NEC Lt75z Micro-portable Projector Users Manual

							E-35
Setup
Page1 Page2 Page3 Page4
Default Source Select
Communication SpeedSelect
19200bps
Control Panel Key LockClear Lamp Hour Meter
Default Source RGB
Unlocked
To lock the cabinet buttons:
1) Use the Select 
 or  button to select “Control Panel Key
Lock”  and press the ENTER button. The submenu will be
displayed.
2) Use the Select 
 or  button to select “Lock” and press the
ENTER button. The following confirmation screen will be dis-
played.
3) Use the Select 
 or  button to select “Ye s” and press the
ENTER button.
The diplay will be changed to “Control Panel Key Lock - Lock”
and be returned to the previous menu screen.
NOTE: When “No” is selected and the ENTER button is pressed,
the displayed will not be changed and will be returned to the previ-
ous menu screen.
2) Use the Select 
 or  button on the remote control to se-
lect “Unlock” and press the ENTER button on the remote
control. This change will take effect immediately.
NOTE:
•The confirmation screen will not be displayed.
•When the cabinet buttons are locked, pressing and holding the
CANCEL button for about 10 seconds will change the setting
from Locked to Unlocked.
[Clear Lamp Hour Meter]
Resets the lamp clock back to zero. Selecting this option dis-
plays submenu for a confirmation. To reset the lamp usage
hour meter, use the 
 or  button to select “Ye s”.
NOTE: The projector will turn off and go into standby mode after 1100
hours (up to 1600 hours in Eco mode) of service. If this happens,
press the “Help” button on the remote control for ten seconds to reset
the lamp clock back to zero. Do this only after replacing the lamp.
Lock
Are you sure ?
Ye s
No
Setup
Page1 Page2 Page3 Page4
Default Source Select
Communication SpeedSelect
19200bps
Control Panel Key LockClear Lamp Hour Meter
Default Source RGB
Unlocked
Lock
Unlock
NOTE: The progress indicator shows the percentage of remaining bulb
life.The value informs you of the amount of lamp and projector usage
respectively.
Information
Displays the status of the current signal and lamp usage. This
dialog box has three pages. The information included are as
follows:
 [Page 1]
 Source Index
 Input Terminal
 Horizontal Frequency
 Vertical  Frequency
 Sync Polarity
 [Page 2]
 Signal Type
 Video Type
 Sync Type
 Interlace [Page 3]
 Remaining Lamp Time (%)*
 Lamp Hour Meter (H)
 Projector Usage (H)
* When the remaining lamp time
reaches 0, the Remaining Lamp
Time bar indicator changes from
0% to 100 Hours and starts
counting down.
If the remaining lamp time
reaches 0 hours, the projector will
not turn on regardless of whether
the lamp mode is set to Normal
or Eco.
This option turns on or off the Control Panel Key Lock func-
tion.
NOTE:
•When the cabinet buttons are not locked, “Control Panel Key
Lock - Unlock” will be displayed. When the cabinet buttons are
locked, “Control Panel Key Lock - Locked” will be displayed.
•This Control Panel Key Lock does not affect the remote control
and the PC Control functions.
[Conrol Panel Key Lock]To unlock the cabinet buttons:
1) Use the Select 
 or  button on the remote control to se-
lect “Control Panel Key Lock” and press the ENTER button
on the remote control. The submenu will be displayed. 
						

