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Sim2 Multimedia Domino D80e Projector User Manual

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    							11
    5   SwiTChiNg ThE PROJECTOR ON AND Off
    wARNiNg: Connect the projector to a power supply with a 
    nominal voltage within the following values: 110-240 V AC, 
    50/60 hz. it must be earthed (f ig. 12).
    Position I : on
    Position O : off
    Power switch
    Fused power 
    socket  Power plug
     
    Fig. 12
    In position  i the projector will initialise itself  (red and green leds 
    on) and then goes into standby mode (red led on) (Fig. 13).
    HDMI AUDIO
    OUT
    ZOOM
    CONTROL (RS 232) GRAPHICS RGB
    R/Cr
    G/Y
    B/Cb
    HV
    2
    435
    ATTENTION: pour ne pas compromettre 
    la protection contre les resque dincende 
    remplacer par un fusible de meme type 
    et de mems caracteristique
    CAUTION: for continued protection against 
    risk of fire, replace 
    only with same type 
    and rating fuse.
     
    SwiTCh ON fROM STANDBY 
    With the remote control press one of the keys (Fig. 14):
    - 0 to select the last imput selectet after last switching off.
    - 1-9 to select the correspondent imput.
    With the keypad: press the ON/OFF button.
    ZOOM
    CONTROL (RS 232)GRAPHICS RGB12
    4
     
    When the unit is switched on from standby the lamp switches 
    on;  after  a  brief  period  of  warming  up,  the  image  displays 
    (green led on).
    If a ver y short time has passed since the unit was last switched 
    off, the lamp may not switch on beause it is too hot.
    Just wait a few minutes for the lamp to cool down sufficiently.
    Note: 
    At  power  ON  the  picture  could  be  displayed  with  a  wrong 
    orientation; this is not a fault.
    Fig. 13 Fig. 14  
    						
    							12
    SwiTChiNg Off AND RETURNiNg TO STANDBY
    With the remote control: press  
    .
    With the keypad: press 
    .
    When switching off, the projector goes into stand-by mode and 
    stores the input selection at the time of switch-off.
    The  fans  keep  running  until  the  lamp  cools  down  (green  and  red leds on), after which they automatically switch off. Do not 
    switch off the projector with the power switch until the fans have 
    stopped running.  
    6  CONNECTiONS
    To obtain the best performance from your projector, we recom-
    mend  the  use  of  good  quality  “ video  cables”  to  the  various 
    signal sources (75 ohm Impedance).
    Poor quality cables will cause inferior picture performance.
    For  optimum  connectivity  we  recommend  you  follow  these 
    simple steps:
    -  
    With  exception  of  coaxial  RCA/Phono  type  connectors, 
    always  double-check  that  the  plug  is  inserted  the  correct 
    way round to avoid damaging the plugs or the sockets on 
    the projector (Fig. 15).
    -    Remove cables by the plug and do not pull on the cable 
    itself.
    -    Avoid tangled cables.
      -  
    Position the cables carefully to avoid a trip hazard - espe-
    cially in low light areas.
    Fig. 15
    Initialisation
    StatusLed greenLed rosso
    Standby
    On
    Cooling
    : Of : On
    : Flashing
    Damage sensors
    temperature
    Table 1
    HDMIA
    UDIO
    OUTZOOM
    CONTROL (RS 232) GRAPHICS RGB
    R/Cr
    G/Y
    B/Cb
    HV
    12
    435
    ATTENTION:  pour ne pas compromettre 
    la protection contre les resque d incende 
    remplacer par un fusib le de meme type 
    et de mems car acteristique
    CAUTION:  for contin ued protection against 
    r isk of fire , replace 
    only with same type 
    and r ating fuse .
    75 
            
    						
    							13
    D80E - Connection panel 
    31245
    Television receiver
    DVD player
    VCR
    Videocamera
    Video game consoleTelevision receiver
    HDTV receiver
    DVD player
    VCR
    Video game consoleComputerDVD player
    HDTV receiver
    Fig.16
    6
           
     
          
         
           
                                                      
         8
        
         (
       
     
    ATTENTION: pour ne pas 
    compromettre la protection contr e les 
    resque dincende remplacer par un 
    fusible de meme type et de mems 
    CAUTION: for continued protection  against 
    risk of fire, replace 
    only with same type 
       
