Mitsubishi Hl2750u Projector User Manual

							HL2750
LCD PROJECTOR
MODEL
HL2750U
User Manual
This User Manual is important to you.
Please read it before using your projector. 
						

							EN-2
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC 
SHOCK, DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE 
PERSONNEL.
The lightning fl ash with arrowhead symbol within an equilateral triangle is intended to alert 
the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure 
that may be of suffi cient magnitude to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to alert the user to the 
presence of important operating and maintenance (servicing) instructions in the literature 
accompanying the appliance.
WARNING:
TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION:
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD, 
RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE 
EXPOSURE.
NOTE:
SINCE THIS PROJECTOR IS PLUGGABLE EQUIPMENT, THE SOCKET-OUTLET SHALL BE INSTALLED NEAR THE 
EQUIPMENT AND SHALL BE EASILY ACCESSIBLE.
WARNING
Use the attached specifi ed power supply cord. If 
you use another power supply cord, it may cause 
interference with radio and television reception.
Use the attached RGB cable and RS-232C cable and 
the shielded LAN cable with this equipment so as to 
keep interference within the limits of a FCC Class B 
device.
This apparatus must be grounded.
DO NOT LOOK DIRECTLY INTO THE LENS WHEN 
THE PROJECTOR IS IN THE POWER ON MODE.
CAUTION
Not for use in a computer room as defi ned in the 
Standard for the Protection of Electronic Computer/
Data Processing Equipment, ANSI/NFPA 75.When using the projector in Europe:
COMPLIANCE NOTICE 
This projector complies with the requirements of 
the EC Directive 2004/108/EC “EMC Directive” and 
2006/95/EC “Low Voltage Directive”.
The electro-magnetic susceptibility has been chosen 
at a level that gains proper operation in residential 
areas, on business and light industrial premises and 
on small-scale enterprises, inside as well as outside of 
the buildings. All places of operation are characterised 
by their connection to the public low voltage power 
supply system.
WARNING
Use the attached RGB cable and RS-232C cable and 
the shielded LAN cable with this equipment so as to 
keep interference within the limits of an EN55022 Class 
B device.
Please follow WARNING instructions. 
						

							EN-3
Contents
Important safeguards ........................................................................................................................ 4
Preparing your projector .................................................................................................................... 6
Using the remote control ................................................................................................................... 9
Setting up your projector ................................................................................................................. 10
Viewing computer images ............................................................................................................... 13
Viewing video images ...................................................................................................................... 17
Menu operation ............................................................................................................................... 22
Adjusting projected images ............................................................................................................. 28
Advanced features .......................................................................................................................... 32
Indicators ......................................................................................................................................... 37
Replacing the lamp ......................................................................................................................... 38
Maintenance .................................................................................................................................... 40
Troubleshooting ............................................................................................................................... 41
Specifi cations .................................................................................................................................. 44
Trademark, Registered trademark
•  The trademark of PJLink is trademark applied for registration or registered trademark in Japan, the United States, 
and other countries and areas.
•  Other brand or product names are trademarks or registered trademarks of their respective holders.
Declaration of Conformity
Model number:   HL2750U
Trade name:   MITSUBISHI ELECTRIC 
Responsible party:  Mitsubishi Digital Electronics America, Inc.
  9351 Jeronimo Road, Irvine, CA 92618 U.S.A
Telephone number:  +1-(949) 465-6000
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 
(1)  this device may not cause harmful interference, and 
(2)  this device must accept any interference received, including interference that may cause undesired operation. Note: This symbol mark is for EU countries only.
This symbol mark is according to the directive 2002/96/EC Article 10 Information 
for users and Annex IV, and/or to the directive 2006/66/EC Article 20 Information 
for end-users and Annex II.
Your MITSUBISHI ELECTRIC product is designed and manufactured with high quality materials and components 
which can be recycled and/or reused.
This symbol means that electrical and electronic equipment, batteries and accumulators, at their end-of-life, should 
be disposed of separately from your household waste.
If a chemical symbol is printed beneath the symbol shown above, this chemical symbol means that the battery or 
accumulator contains a heavy metal at a certain concentration. This will be indicated as follows: 
Hg: mercury (0,0005%),  Cd: cadmium (0,002%),  Pb: lead (0,004%) 
In the European Union there are separate collection systems for used electrical and electronic products, batteries and 
accumulators.
Please, dispose of this equipment, batteries and accumulators correctly at your local community waste collection/
recycling centre.
Please, help us to conserve the environment we live in! 
						

