GB 908.EM3EElectrical Alignments
crosshatch) for a correct geometry alignment. Use the8.4Option Settings
'Internal Test Pattern' only for the 'Vertical slope' alignment.
8.4.1 Introduction
V. slope
This alignment is meant to align the zero crossing of the
The microprocessor communicates with a large number of
frame deflection to the mechanical middle of the picture tube.2
IC ICs in the set. To ensure good communication and to
1. Set 'Test Pattern? to ?On' (read warning above).
make digital diagnosis possible, the microprocessor has to
2. Set the 'V. S-correction' value to ?0? all sets (the
know which ICs to address. The presence / absence of these
boundary-stripes of the test pattern should be positioned
specific ICs (or functions) is made known via the option
on the edge of the picture tube).
codes.
3. Align ?V. slope? (when aligning, the lower half of the
picture is blanked) such, that the middle line of the test
You can set the ?hardware related? options via the SAM -
pattern is matched with the edge of the pattern transient
?Alignments? - ?Options? or ?Option Numbers? menu.
in the middle of the picture.
You can set the ?software related? options via the SAM -
4. Push the 'MENU' button to return to the previous menu.
?Dealer Options? menu .
Vertical alignmentAfter you have changed the option(s), save them via the
1. Use 'V. amplitude' to align the vertical amplitude so that'Store' command.
the entire test pattern is visible.
2. Set 'V. shift' to value ?32?.The new option setting is only active after the TV is switched
3. Connect a voltmeter (VDC) between R3624 and ?hot?OFF and ON again via the mains switch (the EAROM is then
ground.read out again).
4. Adjust the DC voltage to ?0? with potmeter R3642.
5. Use 'V. shift' again to align the test pattern vertically in the
middle.
6. Repeat the the alignment if necessary.
Horizontal alignment
1. Use 'H. amplitude' to align the horizontal amplitude so
that the entire test pattern is visible.
2. Use 'H. shift' to align the picture horizontally in the
middle.
3. Repeat the 'H. amplitude' alignment if necessary.
Note: In case the horizontal linearity in wide-screen mode is
out of tolerance, add a ?DC-shift correction? panel (3104 328
06230) to connector 1419 of the DAF-panel [ I ]. Be sure to
switch ?off? the set first.
On the DC-shift panel, cut diode 6433 for correction to the
right or diode 6432 for correction to the left.
Caution: never plug in anotpre-aligned module in a set !!!
East/west alignment
1. Use 'East/West Parabola' to align the vertical lines until
straight.
2. Use 'Upper East/West corner' to align the vertical lines in
the upper corners until straight.
3. Use 'Lower East/West corner' to align the vertical lines in
the lower corners until straight.
4. Use ?East/West Trapezium? to align for a rectangular.
5. Use 'Horizontal Parallelogram? to align for straight
vertical lines if necessary.
6. Use ?Horizontal Bow' to correct the E/W parabola such,
that it becomes symmetrical. Default value is ?31?.
7. Repeat steps 1 to 6 if necessary.
8.3.4 'Super wide geometry' alignments (only for widescreen
sets)
Note: The header of this paragraph and also the menu?sare
somewhat misleading. We only need to set the following
values (if the normal geometry alignment has been
performed correctly):
1. For ?V. shift? use the default value 33.
2. For ?V. amplitude? use the default value 25.
3. ?V. S-Correction?, enter value of 'normal geometry'
alignment.
4. ?H. amplitude?, enter value of 'normal geometry'
alignment subtracted by 1.
5. ?East/west Parabola?, enter value of 'normal geometry'
alignment. |
ACEC
