Operator Print Tests - IBM 6400 series Maintenance Manual

Operator Print Tests

A set of print tests is included in the configuration menu structure for use as
diagnostic tools. These are called the "Operator Print Tests" because they
are available to the user. You can use these print tests to check the print
quality and basic operation of the printer.
The Operator Print Tests are summarized below.
NOTE: Under the description of some tests is a list of items that may need
Printer Demonstration Prints a sample page showing every print
mode, font, and pitch available in the printer.
Print Error Log Prints the contents of the error log. The error log
automatically records certain unit check conditions in a buffer in NVRAM
that stores up to 50 messages. The most recent message is stored at the
top of the list, the oldest message at the bottom of the list. If more than
50 messages occur before the log is cleared, the oldest messages are
deleted, so that the log never contains more than 50 messages.
Ripple Print A "sliding" alphanumeric pattern useful for identifying
missing or malformed characters, improper vertical alignment, or vertical
compression.
All E's A pattern of all uppercase letter E's useful for identifying missing
characters, misplaced dots, smeared characters, improper phasing, or
light/dark character variations.
All H's A pattern of all uppercase letter H's useful for detecting missing
characters or dots, smeared characters, or improper phasing.
Troubleshooting
to be adjusted or replaced if the test produces a bad print pattern.
The items are listed in the order you should check them: simplest
items first, complex items last.
Hammer bank cover
Hammer spring
Shuttle frame assembly
Ribbon
Splined shaft skew adjustment
Hammer bank cover
MPU sensor
Hammer springs
Hammer coils (shuttle frame assembly)
135