Vertical Height; Vertical Centering - Digital Equipment VAXstation I Service Manual

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MAINTENANCE
3.S.3.S
Horizontal Centerinq ·
1.
Run the VCBOl diagnostic and select
the
ALIGN
section
(see
subsection
3.3.1.l
or
Horizontal
Frequency
adjustment, above).
2.
Measure and record the distance between the center
left
edge of the test pattern and the monitor bezel.
3.
Measure and record the distance between the center right
edge of the test pattern and the monitor bezel.
4.
Compare the measurements of
steps
2
and
3.
If
the
difference
between the two measurements is greater than
5 mm,
adjust the HORIZONTAL CENTERING control until
the
difference is less than 5 mm.
3.S.3.6
vertical Height -
1.
Run the VCBOl diagnostic and select
the
ALIGN
section
(see
subsection
3.3.1.1
or
Horizontal
Frequency
adjustment, above).
2.
Adjust the VERTICAL SIZE control until the image· is
set
to a height of:
283.5
+/-
3
mm (11.16 in).
3.5.3.7
Vertical Centering -
1.
Run the VCBOl diagnostic and select
the
ALIGN
section
(see
subsection
3.3.1.l
or
Horizontal
Frequency
adjustment, above).
2.
Measure and record the distance between the
center
top
edge of the test pattern and the monitor bezel.
3.
Measure and
record
the
distance
between
the
center
bottom edge of the test pattern and the monitor bezel.
4.
Compare the two measurements of steps 2 and 3.
If
the
difference
between the two measurements is greater than
5
mm, adjust the VERTICAL CENTERING
control
until
the
difference is less than
5
mm.
3.5.3.8
Horizontal
And
Vertical Linearity -
1.
Run the VCBOl diagnostic and select
the
ALIGN
section
(see
subsection
3.3.l.l
or
Horizontal
Frequency
adjustment, above).
2.
Check that all vertical lines in the
test
pattern
are
equidistant across the screen.
3.
If not, adjust the
VERTICAL
LINEARITY
control
(R318}
until the vertical lines are equidistant.
3-26

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