NEC Lt245 Portable Projector Users Manual

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8. Appendix
Common Problems & Solutions (See also Power/Status/Lamp Indicator on page 123.)
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
Capture function is not
possible.•Check that the power cable is plugged in and that the power button on the projector cabinet or the remote
control is on. See pages 26 and 28.
•Ensure that the lamp cover is installed correctly. See page 121.
•Check to see if the projector has overheated or the lamp usage exceeds 2100 hours (up to 4100 hours : Eco
mode). If there is insufficient ventilation around the projector or if the room where you’re presenting is par-
ticularly warm, move the projector to a cooler location.
•The lamp may fail to light. Wait a full minute and then turn on the power again.
•The lamp has reached the end of its usable life. Replace the lamp.
•Ensure that the Power Management is off. See page 107.
•Use the SOURCE button on the projector cabinet or the VIDEO, the S-VIDEO, the COMPUTER 1/2, the VIEWER
or the LAN button on the remote control to select your source. See page 30.
•Ensure your cables are connected properly.
•Use menus to adjust the brightness and contrast. See page 79.
•Remove the lens cap.
•Reset the settings or adjustments to factory preset levels using the Reset in the Menu. See page 116.
•Enter your registered keyword if the Security function is enabled. See page 48.
•When using with a notebook PC, be sure to connect between the projector and the notebook PC before turning
on the power to the notebook PC. In most cases signal cannot be output from RGB output unless the notebook
PC is turned on after connecting with the projector.
*If the screen goes blank while using your remote control, it may be the result of the computers screen-
saver or power management software.
*If you accidentally hit the POWER button on the remote control, wait 90 seconds and then press the POWER
button again to resume.
•See also the next page.
•Check if an appropriate color is selected in Wall Color. If so, select an appropriate option. See page 80.
•Adjust Hue in Adjust. See page 80.
•Reposition the projector to improve its angle to the screen. See page 31.
•Use the 3DReform function to correct the trapezoid distortion. See page 33.
•Adjust the focus. See page 32.
•Reposition the projector to improve its angle to the screen. See page 31.
•Ensure that the distance between the projector and screen is within the adjustment range of the lens. See page
15.
•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 1/2, the VIEWER
or the LAN button on the remote control to select your source (Video, S-Video, Computer, Viewer or LAN). See
page 30.
•Adjust the computer image manually with the “Clock”/“Phase” in “Adjust” → “Image Options”. See page 86.
•Install new batteries. See page 12.
•Make sure there are no obstacles between you and the projector.
•Stand within 22 feet (7 m) of the projector. See page 12.
•See the POWER/STATUS/LAMP Indicator on page 123.
•Press the AUTO ADJUST button on the projector cabinet or the AUTO ADJ. button on the remote control. See
page 35.
•Adjust the computer image manually with the “Clock”/“Phase” in “Adjust” → “Image Options”. See page 86.
•Make sure that your USB mouse is properly connected to the projector.
The projector may not support some brands of a USB mouse.
•The Capture function is not available on LAN. See  page 30.
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 RGB cable between the projector and the computer before turning on the computer.
There are some notebook PCs, which do not output signal unless there is a projector or monitor connected first.
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 113 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 projec-
tor.  When using a PC compatible laptop, a combination of function keys will enable/disable the external display.
Usually, 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 projec-
tor) 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 “mirror-
ing” 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 LT265/LT245 Projectors performance.
Model Number LT265/LT245
Optical
DMD™ Single Chip Digital Micromirror Device (DMD™)
Resolution 1024 
 768 pixels* up to UXGA with Advanced AccuBlend
Lens Manual zoom and focus:
LT265: F2.1 - 2.3    f=28.2mm - 33.6mm
LT245: F2.2 - 2.5    f=22.1mm - 26.5mm
Lamp 220 W DC standard
Image Size 30 inches - 500 inches (0.8 m - 12.7 m) diagonal
Projection Distance LT265: 3.8ft - 80.7ft / 1.20m - 24.5m
LT245: 2.95ft - 62.3ft / 0.90m - 19.1m
Projection Angle LT265: 14.8°-15.4°(wide) / 12.3°-12.7°(tele)
LT245: 18.5°-19.4°(wide) / 15.6°-16.2°(tele)
Electrical
Inputs 2 RGB (Mini D-Sub 15p), 1 S-Video (Mini DIN 4p), 1 Video, 1 PC Card,
1 Stereo Mini Audio, 1 (L/R) RCA Audio, 1 PC Control (Mini DIN 8p)
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, 1080i, 720p,
576p, 576i, 480p, 480i (w/optional cable)
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)
Pixel Clock Freq Less than 135 MHz
Color Reproduction 16.7 million colors simultaneously, Full color
Horizontal Resolution NTSC / NTSC4.43/PAL / YCbCr: 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 2W 
 1 (monaural)
Power Requirement 100 - 240V AC, 50/60Hz
Input Current 3.1 - 1.4A
Power Consumption 290W in Lamp Normal mode
240W in Lamp Eco mode
12W in Standby mode
* Effective pixels are more than 99.99%. 
						

