NEC Vt676 Projector User Manual

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5. Using On-Screen Menu
Disabling the Cabinet Buttons [Cabinet Button Lock]
This option turns on or off the Cabinet Button Lock function.
NOTE:
•This Cabinet Button Lock does not affect the remote control and the PC Control functions.
•When the cabinet buttons are unlocked, pressing and holding the EXIT button for about 10 seconds will change the setting to
enable.
•Key symbol  indicates the Cabinet Button Lock is enabled.
Enabling High Speed Fan Mode [Fan Mode]
This option allows you to select two modes for fan speed: High speed mode and Auto mode.
High ...................... The built-in fans run at a fixed high speed.
Auto ...................... The built-in fans automatically run at a variable speed according to the internal temperature.
When you wish to cool down the temperature inside the projector quickly, select “High”.
NOTE: Select “High” if you continue to use the projector for consecutive days.
Selecting Signal Format [Signal Select]
[Computer]
Allows you to choose “Computer” for an RGB source such as a computer, or “Component” for a component video
source such as a DVD player. Normally select “RGB/Component” and the projector automatically detects a compo-
nent signal. However there may be some component signals that the projector is unable to detect. If this is the
case, select “Component”. Select “Scart” in Computer 1 (Computer on VT47) for the European Scart signal.
[Video & S-Video System Select]
This feature enables you to select composite video standards manually. Normally select “Auto”.
When you select the video standard for Video and S-Video, select the video standard from the pull-down menu.
This must be done for Video and S-Video respectively. 
						

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5. Using On-Screen Menu
(Advanced Page 2)
Enabling Power Management [Power Management]
When this option is on and there is no input for five minutes or more, the projector will automatically turn itself off.
Turning On Noise Reduction [Noise Reduction] (not available for Video and S-Video signals)
Reduces video noise. Select “On” to enable the Noise Reduction feature.
Turning On Flicker Reduction [Flicker Reduction]
Reduces flicker which can occur in an interlaced signal. This feature is not available for RGB and HDTV signals.
NOTE: When the Flicker Reduction is ON, jagged lines can be visible depending on the signal. In that case, select OFF.
NOTE: This feature may not be available depending on your video equipment connected to the projector.
Setting Auto Adjust [Auto Adjust]
This feature sets the Auto Adjust mode so that the RGB image can be automatically or manually adjusted for noise
and stability. You can automatically make adjustment in two ways: Normal and Fine
Off ......................... The RGB image will not be automatically adjusted.
You can manually optimize the RGB image.
Normal .................. Default setting. The RGB image will be automatically adjusted. Normally select this option.
Fine ....................... Select this option if fine adjustment is needed. It takes more time to switch to the source than when “Nor-
mal” is selected.
Adjusting Position/Clock (when Auto Adjust is off)
This allows you to manually adjust the image horizontally and vertically, and adjust Clock and Phase.
[Horizontal/Vertical]
Adjusts the image location horizontally and vertically.
This adjustment is made automatically when the Auto Adjust is turned on.
[Clock] (available for RGB and HDTV signals only)
Use this item with the “Auto Adjust off ” to fine tune the computer image or to remove any vertical banding that
might appear. This function adjusts the clock frequencies that eliminate the horizontal banding in the image. This
adjustment may be necessary when you connect your computer for the first time. This adjustment is made auto-
matically when the Auto Adjust is turned on. 
						

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5. Using On-Screen Menu
[Phase] (available for RGB and HDTV signals only)
Use this item to adjust the clock phase or to reduce video noise, dot interference or cross talk. (This is evident
when part of your image appears to be shimmering.)
Use “Phase” only after the “Clock” is complete.
This adjustment is made automatically when the Auto Adjust is turned on.
Selecting Communication Speed [Communication Speed]
This feature sets the baud rate of the PC Control port (DIN 8 Pin). It supports data rates from 4800 to 19200 bps.
The default is 19200 bps.
Select the appropriate baud rate for your equipment to be connected (depending on the equipment, a lower baud rate
may be recommended for long cable runs).
 Menu Descriptions & Functions [Information]
Displays the status of the current signal, remaining lamp (%), lamp/filter/projector usage time (hours) and version
information. The Information has two pages. The Information included is as follows:
[Page 1]
Remaining Lamp Time (%)*
Lamp Hour Meter (H)
Filter Usage
Projector Usage
*The progress indicator shows the percentage of remaining bulb life. The value informs you of the amount of
lamp usage. 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.
BIOS Version
Firmware Version
Data Version
Model
VT676/VT670/
VT470
VT575/VT47Lamp life(H)
Normal Eco
2000 3000
3000 4000Replacement lamp
VT75LP
VT70LP 
						