							EN-4
Important safeguards
Please read all these instructions regarding your 
projector and retain them for future reference. Follow 
all warnings and instructions marked on the projector.
1. Read instructions
  All the safety and operating instructions should be 
read before the appliance is operated.
2. Retain instructions
  The safety and operating instructions should be 
retained for future reference.
3. Warnings
  All warnings on the appliance and in the operating 
instructions should be adhered to.
4. Instructions
  All operating instructions must be followed.
5. Cleaning
  Unplug this projector from the wall outlet before 
cleaning it. Do not use liquid aerosol cleaners. Use 
a damp soft cloth for cleaning.
6.  Attachments and equipment
  Never add any attachments and/or equipment 
without the approval of the manufacturer as such 
additions may result in the risk of fi re, electric 
shock or other personal injury.
7.  Water and moisture
  Do not use this projector near water or in contact 
with water.
8. Accessories
  Do not place this projector on an unstable cart, 
stand, tripod, bracket or table. Use only with a 
cart, stand, tripod bracket, or table recommended 
by the manufacturer or sold with the projector. 
Any mounting of the appliance should follow 
the manufacturer’s instructions and should use 
a mounting accessory recommended by the 
manufacturer.10. Power sources
  This projector should be operated only from the 
type of power source indicated on the marking 
label. If you are not sure of the type of power, 
please consult your appliance dealer or local 
power company.
11. Power-cord protection
  Power-supply cords should be routed so that 
they are not likely to be walked on or pinched 
by items placed upon or against them. Pay 
particular attention to cords at plugs, convenience 
receptacles, and points where they exit from the 
appliance. Do not put the power cord under a 
carpet.
12. Overloading
  Do not overload wall outlets and extension cords 
as this can result in a fi re or electric shock.
13. Objects and liquids
  Never push objects of any kind through openings 
of this projector as they may touch dangerous 
voltage points or short-out parts that could result 
in a fi re or electric shock. Never spill liquid of any 
kind on the projector.
14. Servicing
  Do not attempt to service this projector by yourself. 
Refer all servicing to qualifi ed service personnel. 
15. Damage requiring service
  Unplug this projector from the wall outlet and refer 
servicing to qualifi ed service personnel under the 
following conditions:
(a)  If the power-supply cord or plug is damaged.
(b)  If liquid has been spilled, or objects have fallen 
into the projector.
(c)  If the projector does not operate normally after 
you follow the operating instructions. Adjust 
only those controls that are covered by the 
operating instructions. An improper adjustment 
of other controls may result in damage and 
may often require extensive work by a qualifi ed 
technician to restore the projector to its normal 
operation.
(d)  If the projector has been exposed to rain or 
water.
(e)  If the projector has been dropped or the 
cabinet has been damaged.
(f)  If the projector exhibits a distinct change in 
performance - this indicates a need for service.
16. Replacement parts
  When replacement parts are required, be sure 
that the service technician has used replacement 
parts specifi ed by the manufacturer or parts 
having the same characteristics as the original 
part. Unauthorized substitutions may result in fi re, 
electric shock or other hazards.
17. Safety check
  Upon completion of any service or repair to this 
projector, ask the service technician to perform 
safety checks determining that the projector is in a 
safe operating condition.   An appliance and cart combination should be 
moved with care. Quick stops, excessive force and 
uneven surfaces may cause the appliance and cart 
combination to overturn.
9. Ventilation
  Slots and openings in the cabinet are provided 
for ventilation, ensuring reliable operation of the 
projector and to protect it from overheating. Do not 
block these openings or allow them to be blocked 
by placing the projector on a bed, sofa, rug, or 
bookcase. Ensure that there is adequate ventilation 
and that the manufacturer’s instructions have been 
adhered to. 
						