       
    GRAPHIC RGB
    CONTROL RS 232
    HDMI
    1
    2
    3
    4
    5  
    						
    							14
    of the pictures reproduced by the D80 in the two cases:  the 
    deinterlacing  performed  by  the  D80E  is  often  more  effective 
    than that performed by the source itself.
    gRAPhiCS RgB
    This input should be connected to an RGB-type video or graphic 
    signal using a cable with a DB15HD type connector.
    The signal source device (typically a personal computer or game 
    console) must be able to provide separate H/V synchronisation or 
    composite H+V synchronisation.
    hDMi™
    HDMI™  (High  Definition  Multimedia  Interface)  integrates  an 
    uncompressed high definition video signal with a multichannel 
    audio signal and allows exchange of control data between the 
    video source and the  D80E.
    The HDMI input allows connection to video sources that use the 
    HDCP (High-Bandwidth Digital Content Protection) protocol to 
    protect their contents. 
    Once the video source has been connected to the HDMI input, 
    internal processing by the  D80E separates the video information 
    from  the  audio  information.  The  audio  information  is  made 
    available on a digital output with a female TOSLINK connector 
    in compliance with the  S/PDIF standard.
    You  can  use  a  DVI-D  >  HDMI  adapter  cable  to  connect  the 
    DVI-D signal from a source equipped with a DVI-D output.COMPOSiTE ViDEO 
    Fit  an  RCA  connector  with  a  Composite  Video  (CVBS)  signal 
    to this input.
    The  output  connector  on  the  external  appliance  is  normally 
    coloured yellow and will often be labelled VIDEO.
    Other signal and socket formats may be preferable (because 
    they give better image quality), but this type of output socket is 
    still the most commonly used, and nearly all television receivers, 
    video recorders, DVD players and camcorders, etc. use it.
    S-ViDEO 
    Fit a mini-DIN connector with an S-Video signal to this input. 
    The  corresponding  output  at  the  external  device  is  normally 
    identifiable by the labels S-VIDEO or Y/C.
    This  type  is  nearly  as  common  as  Composite  Video,  and  is 
    preferable to the latter, since it gives higher image quality.
    RgB/YP
    rPb 
    These inputs use a set of 4 RCA connectors.
    RGB and Component signals can be applied to each set of 
    connectors.
    RGB signals can have composite synchronisation on the green 
    signal (RGsB), or on the HV signal.
    Connect the R, G, B outputs of the source to the respective R, 
    G, B inputs of the D80E (taking care not to invert the positions) 
    and any synchronisation signals to the HV.
    When  hooking  up,  use  the  colours  of  the  RCA  connectors  as 
    an aid as follows: the R connector is red, G is green, B is blue 
    and HV is white. 
    You  can  use  a  SCART  to  RCA  adapter  cable  to  connect  the 
    RGB  signal  from  a  source  equipped  with  a  SCART  output  to 
    this input.
    The  Component  signals  connect  to  the  Y,  Pr  and  Pb  inputs: 
    take  care  that  the  inputs  correspond  to  the  outputs  on  the 
    source device.
    Since  these  can  be  labelled  differently,  refer  to  Table  1  to 
    establish the correspondence between the various signals. As 
    indicated in the table, the colours of the connectors can also 
    be of help.
    Only horizontal scanning frequencies of 15 kHz (standard video 
    resolution)  or  32  kHz  (high  definition  video,  with  progressive 
    scanning) can be applied to this input.
    Progressive signals usually provide better quality than interlaced 
    signals, but if the source features both progressive and deinter -
    laced signal outputs it is good practice to compare the quality 
    1
    2
    3
    4
    5 
    						
