Epson Powerlite 77c Multimedia Projector Users Guide

Fine-tuning the Projector71
Disabling the Projector’s Buttons
You can use the Operation Lock function to disable all the projector’s 
buttons, or all except the P 
Power button. 
1. Press the 
Menu button.
2. Select the 
Settings menu and press Enter.
3. Use the up and down arrow buttons to select 
Operation Lock 
and press the 
Enter button.
4. Select 
Full Lock to disable all the buttons, or Operation Lock to 
disable all except the
 Power button. Then press Enter.
5. Select 
Yes and press Enter to...

72Fine-tuning the Projector
Restoring the Default Settings
The Reset menu lets you return most projector menu settings to their 
default values. It also lets you reset the lamp hours to their initial 
default value; see page 78 for instructions on resetting the lamp timer.
To reset most projector menu settings, select 
Reset All and press the 
Enter button to display the confirmation screen. Select Yes to reset all 
the default settings or 
No to cancel.
note
The Computer Input, Zoom 
(PowerLite S5...

73
5
Maintenance and 
Transportation
Your projector needs little maintenance. All you need to do on a 
regular basis is keep the lens clean. Any dirt or smears on the lens may 
show up on your projected image. 
You also need to periodically clean the air filter and the air intake and 
exhaust vents. A clogged air filter or air vent can block ventilation 
needed to cool the projector and cause overheating. 
The only parts you should replace are the lamp and air filter. If any 
other part needs replacing,...

74Maintenance and Transportation
Cleaning the Lens
Clean the lens whenever you notice dirt or dust on the surface. 
■Use a canister of compressed air to remove dust. 
■To remove dirt or smears on the lens, use lens-cleaning paper. If 
necessary, moisten a soft cloth with lens cleaner and gently wipe 
the lens surface.
Cleaning the Projector Case 
Before you clean the case, first turn off the projector and unplug the 
power cord. 
■To remove dirt or dust, wipe the case with a soft, dry, lint-free 
cloth....

Maintenance and Transportation75
Cleaning and Replacing the Air Filter
Clean the air filter and air intake and exhaust vent on the bottom of 
the projector after every 100 hours of use. If they are not cleaned 
periodically, they can become clogged with dust, preventing proper 
ventilation. This can cause overheating and damage the projector. 
When the filter and vent are clogged, the projector displays the 
message 
The projector is overheating. Make sure nothing is 
blocking the air vent, and clean or...

76Maintenance and Transportation3. If you need to replace the filter, slide it out, as shown.
4. Align the new filter carefully as you slide it into place. It should 
click into place.
Replacing the Lamp 
The projection lamp typically lasts for about 3000 hours of use 
(in high brightness mode) or 4000 hours (in low brightness mode). It 
is time to replace the lamp when: 
■The projected image gets darker or starts to deteriorate.
■The   lamp light is flashing orange. 
■The message Replace the Lamp...

Maintenance and Transportation77
2. If the projector has been on, allow it to cool down for at least an 
hour (or until the lamp is cool). 
3. Use the screwdriver included with the replacement lamp to loosen 
the screw holding the lamp cover (the lamp cover is located on top 
of the projector).
4. Slide the cover out, then lift it off.
5. Use the screwdriver to loosen the two screws holding the lamp in 
place. (You can’t remove the screws.) 
6. Hold the lamp as shown and pull it straight out. 
Don’t...

78Maintenance and Transportation7. Gently insert the new lamp along the guide rail. If it doesn’t fit 
easily, make sure it’s facing the correct way. Push the lamp down 
firmly where the label 
PUSH appears.
8. Once the lamp is fully inserted, tighten its screws.
9. Lower the lamp cover into place. (The opening should be almost 
covered, and the top of the cover should be flush with the top of 
the projector.) Then slide the cover closed and tighten the screw.
10. Reset the lamp timer as described in the...

Maintenance and Transportation79
3. Select the Lamp-Hours Reset option and press Enter. You see a 
confirmation screen.
4. Select 
Yes and press Enter.
5. Press 
Esc to return to the main menu or the Menu button to exit 
the menu system. 
Transporting the Projector
The projector contains many glass and precision parts. If you need to 
transport it, please follow these packing guidelines to prevent damage 
to the projector: 
■When shipping the projector for repairs, use the original 
packaging material if...

80Maintenance and Transportation