							EN-5
WARNING:
Unplug immediately if there is something 
wrong with your projector.
Do not operate if smoke, strange noise or odor comes 
out of your projector. It might cause fi re or electric 
shock. In this case, unplug immediately and contact 
your dealer.
Never remove the cabinet.
This projector contains high voltage circuitry. An 
inadvertent contact may result in an electric shock. 
Except as specifi cally explained in the User Manual do 
not attempt to service this product by yourself. Please 
contact your dealer when you want to fi x, adjust or 
inspect the projector.
Do not modify this equipment.
It can lead to fi re or electric shock.
Do not keep using the damaged projector.
If the projector is dropped and the cabinet is dam-
aged, unplug the projector and contact your dealer 
for inspection. It may lead to fi re if you keep using the 
damaged projector. 
Do not face the projector lens to the sun.
It can lead to fi re.
Use correct voltage.
If you use incorrect voltage, it can lead to fi re.
Do not place the projector on uneven surface. 
Place the projection on a leveled and stable surface 
only. Please do not place equipment on unstable 
surfaces. 
Do not look into the lens when it is operating.
It may hurt your eyes. Never let children look into the 
lens when it is on.
Do not unplug the power cord during 
operation.
It can lead to lamp breakage, fi re, electric shock or 
other trouble. It is best to wait for the fan to turn off 
before turning the main power off.
Do not touch the air outlet grille and bottom 
plate, which become hot.
Do not touch them or put other equipment in front 
of the air outlet grille. The air outlet grille and bottom 
plate, when heated, may cause injury or damage to 
other equipment. Also, do not set the projector on the desk which is easily affected by heat.
Do not look into the air outlet grille when 
projector is operating.
Heat, dust, etc. may blow out of it and hurt your eyes.
Do not block the air inlet and outlet grilles.
If they are blocked, heat may be generated inside the 
projector, causing deterioration in the projector quality 
and fi re.
Do not use fl ammable solvents (benzene, 
thinner, etc.) and fl ammable aerosols near the 
projector.
Flammable substances may ignite causing fi re or 
breakdown because the temperature inside the projec-
tor rises very high while the lamp is illuminating. 
Do not use the projector with condensation on 
it. 
It can lead to breakdown or other failure.
Place of installation
For safety’s sake, refrain from setting the projector 
at any place subjected to high temperature and high 
humidity. Please maintain an operating temperature, 
humidity, and altitude as specifi ed below.
•  Operating temperature: between +41°F (+5°C) and 
+95°F (+35°C)
•  Operating humidity: between 30% and 90%
•  Never put any heat-producing device under the 
projector so that the projector does not overheat.
•  Do not attach the projector to a place that is 
unstable or subjected to vibration.
•  Do not install the projector near any equipment that 
produces a strong magnetic fi eld. Also refrain from 
installing near the projector any cable carrying a 
large current.
•  Place the projector on a solid, vibration free surface; 
otherwise it may fall, causing serious injury to a 
child or adult, and serious damage to the product.
•  Do not stand the projector; it may fall, causing 
serious injury and damage to the projector.
•  Slanting the projector more than ±10°(right and 
left) or ±15°(front and rear) may cause trouble or 
explosion of the lamp.
•  Do not place the projector near air-conditioning 
unit, heater, or humidifi er to avoid hot or moist air to 
the exhaust and ventilation hole of the projector.
COMPLIANCE NOTICE OF FCC
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a 
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed 
and used in accordance with the instructions, may cause harmful interference to radio communications. However, 
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause 
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, 
the user is encouraged to try to correct the interference by one or more of the following measures:
•  Reorient or relocate the receiving antenna.
•  Increase the separation between the equipment and receiver.
•  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•  Consult the dealer or an experienced Radio/TV technician for help. 
Changes or modifi cations not expressly approved by Mitsubishi could void the user’s authority to operate this 
equipment.
COMPLIANCE NOTICE OF INDUSTRY CANADA
This Class B digital apparatus complies with Canadian ICES-003.
Important safeguards (continued) 
						

