BenQ Projector MX823ST User Manual

							Maintenance 51
Timing of replacing the lamp
When the Lamp indicator lights up red or a message appears suggesting it is time to 
replace the lamp, please install a new lamp or consult your dealer. An old lamp may cause a 
malfunction in the projector and in some instances the lamp may explode. 
Go to http://lamp.benq.com for a replacement lamp.
The LAMP indicator light and TEMP (Temperature) warning light will light up if the lamp becomes 
too hot. Turn the power off and let the projector cool for 45 minutes. If the Lamp or Temp indicator still lights 
up after turning the power back on, please contact your dealer. See Indicators on page 55 for details.
The following Lamp warning displays will remind you to change the lamp.
XXXX shown in the above messages are numbers that vary depending on different models.
StatusMessage
Install a new lamp for optimal performance. If the 
projector is normally run with Economic 
selected (See Getting to know the lamp hour on 
page 50), you may continue to operate the 
projector until the next hour lamp warning 
appears.
Press MODE/ENTER to dismiss the message.
It is strongly recommended that you replace the 
lamp at this age. The lamp is a consumable item. 
The lamp brightness diminishes with use. This is 
normal lamp behavior. You can replace the lamp 
whenever you notice that the brightness level has 
significantly diminished.
Press MODE/ENTER to dismiss the message.
The lamp MUST be replaced before the projector 
will operate normally.
Press MODE/ENTER to dismiss the message.
OK Order Replacement Lamp
Lamp>XXXX Hours
Order a new lamp at lamp.benq.com
Notice
OK
Notice
Replace Lamp SoonLamp>XXXX Hours
Order a new lamp at lamp.benq.com
OK
Notice
Replace Lamp NowLamp>XXXX Hours
Lamp usage time exceeded
Order a new lamp at lamp.benq.com
OK Out of Lamp Usage Time
Replace lamp (refer to User Manual)
Then reset lamp timer
Order a new lamp at lamp.benq.com
WARNING 
						

							Maintenance 52
Replacing the lamp
•  To reduce the risk of electrical shock, always turn the projector off and disconnect the power cord before 
changing the lamp.
•  To reduce the risk of severe burns, allow the projector to cool for at least 45 minutes before replacing the 
lamp.
•  To reduce the risk of injuries to fingers and damage to internal components, use caution when removing 
lamp glass that has shattered into sharp pieces.
•  To reduce the risk of injuries to fingers and/or compromising image quality by touching the lens, do not 
touch the empty lamp compartment when the lamp is removed.
•  This lamp contains mercury. Consult your local hazardous waste regulations to dispose of this lamp in a 
proper manner.
•  To assure optimal performance from the projector, it is recommended that you purchase a qualified 
projector lamp for lamp replacement.
•  If lamp replacement is performed while the projector is suspended upside-down from the ceiling, make 
sure that no one is underneath the lamp socket to avoid any possible injury or damage to the human eyes 
caused by fractured lamp.
•  Ensure good ventilation when handling broken lamps. We recommend that you use respirators, safety 
glasses, goggles or face shield and wear protective clothing such as gloves. 
1. Turn the power off and disconnect the projector from the power outlet. If the lamp 
is hot, avoid burns by waiting for approximately 45 minutes until the lamp has 
cooled.
2. Loosen the screw(s) that secures the lamp 
cover on the side of the projector until the 
lamp cover loosens.
3. Remove the lamp cover from the projector.
•  Do not turn the power on with the lamp cover 
removed.
•  Do not insert your fingers between the lamp and the 
projector. The sharp edges inside the projector may 
cause injuries.
4. Disconnect the lamp connector from the 
projector as illustrated.
5. Loosen the screw that secures the lamp.
6. Lift the handle so that it stands up.
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							Maintenance 53 7. Use the handle to slowly pull the lamp out of 
the projector.
•  Pulling it too quickly may cause the lamp to break and 
scatter broken glass in the projector.
•  Do not place the lamp in locations where water might 
splash on it, children can reach it, or near flammable 
materials.
•  Do not insert your hands into the projector after the lamp 
is removed. If you touch the optical components inside, it 
could cause color unevenness and distortion of the 
projected images.
8. As shown in the figure, lower the new lamp.
9. Tighten the screw that secures the lamp.
10. Ensure the handle is fully laid flat and locked in 
place.
11. Reconnect the lamp connector.
•  Loose screw may cause a bad connection, which could 
result in malfunction.
•  Do not over tighten the screw.
12. Replace the lamp cover on the projector.
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							Maintenance 5414. Connect the power and restart the projector.
Do not turn the power on with the lamp cover removed. 
Resetting the lamp timer
15. After the startup logo, open the On-Screen Display (OSD) menu. Go to the 
SYSTEM SETUP: Advanced > Lamp Settings menu. Press MODE/ENTER. 
The Lamp Settings page displays. Highlight Reset Lamp Timer. A warning 
message is displayed asking if you want to reset the lamp timer. Highlight Reset and 
press MODE/ENTER. The lamp time will be reset to “0”.
Do not reset if the lamp is not new or replaced as this could cause damage. 
13. Tighten the screw(s) that secures the lamp 
cover.
•  Loose screw may cause a bad connection, which could 
result in malfunction.
•  Do not over tighten the screw. 
						

