Overview; Logic Conventions; Overview Of The Circuits; Main Board (Al0) - Tektronix 2212 Service Manual

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