Service Manuals, User Guides, Schematic Diagrams or docs for : TOSHIBA TV toshiba_2857db

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TOSHIBA 2857 DB                                                                                                                                                  1
                                     General Information                                                                    Service Mode General                                                                                                                                    Picture

                                           Chassis: C5SS                                                                         Instructions
                                                                                                                         1. ENTERING TO SERVICE MODE

                                                    Matrix                                                               1) Press     button once on Remote Control.
                                                                                                                                                                                                                                                                                    Using method
                                                                                                                                                                                                                                                                                    Picture position (horizontal, vertical and slant) in
Item                                                                                   See Model            Book                                                                                                                                                                    CRT adjustment.
Adjustments (Not Service mode) .................................................................. 2152 DB        5                                                                                                                                                                  Making approx. 1 Vp-p signal in QA01.
                                                                                                                                                                                                                                                                                    Black cross-hatch
  X-RAY RADIATION PRECAUTION                                     2. It is essential that to maintain the safety of the
                                                                                                                                                                                                                                                                                    White cross-hatch
                                                                    customer all cable forms be replaced exactly
  1. The E.H.T. must be checked every time the                      as supplied from factory.                            2) Press     button again to keep pressing.                                                                                                                Picture
     receiver is serviced to ensure that the C.R.T.              3. A small part of the chassis used in this
     does not emit X-ray radiation as result of                     receiver is, when operating, at approximately
     excessive E.H.T. voltage. The nominal E.H.T.                   half mains potential at all times. It is therefore
     for this receiver is 31.5 kV at zero beam                      essential in the interest of safety that when
     current (minimum brightness) operating at                      serving or connecting any test equipment the                                                  
     240V a.c. The maximum E.H.T. voltage                           receiver should be supplied via a suitable
                                                                                                                                                                                                                                                                                    Using method
     permissible in any operating circumstances                     isolating transformer of adequate rating.
                                                                                                                                                                                                                                                                                    Convergence and vertical amplitude adjustment
     must not exceed 32.0 kV. When checking the                  4. Replace blown fuses within the receiver with
                                                                                                                                                                                                                                                                                    Making approx. 1 Vp-p signal in QA01.
     E.H.T., use the `High Voltage Check' proce-                    the fuse specified in the parts list.                3) Keep pressing the        button, press MENU
     dure, using an accurate E.H.T. voltmeter.                   5. When replacing wires or components to                button on TV set.                                                                                                                                          Signals
  2. The only source of X-RAY radiation in this                     terminals or tags, wind the leads around the
                                                                                                                                                                                                                                                                                    Black cross-dot
     receiver is the C.R.T. To prevent X-ray                        terminal before soldering. When replacing
                                                                                                                                                                                                                                                                                    White cross-dot
     radiation, the replacement C.R.T. must be                      safety components identified by the interna-            RCUT           S
     identical to the original fitted as specified in               tional hazard symbols on the circuit diagram            32H                                                                                                                                                     Picture
     the Parts List.                                                and parts list, it must be a Toshiba approved
  3. Some components used in this receiver have                     type and must be mounted as the original.
     safety related characteristics preventing the               6. Keep wires away from high temperature
     C.R.T. from emitting X-ray radiation. For                      components.
     continued safety, replacement component                                                                             (Service mode dIsplay)
     should only be made after referring the                     PRODUCT SAFETY NOTICE
                                                                                                                                                                                                                                                                                    Using method
     Product Safety Notice below.                                                                                        2. SELECTING THE ADJUSTING ITEMS                                                                                                                           Convergence adjustment
                                                                 Many electrical and mechanical components in            Every pressing of CHANNEL v button changes                                                                                                                 Making approx. 1Vp-p signal in QA01.
  SAFETY PRECAUTION                                              this chassis have special safety-related                the adjustment items in the following order.
                                                                 characteristics. These characteristics are often        (w button for reverse order.)                                                                                                                              Signals
  1. This receiver has a nominal working E.H.T.                  passed unnoticed by a visual inspection and the
                                                                                                                                                                                                                                                                                    H signal (Left, right, white)
     voltage of 28.5 kV. Extreme caution should be               X-ray radiation protection afforded by them             3. ADJUSTING THE DATA                                                                                                                                      H signal (Left, right, black)
     exercised when working on the receiver with                 cannot necessarily be obtained by using
     the back removed. Do not attempt to service                 replacements rated at higher voltages or                Pressing of VOLUME v or w button will change                                                                                                               Picture
     this receiver if you are not conversant with the            wattage, etc. Components which have these               the value of data in the range from 00 to FF. The
     precautions and procedures for working on                   special safety characteristics in this manual and       variable range depends on the adjusting item.
     high voltage equipment. When handling or                    its supplements are identified by the interna-
     working on the C.R.T., always discharge the                 tional hazard symbols on the schematic diagram          4. NORMAL OPERATION ON THE SERVICE
     anode to the receiver chassis before remov-                 and parts list. Before replacing any of these           MODE
     ing the anode cap The C.R.T., if broken, will               components read the parts list in this manual
                                                                                                                                                                                                                                                                                    Using method
     violently expel glass fragments. Use shatter                carefully. Substitute replacement components            Press MENU button on TV.                                                                                                                                   For checking (of purity drift) of white uniformity
     proof goggles and take extreme care while                   which do not have the same safety characteris-
                                                                                                                                                                                                                                                                                    of CRT H signal (Left, right, white).
     handling. Do not hold the C.R.T. by the neck                tics as specified in the parts list may create X-       Adjustment mode                       Service mode                                                                                                         Check in light area.
     as this is a very dangerous practice.                       ray radiation.
                                                                                                                                                                                  TEST SIGNAL SELECTION                              Stopping G and B output of Q501                H signal (Left, right, black).
                                                                                                                         RCUT              Address                            S                                                      Green single colour.                           Check in dark area.
                                                                                                                         32H               Data        Press
                                                                                                                                                                                  Every pressing of  button changes the test         Stopping R and B output of Q501                The adjustment will be the best, if the time when
                                                                                                                                                                                  patterns on screen as described below in           Blue single colour.                            unevenness of color in light area occurs, is a
                                Recommended Safety Parts                                                                                                                          SERVICE MODE.                                      Stopping R and G output of Q501                little longer than that in dark area.
                                                                                                                                                                                                                                                                                    Making approx. 1Vp-p signal in QA01.
                                                                                                                                                                                                                                     Black single colour.
 Item          Part No.             Description                                                                                                                                        Signal off  NTSC signals (14 patterns)        Making black signal of approx. 1Vp-p in QA01
                                                                                                                         5. EXIT FROM SERVICE MODE                                                                                   White single colour.


  A401          23426393            Back Cover                                                                                                                                                                                       Making white signal of approx. 1Vp-p in QA01
  C440          24082482            PF, 7000pF, 

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