Vivitek DW3321 User manual

—i —
Copyright
This publication, including all photographs, illustrations and software, is protected under international copy-
right laws, with all rights reserved. Neither this manual, nor any of the material contained herein, may be
reproduced without written consent of the author.
© Copyright 2015
Disclaimer
The information in this document is subject to change without notice. The manufacturer makes no repre-
sentations or warranties with respect to the contents hereof and specifically disclaims any implied
warranties of merchantability or fitness for any particular purpose. The manufacturer reserves the right to
revise this publication and to make changes from time to time in the content hereof without obligation of
the manufacturer to notify any person of such revision or changes.
Trademark Recognition
Kensington is a U.S. registered trademark of ACCO Brand Corporation with issued registrations
and pending applications in other countries throughout the world.
HDMI, the HDMI Logo, and High-Definition Multimedia Interface are trademarks or
registered trademarks of HDMI Licensing LLC in the United States and other countries.
MHL, the MHL logo, and Mobile High-Definition Link are trademarks or registered
trademarks of MHL licensing, LCC.
HDBaseT™ and the HDBaseT Alliance logo are trademarks of the HDBaseT Alliance.
All other product names used in this manual are the properties of their respective owners and are
acknowledged.
Ver.: 2

—ii —
Important Safety Information
Important:
It is strongly recommended that you read this section carefully before using the projector. These
safety and usage instructions will ensure that you enjoy many years of safe use of the projector.
Keep this manual for future reference.
Symbols Used
Warning symbols are used on the unit and in this manual to alert you of hazardous situations.
The following styles are used in this manual to alert you to important information.
Note:
Provides additional information on the topic at hand.
Important:
Provides additional information that should not be overlooked.
Caution:
Alerts you to situations that may damage the unit.
Warning:
Alerts you to situations that may damage the unit, create a hazardous environment, or cause per-
sonal injury.
Throughout this manual, component parts and items in the OSD menus are denoted in bold font as in this
example:
“Push the Menu button on the remote control to open the Main menu.”
General Safety Information
Do not open the unit case. Aside from the projection lamp, there are no user-serviceable parts in
the unit. For servicing, contact qualified service personnel.
Follow all warnings and cautions in this manual and on the unit case.
The projection lamp is extremely bright by design. To avoid damage to eyes, do not look into the
lens when the lamp is on.
Do not place the unit on an unstable surface, cart, or stand.
Avoid using the system near water, in direct sunlight, or near a heating device.
Do not place heavy objects such as books or bags on the unit.

–iii –
Projector Installation Notice
Do not tilt the projector to the left or right, otherwise lamp life could decrease dramatically, and
may lead to other unpredictable damages.
There is no limit on the tilt angle upward or downward.
Allow at least 50 cm clearance around the exhaust vent.
Ensure that the intake vents do not recycle hot air from the exhaust vent.
When operating the projector in an enclosed space, ensure that the surrounding air temperature
within the enclosure does not exceed operation temperature while the projector is running, and the
air intake and exhaust vents are unobstructed.
All enclosures should pass a certified thermal evaluation to ensure that the projector does not
recycle exhaust air, as this may cause the device to shutdown even if the enclosure temperature is
with the acceptable operation temperature range.
Minimum 500mm
(19.69 inch)
Minimum 500mm
(19.69 inch)
Minimum 500mm
(19.69 inch)
Minimum 500mm
(19.69 inch)
Minimum 500mm
(19.69 inch)
Minimum 300mm
(11.81 inch)
Minimum 100mm
(3.94 inch)

