Knoll Systems Ht221 Projector User Manual

• The projector and computer will be turned on as described in Using the Projector on page 
13.  Do not turn on either the computer or unit until you read this section.  
• Please also refer to the manual of the computer to be connected. 
Connecting the remote mouse receiver to an IBM PC/AT computer 
Connect the IBM/Mac connector on the remote mouse receiver and PCs mouse port with the 
supplied serial cable. 
 
 
Connecting the remote mouse receiver to an IBM PS/2 or Macintosh compute\
r 
Connect the...

 
 
 
2) Press the POWER ON button on the remote control or the POWER button on t\
op of 
the unit to turn on the unit. 
The POWER indicator on top of the unit turns to green and start blinking. It will take one 
minute for the projector to be ready to use.  Wait until the indicator stops blinking and lights 
steadily in green. 
Note: While the POWER indicator is blinking, the unit doesnt turn off even if you press the 
POWER OFF button on the remote control or the POWER button on the unit. 
Tip: If you...

6)  Adjust the image size with the 
zoom ring lever, and then adjust the 
focus with the focus ring. 
 
 
 
 
 
 
 
 
 
7) Change the unit setting to suit to the projecting method and selected source as described 
in step 4. 
• Select the type of projection 
• If the projected image is horizontally reversed or upside down, change the projection type.  
This setting can provide the correct image. 
• Adjust the projected image from the source connected to the RGB IN connector. 
The resolutions most...

Changing computers video resolutions 
Depending on your computers graphic capability, you may be able to select one of several 
resolutions.  Generally a computer- either a PC or Macintosh- with 1 MB VRAM will run: 
640 x 480 at 16.7 million colors (24 bit True color) 
800 x 600 at 65,000 colors. 
1024 x 768 at 256 colors. 
As the resolution increases, the number of colors you can run decreases.  With 2 MB VRAM a 
computer will run: 
640 x 480 at 16.7 million colors (24 bit True color). 
800 x 600 at...

Adjusting the volume of the projector speaker 
Press VOLUME + to increase the volume or - to decrease. 
The volume can also be adjusted with the menu operation. 
 
 
Using the laser pointer 
You can highlight the desired point on the screen with the beamed red light. 
 
 
***Caution*** Do not look into the laser pointer while it is on. Do not point the lase\
r beam at 
any other persons.  This could result in serious eye damage or blindness. 
 
 
Press the LASER button. The red laser light will be on...

Menu operation- Selecting the input source with the remote 
1) Press MENU. The button lights 
       in red and the main menu 
      appears on the screen. If you  
      dont proceed to step 2 within ten 
      seconds, the button goes off. 
Note: The menu will not be 
displayed if the picture is enlarged 
even slightly.  In such a case, reduce 
the picture size to normal before 
starting the menu operation. 
 
2) Press the cursor up or down to 
      select  SOURCE MENU. 
 
     3) Press L-CLICK. (the...

Selecting the projection type; Floor, Ceiling, Rear and Front 
This reorients your image for your type of projection. 
1. Press MENU to display the main menu. 
2. Press the cursor up or down key to select SETTING MENU. 
3. Press L-CLICK to display the SETTING MENU. 
4. Press the cursor up or down key to select PROJECTION. 
5. Press the cursor +/- key to select the projection type, which suits the Projector setup 
conditions. 
The following four projection types can be selected: 
a. FRONT FLOOR (Normal)....

Adjusting the image from the source connected to the RGB IN connector 
The Projector selects the most suitable resolutions as shown in the Timing Chart below 
according to the incoming signals from the RGB IN connector.  However, you may need manual 
adjustment depending on the computer or video component connected to the RGB IN connector.  
If you have any of vertical banding, noise, dot interference, or crosstalk on the proje\
cted picture, 
adjust clock frequency with PICTURE ADJ then clock phase with...

Timing Chart 
 Signal Resolution H. Sync. 
(kHz) 
V. Sync. 
(Hz) 
Dot Clock 
(MHz) 
1 NTSC 640 x 480 15.734 59.94 - 
2 PAL 768 x 576 15.625 50 - 
3 SECAM 768 x 576 15.625 50 - 
4 VESA 640 x 350 37.86 85.08 31.5 
5 Mac 640 x 400 35 66 30.24 
6 IBM 640 X 400 31.47 70 25.175 
7 VESA 640 X 400 37.86 85.08 31.5 
8 VESA 640 X 480 31.47 59.94 25.175 
9 IBM 640 X 480 31.47 60 25.175 
10 Mac 640 X 480 31.47 60 25.175 
11 Mac 640 X 480 34.97 66.67 31.334 
12 Mac 640 X 480 35 66.67 30.24 
13 VESA 640 X 480 37.86...

 Adjusting the clock frequency (PICTURE ADJ) and clock phase (FINE 
PICTURE) manually 
When AUTO PICTURE is set to ON, the clock frequency and clock phase will be adjusted 
automatically.  However, if you need any manual adjustment for these two items, you first need 
to set AUTO PICTURE to OFF as indicated in the following steps.  Adjust the clock 
frequency to eliminate any vertical banding, then clock phase to reduce any video noise, dot 
interference, or cross talk.  (When clock phase is not matched...