							E-36
This section describes the simple maintenance procedures you
should follow to replace the lamp.
Replacing the Lamp
After your lamp has been operating for 1000 hours (1500 hours:
Eco mode) or longer, the “Status” indicator in the cabinet will
go on and the message will appear. Even though the lamp
may still be working, replace it at 1000 hours (1500 hours: Eco
mode) 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 90 seconds, 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 three lamp case screws. You could
receive an electric shock.
•The projector will turn off and go into stand by mode
after 1100 hours (1600 hours: Eco mode) of service.
If this happens, be sure to replace the lamp. If you
continue to use the lamp after 1000 hours (1500
hours: 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:
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 three screws securing the lamp housing until
the screwdriver goes into a freewheeling condition. The three
screws are not removable.
3 Remove the lamp housing by pulling out the handle.
NOTE: There is an interlock on this case to prevent the risk ofelectrical shock. Do not attempt to circumvent this interlock.
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 re-
placement lamp (LT51LP). Order this from your NEC
dealer.
5 Secure it in place with the three screws.
Be sure to tighten the screws.
6 Reattach the lamp cover.
7 Tighten the lamp cover screw.
Be sure to tighten the screw.
8 After you install a new lamp, select the [Advanced Menu] →
[Projector Options] → [Setup] → [Page 4] → [Clear Lamp
Hour Meter] to reset the lamp usage hours.
If the projector will not be turned on after using 1100 hours
(1600 houres: Eco mode)of service, press and hold the [Help]
button on the remote control for ten seconds or longer to
reset the lamp time clock to zero. 
						

							E-37
Power/Status Light Messages
Standby
Cooling down
Lamp in Normal mode
Lamp in Eco mode
Retrying to turn on lamp
One minute after lamp is turned
on
Lamp has reached its end of life
(Normal: 1000 hours or over)
(Eco: 1500 hours or over)
Lamp life has reached its end of
life
(Normal: 1100 hours or over)
(Eco: 1600 hours or over)
Lamp cover error
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 90 seconds
–
–
The projector retries 3 times at an interval of 15
sec for max. 45 sec)
–
Message appears on screen during 1000-1100
hours (1500-1600 hours: Eco mode) of lamp us-
age. The projector reaches its end of life. Please
replace the lamp as soon as possible
The projector is in standby mode and cannot
be turned on.
The projector is in standby mode and cannot
be turned on.
The projector is in standby mode and cannot
be turned on.
The projector is in standby mode and cannot
be turned on.
The projector is in standby mode and cannot
be turned on.
Power IndicatorStatus Indicator
Note
5. TROUBLESHOOTING
This section helps you resolve problems you may encounter while setting up or using the projector.
Common Problems & Solutions
Does not turn on
No picture
Image isn’t square to the screen
Picture is blurred
Image is scrolling vertically, hori-
zontally or both
Remote control does not work
Status indicator is lit or blinking
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 is installed correctly. See page E-36.
•Check to see if the projector has overheated or the lamp usage exceeds 1100 hours. If there is insuffi-
cient ventilation around the projector or if the room where you’re presenting is particularly warm, move
the projector to a cooler location.
•Use the menu to select your source (Video, S-Video or RGB). See page E-29.
•Ensure your cables are connected properly.
•Use menus to adjust the brightness and contrast. See page E-29.
•Remove the lens cap.
•Reset the settings or adjustments to factory preset levels using the Factory Default in the Adjustment
Menu. See page E-31.
•Reposition the projector to improve its angle to the screen. See page E-24.
•Use the Keystone in the Adjustment Menu to correct the trapezoid distortion. See page E-29.
•Adjust the focus. See page E-24.
•Reposition the projector to improve its angle to the screen. See page E-24.
•Ensure that the distance between the projector and screen is within the adjustment range of the lens.
See page E-16.
•Use menus or 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 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/
Clock in the Image Options. See page E-31 or E-34.
ProblemCheck These  Items 
						

