NEC Lt280 Portable Projector Users Manual

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6. Using On-Screen Menu
 Menu Descriptions & Functions [Reset]
Returning to Factory Default
The Reset feature allows you to change adjustments and settings to the factory preset for sources by the following
methods:
[Current Signal]
Resets the adjustments for the current signal to the factory preset levels.
All the items in [Adjust] can be reset.
[All Data]
Reset all the adjustments and settings for all the signals to the factory preset except [Entry List], [Language],
[Background], [Control Panel Lock], [Menu Lock], [Logo Lock], [Security], [LAN Mode], [Projector Name], [Commu-
nication Speed], [Standby Mode], [Lamp Life Remaining], [Lamp Hours Used], [Filter Hours Used] and [Projector
Hours Used].
[All Data (Including Entry List)]
Reset all the adjustments and settings for all the signals to the factory preset except [Language], [Background],
[Control Panel Lock], [Menu Lock], [Logo Lock], [Security], [LAN Mode], [Projector Name], [Communication Speed],
[Standby Mode], [Lamp Life Remaining], [Lamp Hours Used], [Filter Hours Used] and [Projector Hours Used].
Also deletes all the signals in the [Entry List] and returns to the factory preset.
NOTE: Locked signals in Entry List cannot be reset.
Clearing Lamp Hour Meter [Clear Lamp Hours]
Resets the lamp clock back to zero.
NOTE: Elapsed time of the lamp use will not be affected even when [Reset] is done from the menu.
NOTE: The projector will turn off and go into standby mode after 2100 hours (up to 3100 hours in Eco mode) of service. In this
condition you cannot clear the lamp hour meter on the menu. If this happens, press the HELP button on the remote control for 10
seconds to reset the lamp clock back to zero. Do this only after replacing the lamp.
Resetting the Filter Usage Hours [Clear Filter Hours]
Resets the filter usage back to zero.
NOTE: Elapsed time of the filter use will not be affected even when [Reset] is done from the menu. 
						

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7. Maintenance
SELECT
This section describes the simple maintenance procedures you should follow to clean the filter and replace the lamp.

 Cleaning or Replacing the Filter
The air-filter sponge keeps dust and dirt from getting inside the projector and should be cleaned after every 100 hours
of operation (more often in dusty conditions). If the filter is dirty or clogged, your projector may overheat.
CAUTION
•Turn off the projector, turn off the main power switch and unplug the projector before replacing the filter.
•Only clean the outside of the filter cover with a vacuum cleaner.
•Do not attempt to operate the projector without the filter cover.
To clean the air-filter:
Vacuum the filter-through the filter cover.
To reset the filter usage time, from the menu, select [Reset] → [Clear Filter Hours].
(→ page 101 for resetting the filter usage time)
To replace the filter (sponge):
1. Remove the filter cover by pushing down on the catch of the cover until you feel it detach.
Catch
2. Gently peel off the filter (sponge) and replace it with the new one.
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SELECT 
						

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7. Maintenance
3. Reinstall the new filter cover.
NOTE: Do not wash the filter with soap and water. Soap and water will damage the filter membrane. Before replacing the filter,
remove dust and dirt from the projector cabinet. Keep out dust and dirt during filter replacement.
NOTE: When you replace the lamp, it is also wise to replace the filter. The filter comes in the same package with your replacement
lamp.
 Cleaning the Cabinet and the Lens
1. Turn off the projector before cleaning.
2. Clean the cabinet periodically with a damp cloth. If heavily soiled, use a mild detergent. Never use strong
detergents or solvents such as alcohol or thinner.
3. Use a blower or lens paper to clean the lens, and be careful not to scratch or mar the lens.
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7. Maintenance
 Replacing the Lamp
After your lamp has been operating for 2000 hours (up to 3000 hours in Eco mode) or longer, the LAMP indicator in the
cabinet will blink red and the message [The lamp has reached the end of its usable life. Please replace the lamp.]
will appear. Even though the lamp may still be working, replace it at 2000 (up to 3000 hours in Eco mode) hours to
maintain optimal projector performance. After replacing the lamp, be sure to clear the lamp hour meter. (→ page 101)
CAUTION
•DO NOT TOUCH THE LAMP immediately after it has been used. It will be extremely hot. Turn the projector off, wait
30 seconds, turn off the main power switch and then disconnect the power cable. Allow at least one hour for the
lamp to cool before handling.
•DO NOT REMOVE ANY SCREWS except two lamp case screws. You could receive an electric shock.
•Do not break the glass on the lamp housing.
Keep finger prints off the glass surface on the lamp housing. Leaving finger prints on the glass surface might cause
an unwanted shadow and poor picture quality.
•The projector will turn off and go into standby mode after 2100 (up to 3100 hours in Eco mode) hours of service. If
this happens, be sure to replace the lamp. If you continue to use the lamp after 2000 hours (up to 3000 hours in
Eco mode) of use, the lamp bulb may shatter, and pieces of glass may be scattered in the lamp case. Do not touch
them as the pieces of glass may cause injury. If this happens, contact your NEC dealer for lamp replacement.
To replace the lamp:
 Optional lamp and tools needed for replacement:
•Replacement lamp VT75LP
•Phillips screwdriver or equivalent
1. Place the projector on a soft cloth and turn it over to access the lamp cover on the bottom.
1
1
2
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2. Use a Philips screwdriver to push and release the tab.
Push up and remove the lamp cover. 
						

