NEC Lt155 Lcd Projector Users Manual

							E – 48
This section describes the simple maintenance procedures you should
follow to replace the lamp and clean the filter.
Replacing the Lamp
After your lamp has been operating for 1000 hours (2000 hours : Eco
mode) or longer, the “Status” light in the cabinet will go on and the
message will appear. Even though the lamp may still be working, re-
place it at 1000 (2000 hours : Eco mode) hours to maintain optimal
projector performance.
CAUTION
•DO NOT TOUCH THE LAMP immediately after it has been used. It will
be extremely hot. Turn the projector off, wait a full minute, and then
disconnect the power cable. Allow at least one hour for the lamp to
cool before handling.
•DO NOT REMOVE ANY SCREWS except the lamp cover screw and two
lamp housing screws. You could receive an electric shock.
•The projector will turn off and go into stand by mode after 1100 (2200
hours : Eco mode) hours of service. If this happens, be sure to replace
the lamp. If you continue to use the lamp after 1000 hours (2000 hours
: Eco mode) of use, the lamp bulb may shatter, and pieces of glass may
be scattered in the lamp housing. 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:
1. Loosen the lamp cover screw until the screwdriver goes into a
freewheeling condition and remove the lamp cover. The lamp cover
screw is not removable.
4. MAINTENANCE
2. Loosen the two screws securing the lamp housing until the screw-
driver goes into a freewheeling condition. The two screws are not
removable.
Remove the lamp housing by pulling out the handle.
NOTE: There is an interlock on this case to prevent the risk of electricalshock. Do not attempt to circumvent this interlock.
3. 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(LT55LP). Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
4. Reattach the lamp cover.
Tighten the lamp cover screw.
Be sure to tighten the screw.
5. After you install a new lamp, select [Menu] → [Projector Op-
tions] → [Setup]→[Page 4]→[Clear Lamp Hour Meter] to reset
the lamp usage hours.
NOTE: When the lamp exceeds 1100 hours (2200 hours : Eco mode) of ser-
vice, the projector cannot turn on and the message is not displayed. If this
happens, press the Help button on the remote control for a minimum of 10
seconds while in standby mode. When the lamp time clock is reset to zero, the
STATUS indicator goes out.
Interlock 
						

							E – 49
Cleaning or Replacing the Filters
The air-filter sponge keeps the inside of the MultiSync LT156/LT155/
LT154 Projector free from dust or dirt 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 power 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 a filter cover.
•Your projector will not operate unless the filter cover is installed cor-
rectly.
To clean the air-filter:
Vacuum the filter-through the filter cover.
MENU
ENTERCANCELSELECTRCE
To replace the air-filter:
1. Remove the filter cover by pushing down on the catch of the cover
until you feel it detach.
2. Reinstall the new filter cover.
NOTE: Do not detach the sponge from the filter cover. Do not wash the filter
cover with soap and water. Soap and water will damage the the filter mem-
brane. Before replacing the filter cover, remove dust and dirt from the pro-
jector cabinet. Keep out dust and during filter replacement.
21 
						

							E – 50
5. TROUBLESHOOTING
This section helps you resolve problems you may encounter while setting up or using the projector.
Power/ Status Light Messages
Common Problems & Solutions
Does not turn on
No picture
Image isn’t square to the
screen
Picture is blurred
Image is scrolling ver tically,
horizontally or both
Remote control does not
work
Status indicator is lit or blink-
ing
Cross color in RGB mode•Check that the power cable is plugged in and that the power button on the projector cabinet or the remote
control is on.
•Ensure that the lamp cover or filter cover is installed correctly. See page E-48 and 49.
•Check to see if the projector has overheated or the lamp usage exceeds 1100 hours (2200 hours in Eco
mode). If there is insufficient ventilation around the projector or if the room where you’re presenting is particu-
larly warm, move the projector to a cooler location.
•Use the menu to select your source (Video, S-Video, RGB (DVI digital or DVI analog on LT156) or PC Card
Viewer). See page E-33.
•Ensure your cables are connected properly.
•Use menus to adjust the brightness and contrast. See page E-33.
•Remove the lens cap.
•Reset the settings or adjustments to factory preset levels using the Factory Default on the Image Options
Menu in Advanced menu. See page E-36.
•Reposition the projector to improve its angle to the screen. See page E-25.
•Use the Keystone to correct the trapezoid distortion. See page E-29 or 34.
•Adjust the focus. See page E-25.
•Reposition the projector to improve its angle to the screen. See page E-25.
•Ensure that the distance between the projector and screen is within the adjustment range of the lens. See
page E-16.
•Use menus or a source button on the remote control or the cabinet to select the source you want to input.
•Install new batteries. See page E-13.
•Make sure there are no obstacles between you and the projector.
•Stand within 22 feet (7 m) of the projector. See page E-13.
•Make sure that you are in the Projector mode or the PJ button lights in red. If not, press the PJ button.
•See the Power/ Status Light messages above.
•If Auto Adjust is off, turn it on. If Auto Adjust is on, turn it off and balance the image with the Position and Clock
Adjust on the Advanced Options Menu. See page E-35.
Problem Check These  Items
Standby
Cooling down
Lamp in High-Bright mode
Lamp in Eco mode
Retrying to turn on lamp
One minute after lamp is turned on
3 minutes after lamp is turned on in
Eco mode
Lamp has reached its end of life
(1000 hours or over)
Lamp life has reached its end of life
(1100 hours or over)
Lamp or filter cover error (2 locations)
Fan error
Lamp error
Temperature error
Condition
Steady orange
Blinking green
Steady green
Steady green
Steady green
Blinking green
Steady green
Steady green
Steady orange
Steady orange
Steady orange
Steady orange
Steady orange–
–
–
Steady green
Blinking orange
No light in High-Bright mode
Blinking green in Eco mode
Blinking green
Steady red (High-Bright mode)/
Steady orange (Eco mode)
Steady red
Blinking red (1 sec interval)
Blinking red (8 sec interval)
Blinking red (12 sec interval)
Blinking red (4 sec interval)–
Blinks green for 60 seconds
–
–
The projector retries 3 times at an inter-
val of 15 sec for max. 45 sec)
–
Fixed at High-Bright mode. Lamp mode
can be changed on the menu
Message appears on screen during 1000-
1100 hours of lamp usage. The projector
reaches its end of life. Please replace the
lamp as soon as possible
The projector is in standby mode and can-
not be turned on.
The projector is in standby mode and can-
not be turned on.
The projector is in standby mode and can-
not be turned on.
The projector is in standby mode and can-
not be turned on.
The projector is in standby mode and can-
not be turned on.
Power IndicatorStatus Indicator
Note 
						

