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Nec MultiSync MT840 Uživatelský manuál Strana 33

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4. MAINTENANCE
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This section describes the simple maintenance procedures you should
follow to replace the lamp, clean the filter, and replace the batteries
in the remote control.
Replacing the Lamp
After your lamp has been operating for 2000 hours or longer, the
“Status” light in the cabinet will go on and the message will appear.
Even though the lamp may still be working, replace it at 2000 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 three lamp case screws. You could receive an elec-
tric shock.
• The projector will turn off and go into stand by mode after
2100 hours of service. If this happens, be sure to replace the
lamp. If you continue to use the lamp after 2000 hours of use,
the lamp bulb may shatter, and pieces of glass may be scat-
tered 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 free-
wheeling condition and remove the lamp cover. The lamp cover
screw is not removable.
2. Loosen the two screws securing the lamp housing until the screw-
driver goes into a freewheeling condition. The three screws are
not removable.
3. Remove the lamp housing by pulling out the handle.
4. Insert a new lamp housing until the lamp housing is plugged into
the socket.
5. Secure it in place with the two screws.
Be sure to tighten the screws.
CAUTION: Do not use a lamp other than the NEC replace-
ment lamp (MT40LP).
Order this from your NEC dealer.
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 [Main Menu] → [Projector
Options] → [Setup]→[Page 2]→[Clear Lamp Hour Meter] to re-
set the lamp usage hours.
NOTE: When the lamp exceeds 2100 hours of service, 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.
NOTE: There is an interlock on this case to prevent the risk of elec-
trical shock. Do not attempt to circumvent this interlock.
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