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The following diagnostic tests are available:
•
Shift Recycle
A "sliding" alphanumeric pattern used to identify missing or malformed
characters, improper vertical alignment, or vertical compression.
•
All E's
A pattern of all uppercase letter E's used to identify missing characters,
misplaced dots, smeared characters, improper phasing, or light/dark
character variations.
•
E plus TOF
A pattern of all E's repeated for ten lines and followed by a form feed to
the next page top of form, used to identify paper motion or feeding
problems, such as paper path obstruction or improper forms.
•
All H's
A pattern of all uppercase letter H's used to detect missing characters or
dots, smeared characters, or improper phasing.
•
Underline Only
An underline pattern useful for identifying hammer bank misalignment.
•
Black Plot
All dot positions are printed, creating a solid black band. This test
exercises the shuttle and the hammer bank at their maximum capacity.
This test can also be used to identify misaligned hammers, which show
up as vertical white streaks or lines.
•
Shut/Ribbon Fast
Verifies proper operation by exercising shuttle and ribbon motion at fast
speed. This test can also be used to check that the ribbon tracks correctly
through the ribbon path. In addition, the test can be used to check that the
ribbon reverses direction properly.
•
Shut/Ribbon Slow
Verifies proper operation by exercising shuttle and ribbon motion at low
speed. This test can also be used to check that the ribbon tracks correctly
through the ribbon path. In addition, the test can be used to check that the
ribbon reverses direction properly.
•
Shuttle
Verifies proper operation by exercising shuttle motion.
5–8
Routine Service and Diagnostics
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