—iv —
Verify Installation Location
To supply power, the 3-blade (with earthing lead) socket should be used to ensure proper
grounding and equalized ground potential for all of the equipment in the Projector System.
The power code provided with the Projector should be used. In case of any missing item, other
qualified 3-blade (with earthing lead) power cord can be used as substitution; however, do not use
2-blade power cord.
Verify if the voltage is stable, grounded properly and there is no electricity leakage.
Measure total power consumption which should not higher the safety capacity and avoid safety
issue and short circuit.
Turn on Altitude Mode when located in high altitude areas
The projector can only be installed upright or inverted.
When installation the bracket, make sure the weight limit is not exceed and firmly secured.
Avoid installing near air conditioner duct or subwoofer.
Avoid installing at high temperature, insufficient cooling and heavy dust locations.
Keep your product away from fluorescent lamps (>1 meter) to avoid malfunction
caused by IR interference
The VGA IN connector should be connected to the VGA IN port. Note that it should be inserted
tightly, with the screws on both sides securely fastened to ensure proper connection of the signal
wire for achieving optimal display effect.
The AUDIO IN connector should be connected to the AUDIO IN port and CANNOT be connected
to AUDIO OUT or other ports like BNC, RCA; otherwise, it will lead to mute output and even
DAMAGE the port.
Install the projector above 200cm to avoid damage.
The power cord and signal cable should be connected before power on the projector. During the
projector starting and operating process, DO NOT insert or remove the signal cable or the power
cord to avoid damaging the projector.
Cooling notes
Air outlet
Make sure the air outlet is 50cm clear of any obstruction to ensure proper cooling.
Air outlet location should not be in front of the lens of other projector to avoid causing illusions.
Keep the outlet at least 100cm away from the inlets of other projectors
The projector generates a massive amount of heat during use. The internal fan dissipates the heat
of the projector when shutting down, and such process may continue for a certain period. After the
project enters STANDBY MODE status, press the AC power button to turn off the projector and
remove the power cord. DO NOT remove the power cord during the shutdown process, as it may
cause damage to the projector. In the meantime, the delayed heat radiating will also affect the
service life of the projector. The shutdown process may vary depending on the model used.
Whatever the case may be, be sure to disconnect the power cord till after the projector enters the
STANDBY status.
Air inlet
Make sure there is no object blocking air input within 30 cm.
Keep the inlet away from other heat sources
Avoided heavy dust area

–v –
Power Safety
Only use the supplied power cord.
Do not place anything on the power cord. Place the power cord where it will not be in the way of
foot traffic.
Remove the batteries from the remote control when storing or not in use for a prolonged period.
Replacing the Lamp
Replacing the lamp can be hazardous if done incorrectly. See Replacing the Projection Lamp on page 63
for clear and safe instructions for this procedure. Before replacing the lamp:
Unplug the power cord.
Allow the lamp to cool for about one hour.
Cleaning the Projector
Unplug the power cord before cleaning. See Cleaning the Projector page 66.
Allow the lamp to cool for about one hour.
Regulatory Warnings
Before installing and using the projector, read the regulatory notices in the Regulatory Compliance on
page 83.
Important Recycle Instructions:
Lamp(s) inside this product contain mercury. This product may contain other electronic waste that
can be hazardous if not disposed of properly. Recycle or dispose in accordance with local, state, or federal
Laws. For more information, contact the Electronic Industries Alliance at WWW.EIAE.ORG. For lamp
specific disposal information check WWW.LAMPRECYCLE.ORG.
Symbol Explanations
DISPOSAL: Do not use household or municipal waste collection services for
disposal of electrical and electronic equipment. EU countries require the use
of separate recycling collection services.

—vi —
Main Features
Lightweight unit, easy to pack away and transport.
Compatible with all major video standards including NTSC, PAL, and SECAM.
A high brightness rating allows for presentations in daylight or in lit rooms.
Flexible setup allows for front, rear projections.
Line-of-vision projections remain square, with advanced keystone correction for angled
projections.
Input source automatically detected.
High brightness for projection in just about any environment.
Supports resolutions up to WUXGA for clear and crisp images.
DLP® and BrilliantColor™ technologies from Texas Instruments.
Centered lens for easy installation.
Horizontal and vertical lens shift.
MHL device compatibility for streaming of video and audio content from a compatible mo-
bile device.
Built-in speaker with multiple audio-in and audio-out ports.
Network ready for integration and system administration via RJ45.
Sealed engine to minimizing the impact of dust and smoke.
Top sided lamp cover for simple lamp removal and insertion.
Anti-theft security features include: Kensington security slot, security bar.
About this Manual
This manual is intended for end users and describes how to install and operate the DLP projector. Wher-
ever possible, relevant information—such as an illustration and its description—has been kept on one
page. This printer-friendly format is both for your convenience and to help save paper, thereby protecting
the environment. It is suggested that you only print sections that are relevant to your needs.