							E – 51
•Is “PC Card Viewer” selected from the Source menu?
•Is the CompactFlash card seated in the PC CARD slot completely?
•Are slide data stored in the CompactFlash card?
•Have the contents of the CompactFlash card been destroyed?
•While an image with over 1024
768 dots is projected, several lines of information will be lost. Use the
supplied software change the image to 1024
768 dots in size.
•Use a computer, etc., to repair the data.
Condition Status
When using the PC Card Viewer function
For more information contact your dealer.No picture
Part of a slide is not displayed
Contents of CompactFlash
Card are damaged 
						

							E – 52
6. SPECIFICATIONS
This section provides technical information about the MultiSync LT156/LT155/LT154 Projector’s performance.
Model Number LT156/LT155/LT154
Optical
LCD Panel 0.9” p-Si TFT active-matrix, 1024
768 dots
With Micro Lens Array (LT156 / LT155)
Lens Manual zoom, manual focus
F2.0 – 2.3    f=36.5 – 42 mm
Lamp 130W NSH lamp (110W in Eco mode)
The lamp, under normal operating conditions, is warranted for 1000 hours of operation time within 6 months.
Image Size 25 – 300 inches (0.64 – 7.62 m) diagonal
Projection Distance 3.7 – 40.1 ft (1.1 - 12.2 m)
Electrical
Inputs Video (NTSC / PAL / PAL-N* / PAL-M* / PAL60 / SECAM / NTSC4.43)
Horizontal Frequency : 15 – 100 kHz (RGB : 24 kHz or over)
Vertical Frequency : 50 – 120 Hz
DVI 29 pin* : RGB digital (Max resolution: XGA), TMDS specification
(functions as DVI analog input)
Video Bandwidth RGB: 80 MHz
Color Reproduction Full color, 16.7 million colors simultaneously.
Horizontal Resolution 500 TV lines : NTSC / PAL / NTSC4.43 / YCbCr (550 TV lines : LT156 only)
350 TV lines : SECAM
RGB 1024 dots horizontal, 768 dots vertical
Power Requirement 100 – 120 / 200 – 240 VAC, 50 / 60 Hz
Input Current 2.2 A (100 – 120 VAC) / 1.0A (200 – 240 VAC)
Mechanical
Dimensions8.1 (W)
2.5 (H)
10.5 (D) / 207mm (W)
63mm (H)
266mm (D) (not including lens and feet)
Net Weight 4.9 lbs / 2.2 kg
Environmental ConsiderationsOperational Temperatures:32˚ – 95˚F (0˚ to 35˚C), 20 – 80% humidity (non-condensing)
Storage Temperatures:14˚ – 122˚F (-10˚ to 50˚C), 20 – 80% humidity (non-condensing)
Regulations UL Approved (UL 1950, CSA 950)
Meets DOC Canada Class B requirements
Meets FCC Class B requirements
Meets AS/NZS3548 Class B
Meets EMC Directive (EN55022, EN55024, EN61000-3-2, EN61000-3-3)
Meets Low Voltage Directive (EN60950, TUV GS Approved)
* LT156 only
LCD panels are inherently susceptible to bad pixels.
The LCD panel may have pixel failures at the rate of 0.01% or less.
We provide information about our projectors through the World Wide Web at 
http://www.nec-pj.com/
The specifications are subject to change without notice. 
						