							Maintenance 55
Indicators
LightStatus & Description
Powe r  ev e n t s
Orange Off OffStand-by mode.
Green
FlashingOff OffPowering up.
Green Off OffNormal operation.
Orange
FlashingOff OffNormal power-down cooling
Red Off OffDownload
Green Off RedCW start fail
Red Flashing Off OffScaler shutdown fail (data abort)
Off Red OffLAN download fail
Off Green OffLAN download processing
Green Off OffBurn-in ON
Green Green GreenBurn-in OFF
Lamp events
Off Off RedLamp1 error in normal operation
Off OffOrange 
FlashingLamp is not lit up
Thermal events
Red Red OffFan 1 error (the actual fan speed is +25% outside 
the desired speed)
RedRed 
FlashingOffFan 2 error (the actual fan speed is +25% outside 
the desired speed)
Red Green OffFan 3 error (the actual fan speed is +25% outside 
the desired speed)
Green Red OffTemperature 1 error (over limited temperature)
GreenRed 
FlashingOffThermal sensor 1 open error
Green Green OffThermal sensor 1 short error
GreenGreen 
FlashingOffThermal IC#1 I2C error connection error
Green 
FlashingRed OffTemperature 2 error (over limited temperature)
Green 
FlashingRed 
FlashingOffThermal Sensor 2 open error
Green 
FlashingGreen OffThermal Sensor 2 short error
Green 
FlashingGreen 
FlashingOffThermal IC #2 I2C Connection error 
						

							Troubleshooting 56
Troubleshooting
The projector does not turn on.
No picture
Blurred image
Remote control does not work
The password is incorrect
CauseRemedy
There is no power from the power cord.Plug the power cord into the AC power jack on 
the projector, and plug the power cord into the 
power outlet. If the power outlet has a switch, 
make sure that it is switched on.
Attempting to turn the projector on again 
during the cooling process.Wait until the cooling down process has 
completed.
CauseRemedy
The video source is not turned on or 
connected correctly.Turn the video source on and check that the signal 
cable is connected correctly.
The projector is not correctly connected 
to the input signal device.Check the connection.
The input signal has not been correctly 
selected.Select the correct input signal with the SOURCE 
key on the projector or remote control.
The lens cover is still closed. Open the lens cover.
CauseRemedy
The projection lens is not correctly 
focused.Adjust the focus of the lens using the focus ring.
The projector and the screen are not 
aligned properly.Adjust the projection angle and direction as well 
as the height of the projector if necessary.
The lens cover is still closed. Open the lens cover.
CauseRemedy
The battery is out of power. Replace the battery with new ones.
There is an obstacle between the remote 
control and the projector.Remove the obstacle.
You are too far away from the projector. Stand within 8 meters (26 feet) of the projector.
CauseRemedy
You do not remember the password.Please see Entering the password recall 
procedure on page 25 for details. 
						