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7. Maintenance
3. Loosen the two screws securing the lamp housing until the phillips screwdriver goes into a freewheeling
condition. The two screws are not removable.
Remove the lamp housing by holding it.
NOTE: There is an interlock on this case to prevent the risk of electrical shock. Do not attempt to circumvent this interlock.
4. Insert a new lamp housing until the lamp housing is plugged into the socket.
CAUTION
Do not use a lamp other than the NEC replacement lamp VT75LP.
Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
5. Reattach the lamp cover.
Slip the lamp cover back until it snaps into place.
Interlock 
						

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7. Maintenance
6. Connect the supplied power cable, turn on the Main Power switch and turn on the projector.
7. Finally, select the menu 
→ [Reset] → [Clear Lamp Hours] to reset the lamp usage hours.
NOTE: When the lamp exceeds 2100 hours (up to 3100 hours in Eco mode) of service, the projector cannot turn on and the menu is
not displayed.
If this happens, press the HELP button on the remote control for 10 seconds to reset the lamp clock back to zero.
When the lamp time clock is reset to zero, the LAMP indicator goes out. 
						

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8. Appendix

 Troubleshooting
This section helps you resolve problems you may encounter while setting up or using the projector.
Indicator Messages
Power Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightGreen
Orange
Green
Orange0.5 sec On,
0.5 sec Off
2.5 sec On,
0.5 sec Off
0.5 sec On,
0.5 sec OffThe main power is off
The projector is getting ready to turn on.
Off Timer is activated.
The projector is cooling down.
The projector is turned on.
The projector is in Standby.–
Wait for a moment.
–
Wait for a moment.
–
–
Status Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightRed
Green
Orange
Orange
Green1 cycle (0.5 sec On,
2.5 sec Off)
2 cycle (0.5 sec On,
0.5 sec Of)
3 cycle (0.5 sec On,
0.5 sec Off)
4 cycle (0.5 sec On,
0.5 sec Off)
6 cycle (0.5 sec On,
0.5 sec Off)
1 cycle(0.5 sec On,
2.5 sec Off)Normal
Lamp cover error
Temperature error
Power error
Fan error
Lamp error
Re-firing the lamp
Network conflict
Control Panel Lock is on
The projector is in Standby.–
Replace the lamp cover correctly.
(→ page 105)
The projector is overheated. Move
the projector to a cooler location.
Power unit will not work correctly.
Fans will not work correctly.
Lamp fails to light. Wait a full
minute and then turn on again.
The projector is re-firing.
Both the built-in LAN and the wireless
LAN cannot be connected to the same
network at the same time.
To use both built-in LAN and wireless
LAN at the same time, connect them to
different networks. (
→ page 87)
You have pressed cabinet button
when Control Panel Lock is on.
(→ page 79)
–
Lamp Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightNormal
Lamp has reached its end of life. Lamp
replacement message will be displayed.
Lamp has been used beyond its limit. The
projector will not turn on until the lamp is
replaced.
Lamp is in Eco mode Red
Red
Green–
Replace the lamp.
(→ page 104)
Replace the lamp.
(→ page 104)
– 
						

