Vertical System
Vertical
Switch
Logic (Part
of
0 )
3-
12
The vertical switch logic consists of:
Shift register U805
Switch logic circuit U810
Chop oscillator circuit U809A , B and C
Vertical and horizontal mode signals are provided
by
the
system processor
via U805, the hold off pulse
and
the chop oscillator clock signal to the input
of the switch logic circuit U810. Output signals are
CH1
enable (CH1EN)
and
CH
2 enable
(CH2EN).
These signals enable the pre-amplifiers
and
determine which vertical position signal is connected
via
muliplexer U811
to the position control circuit.
In vertical alternate mode the hold off pulse acts
as
clock pulse to a divide
by two circuit. In horizontal ALT
MAG
mode and vertical alternate mode
the hold off pulse is connected to a divide
by
four circuit.
Theory
of
Operation
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