–vii –
Table of Contents
GETTING STARTED........................................................................................................................................................... 1
PACKING CHECKLIST........................................................................................................................................................... 1
VIEWS OF PROJECTOR PARTS............................................................................................................................................... 2
Front-right View............................................................................................................................................................ 2
Top view—On-Screen Display (OSD) buttons and LEDs...................................................................................... 3
Rear view....................................................................................................................................................................... 4
Bottom view................................................................................................................................................................... 6
REMOTE CONTROL PARTS ................................................................................................................................................... 7
REMOTE CONTROL OPERATING RANGE............................................................................................................................. 10
PROJECTOR AND REMOTE CONTROL BUTTONS.................................................................................................................. 10
SETUP AND OPERATION............................................................................................................................................... 11
INSERTING THE REMOTE CONTROL BATTERIES ................................................................................................................. 11
STARTING AND SHUTTING DOWN THE PROJECTOR............................................................................................................. 12
ADJUSTING THE PROJECTOR LEVEL................................................................................................................................... 14
ADJUSTING PROJECTED IMAGE POSITION USING LENS SHIFT............................................................................................ 15
Adjusting the vertical image position....................................................................................................................... 16
Adjusting the horizontal image position .................................................................................................................. 17
ADJUSTING THE ZOOM,FOCUS AND KEYSTONE ................................................................................................................ 18
ADJUSTING THE VOLUME .................................................................................................................................................. 19
ON-SCREEN DISPLAY (OSD) MENU SETTINGS...................................................................................................... 20
OSD MENU CONTROLS ..................................................................................................................................................... 20
Navigating the OSD................................................................................................................................................... 20
SETTING THE OSD LANGUAGE.......................................................................................................................................... 21
OSD MENU OVERVIEW ..................................................................................................................................................... 22
PICTURE >> BASIC MENU............................................................................................................................................... 26
PICTURE >> ADVANCED MENU ...................................................................................................................................... 27
HSG Adjustment......................................................................................................................................................... 28
User Color Temp........................................................................................................................................................ 28
White Balance............................................................................................................................................................. 29
DISPLAY MENU............................................................................................................................................................... 30
4 Corner....................................................................................................................................................................... 31
Pincushion................................................................................................................................................................... 32
PC Detail Adjustment................................................................................................................................................. 33
3D Setting.................................................................................................................................................................... 34
SYSTEM SETUP >> BASIC MENU................................................................................................................................... 35
Presentation Timer..................................................................................................................................................... 36
Menu Settings............................................................................................................................................................. 36
SYSTEM SETUP >> ADVANCED MENU .......................................................................................................................... 37
Audio Settings............................................................................................................................................................. 38
Lamp Settings............................................................................................................................................................. 38
Closed Caption........................................................................................................................................................... 39
Network Settings........................................................................................................................................................ 39
BROWSER BASED MANAGEMENT ...................................................................................................................................... 44
PWPRESENTER ................................................................................................................................................................... 47
Using the Broadcasting Function............................................................................................................................. 53
Remote Desktop Control through pwPresenter..................................................................................................... 55
Presenting From a USB Reader.............................................................................................................................. 57
RS232 BY TELNET FUNCTION............................................................................................................................................ 59
Quick Start-Guide for TELNET................................................................................................................................. 59
INFORMATION MENU.................................................................................................................................................... 62
MAINTENANCE AND SECURITY.................................................................................................................................. 63
REPLACING THE PROJECTION LAMP................................................................................................................................... 63
CLEANING THE PROJECTOR................................................................................................................................................ 66
Cleaning the Lens...................................................................................................................................................... 66
Cleaning the Case...................................................................................................................................................... 66