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8. Appendix
Common Problems & Solutions (→ Power/Status/Lamp Indicator on page 107)
Does not turn on
Will turn off
No picture
Color tone or hue is
unusual
Image isn’t square to
the screen
Picture is blurred
Image is scrolling
vertically, horizontally
or both
Remote control does
not work
Indicator is lit or
blinking
Vertical stripes in RGB
mode
USB mouse does not
work•Check that the power cable is plugged in and that the power button on the projector cabinet or the remote
control is on. (→ page 23, 24)
•Ensure that the lamp cover is installed correctly. (→ page 105)
•Check to see if the projector has overheated. If there is insufficient ventilation around the projector or if the
room where you are presenting is particularly warm, move the projector to a cooler location.
•Check to see if the lamp usage exceeds 2100 hours (up to 3100 hours : Eco mode). If so, replace the lamp.
After replacing the lamp, reset the lamp hours used. (→ page 101)
•The lamp may fail to light. Wait a full minute and then turn on the power again.
•Ensure that the Power Management or Off Timer is off. (→ page 94, 96)
•Use the SOURCE button on the projector cabinet or the VIDEO, the S-VIDEO, the COMPUTER 1, the COM-
PUTER 2, the COMPUTER 3 (LT380 only), COMPONENT, the VIEWER or the LAN button on the remote control
to select your source. (→ page 26)
•Ensure your cables are connected properly.
•Use menus to adjust the brightness and contrast. (→ page 71)
•Check to see if the image is muted. (→ page 34)
•Remove the lens cap.
•Reset the settings or adjustments to factory preset levels using the Reset in the Menu. (→ page 101)
•Enter your registered keyword if the Security function is enabled. (→ page 42)
•Be sure to connect the projector and notebook PC while the projector is in standby mode and before turning on
the power to the notebook PC.
In most cases the output signal from the notebook PC is not turned on unless connected to the projector be-
fore being powered up.
*If the screen goes blank while using your remote control, it may be the result of the computers screen-
saver or power management software.
•See also the next page.
•Check if an appropriate color is selected in [Wall Color]. If not, select an appropriate option. (→ page 78)
•Adjust [Hue] in [Adjust]. (→ page 71)
•Reposition the projector to improve its angle to the screen. (→ page 27)
•Use the 3DReform function to correct the trapezoid distortion. (→ page 29)
•Adjust the focus. (→ page 28)
•Reposition the projector to improve its angle to the screen. (→ page 27)
•Ensure that the distance between the projector and screen is within the adjustment range of the lens. (→ page
11)
•Condensation may form on the lens if the projector is cold, brought into a warm place and is then turned on.
Should this happen, let the projector stand until there is no condensation on the lens.
•Use the SOURCE button on the projector cabinet or the VIDEO, the S-VIDEO, the COMPUTER 1, the COM-
PUTER 2, the COMPUTER 3 (LT380 only), COMPONENT, the VIEWER or the LAN button on the remote control
to select your source (Video, S-Video, Computer, Component, Viewer or LAN). (→ page 26)
•Adjust the computer image manually with the [Clock]/[Phase] in [Adjust] → [Image Options]. (→ page 72)
•Install new batteries. (→ page 9)
•Make sure there are no obstacles between you and the projector.
•Stand within 22 feet (7 m) of the projector. (→ page 9)
•See the POWER/STATUS/LAMP Indicator. (→ page 107)
•Press the AUTO ADJUST button on the projector cabinet or the AUTO ADJ. button on the remote control. (→
page 31)
•Adjust the computer image manually with the [Clock]/[Phase] in [Adjust] → [Image Options].(→ page 72)
•Make sure that your USB mouse is properly connected to the projector.
The projector may not support some brands of a USB mouse.
Problem Check These  Items
For more information contact your dealer. 
						

