indicator is illuminated or flashing. (Refer to
	page 47.)
	BThe lamp unit cover has not been securely
	installed.
No picture appears.	BThe video signal input source may not be
	connected properly.
	BThe input selection setting may not be correct.
	(Refer to page 26.)
	BThe BRIGHT adjustment setting may be at the
	minimum possible setting. (Refer to page 35.)
	BThe shutter function may be in use. (Refer to page
	42.)
The picture is	BThe lens cover may still be attached to the lens.
fuzzy.	BThe lens focus may not have been set correctly.
	(Refer to page 27.)
	BThe projector may not be at the correct distance
	from the screen. (Refer to page 25.)
	BThe lens may be dirty.
	BThe projector may be tilted too much. (Refer to
	page 24.)
COLOR is too light or	BCOLOR or TINT adjustment may be incorrect.
TINT is poor.	(Refer to page 35.)
	BThe input source which is connected to the
	projector may not be adjusted correctly.
No sound can be	BThe audio signal source may not be connected
heard.	properly.
	BThe volume adjustment may be at the lowest
	possible setting. (Refer to pages 15 and 28.)
	BA cable may be connected to the AUDIO OUT
	jack.

Problem	Possible cause
The remote control	BThe batteries may be weak.
unit does not	BThe batteries may not be inserted correctly. (Refer
operate.	to page 20.)
	BThe remote control signal receptor on the projector
	may be obstructed. (Refer to page 20.)
	BThe remote control unit may be out of the
	operation range. (Refer to page 20.)
The buttons on the	BThe CONTROL KEY may be set to “OFF”. (Refer
projector do not	to page 42)
function.	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.
The picture does not	BThe signal format (TV system) may not be set
display correctly.	correctly. (Refer to page 35.)
	BThere may be a problem with the video tape or
	other signal source.
	BA signal which is not compatible with the projector
	may be being input. (Refer to page 56.)
Picture from	BThe cable may be too long.
computer does not	BThe external video output for the laptop computer
appear.	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.)
	BIf an RGB input indicator (refer to pages 14 and
	17) is turned off, the video signals may not be
	output from the computer.
	BRGB2 SELECT in the OPTION1 menu is set to
	OUTPUT when the signals are input to RGB2 IN /
	RGB1 OUT connector. (Refer to page 40)

Others

52 53