Alignment instructions
General information:Notes: The vertical geometry must be set before the
horizontal geometry! Please note the following. In 16:9-
When servicing, the set should be connected to andevices four different format presentations can be set (see
isolation transformer (refer to item 2 on page 11).Operating Instructions ?Image Menu"). For geometry
Precautions against static discharge should be taken.alignment set a 4:3 test pattern in ?Decoder Format? and
The HT voltage is in the permissible range if the operatingadjust according to instructions whereby an horizontal
voltage is 145 V with minmum beam current. When a setextension (horizontal ellipse) is created. The correct
has been serviced check that the HT voltage is correct.geometry setting is then automatically defined for the other
The ?basic values? given in the adjustment procedures mayformats.
differ due to circuit amendments, revised specification and
tolerances.16:9-SetAdjust viewing screen format.
V EHT correctionSet value so that the picture
Subject to changes!height fluctuates at a minimum rate with a maximum beam
current change (conversion between light and dark picture
Operating voltage U3:contents) and/or the transient effect is minimised. V EHT
correction is switched off at -128. (Basic value: +20)
Set contrast and brightness to minimum (minimum beam
current!). Check point: Cathode diode D204 againstV shiftAdjust vertical image position.
secondary ground. Set with R106 U3 to +145V (?0.5V).V sizeAdjust vertical image height.
Service mode:LinearityShift the horizontal central line of
the test pattern to half the image
Before activating service mode set test pattern (withheight.
medium brightness and colour and about 30% contrast).
Simultaneously press and then release the ?red? andS correctionAdjust vertical linearity.
?blue? button on the transmitter. Simultaneously pressH EHT correction Set value so that the image width
within five seconds the buttons ?PROGRAM -? and ?with a large change of beam current (e.g. conversion
+? at the local control panel. The main servicebetween light and dark image contents) only fluctuates a
menu is displayed on the screen with an info box and theminimum and/or the transient effect is minimised. H EHT
buttons which can be selected using the appropriate colourcorrection is switched off at -128. (Basic value: +15)
button on the remote control device.AFC EHT correction Set value so that the horizontal
SERVICEimage position with a large change of beam current (e.g.
-----------------------------------------------------------conversion between light and dark image contents) only
Software versionx.xfluctuates a minimum and/or the transient effect is
Eeprom typexxminimised. AFC EHT correction is switched off at 0.
Flagsxx, xx, xx, xx(Basic value: 0)
GEOVIDEOCODEINITAngleE/W-correction for horizontal
rhomboidal distortion. Only change value if parabola and
Press ?TV? to leave Service Mode. Changes are nottrapezium cannot be adjusted satisfactorily.
programmed.(Basic value: 0)
BowE/W-correction for horizontal
GEO b GEOMETRY SERVICEbow-shaped distortion. Only change value if parabola and
trapezium cannot be adjusted satisfactorily.
Buttons ?p/q?Select parameters
Buttons ?r/s?Change parameters(Basic value: 0)
?Red? buttonLeave menu (changes are notUpper cornerE/W-correction of upper image
programmed!)corners. Only change value if parabola and trapezium
?Yellow? buttonOnly fade Menu IN/OUTcannot be adjusted satisfactorily. (Basic
Button ?OK?Leave Menu (changes arevalue: 0)
programmed!)
Lower cornerE/W-correction of lower image
Button ?TV?Leave Service Mode (changescorners. Only change value if parabola and trapezium
are only programmed with ?OK?!)cannot be adjusted satisfactorily. (Basic value:
0).
H shiftAdjust horizontal image position.
H size Adjust image width.
ParabolaCompensate E/W-negative
distortion. |
ACEC
