NEC Vt670 Projector User Manual

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7. Appendix
Common Problems & Solutions (See also Power/Status/Lamp Indicator on page 53.)
Does not turn on
Will turn off
No picture
Picture suddenly
becomes dark
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
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. See pages 20 and 21.
•Ensure that the lamp cover is installed correctly. See page 51.
•Check to see if the projector has overheated or the lamp usage exceeds 2100* hours (up to 3100* 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.
*VT575 and VT47: 3100 hours (up to 4100 hours in Eco mode).
•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 45.
•Use the VIDEO, the S-VIDEO or the COMPUTER button on the remote control to select your source (Computer,
Video or S-Video). See page 23. If there is still no picture, press the button again.
•Ensure your cables are connected properly.
•Use menus to adjust the brightness and contrast. See page 38.
•Remove the lens cap.
•Reset the settings or adjustments to factory preset levels using the “Default” in the Menu. See page 47.
•Enter your registered keyword if the Security function is enabled. See page 42.
•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.
•See also the next page.
•When one of the following happens, the Lamp mode automatically changes from Normal to Eco.
*When there are no signals (blue or black screen) → To return to the Normal mode, select another available
source.
*When the image is muted using the PIC-MUTE button on the remote control → Press the PIC-MUTE button
again to return to the Normal mode.
*When the room where you re presenting is particularly warm → Move the projector to a cooler location.
•Check if an appropriate color is selected in Wall Color. If so, select an appropriate option. See page 37.
•Adjust Hue in Picture. See page 38.
•Reposition the projector to improve its angle to the screen. See page 24.
•Use the Keystone correction function to correct the trapezoid distortion. See page 26.
•Adjust the focus. See page 25.
•Reposition the projector to improve its angle to the screen. See page 24.
•Ensure that the distance between the projector and screen is within the adjustment range of the lens. See
pages 11 for VT676/VT670/VT575/VT470 and 12 for VT47.
•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 VIDEO, the S-VIDEO or the COMPUTER button on the remote control to select your source (Video, S-
Video or Computer). See page 23.
•Adjust the computer image manually with the Horizontal/Vertical in the “Advanced → Page 2”. See page 45.
•Install new batteries.See page 10.
•Make sure there are no obstacles between you and the projector.
•Stand within 22 feet (7 m) of the projector. See page 10.
•See the POWER/STATUS/LAMP Indicator on page 53.
•Press the AUTO ADJ. button on the projector cabinet or the remote control. See page 28.
•When “Off” is selected in Auto Adjust, adjust the computer image manually with Clock/Phase in “Advanced →
Page 2” in the menu. See pages 45 and 46.
Problem Check These  Items
For more information contact your dealer. 
						

							55
7. 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 46 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. 
						

