Service Manuals, User Guides, Schematic Diagrams or docs for : MITSUBISHI Proj TV VZ8_Chassis VZ8_Chassis

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VZ8_Chassis


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                                            Chapter 1
                                           Introduction
                                       VZ8 Chassis Model/Features
         FEATURES              VS-45607     VS-50607     VS-60607    VS-50707    VS-55707    VS-60707   VS-70707
           Chassis                VZ8         VZ8           VZ8         VZ8+       VZ8+        VZ8+        VZ8+
        Screen Size                45"        50"           60"          50"        55"         60"         70"
                     TM
      DiamondShield             Optional    Optional      Optional    Included   Included    Included    Included
     Advanced PIP/POP           PIP/POP     PIP/POP       PIP/POP     PIP/POP    PIP/POP     PIP/POP     PIP/POP
    Digital Convergence             X          X             X            X          X           X           X
  Scan Velocity Modulation                                                X          X           X           X
     Digital Comb Filter         3DYC           3DYC       3DYC        3DYC       3DYC        3DYC        3DYC
           INPUTS
     Rear A/V & S-Video            2             2            2          2           2          2           2
    Front A/V & S-Video            1             1            1          1           1          1           1
Component Inputs (Y,CR&CB)         1             1            1          1           1          1           1
         OUTPUTS
       Video Monitor               1             1            1          1           1          1           1
  Fixed/Variable Audio R/L         1             1            1          1           1          1           1
                                                       Table 1-1


A total of seven Projection TV Models use one of              in Chapter 3, and the convergence circuitry is de-
two versions of the VZ8 Chassis. Three models use             scribed in Chapter 4.
the VZ8 Chassis and four models use the VZ8+ Chas-
sis. Table 1-1 lists the models and some of the main          Luminance/Chrominance separation is acheived
features.                                                     through the 3D-Y/C process, a method that digitally
                                                              processes an entire video frame. This method pro-
The VZ8 Chassis uses some of the latest technolo-             duces results far superior than those that only pro-
gies available, including those listed in Figure 1-1.         cess two or three lines at a time such as Digital Dy-
                                                              namic or 2D-Y/C processing.
  Conve rge nce & Raste r Corre ction
      Digital Circuitry
  Lum inance /Chrom inance Separa tion                        The PIP circuitry features the Picture out of Pic-
      3-D Y/C                                                 ture feature in all VZ8 Models. The PIP circuitry
  PIP                                                         description is in Chapter 7.
      Picture out of Picture
  V-Chip
                                                              The V-Chip circuitry allows advanced program
      Advanced Program Blocking
  Com pone nt Inputs
                                                              blocking by subject matter.
      DVD Component Input Circuitry
  Se lf Dia gnostics                                          Component Video Inputs are featured in all VZ8
      LED Indication of Failure                               models. They are labeled DVD Inputs, and consist
         Figure 1-1: VZ8 Chassis Technologies                 of three video Input jacks, plus Right and Left Au-
                                                              dio Jacks. The video jacks are denoted as Y, Cr and
The VZ8 chassis has Digital Convergence and                   Cb. This method allows the baseband Luminance
Raster Correction circuitry. This not only affects            and Color Difference Signals to be coupled directly
the circuitry, but also the Convergence and Raster            from a DVD player, avoiding any signal degredation
Correction Adjustments. Adjustments are covered               that can be caused by chroma modulation and de-
                                                              modulation.

