NEC Lt157 Lcd Projector Users Manual

							E – 47
Terminology
PC card
ATA card
CompactFlash
TYPE (I, II and III)
BMP
JPEGThis is the name of a card currently being standardized by the Japan Electronic Industry Association (JEIDA) and PCMCIA
(Personal Computer Memory Card Interface Association) of the United States.
A type of PC card.  ATA was originally a type of interface between computers and fixed disk devices.  The ATA card is a standard
card-type recording medium.
CompactFlash card is a small removable card conforming to ATA specifications. It is one-fourth the volume of a PCMCIA card.
PCMCIA 2.1 PC cards are divided into three types according to their thickness:  Type I (3.3 mm), Type II (5.0 mm) and Type III
(10.5 mm).
A type of image format.  The standard Windows Bit Map format used for MS-DOS/Windows-compatible computers.
A type of image format.  "JPEG" is the abbreviation of Joint Photographic Experts Group.  JPEG compression offers efficient
data storage.  The data not required for displaying the image is identified and deleted.  Since the data is deleted, JPEG
algorithms are said to be irreversible.  This means that once the image is compressed, the decompressed image it is not the
same as the original image. 
						

							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 1500 hours (2500 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 1500 (2500 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 1600 (2600
hours : Eco mode) hours of service. If this happens, be sure to replace
the lamp. If you continue to use the lamp after 1500 hours (2500 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 .
CAUTION: Do not use a lamp other than the NEC replacement lamp(LT57LP). 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 1600 hours (2600 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 FiltersThe air-filter sponge keeps the inside of the LT158/LT157 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:When “Clean Filter” option is turned on, the “Please clean the filter”
message will be displayed each time the project or is turned on after it
has been used in excess of 100 hours. Should this message appear,
clean the filter.
• The message can be turned on or off using the “Menu” - “Filter Clean
Message” option on the Setup menu. See page E-36.
• After cleaning the filter and resetting the filter usage time to zero, the
message will not be displayed.
See page E-38 for resetting the filter usage time.
Vacuum the filter-through the filter cover.
MENU
ENTERCANCELS
E
L
E
C
TR
CE
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.
NOTE: When you replace the lamp, it is also wise to replace the filter. Thefilter comes in the same package with your replacement lamp.
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 vertically,
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 E-49.
• Check to see if the projector has overheated or the lamp usage exceeds 1600 hours (up to 2600 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 LT158) or PC Card
Viewer). See pages E-18 and 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-35.
• 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 E-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 Image Options Menu. See page E-35 or E-38.
Problem Check These  Items
Standby
Cooling down
Lamp in Normal mode
Lamp in Eco mode
Re-firing the lamp 
One minute after lamp is turned on
Lamp has reached its end of life
(Normal: 1500 hours or over)
(Eco: 2500 hours or over)
Lamp life has reached its end of life
(Normal: 1600 hours or over)
(Eco: 2600 hours or over)
Lamp or filter cover error (2 locations)
Temperature error
Fan error
Lamp error
Condition
Steady orange
Blinking green
Steady green
Steady green
Steady green
Blinking green
Steady green
Steady orange
Steady orange
Steady orange
Steady orange
Steady orange–
–
–
Steady green
Blinking orange
No light in Normal mode /Steady
green in Eco mode
Steady red
Steady red
Blinking red (1 sec interval)
Blinking red (4 sec interval)
Blinking red (8 sec interval)
Blinking red (12 sec interval) –
Blinks green for 60 seconds
–
–
The projector retries 3 times at an inter-
val of 15 sec for max. 45 sec)
–
Message appears on screen during 1500-1600
hours(2500-2600 hours: Eco mode) 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?
•Is 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 to 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 LT158/LT157 Projector ’s performance.
Model Number LT158/LT157
Optical
LCD Panel 0.9 ” p-Si TFT active-matrix, 1024 
768 dots
With Micro Lens Array
Lens Manual zoom, manual focus F1.7 – 2.1    f=36.5  – 43.7 mm
Lamp 130W NSH lamp (110W in Eco mode) The lamp, under normal operating conditions, is warranted for 1500 hours of operation time within 6 months.
Image Size 25  – 300 inches (0.64  – 7.62 m) diagonal
Projection Distance 3.9  – 40.35 ft (1.2 - 12.3 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, Y/Cb/Cr (550 TV lines : LT158 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: 41 ˚ –  95 ˚F (5 ˚ 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)
* LT158 only
For additional information visit:US:
http://www.necvisualsystems.com
Europe:http://www.nec-europe.com/
Global:http://www.nec-pj.com/
LCD panels are inherently susceptible to pixel defects.
For additional information regarding pixel data, please contact your local NEC sales office.
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")
19.7
(0.78") 40.3 (1.59")31.2 (1.23")
63 (2.5")
5 (0.2")
266 (10.47")
Cabinet Dimensions
Unit = mm (inch)
LT158/LT157
Lens center
Lens center 
						