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5. Using On-Screen Menu

 Menu Descriptions & Functions [Default]
Returning to Factory Default [Factory Default]
The Factory Default feature allows you to change adjustments and setting to the factory preset.
[Current Signal]
Resets the adjustments for the current signal to the factory preset levels.
The items that can be reset are: Brightness, Contrast, Color, Hue, Sharpness, Noise Reduction, Aspect Ratio,
Horizontal Position, Vertical Position, Clock, Phase and Picture Management.
[All Data]
Reset all the adjustments and settings for all the signals to the factory preset for source except the following:
Language, Security, Communication Speed, Remaining Lamp Time, Lamp Hour Meter, Filter Usage and Projector
Usage. To reset the lamp usage time, see “Clear Lamp Hour Meter” and “Clear Filter Usage”.
Resetting the Filter Usage Hours [Clear Filter Usage]
Resets the filter usage back to zero. Selecting this option displays submenu for a confirmation. Select “Yes” and press
the ENTER button.
Clearing Lamp Hour Meter [Clear Lamp Hour Meter]
Resets the lamp clock back to zero. Selecting this option displays submenu for a confirmation. Select “Yes” and press
the ENTER button.
NOTE: The projector will turn off and go into standby mode after 2100* hours (up to 3100* 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.
When the lamp time clock is reset to zero, the LAMP indicator goes out.
Do this only after replacing the lamp.
* VT575 and VT47: 3100 hours (up to 4100 hours in Eco mode).
[Page 2]
Source Index
Horizontal Frequency
Vertical Frequency
Sync Polarity
Signal Type
Video Type
Sync Type
Interlace 
						

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6. Maintenance
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This section describes the simple maintenance procedures you should follow to clean the filter and replace the lamp.

 Cleaning or Replacing the Filter
The air-filter sponge keeps dust and dirt from getting inside the projector 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 projector, turn off the main power switch 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 the filter cover.
To clean the air-filter:
Vacuum the filter-through the filter cover.
To reset the filter usage time, from the menu, select [Default] → [Clear Filter Usage].
See also page 47 for resetting the filter usage time.
To replace the filter (sponge):
1. Remove the filter cover by pushing down on the catch of the cover until you feel it detach.
Catch
2. Gently peel off the filter (sponge) and replace it with the new one. 
						

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6. Maintenance
3. Reinstall the new filter cover.
NOTE: Do not wash the filter with soap and water. Soap and water will damage the filter membrane. Before replacing the filter,
remove dust and dirt from the projector cabinet. Keep out dust and dirt during filter replacement.
NOTE: When you replace the lamp, it is also wise to replace the filter. The filter comes in the same package with your replacement
lamp.
 Cleaning the Cabinet and the Lens
1. Turn off the projector before cleaning.
2. Clean the cabinet periodically with a damp cloth. If heavily soiled, use a mild detergent. Never use strong
detergents or solvents such as alcohol or thinner.
3. Use a blower or lens paper to clean the lens, and be careful not to scratch or mar the lens.
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 Replacing the Lamp
After your lamp has been operating for 2000* hours (up to 3000* hours in Eco mode) or longer, the LAMP indicator in
the cabinet will blink red and the message “The lamp has reached the end of its usable life. Please replace the
lamp.” will appear. Even though the lamp may still be working, replace it at 2000* (up to 3000* hours in Eco mode)
hours to maintain optimal projector performance. After replacing the lamp, be sure to clear the lamp hour meter. See
page 47.
CAUTION
•DO NOT TOUCH THE LAMP immediately after it has been used. It will be extremely hot. Turn the projector off,
wait 30 seconds, turn off the main power switch and then disconnect the power cable. Allow at least one hour
for the lamp to cool before handling.
•DO NOT REMOVE ANY SCREWS except two lamp case screws. You could receive an electric shock.
•Do not break the glass on the lamp housing.
Keep finger prints off the glass surface on the lamp housing. Leaving finger prints in the glass surface might
cause an unwanted shadow and poor picture quality.
•The projector will turn off and go into standby mode after 2100* (up to 3100* hours in Eco mode) hours of
service. If this happens, be sure to replace the lamp. If you continue to use the lamp after 2000* hours (up to
3000* hours in 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.
*NOTE: Lamp life for VT575/VT47 is 3000 hours in Normal mode and 4000 hours in Eco mode.
The projector will turn off and go into standby mode after 3100 (up to 4100 hours in Eco mode) hours of service.
To replace the lamp:
 Optional lamp and tools needed for replacement:
•Replacement lamp VT75LP (VT676/VT670/VT470) or VT70LP (VT575/VT47)
•Phillips screwdriver or equivalent
NOTE: The two lamp houses are slightly different in appearance.
The following explanation uses drawings for the lamp VT75LP.
1. Place the projector on a soft cloth and turn it over to access the lamp cover on the bottom.
6. Maintenance
2. Use a Philips screwdriver to push and release the tab.
Push up and remove the lamp cover.
CatchPhilips
screwdriver 
						

