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WIDTH
—|^aie4 J
ICRISt H
CIMt M
MAIN CHASSIS BOARD
FOCUS
—i Rte<
I—
-1 CI..04 Myi
^
VERTICAL
VERTICAL HEIGHT
FREQUENCY
M
e»ioi
VERTICAL
LINEARITY
KEYWAY FOR CONNECTOR
POLARIZATION
MONITOR ADJUSTMENTS FIGURE 5.2
5.4
MONITOR ADJUSTMENTS
The following adjustments should be made while
the monitor is in the B100 terminal.
The adjustments that follow should be done with
the terminal case removed. A drawing of the
Monitor PC Board adjustment points is shown
in Figure 5-2, while other monitor adjustments
are made from the back panel of the terminal.
Brightness
Contrast
Vertical Adjustments
Focus
Centering
IWARNING-I The Monitor employs high voltages.
Care should be used in making any adjustments
as power will be applied to the Monitor.
The brightness & contrast controls (located on the
back panel) should be positioned to a point where
the white raster on the CRT is extinguished. Fill
5-17
the screen of the CRT with characters from the
keyboard and adjust the contrast control for the
sharpest display of the characters in the upper
left hand side of the screen.
The vertical frequency control (R 116, Figure
5-5) is set to the approximate mechanical mid-
ppint initially. This adjustment will correct for a
rolling display and should be adjusted to correct
that symptom alone. No discrete measurement
is necessary, except for a visual observation as to
the steadiness of the display.
Fill the screen again with characters. The vertical
height control (R 124, Figure 5-2) should be ad
justed eVi inches from the top of the characters
on the first row to the bottom of the characters
on the last row in the center of the display.
The vertical linearity control (R 121, Figure 5-2)
should be adjusted so the characters on the first
row are equally as tall as the characters on the
last row. Their height should be approximately
0.18 inches (46 mm).
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