							56
7. Appendix
 Specifications
This section provides technical information about the VT676/VT670/VT575/VT470/VT47 Projectors performance.
Model Number VT676/VT670/VT575/VT470/VT47
Optical
LCD Panel 0.7 p-Si TFT active-matrix (with Micro Lens Array on VT676, VT670 and
VT575 only)
ResolutionVT676/VT670/VT575: 1024 
 768 pixels* native, up to UXGA with Ad-
vanced AccuBlend
VT470: 800 
 600 pixels* native, up to UXGA with Advanced AccuBlend
VT47: 800 
 600 pixels* native, up to SXGA with Advanced AccuBlend
LensVT676/VT670/VT575/VT470: Manual zoom and manual focus
F1.7 - 2.0   f=21.6 - 25.9 mm
VT47: Digital zoom and manual focus
F2.0     f=17.5 mm
LampVT676 : 190W DC lamp (150W Eco mode)
VT670/VT470: 180W DC lamp (150W  Eco mode)
VT575/VT47: 130W DC lamp (110W  Eco mode)
Image Size (Diagonal)VT676/VT670/VT575/VT470: 21 - 300 inches / 0.5 - 7.6 m
VT47: 25 - 300 inches / 0.6 - 7.6 m
Projection DistanceVT676/VT670/VT575/VT470: 2.4 - 35.89 ft / 0.73 - 10.9 m
VT47: 1.9 - 23.92 ft / 0.58 - 7.3 m
Projection AngleVT676/VT670/VT575/VT470: Tele: 9.5° - 9.9°/ Wide: 11.5° - 12.0°
VT47: 14.0° - 14.6°
Keystone Correction +/- 30° Vertical (auto)
Electrical
InputsVT676/VT670/VT575/VT470: 2 RGB/Component (D-Sub 15 Pin),
1 S-Video (DIN 4 Pin), 1 Video (RCA), 2 (L/R) RCA Audio,
1 Stereo Mini Audio, 1 PC Control (DIN 8 Pin)
VT47: 1 RGB/Component (D-Sub 15 Pin), 1 S-Video (DIN 4 Pin),
1 Video (RCA), 1 (L/R) RCA Audio, 1 Stereo Mini Audio,
1 PC Control (DIN 8 Pin)
Outputs 1 RGB (D-Sub 15 Pin), 1 Stereo Mini Audio (not available on VT47)
Video Compatibility NTSC, NTSC4.43, PAL, PAL-60, PAL-N, PAL-M, SECAM,
HDTV: 1080i, 1080i/50Hz, 720p, 576p, 480p, 480i/60Hz
Scan Rate Horizontal: 15 kHz to 100 kHz (RGB: 24 kHz or over)
Vertical: 50 Hz to 120 Hz
Video Bandwidth RGB: 80 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
YCbCr: 800 TV lines
RGB: VT676/VT670/VT575: 1024 dots (H)
768 dots (V),
VT470/VT47: 800 dots (H)
600 dots (V)
External Control RS232, IR
* Effective pixels are more than 99.99%. 
						

							57
7. Appendix
Sync Compatibility Separate Sync / Composite Sync / Sync on G
Built-in Speaker 1W (monaural)
Power Requirement 100 - 240V AC, 50 / 60 Hz
Input CurrentVT676/VT670/VT470: 2.7 - 1.4A
VT575/VT47: 2.1 - 1.2A
Power ConsumptionVT676/VT670/VT470: 8W in Standby mode /
250W in Lamp Normal mode / 200W in Lamp Eco mode
VT575/VT47: 8W in Standby mode /
190W in Lamp Normal mode / 155W in Lamp Eco mode
Mechanical
Installation Orientation Desktop/Front, Desktop/Rear, Ceiling/Front, Ceiling/Rear
Dimensions 11.6 (W)
3.7 (H)
10.2 (D)
294mm (W)
93mm (H)
260mm (D)
(not including protrusions)
Net Weight 6.5 lbs / 2.9 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
For United States:
UL Approved (UL 60950)
Meets FCC Class B requirements
For Canada:
UL Approved (CSA 60950)
Meets DOC Canada Class B requirements
For Australia/New Zealand:
Meets AS/NZS CISPR.22 Class B
For Europe:
Meets EMC Directive (EN55022, EN55024, EN61000-3-2, EN61000-3-3)
Meets Low Voltage Directive (EN60950, TUV GS Approved)
For additional information visit:
US : http://www.necvisualsystems.com
Europe : http://www.neceurope.com/
Global : http://www.nec-pj.com/
The specifications are subject to change without notice. 
						

							58
7. Appendix
 Cabinet Dimensions
LAMP
STATUS
POWER VIDEO
AUTO
ADJ.
S-VIDEO COMPUTER-1 COMPUTER-2
ON/STAND BY
ZOOMFOCUS
SELECT
AC IN
AUDIO OUT AUDIO
S-VIDEO INCOMPUTER 2 IN
VIDEO INCOMPUTER 1 IN
MONITOR  OUTPC CONTROLL/MONOR
AUDIOL/MONOR
AUDIO
112.5 (4.4)
260 (10.2)
20.3 (0.8)
64.6 (2.5)
294 (11.6)
71.5 (2.8)
Lens center
Lens center
Unit: mm (inch)
VT676/VT670/VT575/VT470 
						