    							15
    RS232 iNTERfACE CONNECTOR 
    The projector can be controlled from a PC: simply hookup 
    the interface connector to a PC ’s RS232 serial cable.
    Do  not  place  objects  between  the  remote  control  and  the 
    receiver on the projector, as this can prevent the remote from 
    working.MOTORiSED SCREEN OUTPUTS
    12Volt
    120 mA 
    The  projector  is  equipped  with  two  outputs  (Voltage:  12  Vdc) 
    for motorised projection screen and screen masking systems, 
    used for masking off the projection area to match the projected 
    image aspect ratio (Fig. 17).
    The  +12V  output  is  activated  when  the  projector  is  switched 
    on  (green  LED  on)  and  is  de-activated  when  the  projector  is 
    in standby mode (red LED on). The output can be set with the 
    “Screen control” adjustment in the “Aspect ” menu. This output 
    allows reduction in the area of a 16:9 screen, into a 4:3 format, 
    by activating a horizontal screen masking system.  Fig. 17
    Fig. 18
    +-
    +
    -
    +
    -
    +
    -
    8   REMOTE CONTROL
    The remote control requires four 1.5 V batteries, size AAA.
    Insert the batteries, taking care to match the polarity, as indi-
    cated  in  the  batter y  compartment  in  the  handset  (Fig.  23). 
    Change  the  batteries  in  the  remote  control  if  experiencing 
    difficulty in sending commands to the projector.
    Remove batteries from the remote control if it is not to be used 
    for a long period of time. The batteries are prone to leak and 
    corrode the remote control’s circuits.
    The  remote  control  sends  commands  to  the  projector  via 
    infrared signals.
    The  projector  is  equipped  with  an  infrared  sensor  on  its  front 
    panel and can therefore be controlled by pointing the remote 
    control towards the projection screen; the IR beam reflects off 
    the screen towards the projector (Fig. 19).
    There is another infrared sensor in the rear of projector.
    4 batteries 
    1.5 V
    AAA size
    Fig. 19
    HDMI
    A
    UDIO
    OUT
    ZOOM
    CONTROL (RS 232) GRAPHICS RGB
    R/Cr
    G/Y
    B/Cb
    HV
    12
    435
    ATTENTION:  pour ne pas compromettre 
    la protection contre les resque dincende  
    remplacer par un fusib le de meme type 
    et de mems car acteristique
    CAUTION:  for contin ued protection against 
    r isk of fire , replace 
    only with same type 
    and r ating fuse .
    CONTROL RS 232  
    						
    							16
    MAiN MENU
    To  access  the  main  menu  of  the  On  Screen  Display  press 
    the 
    MENU key on the keypad or the MENU+ or MENU- key on the 
    remote control. 
    The  main  menu  is  divided  into  four  windows, 
    PICTURE,  IMAGE, 
    SETUP  and  MENU,  in  which  the  various  adjustments  are  grouped 
    according to the frequency of use. Use the  ▲ and ▼ keys to 
    select  the  line  corresponding  to  the  adjustment  you  wish  to 
    make (Fig. 21). 
    The  various  menus  only  offer  the  relevant  adjustments  in  ac-
    cordance with the type of input signal displayed (e.g. certain 
    typical adjustments for video signals, not necessar y for graphic 
    signals, do not appear on the menus, and vice versa). 
    Some adjustments (e.g. 
    BRIGHTNESS and CONTRAST) are associated 
    with a numerical value that can be varied within the set limits 
    using the  ◀ and ▶ keys. 
    For others (e.g. 
    VIDEO TYPE) you can choose between two options 
    presented on the same line and selectable using the keys  ◀ 
    and ▶ Fig.22a/b
    .
     
     
    Picture
    Contrast 
    Colour 
    Tint 
    Sharpness 
    Filter 
    Cinema Mode  50 
    50 
    50 
    3 
    2 
    Off Auto 
    AutoNoise Reduction
    Brightness  60 
    iNPUTS
    The input selection menu is called by pressing 0 on the remote 
    control or with the keypad SOURCE key. To select an input, scroll 
    through  the  list  with  the 
    ▲  e ▼  keys  until  the  required  input  is 
    highlighted, then press  ▶.
    Display of the input selection menu is terminated by pressing 
    the 
    ESC  key  or  when  the  On-Screen  Menu  display  timeout  in-
    terval (set in the Menu Setup) has elapsed orr after the signal's 
    recognising.
    The inputs can receive RGB and YCrCb signals, at 15 kHz, 32 
    kHz or higher. The input and type of signal (RGB or YPrPB) are set 
    in the pull down menu at the right of the symbol < a seguito 
    della pressione del tasto  ◀ (Fig. 20). 
    HDMI 1 input can receive the signals from DVI-D sources. 
    During the short time it takes to find the signal, a box appears 
    showing  the  signal  requested.  As  soon  as  the  signal  is  shown 
    in the box additional information is displayed concerning the 
    video  standard  (for  video  signals)  or  resolution  (for  graphic 
    signals), format and the eventual user's memorie.
    This  informations  can  be  recolled    by  pressing  numerical  key 
    that it corresponds at the selected source.
    In the 
    SETUP  menu you can select whether to display this infor -
    mation or not; for further information  see 
    SOURCE INFORMATION  in 
    the 
    MENU  section of chapter ADDITIONAL INFORMATION.
    2  S-VIDEO 
    4  GRAPHICS RGB 3  COMPONENT / RGBS  1  VIDEO  
    1
    234
    S-VIDEO 3  
    GRAPH RGB 9 COMP RGB 5 VIDEO 1  
    5 5HDMI HDMI 5
    Imputs
    ACTIVE 
    NAMEYe s
    No
    Fig.20
    9  ON SCREEN MENU
    All  system  functions  can  be  operated  from  the  keypad  or 
    remote  control,  with  the  aid  of  a  complete,  user-friendly  on 
    screen menu. 
    Fig.21
    Colour Temperature
    Gamma Correction
    Position
    Y/C Delay 1
    Overscan1
    Aspect
    )MAGE
    Fig.22a  
    						