—viii —
Cleaning the Air Filter................................................................................................................................................ 67
USING THE PHYSICAL LOCK .............................................................................................................................................. 70
Using the Kensington Security Slot......................................................................................................................... 70
Using the Security Bar Lock..................................................................................................................................... 70
TROUBLESHOOTING...................................................................................................................................................... 71
COMMON PROBLEMS AND SOLUTIONS............................................................................................................................... 71
TIPS FOR TROUBLESHOOTING ............................................................................................................................................ 71
LED ERROR MESSAGES..................................................................................................................................................... 72
IMAGE PROBLEMS.............................................................................................................................................................. 73
LAMP PROBLEMS............................................................................................................................................................... 73
REMOTE CONTROL PROBLEMS .......................................................................................................................................... 74
AUDIO PROBLEMS ............................................................................................................................................................. 74
HAVING THE PROJECTOR SERVICED .................................................................................................................................. 74
HDMI Q&A .................................................................................................................................................................... 75
SPECIFICATIONS............................................................................................................................................................. 76
SPECIFICATIONS................................................................................................................................................................. 76
PROJECTION DISTANCE VS.PROJECTION SIZE.................................................................................................................... 78
Projection Distance and Size Table......................................................................................................................... 78
TIMING MODE TABLE........................................................................................................................................................ 79
PROJECTOR DIMENSIONS ................................................................................................................................................... 82
REGULATORY COMPLIANCE....................................................................................................................................... 83
FCC WARNING.................................................................................................................................................................. 83
CANADA ............................................................................................................................................................................ 83
SAFETY CERTIFICATIONS................................................................................................................................................... 83
APPENDIX I........................................................................................................................................................................ 84
RS232 PIN ASSIGNMENTS (PROJECTOR SIDE).................................................................................................................... 84
RS-232C PROTOCOL.......................................................................................................................................................... 84

—1 —
GETTING STARTED
Packing Checklist
Carefully unpack the projector and check that the following items are included:
Projector
Remote Control
(Batteries Included)
VGA Cable
Power Cord
CD-ROM
(This User's Manual)
Warranty Card
Quick Start Card
Contact your dealer immediately if any items are missing, appear damaged, or if the unit does not work. It is
recommend that you keep the original packing material should you ever need to return the equipment for
warranty service.
Caution:
Avoid using the projector in dusty environments.

—2 —
Views of Projector Parts
Front-right View
ITEM
LABEL
DESCRIPTION
SEE PAGE:
1.
Lamp Cover
Remove cover to replace lamp.
63
2.
Tilt Adjuster
Rotate adjuster lever to adjust angle position.
14
3.
Lens
Projection Lens.
4.
IR Receiver
Receives IR signal from remote control.
7
5.
LEDs
Displays the projector status.
3
6.
Vent
Cool air intake.
67
7.
Function Keys
On-Screen Display (OSD) buttons.
3
8.
Vertical Lens Shift
Adjusts the image position vertically.
16
9.
Horizontal Lens Shift
Adjusts the image position horizontally.
17
10.
Zoom Ring
Enlarges the projected image.
18
11.
Focus Ring
Focuses the projected image.
18
Important:
Ventilation openings on the projector allow for good air circulation, which keeps the projector lamp
cool. Do not obstruct any of the ventilation openings.

–3 –
Top view—On-Screen Display (OSD) buttons and LEDs
ITEM
LABEL
DESCRIPTION
SEE PAGE:
1.
Power LED
Display the power on/off sequence status.
72
2.
Lamp LED
Display the lamp status.
72
3.
Temp LED
Display the thermal status.
72
4.
Filter LED
Display the filter replacing warning message.
72
5.
▲(Up Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Vertical Keystone.
20
6.
MENU
Opens and exits OSD menus.
20
7.
◄(Left Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Horizontal Keystone.
20
8.
SOURCE
Enter the Source menu.
9.
▼ (Down Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Vertical Keystone.
20
10.
Power
Turn the projector on or off.
12
11.
ENTER
Enter or confirm highlighted OSD menu item.
20
12.
►(Right Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Horizontal Keystone.
20
13.
AUTO
Optimizes image size, position, and resolution.