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3. Loosen the two screws securing the lamp housing until the phillips screwdriver goes into a freewheeling
condition. The two screws are not removable.
Remove the lamp housing by holding it.
6. Maintenance
NOTE: There is an interlock on this case to prevent the risk of electrical shock. Do not attempt to circumvent this 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 replacement lamp VT75LP (VT676/VT670/VT470) or VT70LP (VT575/
VT47).
Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
5. Reattach the lamp cover.
Slip the lamp cover back until it snaps into place.
Interlock 
						

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6. Maintenance
6. Connect the supplied power cable, turn on the Main Power switch and turn on the projector.
7. Finally, select the menu 
→ [Default] → [Clear Lamp Hour Meter] to reset the lamp usage hours.
NOTE: When the lamp exceeds 2100* hours (up to 3100* hours in Eco mode) of service, the projector cannot turn on and the
menu is not displayed.
If this happens, press the HELP button on the remote control for ten seconds to reset the lamp clock back to zero.
When the lamp time clock is reset to zero, the LAMP indicator goes out.
* VT575 and VT47: 3100 hours (up to 4100 hours in Eco mode). 
						

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7. Appendix

 Troubleshooting
This section helps you resolve problems you may encounter while setting up or using the projector.
Indicator Messages
Power Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightGreen
Orange
Green
Orange0.5 sec On,
0.5 sec Off
2.5 sec On,
0.5 sec Off
0.5 sec On,
0.5 sec OffThe main power is off
The projector is getting ready to turn on.
Off Timer is enabled.
The projector is cooling down.
The projector is turned on.
The projector is in Standby.–
Wait for a moment.
–
Wait for a moment.
–
–
Status Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightRed
Green
Orange1 cycle (0.5 sec On,
2.5 sec Off)
2 cycle (0.5 sec On,
0.5 sec Off)
4 cycle (0.5 sec On,
0.5 sec Off)
6 cycle (0.5 sec On,
0.5 sec Off)Normal
Lamp cover error or lamp housing error
Temperature error
Fan error
Lamp error
Re-firing the lamp (The projector is cool-
ing down.)
Cabinet button is locked–
Replace the lamp cover or lamp
housing correctly.
The projector is overheated. Move
the projector to a cooler location.
Fans will not work correctly.
Lamp fails to light. Wait a full
minute and then turn on again.
The projector is re-firing.
Wait for a moment.
You have pressed cabinet button
when Cabinet Button is locked.
Lamp Indicator
Indicator Condition
Projector Condition Note
Off
Blinking light
Steady lightNormal
Lamp has reached its end of life. Lamp
replacement message will be displayed.
Lamp has been used beyond its limit. The
projector will not turn on until the lamp is
replaced.
Lamp mode is set to Eco mode Red
Red
Green–
Replace the lamp.
Replace the lamp.
–