    							17
    To  access  these  submenus,  press  the  
    						
    							18
    Selecting  the  NO  option  causes  the  de-interlacer  to  apply  a 
    Motion compensated algorithm optimized for video camera 
    signals.
    NOiSE REDUCTiON 
    This adjustment serves to select the noise reduction filter value.
    In this latter case, simply click on the slider and set the value 
    with the ◀ and ▶ keys on the remote control. 
    iMAgE
    This  menu  features  adjustments  relating  to  picture  position, 
    aspect ratio, magnification etc.
    A SPECT
    This  adjustment  allows  you  to  change  the  dimensions  and 
    aspect  ratio  (relationship  between  width  and  height)  of  the 
    displayed image. There are five preset aspects available and 
    three personalised aspects (with user-settable parameters). You 
    can  select  a  different  aspect  for  each  source:  the  selected 
    aspect  ratio  will  be  automatically  applied  the  next  time  the 
    relative source is called.
    You  can  also  select  the  required  aspect  ratio  by  repeatedly 
    pressing the  key 
    , or by pressing  and a numerical key 
    (1...8).The following aspects are available:
    NORMAL :  projects  the  image  occupying  the  full  height  of  the 
    screen  while  maintaining  the  aspect  ratio  of  the  input  signal. 
    Brightness 
    Contrast 
    V  ideo 
    S-V  ideo 
    RGBS  YCrCb  
    RGB Grafico  HDMI™RGBS 15kHz 
    YCrCb 15kHz Adjustments Inputs
    Colour  - - 
    - 
    - -
    - 
    - 
    -  - 
    - 
    - 
    - 
    - - 
    - 
    - 
    - 
    T  int 
    Sharpness 
    Sharpness Mode 
    Filter 
    Present only if the V ideo Standard is NTSC
    Cinema Mode 
    V 
    ideo T  ype 
    Noise reduction 
    - 
    - 
    - 
    -  - 
    - 
    -  - - 
    When the input signal aspect ratio is 4:3 black vertical bands 
    are displayed on the right and left of the picture.
    ANAMORPHIC : correctly displays a 16:9 image.
    LETTERBOx: serves to display a 4:3 letterbox image (with source 
    signal having black bands above and below the picture) so that 
    it fills the 16:9 screen and maintains the correct aspect ratio. 
    P ANORAMIC : widens the 4:3 image and cuts off a strip from the 
    top and bottom. Panoramic is ideal for displaying a 4:3 image 
    on the 16:9 screen of the Display.
    SUBTITLES : raises the image, thus making space for subtitles.
    PIxEL  TO PI xEL: runs a pixel to pixel mapping of any image, without 
    adapting to the screen. The image is projected in the centre 
    of  the  screen  and  if  its  horizontal  and/or  vertical  dimensions 
    are  smaller  than  the  display,  it  is  bounded  by  vertical  and/or 
    horizontal black bands.
    USER 1, 2, 3: use this option if none of the others are satisfactor y. 
    The User formulas give you the ability to continuously adjust the 
    picture size horizontally and vertically.
    w ith progressive  hDMi signals, at any level of resolution, you 
    can only adjust “personalised” settings downward: incremen-
    tal adjustment has been intentionally inhibited.
    NOTE:  The  available  regulations  may  var y  and/or  have  some 
    limitations in operation range relatively to each selected input.
    For each chosen aspect,  the SCREEN CONTROL command
    allows you to reframe the screen to a variety of aspect ratios
    and screen sizes by using an appropriate screen-masking in-
    terface connected to the 12 V output socket (please refer to 
    the screen manufacture manual).  
    COLOUR TEMPERATURE 
    Changes the colour balance of the image. 
    You can define the primar y colour (red, green, blue) positioning 
    by using 5 default settings.  These settings are:
    The default settings are:
    NATIVE (the machine’s native primar y colours) 
    HDTV, EBU, SMPTE-C, primar y colours defined by the standards 
    AUTO, mode that applies one of the standard settings descri-
    bed above.
     For each of the settings listed in column “1 RgB” there are 9 
    default white balance adjustments.
    The default settings are:
    STANDARD applies a certain white balance depending on the 
    standard selected in column “ 1 RgB”; 
    HIGH - MEDIUM - LOW (default white balance levels);  
    						