                                                       Page 1-1
Basically the signals are Y (Luminance), R-Y, and        One sub-menu item under Advanced Features is
B-Y. In the NTSC format the three signals have the       the user's Advanced Convergence Feature. It dis-
following amplitude relationship:                        plays complete Crosshatch pattern allowing the user
     Y = 0.7 Vp-p (plus sync)                            to adjust 64 intersections in the pattern. If the con-
     R-Y = 1.0 Vp-p                                      vergence gets too far off, the user still has the op-
     B-Y = 1.3 Vp-p                                      tion of selecting Reset to Factory Settings, in the
                                                         initial Convergence menu.
The designations Cr and Cb denote that the R-Y
and B-Y are reduced in amplitude, R-Y by a factor        The AV Memory, under Audio Video Settings has
of 0.71, and B-Y by 0.56. This results in the fol-       five AV Memory selections:
lowing signal amplitudes:                                     Standard -- for typical viewing
     Y = 0.7 Vp-p (plus sync = 1.0 Vp-p)                      Daylight -- for daylight viewing
     Cr = 0.7 Vp-p                                            Evening -- for evening viewing
     Cb = 0.7 Vp-p                                            Home Theater
                                                              DVD -- for DVD viewing
The Self Diagnostics provides the servicer with a
method to determine the type of failure that causes      In each category, the video and audio controls are
the set to go into shutdown.                             set for optimum picture. The default control set-
                                                         tings for each of the AV Memory categories are
                  User Menus                             shown in Table 1-3.
Figure 1-2 shows the Main Menu, listing four Sub
Menu Categories. Most of the Menu Items are clear.
Others warrant further explanation.
                                                                        User Adjustments
The V-Chip Parental Lock enables the user to lock        Most user adjustments will be made using the
out specific types of TV programming. Program            VIDEO and AUDIO buttons on the remote con-
rating information is transmitted on the 21st hori-      trol. Pressing the AUDIO button cycles through
zontal line during the vertical blanking interval.       six audio adjustments, or options:
                                                            1) Bass
The V-Chip lock out can be active at all times, set         2) Treble
for a specific time period every day, or turned off         3) Balance
completely. If the program on a selected channel is         4) Surround
locked, the screen goes blue and an on-screen dis-          5) Listen To
play indicates that the program is locked. If the PIP       6) Level Sound
source program is locked, a black insert picture ap-
pears when PIP is activated.                             Pressing the VIDEO button sequences through seven
                                                         video adjustments/options.
   MAIN MENU                                                1) IRIS (On or Off)
    V-Chip Parental Lock                                    2) Contrast
                                                            3) Brightness
    Channel Edit                                            4) Sharpness
    Advanced Features                                       5) Tint
    Audio Video Settings                                    6) Color
                                                            7) Color Temperature (High, Medium or Low)



         Figure 1-2: Main Menu
                                                   Page 1-2
                       AV MEMORY
                                 CATEGORY
ADJUSTMENT     Standard Daylight Evening Home Theater   DVD
     Tint         31      31       31        31          31
     Color        31      31       31        27          31
   Contrast       63      63       63        45          63
  Brightness      31      40       25        31          31
  Sharpness       31      31       31        35          35
 Color Temp.     HIGH    HIGH     HIGH      LOW         LOW
     Bass         31      35       35        31          31
    Treble        31      35       35        31          31
   Balance        31      31       31        31          31
  Surround       OFF     OFF      OFF       OFF         OFF
 Level Sound     OFF     OFF      OFF       OFF         OFF
                         Table 1-3




                          Page 1-3
                Remote Control
The Remote Control for VZ8 models is illustrated
in Figure 1-3. Its functions are straightforward.

The numerical buttons 0 through 9, are used to
enter numerical values for Time Setting, Alarm set-
ting, V-Chip Lock Code, etc. The buttons are also
used to directly access a channel.

The numerical buttons channel change is a three digit
system. Channels with less than three digits may be
accessed in one of three ways.
   1) Add zeros prior to entering the channel
      number, making it a three digit entry. Press
      002 for channel 2.                                                     PIP/POP PIP INPUT PIP CH


   2) Enter the channel number then press EN-                                PIP SIZE   EXCH

      TER.
   3) Enter just the channel number. There will
      be a four second delay before the channel
      change occurs.

When the QV (Quick View) button is pressed, the
TV changes to the previous channel selection. If
pressed again it returns to the original channel. Re-
peated pressing will toggle the TV back and forth
between the two channels.                                             Figure 1-3: Remote Control

When viewing a normal TV picture with no Menu                 1) Side by Side the main and sub pictures
displayed, pressing Info activates the Detail Status             are displayed side by side. Both pictures are
Display. This display includes:                                  compressed horizontally to fit on the 4:3
     Channel Number                                              aspect screen.
     Channel Name (if any)                                    2) Three Picture Channel Scan the set
     SAP, STEREO, CC, and SQV                                    scans through channels, displaying the
     V-Chip rating (if any)                                      content of three channels at a time in small
     Time display                                                insert pictures. The insert for the current
                                                                 channel in the scanning process is live, the
                                                                 other two inserts are still pictures.
                                                              3) Single Insert Picture 



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