							E-38
6. SPECIFICATIONS
This section provides technical information about the LT75Z Projectors performance
Model Number LT75Z
Optical
DMD™Single Chip Digital Micromirror Device(DMD™), 800
600 dots
Lens Manual Zoom, Manual focus: F2.6 – 2.8  f = 28.3 – 34.0 mm
Lamp 135W NSH lamp
(The lamp is warranted for 1000 hours of operation time within 6 months.)
Image Size 30 - 200 inches (0.8 - 5.1 m) diagonal
Projection Distance 4.13 - 32.97ft (1.26 - 10.05m)
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 -120Hz
Video Bandwidth RGB: 80 MHz (-3dB)
Color Reproduction Full color, 16.7 million colors simultaneously.
Horizontal Resolution 550 TV lines: NTSC/PAL/YCbCr
300 TV lines: SECAM
RGB: 800 dots horizontal, 600 dots vertical
Power Requirement 100 - 120/200 - 240V AC, 50 / 60 Hz
Input Current 2.1A (100 - 120V AC) / 1.0A (200 - 240V AC)
Mechanical
Dimensions 9.6 (W) x 2.1 (H) x 7.7 (D) / 243mm (W) x 53mm (H) x 196mm (D) (not including protrusions)
Net Weight 3.3 lbs / 1.5 kg
Environmental
Considerations Operational Temperatures: 41˚ to 95˚F (5˚ to 35˚C), 20 to 80% humidity
Storage Temperatures: 14˚ to 122˚F (-10˚ to 50˚C), 20 to 80% humidity
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)
We provide information about our projectors through the World Wide Web at 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. 
						

							E-39
MENU
ENTERCANCEL
SELECTAUTO ADJUST
STATUSPOWER
ON /
STAND BYSOURCE
AC  IN ™
VIDEOS-VIDEO
RGB
AUDIO
PC CONTROL
Cabinet Dimensions
238 (9.4)
196 (7.7)
53 (2.1)
8 (0.31)Lens center
Lens center
Unit = mm (inch) 243 (9.6)
43.5 (1.7)
29.5
(1.16) 
						

							E-40
51423
10
11 12 13 14 156 978
D-Sub Pin Assignments
Mini D-Sub 15 Pin Connector
Pin No. RGB Signal (Analog) YCbCr Signal
1Red 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
12 Bi-directional DATA (SDA)
13 Horizontal Sync or Composite Sync
14 Vertical Sync
15 Data Clock
Signal Level
Video signal : 0.7Vp-p (Analog)
Sync signal : TTL level 
						

							E-41 #: 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 therefresh rate or resolution on your PC.  Refer to Display Properties help section of your PC for procedures.
NOTE3: UXGA (1600
1200) is supported for separate sync signal only.
Compatible Input Signal List
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 25.175
MAC 640
480 34.97 66.67 31.334MAC 640
480 35 66.67 30.24VESA 640
480 37.86 72.81 31.5
VESA 640
480 37.5 75 31.5IBM 640
480 39.375 75 31.49VESA 640
480 43.269 85.01 36
IBM 720
350 31.469 70.09 28.322VESA 720
400 37.927 85.04 40IBM 720
350 39.44 87.85 35.5
IBM 720
400 39.44 87.85 35.5VESA 800
600 35.16 56.25 36VESA 800
600 37.879 60.32 40
VESA 800
600 48.077 72.19 50VESA 800
600 46.88 75 49.5VESA 800
600 53.674 85.06 56.25
# MAC 832
624 49.725 74.55 57.283# VESA 1024
768 35.5 43 Interlaced 44.9# VESA 1024
768 48.363 60 65
# VESA 1024
768 57.476 70.07 75# MAC 1024
768 60.241 74.93 80# VESA 1024
768 60.023 75.03 78.75# VESA 1024
768 68.677 85 94.5
# VESA 1152
864 67.5 75 108# MAC 1152
870 68.681 75.6 100# 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 64.286 60.02 108
# MAC 1280
1024 65.2 69.89 118.5# 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
# SDTV (480i)(525i)–15.73 59.9 Interlace–# 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 75 202.5 Signal Resolution Frequency H. Refresh Rate Dot Clock
( Dots ) ( kHz ) ( Hz ) ( MHz ) 
						

							E-42
1 2 54 36
7 8
PC Control Codes
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
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
NOTE: Contact your local dealer for a full list of PC Control Codes ifneeded.
Cable Connection
Communication Protocol
Baud rate: 19200 bps
Data length: 8 bits
Parity: No parity
Stop bit: One  bit
X on/off: None
Communications Full duplex
procedure:
To TxD of PC
NOTE:  Pins 2, 3, 5, 6 and 8 are used inside the projector.
PC Control Connector (DIN-8P)
To RxD of PC
To GND of PC 
						

							Printed in Japan
7N8P0691