NEC Nc900ca Manual

51
 
5.
Maintenance \bf Y\bur 
\fr\bject\br
NOTEPlease request your dealer\fi to perform cleaning of the p\firojector inside.
5-1. Cleaning the Cabinet
Before carrying out maintenance of your projector, \fe sure to always check that the projector is turned off and the power plug 
is unplugged from the electrical \fioutlet.
• Wipe with a dry, soft cloth witho\fiut nap. 
  When the ca\finet is excessively dirty, wipe with cloth well wrung after \feing dampened with a neutral detergent diluted with 
water...

52
5. Maintenance of \fiYour Projector
5-3. Replacing the Lamp an\ld the Air Filter
5-3-1. Warnings About Replacing the Lamp
When the usage time of the lamp \feing used as the light source exceeds the lamp replacement time (approximate), the mes-
sage “Lamp1 OverTime” or “Lamp2 OverTime” is displayed on the projector LCD screen. When this happens, the lamp has 
reached its replacement time an\fid you should replace it with a n\fiew lamp.
TIP•   The lamp replacement time (a\fipproximate) is 3,000...

53
5. Maintenance of \fiYour Projector
5-3-2. Warnings About Replacing the Air Filter
Air filters are attached over the air inlet of the projector to prevent dust. Replace air filters periodically to maintain the projector’s 
performance.
 WARNING:
• 
When replacing air filters\fi, turn off the projector and unplug \fithe power ca\fle.
•  Dust in air filters will hinder ventilation of the projector, lead to a rise of the internal temperature and can cause a fire or 
malfunction.
 CAUTION
Before replacing...

54
5. Maintenance of \fiYour Projector
5-3-3. Procedure for Replacing the Lamp an\ld Air Filter
• Step 1
Replace the lamp (\fiSee page 54)
• Step 2
Replace the rear air filter (See \fipage 59)
Replace the side a\fiir filter (See page \fi62)
• Step 3
Reset the lamp usa\fige time and air filt\fier usage time (See \fipage 64)
5-3-4. Replacing the Lamp
This section descr\fii\fes the procedure for replacing \foth of th\fie lamps.
\freparati\bn:  Have a Phillips he\fiad screwdriver ready.
1 Remove the lamp...

55
5. Maintenance of \fiYour Projector
2 Remove the lamp housing.
  1.  
Loosen the two screws securing the lamp housing until the Phillips screwdriver goes into a 
freewheeling condition.
The two screws are not remova\fle.
  2.  
Grasp the handle and \lremove the lamp housing.
At this time, pull\fi the lamp housing s\fitraight out.
 CAUTION
Make sure that lamp housin\fig is cool enough to\fi handle \fefore removing it.  

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5. Maintenance of \fiYour Projector
3 Install a new lamp housing.
  1.  
Insert a new lamp housing until\l the lamp housing is\l plugged into the socket.
Finally, align the protrusion for aligning the position of the lamp housing with the groove in the receptacle side of the 
projector.
Protrusion Groove 

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5. Maintenance of \fiYour Projector
 2.  
Secure it in place with \lthe two screws.
Be sure to tighten the sc\firews.
NO TEBe sure to install \foth L\fiamp 1 and Lamp 2. \fiThe projector will not t\fiurn on unless \foth th\fie lamps are installed.
4 Reattach the lamp cover.
  1. 
 
Align the protrusions (2 locations) in the lamp cover with the receptacle holes in the projector 
and mount the lamp \lcover. 

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5. Maintenance of \fiYour Projector
 2. 
 
Tighten the screw to secure the lamp cover.
Be sure to tighten the sc\firew.
This completes replacing the lamp. \fiNext, replace the air filte\firs.
•  Replace the rear air filter (See \fipage 59)
•  Replace the side a\fiir filter (See page \fi62)
NO TEAlways replace \foth of the air filters at the same time. \bf you do not replace \foth of the air filters, the air filter usage 
time will not \fe ca\filculated correctly. 

59
5. Maintenance of \fiYour Projector
5-3-5. Replacing the Rear Air Filter
\freparati\bn: Replace the lamp fir\fist. (See page 54)
1 Open the filter cover.
  1.  
Loosen each of the\l two knobs by turning them counterclockwise.
The kno\fs are not remova\fle. \bf the kn\fio\f is too tight to \fiturn, use a Phillips \fiscrewdriver.
  2. 
 
Tilt the filter cover towards you to open it. 

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5. Maintenance of \fiYour Projector
2 Remove the air filter.
Pull the right side\fi of the air filter t\fiowards you to remove it.
3 Mount the air filter to the projector.
Look for an arrow (↑A\bR FLOW) indicating the installation direction on the side of the air filter. Point the arrow towards 
the projector.
  1. 
  Align the air filter to the flange on the left side of the air \linlet.
  2.  
Push the right side of the ai\lr filter against the air inlet\l on the projector.
Flange