    							19
    gAMMA CORRECTiONDetermines the system’s response to the grey scale, empha-
    sising or attenuating the different grades of brightness (blacks, 
    dark, medium, light grey, whites) in the projected image. 
    The projector has a range of gamma functions which enable 
    you  to  display  any  image  to  the  best  effect  for  the  type  of 
    video  source,  the  ambient  lighting  and  your  subjective  pre-
    ferences.
    There  are  4  sets  of  gamma  curves:  Standard  (ST),  Enhanced 
     ST1  For general use
      ST2
      ST3
      ST4
      ST5
     
      EN1  Suited  to  displaying  images  from  videoca -
    meras,  digital  cameras  or  TV  studios  in  high 
    ambient light.
     
      EN2  Suited  to  displaying  images  from  videoca -
    meras,  digital  cameras  or  TV  studios  in  low 
    ambient light.
      EN3  Suited to displaying cinematographic material 
    in high ambient.
      EN4  Suited to displaying cinematographic material 
    in moderate ambient.
     
      EN5  Suited to displaying cinematographic material 
    in controlled ambient light.
      G1  Suited to displaying graphic images (e.g. Win -
    dows desktop) in moderate ambient light. 
     
      G2  Suited to displaying graphic images in mode-
    rate controlled light.
    Table 5 - gamma correction settings
    gamma functions
    Standard
    gamma functions
    Enhanced SiM2
    gamma 
    functions 
    graphics
    NATIVE (the machine’s native white balance);
    D75 - D65 - D50 - C  standard CIE illuminants;
    If the default white balance settings are not sufficient, you can 
    adjust the white balance manually.
    Colour temperature can be adjusted by positioning the white 
    point within the CIE chromaticity diagram. The system permits 
    you to place the white point inside a grid positioned in the neu -
    tral colour zone. Moving along the“horizontal”lines changes the 
    related colour temperature, with low temperatures on the right 
    (thus increasing the red content) and high temperatures on the 
    left of the graph (thus increasing the blue content). Points along 
    the  yellow  horizontal  line  represent  the  colours  on  the  black 
    body curve. The colour temperature along the“ vertical”lines is 
    constant but differs to a lesser or higher degree from the black 
    body curve. This means that by selecting the points on the hi-
    gher part of the graph you will increase the blue component. 
    On  the  contrar y,  by  selecting  points  in  the  lower  part  of  the 
    graph, the purple component increases.
    BEST COLOR
    The projector uses the BrilliantColor(TM) algorithm to improve the 
    colour rendering of images. By enabling this function, the quality 
    of the image is optimised to the detriment of a moderate loss of 
    light. With this function disabled, the BrilliantColor(TM) algorithm 
    makes use of the maximum projector light .Fig. 23
    Fig. 24
    Native
    HDTV
    EBU
    SMPTEC-C
    AUTO
    User 1
    User 2
    Standard
    High
    x = 0,113
    y = 0,033
      T = 5500K
    Medium
    Low
    Native
    D75
    D65
    D50
    C
    User
    = 0.009uv
    x
    y
    Image
    1R G B2White3Color Information
    = 0.009uv
    Native
    HDTV
    EBU
    SMPTEC-C
    AUTO
    User 1
    User 2 Standard
    High
    T= 7500 K
    White:
    x = 0,296
    y = 0,325
    Red: x = 0,653
    y = 0,293
    Green: x = 0,323
    y = 0,653
    Blue: x = 0,113
    y = 0,033
    = 0.009
    Medium
    Low
    Native
    D70
    D65
    D55
    C
    User
    Image
    1R G B2White3Color Information
    uv  
    						
