Vertical
Pre-Amplifier
2212
Service Manual
0
Vertical System
This section describes the vertical preamplifier circuit (diagram 1),
the
delay
line driver circuit (diagram 2), the vertical output amplifier circuit (diagram
3),
the vertical position logic and the vertical switch logic (part of diagram
8).
Diagrams are located
in
section 9 Diagrams. See also the block diagram (Figure
3-2) for
an
overview of the Vertical System.
The
CH
1
and
CH
2 pre-amplifier circuits are identical except for the invert
switch
in
the
CH
2 pre-amplifier circuit. Therefore, the
CH
1 pre-amplifier is
described only. The pre-amplifier circuit can be split
up
in
four main parts:
- Attenuator circuit
- Input buffer circuit
- Pre-amplifier circuit
- Storage pick off amplifiers
The functions of each of these parts of the circuit will
be
described below.
Attenuator Circuit
The attenuator of the 2212 is of a programmable type. The attenuation factor and
coupling mode are set by control lines
CH1
CTR
0
...
3.
3-7
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