Vivitek Projector DX831 User Manual

— 52 — 
Cleaning the Projector 
Cleaning the projector to remove dust and grime will help ensure trouble-free operation.  
 Warning: 
1. Be sure to turn off and unplug the projector about one hour before cleaning. Failure to do so 
could result in a severe burn. 
2. Use only a dampened cloth when cleaning. Do not allow water to enter the ventilation openings 
on the projector.  
3. If a little water gets into the projector interior while cleaning, leave unplugged in a well-ventilated 
room for several...

– 53 – 
Using the Kensington Lock 
 
Using the Kensington Lock 
If you are concerned about security, attach the projector to a permanent object with the Kensington 
slot and a security cable.  
 
Note: 
Contact your vendor for details on purchasing a suitable Kensington security cable.  
The security lock corresponds to Kensington’s MicroSaver Security System. If you have any 
comment, contact: Kensington, 2853 Campus Drive, San Mateo, CA 94403, U.S.A. Tel: 800-535-
4242, http://www.Kensington.com....

— 54 — 
TROUBLESHOOTING 
Common problems and solutions 
These guidelines provide tips to deal with problems you may encounter while using the projector. If 
the problem remains unsolved, contact your dealer for assistance. 
Often after time spent troubleshooting, the problem is traced to something as simple as a loose 
connection. Check the following before proceeding to the problem-specific solutions. 
 Use some other electrical device to confirm that the electrical outlet is working. 
 Ensure the...

– 55 – 
LED Error Messages 
ERROR CODE MESSAGES POWER LED 
GREEN 
LAMP LED 
RED 
TEMP LED  
RED 
System Initial Flash OFF OFF 
Ready to Power on (Standby) ON OFF OFF 
System Power on Flash OFF OFF 
Lamp Lit , System stable ON OFF OFF 
Cooling Flashing OFF OFF 
1W MCU detects scaler stops working (initial fail) 2 blinks OFF OFF 
Over Temperature OFF OFF ON 
Thermal Break Sensor error 4 blinks OFF OFF 
Lamp Fail 5 blinks OFF OFF 
Lamp Temperature shut down 5 blinks 1 blinks OFF 
Lamp Short circuit in...

— 56 — 
Problem: The image is wider at the top or bottom (trapezoid effect)  
1. Position the projector so it is as perpendicular to the screen as possible.  
2. Use the Keystone button on the remote control to correct the problem. 
Problem: The image is reversed  
Check the Projection setting on the Settings 1 menu of the OSD. 
Problem: The image is streaked  
1. Set the Frequency and Tracking settings on the Image->Computer menu of the OSD to 
the default settings. 
2. To ensure the problem is not...

– 57 – 
Audio Problems 
Problem: There is no sound 
1. Adjust the volume on the remote control.  
2. Adjust the volume of the audio source. 
3. Check the audio cable connection. 
4. Test the source audio output with other speakers. 
5. Have the projector serviced. 
Problem: The sound is distorted  
1. Check the audio cable connection. 
2. Test the source audio output with other speakers. 
3. Have the projector serviced. 
Having the Projector Serviced 
If you are unable to solve the problem, you should...

— 58 — 
HDMI Q & A 
Q. What is the difference between a “Standard” HDMI cable and a “High-Speed” HDMI 
cable? 
Recently, HDMI Licensing, LLC announced that cables would be tested as Standard or High-
Speed cables.  
˙Standard (or “category 1”) HDMI cables have been tested to perform at speeds of 75Mhz or 
up to 2.25Gbps, which is the equivalent of a 720p/1080i signal.  
˙High Speed (or “category 2”) HDMI cables have been tested to perform at speeds of 340Mhz 
or up to 10.2Gbps, which is the highest...

–
59  – SPECIFICATIONS
 
Specifications  Model   DX831 / DX931
  DW832 / DW932
 Display type   TI DMD 0.55” XGA   TI DMD 0.65” WXGA  
Resolution   XGA 1024 x 768   WXGA 1280 x 800  
Projection distance   1.2m~10m  
Projection screen size   21.5~269.7 ”   25.3” ~ 317.99”  
Projection lens   Manual Focus/ Manual   Zoom  
Zoom ratio   1.5x  
Vertical keystone correction   +/ -   40  Degree s  
Projection methods   Front,  Rear, Desktop/Ceiling (Rear, Front)  
Data compatibility   VGA, SVGA, XGA, SXGA,...

— 
60  —   Projection Distance vs. Projection Size 
Projection Distance and Size Table 
XGA 
DX831 / DX931
 I MAGE  D IAGONAL   I MAGE  W IDTH   I MAGE  H EIGHT   P ROJECTION  D ISTANCE   O FFSET - A  
INCH CM INCH CM INCH CM INCH MM
40   81.3   32   61.0   24   186.1   73.3   85  
60   121.9   48   91.4   36   279.2   109.9   127  
100   203.2   80   152.4   60   465.3   183.2   212  
150   304.8   120   228.6   90   698.0   274.8   318  
200   406.4   160   304.8   120   930.7   366.4   424  
250   508...

– 61 – 
Timing Mode Table 
SIGNAL RESOLUTION H-SYNC  
(KHZ) 
V-SYNC 
(HZ) 
COMPOSITE 
/ S-VIDEO COMPONENT RGB DVI/ 
HDMI 
NTSC － 15.734 60.0 O － － － 
PAL/SECAM － 15.625 50.0 O － － － 
VESA 
720 x 400 37.9 85.0 － － O O 
640 x 480 31.5 60.0 － － O O 
640 x 480 37.9 72.8 － － O O 
640 x 480 37.5 75.0 － － O O 
640 x 480 43.3 85.0 － － O O 
800 x 600 35.2 56.3 － － O O 
800 x 600 37.9 60.3 － － O O 
800 x 600 46.9 75.0 － － O O 
800 x 600 48.1 72.2 － － O O 
800 x 600 53.7 85.1 － － O O 
800 x 600 76.3 120.0 － － O O...