							Specifications 57
Specifications
Projector specifications
All specifications are subject to change without notice.
Optical
Resolution
(MX823ST)1024 x 768 XGA
(MW824ST) 1280 x 800 WXGA
Display system 1-CHIP DMD
Lens F/Number F = 2.6
Lamp 210 W lamp
Electrical
Power supply
AC100–240V, 3.2 A, 50-60 Hz (Automatic)
Power consumption 300 W (Max); < 0.5 W (Standby)
Mechanical
Weight2.6 Kg (5.73 lbs)
Output terminals
RGB output
D-Sub 15-pin (female) x 1
Speaker (Stereo) 10 watt x 1
Audio signal output PC audio jack x 1
Control
RS-232 serial control9 pin x 1
LAN control RJ45 x 1
IR receiver x 2
USB port (Mini-B x 1)
Input terminals
Computer input RGB input D-Sub 15-pin (female) x 2
Video signal input S-VIDEO Mini DIN 4-pin port x 1
VIDEO RCA jack x 1
SD/HDTV signal input
Analog - Component RCA jack x 3 (through RGB input)
Digital - HDMI/MHL x 1
Audio signal input Audio in PC audio jack x 2
RCA audio jack (L/R) x 2
Environmental Requirements
Operating temperature0°C–40°C at sea level
Operating relative humidity 10%–90% (without condensation)
Operating altitude 0–1499 m at 0°C–35°C
1500–3000 m at 0°C–30°C (with 
High Altitude Mode on) 
						

							Specifications 58
Dimensions
Ceiling mount installation
232.6
114.4
6262
Unit: mm 287.3
84.021
137.494
77
127.7
199.613 8
175.95
577.694538.102
677.3
25
Ceiling Mount screw: M4
(Max L = 25 mm; Min L = 20 mm)
Unit: mm 
						

							Specifications 59
Wall mount installation
Minimum installation requirements
Computer 
Resolution: 
XGA 
Image 
Resolution: 
XGA
Diagram 
ReferenceSMART 
Board 
660Smart 
Board 
680Promethean 
ActivBoard 
164Promethean 
ActivBoard 
178RM 
ClassBoard2 
77.5Hitachi 
StarBoard 
FX-63StarBoard 
FX-77
Image 
Diagonal 
(inches)D6477 64 78 78 63 77
Image 
Height 
(mm)H 975 1173 975 1189 1181 960 1173
Image 
Width 
(mm)W 1300 1565 1300 1585 1575 1280 1565
Distance 
from floor 
to bottom 
of image 
(mm)
f 900 900 900 900 900 900 900
Distance 
from 
screen 
surface to 
projector 
rear case 
(mm)
a 790 950 790 970 970 780 950
Distance 
from top 
case to the 
top of 
image 
(mm)
b 94 124 94 126 126 92 124
Distance 
from top of 
wall mount 
to ceiling 
(mm)
c505050 50 50 5050
Minimum 
Ceiling 
Height 
(mm)
e 2347 2575 2347 2593 2585 2330 2575 
						

							Specifications 60
Computer Resolution: 
WXGA 
Image Resolution: WXGADiagram 
ReferenceSMART 
Board 
685Promethean 
ActivBoard 
387Hitachi 
FX-TRIO-
88WHitachi 
FX-DUO-
88W
Image Diagonal (inches)D87 87 88 88
Image Height (mm)H 1171 1171 1181 1181
Image Width (mm)W 1874 1874 1887 1887
Distance from floor to 
bottom of image (mm)f 900 900 900 900
Distance from screen surface 
to projector lens (mm)a 916 916 926 926
Distance from top case to 
the top of image (mm)b 6.8 6.8 7.5 7.5
Distance from top of wall 
mount to ceiling (mm)c50 50 50 50
Minimum Ceiling Height 
(mm)e 2461.8 2461.8 2472.5 2472.5