Logic Conventions
Overview
of
the
Circuits
2212
Service Manual
Overview
The
content of
the
Theory
of
Operation
may
also be
used
as a troubleshoot-
ing
aid to
help
determine
the
need
for
repair
or readjustment.
This subsection contains a description
of:
Logic
Conventions
Overview of the circuits and their functions on the board assemblies
The 2212 Oscilloscope contains a lot oflogic circuits. This manual refers to
these circuits
with
standard logic symbols and terms. Unless otherwise stated all
logic functions are described using positive -logic convention: the more positive
of the two levels is high (1) state,
and
the more negative level is the low
(0)
state. Signal states may also be described as "true" meaning their active state or
"false" meaning their non-active state. The specific voltages that constitute a
high
or
low state vary among the electronic devices.
Active-low signals are indicated by an underscore and a zero LO) following the
signal name
(RESET
_O).
Signal names are considered to be either active-high,
active-low, or have both active-high and active-low states.
This circuit overview describes the basic functions per board assembly of each
functional circuit.
Main
Board (AlO)
The following circuits are located on the main board:
- Vertical Preamplifier circuit with the vertical signal input, the attenuator
circuit
and
the preamplifier circuit.
Vertical position circuit and the delay line driver circuit.
Vertical output amplifier circuit
Trigger circuit
Sweep logic circuit
Timebase circuit
Horizontal magnifier circuit and readout mux
Horizontal output amplifier circuit
- Mainboard interface circuit
- Mainboard power distribution
- Z-axis
input
amplifier
Non-volatile memory circuit
Revised 3/93
3-1
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