InFocus Projector Lp755 User Manual

							40
Maintenance & Troubleshooting
F
IGURE 30
Removing the lamp module
WARNING: Do not drop the
lamp module or touch the glass
bulb! The glass may shatter and
cause injury.
7Align the new lamp module in the correct direction.
8Gently push the module in as far as it goes.
9Tighten the screws on the outside of the module.
10Reposition the lamp door.
11Tighten the lamp door screw.
12Plug in the power cord and turn the projector back on. The 
lamp monitor light and lamp hour counter in the Status menu 
are automatically reset. 
						

							41
Replacing the Batteries in the Remote Control
The life of the batteries depends on how often and how long you 
use the remote. Symptoms of low battery charge include erratic 
responses when using the remote and a reduced range of opera-
tion.
Follow these steps to replace the batteries:
1Turn the remote face down in your hand.
2Slide the battery cover off the end of the remote by pressing 
on it with the heel of your hand.
3Remove the old batteries.
4Install two new AA alkaline batteries. Make sure you install 
each in the correct direction.
5Slide the battery cover back on the remote.
Using the Kensington Lock 
The projector has a Kensington Security Standard connector for 
use with a Kensington MicroSaver Security System (Figure 31). 
Refer to the information that came with the Kensington System 
for instructions on how to use it to secure the projector.
FIGURE 31
Installing the Kensington lock 
						

							42
Maintenance & Troubleshooting
Troubleshooting
If you’re experiencing trouble with the projector, follow these 
steps to make sure everything is properly connected before you 
call Technical Support for assistance.
1Check cable connections. Verify that all computer, CableWiz-
ard and power cables are properly connected.
2Verify that all power is switched on.
3Verify that the projector is not in standby (the Standby LED on 
the keypad is lit when the projector is in standby).
4If the projector still doesn’t display an image, restart the com-
puter.
NOTE: Macintosh computers
require a specific power-up
sequence: the projector must be
turned on before you turn on the
computer.
5If the problem still exists, unplug the cable from the computer 
and check the computer monitor ’s display. The maximum res-
olution that the projector can display is 1280x1024 pixels, pref-
erably 1024x768. The problem might be with the graphics 
controller in your computer rather than with the projector. 
When you reconnect the projector, remember to turn the com-
puter and monitor off before you power up the projector. 
Power the equipment back up in this order: projector, monitor, 
computer.
6If you’re using a laptop computer and it is not displaying your 
presentation, make sure you have activated the computer ’s 
external video output. Most laptop computers do not auto-
matically turn on their external video port when a secondary 
display device such as a projector is connected. Refer to 
page 53 for more information.
7If the problem still exists, read through the problems and solu-
tions in this chapter.  
						

							43
Solutions to Common Problems
Problem: Nothing on projection screen
•
Make sure that the power cord is properly connected to a func-
tional AC electrical outlet. Make sure that the power cord is 
also properly connected to the projector and the green Power 
LED is lit.
•If the projector is plugged into a power strip, make sure the 
power strip is turned on.
•Make sure you have removed the lens cap from the projection 
lens at the front of the projector.
•Make sure the projector is turned on.
•Check the projector ’s lamp to ensure that it is securely con-
nected in the lamp module. See “Replacing the Projection 
Lamp” on page 39.
•Make sure that the CableWizard and the cables do not have any 
bent pins. Check the power cord for bent pins also.
Problem: Color or text not being projected
•
You might need to adjust the brightness up or down until the 
text is visible. Refer to “Brightness + or -” on page 22 for more 
information.
•Verify that the appropriate input source is selected. See “Com-
puter” on page 22 or “Video” on page 23.
Problem: The screen resolution is not right
•
Make sure the computer ’s graphics card is set for a resolution 
of no greater than 1280x1024.
Problem: Image isn’t centered on the screen
•
Reposition the image. Refer to “Horizontal position” on 
page 30 and “Vertical position” on page 30.
•If you’re using an extension cable between the CableWizard 
and the projector, make sure it’s InFocus-approved. 
						

							44
Maintenance & Troubleshooting
Problem: Only the start-up screen displays
•
Verify that the cables are connected correctly. Check to see that 
the CableWizard computer cable is correctly connected to the 
monitor connector on the computer (this is the connector 
where your monitor cable usually goes.) See page 6 for connec-
tion procedures.
•Verify that the proper input source is connected. See “Com-
puter” on page 22 or “Video” on page 23.
•You might need to turn everything off and power up the equip-
ment again. Make sure you power up in this order: projector, 
computer monitor, computer. It is especially important that 
you follow this sequence for Macintosh computers.
•Make sure your computer ’s graphics board is installed and 
configured correctly.
If you’re using Windows 3.x:
1In the Windows Program Manager, double-click the Win-
dows Setup icon in the Main program group.
2Verify that the Display setting is 1280x1024 or less.
If you’re using Windows 95 or Windows 98:
1Open “My Computer” icon, the Control Panel folder and 
then the Display icon.
2Click the Settings tab.
3Verify that the Desktop area is set to 1280x1024 or less.
 Also check the following: 
•Does your computer have a compatible graphics board? The 
projector isn’t CGA or EGA compatible.
•Is your computer ’s graphics board turned on? This is espe-
cially true for laptop computers. See “Portable and Laptop 
Activation Chart” on page 53. 
						

