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Nec MT850 Manual

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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
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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 electrical
shock. Do not attempt to circumvent this interlock.
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SOURCE
AUTO ADJUST
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STAND BY
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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
(MT50LP). Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
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4. Reattach the lamp cover.
Tighten the lamp cover screw.
Be sure to tighten the screw.
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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 OFF or 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.
… 47 …


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