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8. Appendix
Mechanical
Installation Orientation: Desktop/Front, Desktop/Rear, Ceiling/Front, Ceiling/Rear
Dimensions 10.2 (W) 
 3.6 (H) 
 10.8 (D)
260mm (W) 
 92mm (H) 
 275mm (D)
(not including protrusions)
Net Weight LT265: 6.5 lbs / 2.9 kg
LT245: 7.1 lbs / 3.2 kg
Environmental Considerations
Operational Temperatures  :
41° to 95°F (5° to 35°C), 20% to 80% humidity
(non-condensing)
Storage Temperatures  :
14° to 122°F (-10° to 50°C), 20% to 80% humidity
(non-condensing)
Regulations UL Approved (UL 60950, CSA 60950)
Meets DOC Canada Class B requirements
Meets FCC Class B requirements
Meets AS/NZS CISPR.22 Class B
Meets EMC Directive (EN55022, EN55024, EN61000-3-2, EN61000-3-
3)
Meets Low Voltage Directive (EN60950, TÜV GS Approved)
For additional information visit:
US : http://www.necvisualsystems.com
Europe : http://www.neceurope.com/
Global : http://www.nec-pj.com/
Digital Light Processing, DLP, Digital Micromirror Device and DMD are trademarks of Texas Instruments.
The specifications are subject to change without notice. 
						

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PC CARDSOURCE
AUTO ADJUST
3D REFORMLAMP
STATUS
POWER ON/STAND BYSELECT
260 (10.24) 
57 (2.24)
275 (10.83) 
LT265: 313 (12.32) / LT245: 315 (12.4)
123 (4.84)107 (4.2) 83 (3.27) 
92 (3.6)
PC CARDR  AUDIO IN  L VIDEO INCOMPUTER 1 IN  COMPUTER 2 IN MONITOR OUT AUDIO INAUDIO OUT
USB LAN
S-VIDEO INPC CONTROL
8. Appendix
 Cabinet Dimensions
Lens center
Lens center
Unit: mm (inch) 
						

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Mini D-Sub 15 Pin Connector
 Pin Assignments of D-Sub COMPUTER 1/2 Input Connector
Signal Level
Video signal : 0.7Vp-p (Analog)
Sync signal : TTL level
* COMPUTER 1 IN connector only51423
10
11 12 13 14 156 978
8. Appendix
Pin No. RGB Signal (Analog) YCbCr Signal
1Red Cr
2Green or Sync on Green Y
3Blue Cb
4Ground
5Ground
6Red Ground Cr Ground
7Green Ground Y Ground
8Blue Ground Cb Ground
9No Connection
10 Sync Signal Ground
11 Ground
12 Bi-directional DATA (SDA)*
13 Horizontal Sync or Composite Sync
14 Vertical Sync
15 Data Clock* 
						