—4 —
Rear view
ITEM
LABEL
DESCRIPTION
SEE PAGE:
1.
HDMI 1 /MHL
Connect the HDMI/MHL cable from an HDMI/MHL device.
Note: Set the Source to HDMI 1/MHL also can be charging connected
MHL compatible smart device as long as the projector Power
On.
2.
HDMI 2
Connect the HDMI cable from an HDMI device.
3.
RJ45 (HDBaseT)
(Available in DW3321)
Connect an RJ45 Cat5e/Cat6 cable for HDBaseT signal received.
4.
DVI-D
Connect the DVI CABLE to a display.
5.
RS-232
Connects RS-232 serial port cable for remote control.
6.
VGA OUT
Connect an RGB cable to a display (Pass through by VGA1 only).
7.
S-VIDEO
Connect a S-VIDEO cable from a video device.
8.
VGA 1
Connect an RGB cable from a computer or a video enabled device.
9.
BNC
Connect a BNC cable from a computer.
10.
VGA 2
Connect an RGB cable from a computer or a video enabled device.
11.
RJ45 (LAN)
Connect a LAN cable from Ethernet.
12.
USB
Connect a USB cable for USB host.
Note: Support 5V/1.0A for each port output as long as the projector
Power On.
13.
3D-SYNC OUT
Connect 3D IR glasses receiver unit.
14.
USB DISPLAY
Connect your projector to a PC through a USB cable.
15.
Kensington Security Slot
Secures to permanent object with a Kensington Lock
system.
70

–5 –
ITEM
LABEL
DESCRIPTION
SEE PAGE:
16.
AUDIO IN
Connect an AUDIO cable from the input device.
17.
IR
Receive IR signal from remote control.
18.
12V OUT
When connected to the screen through a commercially available
cable, the screen deploys automatically on start up of the projector.
The screen retracts when the projector is powered off (see notes
below).
19.
AUDIO OUT
Connect an AUDIO cable for audio loop through.
20.
AUDIO OUT L/R
Connect an AUDIO cable for audio loop through.
21.
AUDIO IN L/R
Connect the audio cables from an audio device for VIDEO or S-
VIDEO audio input.
22.
VIDEO
Connect the composite cable from a video device.
23.
MICROPHONE
Connect the microphone input device.
24.
SERVICE
For service personnel only.
25.
WIRE REMOTE
Connect the wire remote from remote control to the projector for wire
remote control.
Connect "WIRE REMOTE OUT" to another projector (same model)
"WIRE REMOTE IN" for serial control.
26.
AC IN
Connect the POWER cable.
Note:
 To use this feature, you must plug in the connector before turn on/off the projector.
 Screen controllers are supplied and supported by screen manufacturers.
 Do not use this jack for anything other than intended use.
Warning:
As a safety precaution, disconnect all power to the projector and connecting devices before making
connections.

—6 —
Bottom view
ITEM
LABEL
DESCRIPTION
SEE PAGE:
1.
Tilt Adjustor
Rotate adjuster lever to adjust angle position.
14
2.
Ceiling Mount Holes
Contact your dealer for information on mounting the projector on a
ceiling.
Note:
When installing, ensure that you use only UL Listed ceiling mounts.
For ceiling installations, use approved mounting hardware and M4 screws with a maximum screw
depth of 6 mm (0.23 inch).
The construction of the ceiling mount must be of a suitable shape and strength. The ceiling mount
load capacity must exceed the weight of the installed equipment, and as an additional precaution
be capable of withstanding three times the weight of the equipment (not less than 5.15 kg) over a
period of 60 seconds.

–7 –
Remote Control Parts
Important:
1. Avoid using the projector with bright fluorescent lighting turned on. Certain high-frequency fluo-
rescent lights can disrupt remote control operation.
2. Be sure nothing obstructs the path between the remote control and the projector. If the path be-
tween the remote control and the projector is obstructed, you can bounce the signal off certain
reflective surfaces such as projector screens.
3. The buttons and keys on the projector have the same functions as the corresponding buttons on
the remote control. This user’s manual describes the functions based on the remote control.
Note:
Complies with FDA performance standards for laser products except for deviations pursuant to
Laser Notice No. 50, dated June 24, 2007
Caution:
Use of controls, adjustments or performance of procedures other than those specified herein
may result in hazardous laser light exposure.
！