							EN-6
Preparing your projector
1
23 Checking accessories
The following accessories are provided with this projector. Check to be sure that all of the accessories are packed in 
the package. 
Important:
•  The attached power cords are to be used exclusively for this product. Never use them for other products.
Inserting the batteries into the remote control
1.  Remove the rear lid of the remote control.
2.  Check the polarity (+), (-) of the batteries, and set them 
correctly, inserting their (-) side fi rst.
•  If the battery is inserted from the (+) side fi rst, inserting 
the (-) side is diffi cult because the coil spring end hits on 
the battery side. If the battery is forced to insert in this 
way, the outer label of the battery may get ripped and it 
may cause a short-circuit and heating.
3.  Attach the rear lid.
Important:
•  Use two size-AA batteries (R6).
•  Replace the 2 batteries with new ones when the remote 
control is slow to operate.
Removing the batteries from the remote control
Remove the back lid of the remote control and take out the  
batteries.
Caution: 
•  Use of a battery of wrong type may cause explosion.
•  Only Carbon-Zinc or Alkaline-Manganese Dioxide type batteries should be used. 
•  Dispose of used batteries according to your local regulations. 
•  Batteries may explode if misused. Do not recharge, disassemble, or dispose of them in fi re.
•  Be sure to handle the batteries according to the instructions.
•  Load the batteries with its positive (+) and negative (-) sides correctly oriented as indicated on the remote control. 
•  Keep batteries out of reach of children and pets. 
•  Remove the batteries, if the remote control is not used for a long time. 
•  Do not combine a new battery with an old one.
•  If the solution of batteries comes in contact with your skin or clothes, rinse with water. If the solution comes in 
contact with your eyes, rinse them with water and then consult your doctor.
Cables 
Power supply parts  Remote control parts 
Power cord (two) 
(246C483-10, 246C383-20) Remote control 
(290P136-10) R6 (size-AA) 
battery (two) RS-232C cable
(246C548-10)
RGB cable for PC  
(246C521-10) 
  USB cable 
(246C509-10) 
  Audio/Video cable 
(246C381-10) 
 
Others
•  Lens cap (Attached to the 
projector)
• Lamp replacement tray 
 (857C106-10)
• CD-ROM (919C167-20)
• Safety Manual/
  Quick Start up (871D534-20)
Mini D-SUB 
15-pin 
Mini D-SUB 
15-pin D-SUB  
9-pin 
•  Used for projector control 
by computer. 
USB 4-pin (type B) 
USB 4
-pin (type A) D-SUB  
9-pin  
						