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8. Appendix
 Compatible Input Signal List
Signal Resolution Frequency H. Refresh Rate Dot Clock
( Dots ) ( kHz ) ( Hz ) ( MHz )
#:Images in above flagged with # are compressed with Advanced AccuBlend on LT265 and LT245.
NOTE: Some composite sync signals may not be displayed correctly.
Signals other than those specified in the table above may not be displayed correctly. If this should happen, change the refresh
rate or resolution on your PC. Refer to Display Properties help section of your PC for procedures.
UXGA (1600 
 1200) is supported for separate sync signal only.
NTSC – 15.734 60 –
PAL–15.625 50 –SECAM – 15.625 50 –VESA 640
480 31.47 59.94 25.175
IBM 640
480 31.47 60 25.175MAC 640
480 31.47 60 25.175MAC 640
480 34.97 66.67 31.334
MAC 640
480 35 66.67 30.24VESA 640
480 37.86 72.81 31.5VESA 640
480 37.5 75 31.5
IBM 640
480 39.375 75 31.49VESA 640
480 43.269 85.01 36IBM 720
350 31.469 70.09 28.322
VESA 720
400 37.927 85.04 35.5IBM 720
350 39.44 87.85 35.5IBM 720
400 39.44 87.85 35.5
VESA 800
600 35.16 56.25 36VESA 800
600 37.879 60.32 40VESA 800
600 48.077 72.19 50
VESA 800
600 46.88 75 49.5VESA 800
600 53.674 85.06 56.25MAC 832
624 49.725 74.55 57.283
VESA 1024
768 35.5 43 Interlaced 44.9VESA 1024
768 48.363 60 65VESA 1024
768 56.476 70.07 75
MAC 1024
768 60.241 74.93 80VESA 1024
768 60.023 75.03 78.75VESA 1024
768 68.677 85 94.5
#VESA 1152
864 67.5 75 108#MAC1152
870 68.681 75.06 100#SUN 1152
900 61.796 65.95 92.94
#SGI 1152
900 71.736 76.05 105.6#VESA 1280
960 60 60 108#VESA 1280
1024 63.981 60.02 108
#MAC1280
1024 69.89 65.2 118.5#HP1280
1024 78.125 72.01 135#SUN 1280
1024 81.13 76.11 135
#VESA 1280
1024 79.976 75.03 135#VESA 1280
1024 91.146 85.02 157.5#HDTV (1080i)(1125i)1920
1080 33.75 60 Interlace 74.25
#HDTV (1080i)(1125i)1920
1080 28.13 50 Interlace 74.25#HDTV (720p)(750p)1280
720 45 60 Progressive 74.25SDTV (480p)(525p)–31.47 59.94 Progressive 27
#VESA 1600
1200 75.0 60 162#VESA 1600
1200 81.3 65 175.5#VESA 1600
1200 87.5 70 189
#VESA 1600
1200 93.75 75 202.5DVD YCbCr – 15.734 59.94  Interlaced –DVD YCbCr – 15.625 50  Interlaced – 
						

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8. Appendix
Cable Connection
Communication Protocol
Baud rate ........................................ 38400 bps
Data length ..................................... 8 bits
Parity .............................................. No parity
Stop bit .......................................... One bit
X on/off .......................................... None
Communications procedure ........... Full duplex
NOTE: Depending on the equipment, a lower baud rate may be recommended for long cable runs.
 PC Control Codes and Cable Connection
PC Control Codes
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT COMPUTER 1 02H 03H 00H 00H 02H 01H 01H 09H
INPUT SELECT COMPUTER 2 02H 03H 00H 00H 02H 01H 02H 0AH
INPUT SELECT VIDEO 02H 03H 00H 00H 02H 01H 06H 0EH
INPUT SELECT S-VIDEO 02H 03H 00H 00H 02H 01H 0BH 13H
INPUT SELECT VIEWER 02H 03H 00H 00H 02H 01H 1FH 27H
PICTURE MUTE ON 02H 10H 00H 00H 00H 12H
PICTURE MUTE OFF 02H 11H 00H 00H 00H 13H
SOUND MUTE ON 02H 12H 00H 00H 00H 14H
SOUND MUTE OFF 02H 13H 00H 00H 00H 15H
ON SCREEN MUTE ON 02H 14H 00H 00H 00H 16H
ON SCREEN MUTE OFF 02H 15H 00H 00H 00H 17H
ASPECT RATIO (4:3 Screen)
4:3 03H 10H 00H 00H 05H 18H 00H 00H 00H 00H 30H
Letterbox 03H 10H 00H 00H 05H 18H 00H 00H 01H 00H 31H
Widescreen 03H 10H 00H 00H 05H 18H 00H 00H 02H 00H 32H
Crop 03H 10H 00H 00H 05H 18H 00H 00H 03H 00H 33H
ASPECT RATIO (16:9 Screen)
4:3 Window 03H 10H 00H 00H 05H 18H 00H 00H 00H 00H 30H
Letterbox 03H 10H 00H 00H 05H 18H 00H 00H 01H 00H 31H
Widescreen 03H 10H 00H 00H 05H 18H 00H 00H 02H 00H 32H
4:3 Fill 03H 10H 00H 00H 05H 18H 00H 00H 04H 00H 34H
AUTO ADJUST 02H 0FH 00H 00H 02H 05H 00H 18H
NOTE: Contact your local dealer for a full list of PC Control Codes if needed. 
						

