HP LaserJet 6p/mp Service Manual - Page 46

Continuous self test Note The HP LaserJet 6L Pro does not support the continuous self test. A continuous self test can be useful for troubleshooting paper path and other problems. To print a continuous self test: 1 Disconnect the printer from the power source. 2 Press and hold down the Control Panel Button while connecting power. 3 Continue holding the button for about five seconds. All lights will illuminate at once, then each will light in sequence. 4 Release the button. The printer conducts its internal diagnostics routine, then prints the self-test page continuously until stopped. 5 To stop the continuous self test (and reset the printer), press and hold the Control Panel Button for a few seconds until all lights begin lighting in sequence once again. Note The self test does not print at the printer's rated speed of 4 ppm (HP LaserJet 5L) or 6 ppm (HP LaserJet 6L). The engine test prints at the printer's rated speed. Printing an engine test Note The engine test print can be used to verify that the print engine is functioning correctly. The Formatter PCA is completely bypassed during an engine test. Consequently, this test is useful for isolating engine printer problems. For the HP LaserJet 5L and 6L printers, the engine test prints a full page of vertical lines down the entire printable area. For the HP LaserJet 6L Pro, the engine test prints a full page of horizontal lines across the entire printable area. These engine test pages are useful for checking and adjusting registration. Perform the engine test with the printer covers in place, as shown in Figure 3-6. Refer to "Engine Test" in Chapter 7 for the engine test procedure. Engine test printout Engine test printout Engine test button (5L/6L) (6L Pro) Figure 3-4 Engine test button 44 Operating overview EN