—8 —
ITEM
LABEL
DESCRIPTION
SEE PAGE:
1.
IR Transmitter
Transmits signals to projector.
2.
Power On
Turns the projector on.
12
3.
PC
Displays the VGA1/VGA2/PC source selection (toggle).
4.
HDMI
Displays the HDMI1/HDMI 2/DVI source selection (toggle).
5.
USB
Displays the USB source selection.
6.
▲ (Up Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Vertical Keystone.
20
7.
MENU
Opens the OSD.
20
8.
◄(Left Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Horizontal Keystone.
20
9.
Keystone
Opens the Keystone menu.
10.
▼ (Down Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Vertical Keystone.
20
11.
Laser
Press to operate the on-screen pointer. DO NOT POINT IN EYES.
12.
Play/Pause
Play or pause video/music for MHL.
13.
Reverse
Reverse in set increments for MHL.
14.
Prev
Play the previous item on the programming list for MHL.
15.
Stop
Stop video/music playing for MHL.
16.
Source/ID
Alternate input source.
Combo key function for Remote Control customer
code settings (ID + Number).
20
17.
Auto/0
Auto adjustment for frequency, phase, and position.
Number for Remote ID setting used.
20
18.
Brightness
Displays the brightness setting bar.
19.
Lamp
Displays the lamp selections.
20.
Freeze
Freezes/unfreezes the on-screen picture.
21.
Blank/6
Makes the screen blank.
Number for Remote ID setting used.
22.
Laser
Use as on-screen pointer. DO NOT POINT IN EYES.
23.
Power Off
Turns the projector off.
12
24.
Video/S-Video
Displays the VIDEO/S-VIDEO source selection.
25.
Network
Displays the Network source selection.
26.
HDBaseT
Displays the HDBaseT source selection.
27.
EXIT
Return to last OSD page.
28.
ENTER
Enters and confirms settings in the OSD.
20
29.
►(Right Cursor) /
Navigates and changes settings in the OSD.
Quick Menu –For Horizontal Keystone.
20
30.
MHL
Enable the Mobile High-Definition Link technology feature for smart
devices.
31.
Forward
Forward in set increments for MHL.
32.
Next
Play the following item on the programming list for MHL.

–9 –
ITEM
LABEL
DESCRIPTION
SEE PAGE:
33.
Volume/1
Displays the Volume setting bar.
Number for Remote ID setting used.
34.
Contrast/2
Displays the Contrast settings bar.
Number for Remote ID setting used.
35.
Mute/3
Mutes the built-in speaker.
Number for Remote ID setting used.
36.
Zoom/4
Displays the digital zoom settings bar.
Number for Remote ID setting used.
18
37.
3D/5
Enable 3D feature.
Number for Remote ID setting used.
38.
Status/7
Opens the OSD Status menu (the menu only opens when an input
device is detected).
Number for Remote ID setting used.
39.
Wired Jack
Connect wire remote to the projector.
Note:
Remote Combo Key Settings:
ID+0: Reset Remote Control customer code to default settings.
ID+1: Set Remote Control customer code to "1".
~
ID+7: Set Remote Control customer code to "7".
Projector also need setting ID for unique control. Projector ID settings see page 37.
Note:
When the projector is under MHL mode, The keypad on projector should be with the same defini-
tion of the key on remote control.
When MHL function:
MENU for App settings, ▲Up, ▼Down, ◄Left and ►Right are used as directional arrows, also
included ENTER and EXIT.
Controlling your smart device with the remote control:
When the projector projects the contents from your MHL compatible smart device, you can use the
remote control to control your smart device.
To enter the MHL mode, the following buttons are available for controlling your smart device, Arrow
keys (▲Up, ▼Down, ◄Left, ►Right), MENU, EXIT, MHL control buttons.

—10 —
Remote Control Operating Range
The remote control uses infrared transmission to control the projector. It is not necessary to point the
remote directly at the projector. Provided you are not holding the remote perpendicular to the sides or the
rear of the projector, the remote will function well within a radius of about 7 meters (23 feet) and 15
degrees above or below the projector level. If the projector does not respond to the remote control, move a
little closer.
Projector and Remote Control Buttons
The projector can be operated using the remote control or the buttons on the top of the projector. All
operations can be carried out with the remote control; however, the buttons on the projector are limited in
use.

–11 –
SETUP AND OPERATION
Inserting the Remote Control Batteries
1.
Remove the battery compartment
cover by sliding the cover in the direc-
tion of the arrow.
2.
Insert the battery with the positive
side facing up.
3.
Replace the cover.
Caution:
1. Only use AAA batteries (Alkaline batteries are recommended).
2. Dispose of used batteries according to local ordinance regulations.
3. Remove the batteries when not using the projector for prolonged periods.