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8. Appendix
 Using Software Keyboard
1 to 0 and Characters
.............................. Use to type in password or keyword.
MODE .................... Selects one of three modes for alphabet and special characters.
SP ......................... Inserts a space
BS ......................... Deletes one character backward
.......................... Returns to the previous
.......................... Advances to the next
OK ......................... Executes the selection
Cancel ................... Cancels the selection
NOTE: You can drag the Software keyboard on the screen by clicking and holding any part on the keyboard except buttons.
NOTE1: Pins 2, 3, 5, 6 and 8 are used inside the projector.
NOTE 2: For long cable runs it is recommended to set communication speed within projector menus to 9600 bps.
PC Control Connector (DIN-8P)
1 2 54 36
7 8
To RxD of PC
To TxD of PC To GND of PC 
						

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No image is displayed from your PC or video equipment to the
projector.
Still no image even though you connect the projector to the PC
first, then start the PC.
Enabling your notebook PC’s signal output to the projector.
•A combination of function keys will enable/disable the ex-
ternal display. Usually, the combination of the “Fn” key along
with one of the 12 function keys turns the external display
on or off.
No image (blue background, logo, no display).
Still no image even though you press the AUTO ADJUST but-
ton.
Still no image even though you carry out “Reset” in the
projector’s menu.
Signal cables plug is fully inserted into the input connector
A message appears on the screen.
( _____________________________________________ )
The source connected to the projector is active and available.
Still no image even though you adjust the brightness and/or
the contrast.
Input sources resolution and frequency are supported by the
projector.
 Troubleshooting Check List
Before contacting your dealer or service personnel, check the following list to be sure repairs are needed also by
referring to the “Troubleshooting” section in your user’s manual. This checklist below will help us solve your problem
more efficiently.
* Print the following pages.
Frequency of occurrence   always    sometimes (How often?_____________________)     other (__________________)
Power
No power (POWER indicator does not light green)   See also “Sta-
tus Indicator (STATUS)”.
Power cables plug is fully inserted into the wall outlet.
Main power switch is pressed to the ON position.
Lamp cover is installed correctly .
Lamp Hour Meter (lamp operation hours) was cleared after
lamp replacement.
No power even though you press and hold the POWER button
for a minimum of 2 seconds.Shut down during operation.
Power cables plug is fully inserted into the wall outlet.
Lamp cover is installed correctly .
Power Management is turned off (only models with the Power
Management function).
Sleep Timer is turned off (only models with the Sleep Timer
function ).
Video and Audio
Image is too dark.
Remains unchanged even though you adjust the brightness
and/or the contrast.
Image is distorted.
Image appears to be trapezoidal (unchanged even though you
carry out the “Keystone or “3D Reform” adjustment).
Parts of the image are lost.
Still unchanged even though you press the AUTO ADJUST but-
ton.
Still unchanged even though you carry out “Reset” in the
projector’s menu.
Image is shifted in the vertical or horizontal direction.
Horizontal and vertical positions are correctly adjusted on a
computer signal.
Input sources resolution and frequency are supported by the
projector.
Some pixels are lost.
Image is flickering.
Still unchanged even though you press the AUTO ADJUST but-
ton.
Still unchanged even though you carry out “Reset” in the
projector’s menu.
Image shows flickering or color drift on a computer signal.
Image appears blurry or out of focus.
Still unchanged even though you checked the signal’s resolu-
tion on PC and changed it to projector’s native resolution.
Still unchanged even though you adjusted the focus.
No sound.
Audio cable is correctly connected to the audio input of the
projector.
Still unchanged even though you adjusted the volume level.
AUDIO OUT is connected to your audio equipment (only mod-
els with the AUDIO OUT connector).
Other
Remote control does not work.
No obstacles between the sensor of the projector and the re-
mote control.
Projector is placed near a fluorescent light that can disturb the
infrared remote controls.
One or more remote sensors are enabled (only models with
the Remote Sensor Selection function).
Batteries are new and are not reversed in installation.
If present on the remote control, projector selector switch is
not used.Buttons on the projector cabinet do not work ( only models with
the Key Lock function).
Cabinet Button Lock is not turned on or is disabled in the menu.
Still unchanged even though you press and hold the EXIT but-
ton for a minimum of 10 seconds.
8. Appendix