							EN-7
Overview
9 7
8
2
1
3
4
5
11 10 12 136
1
2
3
4
5
6789
1 Speaker
2  Air inlet grille/Filter cover
3 Control area 
4 ZOOM ring
5 FOCUS ring
6  Remote control sensor (Front)
7  Air outlet grille
8 Lamp cover
9  Air outlet grille
10 Remote control sensor (Rear)
11 Kensington Security Lock Standard connector
12 Lock bar (SECURITY ANCHOR)
•  Attach a chain, etc. to this lock bar to anchor the projector.
13 Terminal board
Caution:
Do not replace the lamp immediately after using the projector 
because the lamp would be extremely hot and it may cause 
burns.
Control area
1 COMPUTER/
W button
2 AUTO POSITION/
S button
3 VIDEO/
X button
4 KEYSTONE/ENTER button
5 VOLUME/
T button
6 MENU button
7 POWER button
8 POWER indicator
9 STATUS indicator
12 3
4 
5 
6 
7 12 13
11
10
9
8
Important:
•  While the menu or the screen for the keystone adjustment or password entry is being displayed or image captur-
ing is being executed, the COMPUTER, VIDEO, AUTO POSITION and VOLUME buttons function as the 
W, 
X, 
S 
and 
T buttons respectively.
•  While the menu is on the screen, the KEYSTONE button functions as the ENTER button.
1  COMPUTER/COMPONENT VIDEO IN-1 terminal (Mini 
D-SUB 15-pin)
2  COMPUTER/COMPONENT VIDEO IN-2 terminal (Mini 
D-SUB 15-pin)
3  COMPUTER/COMPONENT VIDEO DVI-D (HDCP) termi-
nal (DVI-D 24-pin)
4 LAN terminal
5  SERIAL terminal (D-SUB 9-pin)
6  USB (COMPUTER) terminal 
7 Power jack
8  Air inlet grille
9  MONITOR OUT terminal (Mini D-SUB 15-pin)
10 AUDIO OUT terminal (Mini jack)
11 AUDIO IN-1 and AUDIO IN-2 terminals (Mini jack)
•  The AUDIO IN-1 terminal is used for both COMPUTER 1 
and DVI input.
12 S-VIDEO IN terminal and audio input terminals
13 VIDEO IN terminal and audio input terminals
Terminal board
Preparating your projector (continued) 
						

							EN-8
1
2 
Preparating your projector (continued)
Bottom side
1  Adjustment foot (for vertical position)
2  Adjustment foot (for horizontal position)
1
2
COMPUTER
VIDEO S-VIDEO
DVI-D(HDCP)
HOME PageUP
END PageDOWNAUTO POSITION
KEYSTONE
ASPECT
PinP
STILL EXPAND
MUTE WALL SCREEN
12
VOLUME
3
4
5
6
7
8
9
10
11
1227
26
25
24
23
22
21
20
19
17 18
16
14
13
15CE
MENUENTER
LASER
R-CLICK
28
Remote control1 Laser aperture
2 Transmission window
3 Indicator
4 POWER button
5 VIDEO button
6 DVI-D (HDCP) button
7 HOME button
8 END button
9 Mouse pointer
10 MENU button
11 + , - (VOLUME) buttons
12 WALL SCREEN button
13 CE (Color Enhancer) button
14 MUTE button (Audio/Video)
15 EXPAND button
16 STILL button
17 PinP button
18 ASPECT button
19 KEYSTONE button
20 ENTER button
21 R-CLICK button
22 Direction buttons
23 LASER button
24 AUTO POSITION button
25 PageUP and PageDOWN buttons
26 S-VIDEO button
27 COMPUTER 1, 2 buttons
28 L-CLICK button
•  The + and - buttons are used in the KEYSTONE 
adjustment and the EXPAND mode in addition to 
the volume control. 
•  The direction buttons are used for the keystone 
adjustment and fi ne adjustment (
W and 
X buttons 
only).
•  Pressing the LASER button emits a laser beam. 
Even when you keep holding down the LASER but-
ton, it is emitted only one minute. To keep emitting 
it longer, press the LASER button again. 
•  You can disable the LASER button to prevent laser 
radiation due to misuse of the button. 
 How to disable the LASER button
 While holding the LASER button down, press the T 
button 3 times.
 How to enable the LASER button
 While holding the LASER button down, press the S 
button 3 times.
•  Whenever the batteries are replaced, the LASER 
button is enabled.
About the laser beam
This remote control is a Class 2 laser product. (Max. output: 1 mW, Wavelength: 620-640 nm)
Beam Divergence: 6 m distance about 10.0 mm x 10.0 mm (±6.0 mm)
Caution:
•  Pressing the LASER button on the remote control emits a laser beam. Do not look into the laser beam directly. Do 
not point the laser beam at anyone. Looking at the laser beam directly may damage eyesight. 
•  Use of controls or adjustments or procedures other than those specifi ed herein may result in hazardous radiation exposure.
•  This remote controller cannot be repaired.
  
   
   
or
There are 2 types of labels placed on the back of the 
remote control and either of them is placed on it. 
						

