Trapezium Set the vertical lines of the testGammaGamma correction set to basic value.
pattern parallel to each other.(Basic value 0)
Note: Cyclically repeat the setting points parabola andNote: With this parameter a non-linear transmission
function in video signal processing can be set (Gamma = 0
trapezium until an appropriately correct geometry
impression is achieved. In setting the parameter ParabolaŢ linear transmission function). At maximum non-linearity
(Gamma = 63) an expansion of small video amplitudes
the vertical central area of the image should be optimised
first. If ne-cessary, readjust with Adjust Angle, Bow, Upper(dark image areas) and a compression of large video
amplitudes (light image areas), whereby the maximum
corner and Lower corner E/W-correction.amplitude (peak white) remains constant.
VIDEO b VIDEO SERVICESVMScan Velocity modulation ON/OFF
Switch SVM function (deflecting speed modulation) ON or
Buttons ?p/q?Select parametersOFF if the optional SVM-modul is fitted or is not fitted at the
Buttons ?r/s?Change parametersST.1506 (picture tube board).
?Green? buttonLeave menu (changes are not
YC DelayLuma-Chroma delay
programmed!)
?Yellow? buttonOnly fade Menu IN/OUTRegister Luma-Signal with Chroma-Signal. Separately align
adjustment for the respective colour standard (Pal or
Button ?OK?Leave Menu (changes areSecam) (set test pattern with appropriate standard before
programmed!)
activating Service Mode).
Button ?TV?Leave Service Mode (changes
are only programmed with ?OK?!)LowpassFilter parameter switch over
Switch over adjust to basic value (display is only visible if
Grid 2 setting:First adjust all white levels and16:9 is active). (basic value ?off?)
black levels to the specified basic value (see colour
Save FormIn position ?off? the unit always starts with
adjustment). Then switch to ?ON? in the Video Service
Menu "G2": A grey image (beam current nominal 10?A perZoom format. In position ?on? every format you wish, can
be stored (display is only visible if 16:9 is active).
cathode) is generated, the Menu is then faded out. Then
determine the maximum Cutoff level of the three cathodes
CODEINIT b Reset child lock
with oscillograph (Button divisor 100:1!) and adjust this with
Grid-2-control (bottom control at DST) to +150V (?5V).
Press the yellow button ?CODEINIT? (button) in the main
Focus setting:Set test pattern (colour +service Menu to delete the access code for the child lock
brightness normal, contrast reduced to about 30%). With(also see Operating Instructions "BABY STOP").
Focus control (top control at DST) set to optimum normal
focus. For Bi-focus tubes (16:9/32"-tubes with separateChanging addresses
focus block) adjust the left control (FOC-L) so that
To change an address, go to main service menu and press
horizontal lines are defocused to a minimum over the
complete image width in vertical direction. Adjust the rightthe blue button on the transmitter (the blue switchboard is
control (FOC-H) so that vertical lines are defocused to anot displayed on the screen). After every address change,
press the ?OK? button to store. Leave the service mode
minimum in horizontal direction. The adjustment must be
repeated reciprocally.and then restart the television.
Note: An address change will only be necessary very
Colour alignment:Switch ?Chroma? in the Video
Service Menu to the setting ?Colour OFF?. All white levelsrarely and only if this is advised by the factory.
and black levels are adjusted to the basic value specified.Changing addresses may result in errors.
ChromaColour ON / OFFNew initialisation
Gain RedWhite level Red31 (Basic value)
Gain GreenWhite level Green31 (Basic value)New hardware initialisation:
Gain BlueWhite level Blue31 (Basic value)All program sites are erased and all geometry and video
Reference RedBlack level Red31 (Basic value)parameters with fixed standard values are overwritten,
Reference Green Black level Green31 (Basic value)whereby the former values are irrevocably lost. A complete
Reference Blue Black level Blue31 (Basic value)new alignment of the geometry and video parameters is
therefore necessary! If possible note the data in the table
Then set the shade with the white level for red, green and?Service mode alignment assistance?.
blue according to your eyesight. Adjust the white level of
Switch OFF television with power switch and wait a few
the "weakest" primary colour upwards (>initial value) andseconds. Press and hold the buttons ?PROGRAM - ? and
the white level of the "strongest" colour downwards (<initial
?- ? on the local control panel to start the television.
value). The white level of the colour with the medium
intensity is left at the initial colour.Do not release the two buttons on the local control panel
until the picture appears!
Peak LimitOperational threshold of peak beam
current limit. Set to basic value. (Basic value 40) |
ACEC
HITACHI
