HP 2420 Service Manual - Page 180

Test pages Printing test pages helps you determine whether or not the printer engine and the formatter are functioning. NOTE Engine-test page To verify that the printer engine is functioning, print an engine-test page. To print an enginetest page, press the engine-test-page switch on the formatter (see callout 5 in Figure 7-8. Sensors and switches, HP LaserJet 2400 series). The test page should have a series of vertical lines. The test page prints from the last tray that you used to print unless the printer has been turned off, and then turned on again since the most recent print job. If the printer has been turned off and then on again since the most recent print job, then the page will print from tray 2. The printer will continuously print test pages as long as the test-page switch is depressed. The printer will not print a test page if it is in Sleep mode. A damaged formatter might interfere with the engine test. If the engine test page does not print, try removing the formatter and performing the engine test again. If the engine test is then successful, the problem is in the formatter, the control panel, or the cable that connects them. Formatter test page To verify that the formatter is functioning, print a configuration. 1. Press the SELECT ( ) button to open the menus. 2. Press the DOWN ARROW ( ) button to scroll to INFORMATION. 3. Press the SELECT ( ) button to select INFORMATION. 4. Press the DOWN ARROW ( ) button to scroll to PRINT CONFIGURATION. 5. Press the SELECT ( ) button to select PRINT CONFIGURATION. 166 Chapter 7 Troubleshooting ENWW