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8. Appendix
If there is no picture, or the picture is not displayed correctly.
•Power on process for the projector and the PC.
Be sure to connect the projector and notebook PC while the projector is in standby mode and before turning on the
power to the notebook PC.
In most cases the output signal from the notebook PC is not turned on unless connected to the projector before
being powered up.
NOTE: You can check the horizontal frequency of the current signal in the projector’s menu under Information.  If it reads “0kHz”,
this means there is no signal being output from the computer. See page 98 or go to next step.
•Enabling the computer’s external display.
Displaying an image on the notebook PC’s screen does not necessarily mean it outputs a signal to the projector.
When using a PC compatible laptop, a combination of function keys will enable/disable the external display.  Usu-
ally, the combination of the ‘Fn” key along with one of the 12 function keys gets the external display to come on or
off.  For example, NEC laptops use Fn + F3, while Dell laptops use Fn + F8 key combinations to toggle through
external display selections.
•Non-standard signal output from the computer
If the output signal from a notebook PC is not an industry standard, the projected image may not be displayed
correctly. Should this happen, deactivate the notebook PC’s LCD screen when the projector display is in use. Each
notebook PC has a different way of deactivate/reactivate the local LCD screens as described in the previous step.
Refer to your computer’s documentation for detailed information.
•Image displayed is incorrect when using a Macintosh
When using a Macintosh with the projector, set the DIPswitch of the Mac adapter (not supplied with the projector)
according to your resolution. After setting, restart your Macintosh for the changes to take affect.
For setting display modes other than those supported by your Macintosh and the projector, changing the DIP
switch on a Mac adapter may bounce an image slightly or may display nothing. Should this happen, set the DIP
switch to the 13” fixed mode and then restart your Macintosh. After that, restore the DIP switches to a displayable
mode and then restart the Macintosh again.
NOTE: A Video Adapter cable manufactured by Apple Computer is needed for a PowerBook which does not have a mini D-Sub
15-pin connector.
•Mirroring on a PowerBook
*When using the projector with a Macintosh PowerBook, output may not be set to 1024 x 768 unless “mirroring”
is off on your PowerBook. Refer to owner’s manual supplied with your Macintosh computer for mirroring.
•Folders or icons are hidden on the Macintosh screen
Folders or icons may not be seen on the screen. Should this happen, select [View] ->[Arrange] from the Apple
menu and arrange icons. 
						

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8. Appendix
 Specifications
This section provides technical information about the projectors performance.
Model Number LT380/LT280
Optical
LCD Panel LT380: 0.8 p-Si TFT active-matrix with Micro Lens Array
LT280: 0.7 p-Si TFT active-matrix with Micro Lens Array
Resolution 1024 
 768 pixels* up to UXGA with Advanced AccuBlend
Lens Manual zoom and focus:
LT380: F1.7 - 2.0    f=24.2 - 29.0 mm
LT280: F1.7 - 2.0    f=21.6 - 25.9 mm
Lamp 200 W DC (152 W DC in Eco mode)
Image Size 21 inches - 300 inches (0.53 m - 7.62 m) diagonal
Projection Distance LT380: 2.33 - 35.89 ft / 0.71 -10.94 m
LT280: 2.36 -35.66 ft / 0.72 -10.87 m
Projection Angle LT380: 10.3° - 11.2° (wide) / 8.5° - 9.2° (tele)
LT280: 11.5° - 12.1° (wide) / 9.5° - 10.0° (tele)
Electrical
Inputs 2 Analog RGB (Mini D-Sub 15 P), 1 Digital RGB (DVI-D 24 P : LT380
only), 1 Component Y, Cb/Pb, Cr/Pr (3 RCA), 2 Component (Mini D-Sub
15 P) shared with COMPUTER 1/2 input, 1 S-Video (Mini DIN 4P), 1
Video, 1 PC Card, 1 Stereo Mini Audio, 1 (L/R) RCA Audio, 1 PC Control
(Mini D-Sub 9P)
Outputs 1 RGB (Mini D-Sub 15P), 1 Stereo Mini Audio
USB Port 1 A Type
LAN Port RJ-45
Video Compatibility NTSC, NTSC4.43, PAL, PAL-60, PAL-N, PAL-M, SECAM, HDTV: 1080i,
1080i/50Hz, 720p, 576p, 576i, 480p, 480i/60Hz
Scan Rate Horizontal: 15 kHz to 100 kHz (RGB: 24 kHz or over)
Vertical: 48 Hz to 120 Hz
Video Bandwidth RGB: 100 MHz (-3dB)
Color Reproduction 16.7 million colors simultaneously, Full color
Horizontal Resolution NTSC / NTSC4.43 / PAL / PAL-M / PAL-N / PAL60: 540 TV lines
SECAM: 300 TV lines
RGB: 1024 dots (H) 
 768 dots (V)
External Control RS232, IR, LAN, USB
Sync Compatibility Separate Sync / Composite Sync / Sync on G
Built-in Speakers 1W 
 1 (monaural)
Power Requirement 100 - 240V AC, 50/60Hz
Input Current 3.3 - 1.4A
Power Consumption 292W in Lamp Normal mode
230W in Lamp Eco mode
16W in Standby Normal mode, 10W in Standby Power-saving mode
* Effective pixels are more than 99.99%.