							59
LAMP
STATUS
POWER VIDEO S-VIDEO COMPUTER
ON/STAND BY
ZOOMFOCUS
SELECT
AC IN
112.5 (4.4)
260 (10.2)
20.3 (0.8)
64.6 (2.5)
294 (11.6)
71.5 (2.8)
ZOOM
AUDIO
S-VIDEO INVIDEO INCOMPUTER IN
MONITOR  OUTPC CONTROLL/MONOR
AUTO
ADJ.
AUDIO
Lens center
Lens center
Unit: mm (inch)
VT47
7. Appendix 
						

							60
Mini D-Sub 15 Pin Connector
 Pin Assignments of D-Sub COMPUTER Input Connector
Signal Level
Video signal : 0.7Vp-p (Analog)
Sync signal : TTL level
51423
10
11 12 13 14 156 978
7. Appendix
* Only COMPUTER 1 input connector supported on VT676/VT670/VT575/VT470.
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 SCART Sync
12 Bi-directional DATA (SDA)*
13Horizontal Sync or Composite Sync
14 Vertical Sync
15 Data Clock* 
						

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7. Appendix
 Compatible Input Signal List
Signal Resolution Frequency H. Refresh Rate
( Dots ) ( kHz ) ( Hz )
NTSC – 15.734 60PAL–15.625 50PAL60 – 15.734 60SECAM – 15.625 50VESA 640
480 31.47 59.94IBM 640
480 31.47 60MAC 640
480 31.47 60MAC 640
480 34.97 66.67MAC 640
480 35 66.67VESA 640
480 37.86 72.81VESA 640
480 37.5 75IBM 640
480 39.375 75VESA 640
480 43.269 85.01IBM 720
350 31.469 70.09VESA 720
400 37.927 85.04IBM 720
350 39.44 87.85IBM 720
400 39.44 87.85VESA 800
600 35.16 56.25VESA 800
600 37.879 60.32VESA 800
600 48.077 72.19VESA 800
600 46.88 75VESA 800
600 53.674 85.06MAC 832
624 49.725 74.55@VESA 1024
768 35.5 43 Interlaced@VESA 1024
768 48.363 60@VESA 1024
768 56.476 70.07@MAC1024
768 60.241 74.93@VESA 1024
768 60.023 75.03@VESA 1024
768 68.677 85@#VESA 1152
864 67.5 75@#MAC1152
870 68.681 75.06@#SUN 1152
900 61.796 65.95@#SGI 1152
900 71.736 76.05@#VESA 1280
960 60 60@#VESA 1280
1024 63.981 60.02@#MAC1280
1024 69.89 65.18@#HP1280
1024 78.125 72.01@#SUN 1280
1024 81.13 76.11@#VESA 1280
1024 79.976 75.03@#VESA 1280
1024 91.146 85.02@#SXGA+ 1400
1050 – –@#HDTV (1080p)1920
1080 67.5 60 Progressive@#SDTV(576i)(625i)–15.6 50@#SDTV(576p)(625p)–31.5 50@#HDTV (1080i)(1125i)1920
1080 33.75 60 Interlace@#HDTV (1080i)(1125i)1920
1080 28.125 50 Interlace@#HDTV (720p)(750p)1280
720 45 60 Progressive@#SDTV (480p)(525p)–31.47 59.94 Progressive@# * VESA 1600
1200 75.0 60@# * VESA 1600
1200 81.25 65@# * VESA 1600
1200 87.5 70@# * VESA 1600
1200 93.75 75DVD YCbCr – 15.734 59.94  InterlacedDVD YCbCr – 15.625 50  Interlaced
#:Images in above flagged with # are compressed with Advanced AccuBlend on VT676/VT670/
VT575.
@:Images in above flagged with @ are compressed with Advanced AccuBlend on VT470/VT47.
*:Images in above flagged with * are not supported on VT47.
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. 
						

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7. Appendix
 PC Control Codes and Cable Connection
PC Control Codes (VT676/VT670/VT575/VT470)
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
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
PC Control Codes (VT47)
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT COMPUTER 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
Cable Connection
Communication Protocol
Baud rate ........................................ 19200 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.
NOTE: Contact your local dealer for a full list of the PC Contorol Codes if needed. 
						

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7. Appendix
1 2 54 36
7 8
To RxD of PC
PC Control Connector (DIN-8P)
To TxD of PC To GND of PC
NOTE: Pins 2, 3, 5, 6 and 8 are used inside the projector.