							E – 54
D-Sub Pin Assignments
Mini D-Sub 15 Pin Connector
Pin No. RGB Signal (Analog) YCbCr Signal
1 Red Cr
2 Green or Sync on Green Y
3 Blue Cb
4 Ground
5 Ground
6 Red Ground Cr Ground
7 Green Ground Y Ground
8 Blue Ground Cb Ground
9 No 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
LT157 LT158
Pin No. Signal (Digital)1 T.M.D.S Data 2 -2 T.M.D.S Data 2 +3 T.M.D.S Data 2 Shield4 No connection5 No connection6 DDC Clock7 DDC Data8 Analog Vertical Sync9 T.M.D.S Data 1 -10 T.M.D.S Data 1 +11 T.M.D.S Data 1 Shield12 No connection13 No connection14 +5V Power15 Ground16 Hot Plug Detect17 T.M.D.S Data 0 -18 T.M.D.S Data 0 +19 T.M.D.S Data 0 Shield20 No connection21 No connection22 T.M.D.S Clock Shield23 T.M.D.S Clock +24 T.M.D.S Clock -25 Analog Red26 Analog Green27 Analog Blue28 Analog Horizontal Sync
29 Analog Ground
12
13
456
78
12
111314 1516
910
22
212324
1718
19 20
DVI Pin Assignments
DVI connector 
						

							E – 55
Compatible Input Signal List
Signal Resolution Frequency H. Refresh Rate Dot Clock
( Dots ) ( kHz ) ( Hz ) ( MHz )
NTSC–15.734 60–PA L–15.625 50–SECAM–15.625 50–VESA 640
480 31.47 59.94 25.175IBM 640
480 31.47 60 25.175MAC 640
480 31.47 60 25.175MAC 640
480 34.97 66.67 31.334MAC 640
480 35 66.67 30.24VESA 640
480 37.86 72.81 31.5VESA 640
480 37.5 75 31.5IBM 640
480 39.375 75 31.49VESA 640
480 43.269 85.01 36IBM 720
350 31.469 70.09 28.322VESA 720
400 37.927 85.04 35.5IBM 720
350 39.44 87.85 35.5IBM 720
400 39.44 87.85 35.5VESA 800
600 35.16 56.25 36VESA 800
600 37.879 60.32 40VESA 800
600 48.077 72.19 50VESA 800
600 46.88 75 49.5VESA 800
600 53.674 85.06 56.25MAC 832
624 49.725 74.55 57.283VESA 1024
768 35.5 43 Interlaced 44.9VESA 1024
768 48.363 60 65VESA 1024
768 56.476 70.07 75MAC 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# MAC 1152
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# MAC 1280
1024 69.89 65.2 118.5# HP 1280
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 74.25#SDTV (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–
#: Images in above flagged with # 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
LT157
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
LT158
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.