3–27Troubleshooting
Diagnostic Self–Tests
Run diagnostic self–tests to check the print quality and operation of the
printer. The self–tests are listed below.
NOTE: Under the description of each diagnostic test is a list of items that
may require field replacement or adjustment if the test produces a
bad print pattern. Items are listed in the order they should be
checked: simplest items first, moving to more complex components.
• ASCII Swirl A sliding alphanumeric pattern useful for identifying
missing or malformed characters, improper vertical alignment, or
vertical compression.
Hammer bank cover
Hammer spring
Shuttle frame assembly
• All Es A pattern of all uppercase letter Es useful for identifying
missing characters, misplaced dots, smeared characters, improper
phasing, or light/dark character variations.
Ribbon
Splined shaft skew adjustment
Hammer bank cover
MPU sensor
Hammer spring
Hammer coil (shuttle frame assembly)
• Es plus TOF A pattern of all Es followed by a form feed to the
next page top of form, useful for identifying paper motion or feeding
problems.
Hammer bank cover
Power supply PCBA
Mechanism Driver PCBA
Paper motion sensor or cable
Paper feed belt or motor
Splined shaft bearings
Tractors or tractor belts
• All Hs A pattern of all uppercase letter Hs useful for detecting
missing characters or dots, smeared characters, or improper phasing.
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