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A diagnostic tool for typewriters plugs into the connectors for the typewriter logic circuit boards and is powered in part from the power supply for the magnet drivers of the typewriter.
English (United States)
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Diagnostic Tool for Typewriters
A diagnostic tool for typewriters plugs into the connectors for the typewriter
logic circuit boards and is powered in part from the power supply for the magnet
drivers of the typewriter.
The tool sends out commands that exercise the various systems of the
typewriter, such as the escapement system and the selection system.
Waveforms produced in energizing escapement and selection magnets are
examined to identify out of specification characteristics. During certain printer
operations, emitter pulses from the escapement system are analyzed to detect
separation intervals that are abnormal and indicate problems, such as binds, in
the escapement system. These intervals are evaluated by counting clock pulses
between emitter pulse events and comparing the count totals with expected
Other useful tests involve system exercises, such as repeated carrier shifts,
that cause vibration and are used to detect proble such as intermittent reed
switch failures, which tend to be more in evidence at high vibration levels.
The logic to control the test operations is provided by a programmed
microprocessor, and the keyboard is used for test repertoire selection.
Messages to the operator regarding test results are provided using the normal
With this plug-in type of tool, detailed testing of signals and signal timing is
possible at a low cost.