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...

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...

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...

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...

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...

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....

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...

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...

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...