    							20
    SIM2 (EN) and Graphics (GR), User. The Standard curve has been 
    defined  for  general  use,  and  is  set  for  videocameras,  digital 
    cameras, and for viewing films or photos on your PC. The Enhan-
    ced set is suitable for watching movies. The Graphics set is suited 
    to  displaying  synthetic  graphics  (PC,  CAD,  PC  presentations, 
    etc.). User enables you to define your own curve. You can thus 
    select the coefficient which determines the curve.  Values from 
    1.5 to 2.2 allow you to emphasise the detail of dark images, 
    but  reduce  overall  contrast.  Values  higher  than  2.2  increase 
    overall  contrast,  but  reduce  the  detail  of  dark  areas.  For  the 
    most common video sources, the  overscanning value can be 
    in the range (no overscanning) to 32 (maximum). The resulting 
    image  always  maintains  the  selected  aspect  irrespective  of 
    the selected overscan value. 
    POSiTiONUse this adjustment to position the image vertically and horizon -
    tally. Determines the aspect ratio of the projected image.
    These parameters do not normally require adjustment because 
    the system checks the input signal and automatically sets the 
    most  suitable  values.  However,  if  the  image  is  not  perfectly 
    centralised it may prove useful to request the system to repeat 
    the input signal analysis and image positioning, calling the au-
    tomatic control procedure with button 
    A  on the remote control 
    or the AUTObutton on the keypad. When this procedure is called 
    it is helpful to have a while or light  coloured background on the 
    screen in the current picture.  
    Frequency/phaseThese adjustments, available for progressive signals and for si-
    gnals from a PC, ensure correspondence between the number 
    of  pixels  making  up  the  signal  and  the  number  of  pixels  that 
    make up the projected image.
    These parameters do not normally require adjustment because 
    the system checks the input signal and automatically sets the 
    most suitable values. If however the image is disturbed (loss of 
    resolution between equidistant vertical bands or instability and 
    lack of detail in thin vertical lines) it may help to ask the system 
    to rerun the input signal analysis and set the best parameters 
    by calling up the automatic adjustment function with 
    A on the 
    remote control or 
    AUTO on the keypad.
    If  the  automatic  procedure  fails  to  have  the  required  effect, 
    enter  the  frequency  and  phase  values  manually  and  ap-
    proach  the  screen  sufficiently  to  observe  the  effects  of  the 
    adjustments.
    OVERSCAN
    Eliminates irregularities around the outer borders of the image.
    Some less accurate sources may produce an image with un-
    even borders; thanks to the overscan function these imperfec-
    tions can be moved to outside the displayed area. Il
    parameter to 2.2, typically yields pleasant, contrasty images. 
    Y/C DELAY
    In the case of Video and S-Video signals, it may be necessar y 
    to correct horizontal colour misalignment within the projected 
    image. For a given video standard (e.g. PAL or NTSC) the stored 
    value does not normally require further fine-tuning, unless the 
    source or connection cable has changed.
    SETUP
    The setup menu contains less frequently used adjustments that 
    may  be  required  during  installation  (e.g.  On  Screen  Display 
    language selection or the display of Test Patterns).
    ORiENTATiON
    Reverse  the  image  vertically  and  horizontally  to  best  fit  the 
    installation:  i.e.  desktop  front,  ceiling  front,  desktop  rear  and 
    ceiling rear (Fig.25).
    VERTiCAL KEYSTONE
    To  get  the  best  image  quality,  we  recommend  installing  the 
    image  on  a  surface  which  is  perpendicular  to  the  screen.  If 
    the  projected  image  is  not  level,  adjust  the  feet  on  its  base 
    to obtain a level position, lining up the base of the projected 
    image to the base of the projection screen (Fig.26). 
    If  this  adjustment  is  insufficient  to  centre  the  image,  tilt  the 
    projector and use the Vertical/horizontal keystone adjustment 
    to compensate for the resulting distortion. Fig.25 
    						
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