							45
Problem: Image is too wide or narrow for screen
•
You might need to manually adjust the tracking to reduce or 
enlarge the projected image. Refer to “Manual Tracking” on 
page 30.
•Adjust the resolution of your monitor if it’s greater than 
1280x1024. Only this resolution at 75 Hz or less will display on 
the projector.
Problem: Image is out of focus
•
Turn the projection lens to focus the image.
•Make sure the projection screen is at least 4 feet (1.2m) from the 
projector.
•Make sure the projector is turned off, then check the projection 
lens to see if it needs cleaning.
Problem: Image and menus are reversed left to right
•
Rear projection mode is probably turned on. Switch back to for-
ward projection from the Controls menu. The image should 
immediately return to forward projection. See “Rear Projec-
tion” on page 32.
Problem: Image and menus are upside down
•
Ceiling mode is probably turned on. Turn off the mode from 
the Controls menu. The image should immediately return to 
forward projection. See “Ceiling Projection” on page 32.
Problem: the projector displays vertical lines, “bleeding” or spots
•
Adjust the brightness. See “Brightness + or -” on page 22.
•Make sure the projector is turned off, then check the projection 
lens to see if it needs cleaning.
Problem: no sound
•
Press the mute button.
•Adjust volume.
•Verify audio/input connections.
•Adjust audio source. 
						

							46
Maintenance & Troubleshooting
Problem: Image is “noisy” or streaked
Try these steps in this order.
1Deactivate the screen saver on your computer.
2Tu r n  
Auto Image off and then back on again. See “Auto 
Image” on page 29. 
3Adjust the synchronization and tracking manually to find an 
optimal setting. See “Manual Sync” on page 29 and “Manual 
Tracking” on page 30.
•If you’re using an extension cable between the CableWizard 
and the projector, make sure it’s InFocus-approved.
•The problem could be with your computer ’s graphics board. If 
possible, connect a different computer.
Problem: Projected colors don’t match the computer or video 
player’s colors
•
Adjust the brightness, tint and/or contrast from the Display 
menu. Just as there are differences in the displays of different 
monitors, there are often differences between the computer 
image and the projected image. See “Brightness + or -” on 
page 22, “Tint” on page 25, and “Contrast” on page 25. 
Problem: Lamp seems to be getting dimmer
•
The lamp begins to lose brightness when it has been in use for a 
long time. Replace the lamp as described in “Replacing the Pro-
jection Lamp” on page 39.
Problem: Lamp shuts off
•
A minor power surge may cause the lamp to shut off. Turn the 
projector off, wait at least 30 seconds, then turn it back on.
Problem: Remote not operating correctly
•
You might need to replace the batteries. See “Replacing the Bat-
teries in the Remote Control” on page 41.
•Make sure you’re pointing the remote at the top of the projec-
tor, or at the projection screen.
•Make sure the remote is within its operating range of 25 feet. 
						

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Before calling your dealer or InFocus Technical Support for assis-
tance, please have the following information available:
•the projector ’s serial number (located on the bottom label)
•the resolution of your computer.
Call InFocus Technical Support at 
1-800-799-9911. Support is free 
between 6 a.m. and 6 p.m. PST, Monday through Friday. Support 
is available in North America after hours and on weekends for a 
fee at 
1-888-592-6800.
Or, send us an e-mail at [email protected]
In Europe, call InFocus in The Netherlands at 
(31) 35-6474010. 
In Asia, call 
(65) 332-0659.  
						

							APPENDIX
3821-LP755 COV/DIV ENG  9/9/99  4:55 PM  Page 7 
						

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APPENDIX
Specifications
The LP755 must be operated and stored within the temperature 
and humidity ranges specified. 
Te m p e r a t u r e
Operating
50 F to 104
° F (10 C to 40° C)
Non-operating
-4 F to 158
° F (-20 to 70° C)
Humidity
Operating and non-oper. 5% to 95% relative humidity, non-condensing
Dimensions
5.2 x 11.7 x 14.7 inches (13 x 29.5 x 36.7 cm)
We i g h t
 unpacked 9.7 pounds (4.4kg)
Altitude
Operating 0 to 10,000 feet (3048 meters)
Non-operating 0 to 40,000 feet (12,192 meters)
Optics
Focus Range 4-40 feet (1.2-12m)
Lamp
Type 120-watt UHE
Remote Control
Battery Two (2) AA alkaline cells
Laser Class II laser product; wavelength 670nm; 
maximum output 1mW
Input Power Requirements
100/120VAC, 5.0/5.0A, 50/60 Hz   230 VAC, 3A, 50Hz