							EN-9
Using the remote control
30°  30° 30° 30°
20°
10°
20°
10°
20° 20°
Operational range of the remote control
•  Keep the remote control photo-sensor out of direct 
sunlight or fl uorescent lamp light.
•  Keep the remote control photo-sensor at least 2 m (6 
feet) away from fl uorescent lamps. Otherwise, the 
remote control may malfunction.
•  If there is an inverter-operated fl uorescent lamp 
near the remote control, the remote control opera-
tion may become unstable.
•  When you use the remote control too close to the 
remote control sensor, the remote control may not 
work correctly. 
Reception angle
Vertical directions
Vertical directions (ceiling mount)Front of projectorRear of projector
Operate the remote 
control within a distance 
of 10 m (30 feet) from the 
projector, pointing the 
light beam at the remote 
control photo-sensor 
(front or rear) of the 
projector.
When operating the remote control, keep the distance 
from the remote control to the projector via the screen 
within about 5 m (15 feet). The operable range of the 
remote control, however, depends on the characteristics 
of the screen. 
						

							EN-10
Setting up your projector
W 
A 
A=B  B 
Setting up the screen
Install the screen perpendicularly to the projector. If the screen can not be installed in such a way, adjust the 
projection angle of the projector. (See below.)
•  Install the screen and projector so that the projector’s lens is placed at the same height and horizontal position of 
the screen center. 
•  Do not install the screen where it is exposed to direct sunlight or lighting. Light directly refl ecting on the screen 
makes the projected images whitish and hard to view. 
Basic setup
Determine the distance from the screen to the projector according to the size of the images to be projected. (See 
page 12.) 
•  Depending on the installation conditions, warm air that is emitted from the exhaust vents may fl ow into the intake 
vent, causing the projector to display “TEMPERATURE!!” and then stop projecting images. 
Correcting skewed or distorted image
This projector is provided with 2 feet for adjusting 
the projection angle on the bottom surface. Adjust 
the projection angle depending on the position of 
the projector. 
Adjustment of the vertical position of the 
projector
For the best projection, project images on a fl at 
screen installed at 90 degrees to the fl oor. If 
necessary, tilt the projector using the adjustment 
foot (for the vertical position) on the bottom of the 
projector. 
1.  Tilt up the projector to the appropriate angle. 
2.  Rotate the adjustment foot (for the vertical 
position) for fi ne adjustment.
After using the projector:
3.  Put the adjustment foot (for the vertical position) 
back into the projector.
Adjustment of the horizontal position of the 
projector
Adjust the horizontal position of the projector with 
the adjustment foot (for the horizontal position) on 
the bottom. 
Adjustment foot (for the 
vertical position) Screen
Important:
•  Don’t transport the projector with its adjustment 
feet extended. Otherwise the adjustment feet 
may be damaged. 
When projected images are distorted to 
a trapezoid
When the screen and the projector are not placed 
perpendicularly to each other, projected images 
become trapezoidal. If you cannot make the 
projector and the screen perpendicular to each 
other by mechanical adjustments, adjust keystone. 
(See page 21.) 
•  When the keystone adjustment is applied, the 
correct aspect ratio may not be obtained. 
•  When the keystone adjustment is applied, the 
resolution lowers. In addition, vertical stripes ap-
pear and straight lines bend in images with com-
plicated patterns. To prevent such symptoms, 
keep the screen and the projector perpendicular 
to each other as much as possible. 
•  Though the projected image may be distorted 
momentarily when you change the setting value 
of the keystone adjustment, such symptom is not 
a malfunction. 
•  Though the projected image may be distorted 
depending on the setting value of the keystone 
adjustment and the type of the input signal, such 
symptom is not a malfunction. In such a case, 
adjust the setting value within the range where 
the projected image is not distorted. 
When fi ne streaks are seen on projected images
This is due to interference with the screen surface and is not a malfunction. Replace the screen or displace the focus 
a little. (See page 15 or 19 for focus adjustment.)