Lexmark 4I3 - Manual (Page 131)

Adjusting the Print Alignment
You can adjust dot registration and print quality for characters
created using bidirectional printing. The bidirectional alignment may
need periodic adjustment to maintain print quality.
To change the bidirectional alignment, follow these steps:
1. If the printer is ready, press Stop.
The printer displays
2. Press Test.
The printer displays
3. Press Scroll or Scroll until the printer displays
4. Press Enter or Start to begin this test.
The printer displays
NOT READY <A>
OPERATOR PRINT TESTS
Printer Demonstration
OPERATOR PRINT TESTS
Bidirectional Adjustment
13 DATA TO PRINT
LOAD FORMS
Chapter 1. Setting Up the 4230 Printer 1-109