IBM 4230 User Guide - Page 216

Printer Verification You can test general print quality and the wires in the print head by using the Printer Verification test. This test prints nine horizontal lines using each wire on the print head. After these nine lines have printed, several lines of data processing (DP) characters are printed followed by several lines of near letter quality (NLQ) characters. To test print quality, follow these steps: 1. Enter the Operator Print Tests (see "General Test Instructions" on page 5-1). The printer displays OPERATOR PRINT TESTS Printer Demonstration 2. Press Scroll↓ or Scroll↑ until the printer displays OPERATOR PRINT TESTS Printer Verification 3. Press Enter or Start to begin the test. The Ready indicator goes on and printing begins. The verification printout is complete when the Ready indicator goes off. 5-16 User's Guide