Specifications

Additional Procedures Printer Tests - 19
Interpreting the Final Test Page (continued)
• Bi-Directional Test Pattern: The seven sets of five vertical lines test bi-directional printing.
One of the middle five sets should have almost no horizontal offset between the sections of
the lines. Offset can be caused by the incorrect assembly, encoder strip (or bent encoder
spring), carriage motor, or drive belt.
• Line Feed Pattern : The long, thick vertical bar on the left of the page tests line feed.
Prominent horizontal white lines or dark spaces in this bar indicate line feed problems which
may be caused by the paper motor or mechanical assembly. This test is intended to find gross
line feed errors, which result in either small white breaks/lines or dark lines/bands in the print
pattern.