Beehive International B102 Service Manual page 7

vertical and horizontal synchronization signals
and the video signals generated on the Logic Board
Afj^l screen of information consists of 24 lines of
80 characters. The dot pattern for character
heights varies between B100/B102 and B150/B152.
The B100/B102 has a 9 dot character height with a
two-raster scan between characters and the B150/
B152 has a 10-dot character height with one raster
scan between lines if lower case characters are
used (see Figures 44 and 4-5).
Brightness and contrast adjustments are provided
by external potentiometers located on the rear
panel (see Section II of the Operator Manual).
Other monitor adjustments are discussed in Ap
pendix A.
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Figure 4-4 Character Dot Matrix
of B100/B102
4-4
The monitor displays data on the CRT in a pattern
determined by the vertical and horizontal synchro
nization signals and the video information driving
signals. A +15 DC voltage is applied by the Power
Supply to the monitor.
Vertical Synchronization is applied to the vertical
oscillator and triggers it at the vertical refresh rate
determined by the driving logic. The vertical fre
quency is stablized by the vertical frequency con
trol, which determines the point of oscillation. The
output pulse of the vertical oscillator is applied to
the driver amplifier which shapes the pulse and is
controlled by the vertical linearity control. The
output of the driver amplifier is applied to the
vertical driver by way of the height control. The
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Figure 4-5 Character Dot Matrix
of B150/B152