Philips EM3E, Руководство по обслуживанию, Страница: 38 / 120

Electrical Alignments GB 90 EM3E 8.
crosshatch) for a correct geometry alignment. Use the
'Internal Test Pattern' only for the 'Vertical slope' alignment.
V. slope
This alignment is meant to align the zero crossing of the
frame deflection to the mechanical middle of the picture tube.
1.
Set 'Test Pattern’ to ‘On' (read warning above).
2. Set the 'V. S-correction' value to ‘0’ all sets (the
boundary-stripes of the test pattern should be positioned
on the edge of the picture tube).
3. Align ‘V. slope’ (when aligning, the lower half of the
picture is blanked) such, that the middle line of the test
pattern is matched with the edge of the pattern transient
in the middle of the picture.
4. Push the 'MENU' button to return to the previous menu.
Vertical alignment
1. Use 'V. amplitude' to align the vertical amplitude so that
the entire test pattern is visible.
2. Set 'V. shift' to value ‘32’.
3. Connect a voltmeter (V
DC
) between R3624 and ‘hot’
ground.
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 a
not pre-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’s are
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.
8.4 Option Settings
8.4.1 Introduction
The microprocessor communicates with a large number of
I
2
C ICs in the set. To ensure good communication and to
make digital diagnosis possible, the microprocessor has to
know which ICs to address. The presence / absence of these
specific ICs (or functions) is made known via the option
codes.
You can set the ‘hardware related’ options via the SAM -
‘Alignments’ - ‘Options’ or ‘Option Numbers’ menu.
You can set the ‘software related’ options via the SAM -
‘Dealer Options’ menu .
After you have changed the option(s), save them via the
'Store' command.
The new option setting is only active after the TV is switched
OFF and ON again via the mains switch (the EAROM is then
read out again).
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