							E – 53
MENU
ENTERCANCEL
SELECT
POWERSTATUS ON
/STAND BY
SOURCE
AUTO  
ADJUST
PC  CARD 
ACCESS
207 (8.15)
40.35 (1.59)
17
(0.67) 40.3 (1.59)31.2 (1.23)
63 (2.5)
5 (0.2)
266 (10.47)
Cabinet Dimensions
Unit = mm (inch)
LT156/LT155/LT154
Lens center
Lens center 
						

							E – 54
D-Sub Pin Assignments
Mini D-Sub 15 Pin Connector
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 ClockSignal Level
Video signal : 0.7Vp-p (Analog)
Sync signal : TTL level
51423
10
11 12 13 14 156 978 
						

							E – 55
Timing Chart
Y / N Signal Resolution Frequency H. Refresh Rate Dot Clock
( Dots ) ( kHz ) ( Hz ) ( MHz )
YNTSC 640
480 15.734 60 -
YPAL768
576 15.625 50 -
YSECAM 768
576 15.625 50 -
YVESA 640
480 31.47 59.94 25.175
YIBM 640
480 31.47 60 25.175
YMAC640
480 31.47 60 25.175
YMAC640
480 34.97 66.67 31.334
YMAC640
480 35 66.67 30.24
YVESA 640
480 37.86 72.81 31.5
YVESA 640
480 37.5 75 31.5
YIBM 640
480 39.375 75 31.49
YVESA 640
480 43.269 85.01 36
YIBM 720
350 31.469 70.09 28.322
YVESA 720
400 37.927 85.04 40
YIBM 720
350 39.44 87.85 35.5
YIBM 720
400 39.44 87.85 35.5
YVESA 800
600 35.16 56.25 36
YVESA 800
600 37.879 60.32 40
YVESA 800
600 48.077 72.19 50
YVESA 800
600 46.88 75 49.5
YVESA 800
600 53.674 85.06 56.25
YMAC832
624 49.725 74.55 57.283
YVESA 1024
768 35.5 43 Interlaced 44.9
YVESA 1024
768 48.363 60 65
YVESA 1024
768 57.476 70.07 75
YMAC1024
768 60.241 74.93 80
YVESA 1024
768 60.023 75.03 78.75
YVESA 1024
768 68.677 85 94.5
#Y VESA 1152
864 67.5 75 108
#Y MAC 1152
870 68.681 75.6 100
#Y SUN 1152
900 61.796 65.95 92.94
#Y SGI 1152
900 71.736 76.05 105.6
#Y VESA 1280
960 60 60 108
#Y SGI 1280
1024 63.9 60 107.35
#Y VESA 1280
1024 64.286 60.02 108
#Y MAC 1280
1024 64.31 60.38 107
#Y MAC 1280
1024 69.89 65.2 118.5
#Y HP 1280
1024 78.125 72.01 135
#Y SUN 1280
1024 81.13 76.11 135
#Y VESA 1280
1024 79.976 75.03 135
#Y VESA 1280
1024 91.146 85.02 157.5
#YHDTV (1080i)(1125i)1920
1080 33.75 60 Interlace 74.25
#YHDTV (720p)(750p)1280
720 45 60 Progressive 74.25
#YSDTV (480p)(525p)–31.47 59.94 Progressive 27
#YSDTV (480i)(525i)–15.73 59.9 Interlace –
#Y VESA 1600
1200 75.0 60 162
#Y VESA 1600
1200 81.3 65 175.5
#Y VESA 1600
1200 87.5 70 189
#Y VESA 1600
1200 93.75 75 202.5
YDVD YCbCr – 15.734 59.94  Interlaced –
YDVD YCbCr – 15.625 50  Interlaced –
#Y: Images in above flagged with # and Y are compressed with Advanced AccuBlend.
NOTE1: Some composite sync signals may not be displayed correctly.
NOTE2: 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.
NOTE3: UXGA can be supported for separate sync signal only.
NOTE4: DVI digital signal can support a maximum resolution of XGA@85Hz. 
						

							E – 56
1 2 54 36
7 8
Cable Connection
Communication Protocol
Baud rate: 38400 bps
Data length: 8 bits
Parity: No parity
Stop bit: One  bit
X on/off: None
Communications Full duplex
procedure:
PC Control Connector (DIN-8P)
To RxD of PC
To TxD of PC To GND of PC
NOTE:  Pins 2, 3, 5, 6 and 8 are used inside the projector.
PC Control Codes
LT155/LT154
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT RGB 02H 03H 00H 00H 02H 01H 01H 09H
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 PC CARD VIEWER02H 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
LT156
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT DVI (DIGITAL)02H 03H 00H 00H 02H 01H 1AH 22H
INPUT SELECT DVI (ANALOG)02H 03H 00H 00H 02H 01H 01H 09H
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 PC CARD VIEWER02H 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
NOTE: Contact your local dealer for a full list of the PC Control Codes if needed. 
						

							Printed in Japan
7N8P0203