HP LaserJet 9040/9050 Service Manual - Page 231

Service-level diagnostics Note Engine test The engine test verifies that the print engine is functioning correctly. Because the formatter is completely bypassed during an engine test, this test is very useful for isolating printer problems. The engine test prints a full page of horizontal lines across the entire printable area. Media can be picked up from tray 2 or tray 3 if the formatter is installed. If the formatter is removed, the tray that you do not want to print from must be open. Also, make sure that the print cartridge is installed in the printer. Service menu The service menu printer commands should be used only by authorized service personnel. The service menu can only be opened by using the PIN code 00900001 for the HP LaserJet 9000 series printers, 04904005 for the HP LaserJet 9040 series printers, or 09905004 for the HP LaserJet 9050 series printers. While in the service menu, you can perform the following tasks: z Clear the event log z Verify and set the page count and serial number (these appear on the configuration page) z Change the maintenance intervals z Set the cold-reset media size If a stapler/stacker is installed you can also perform these tasks: z Calibrate the staple position z Review and edit the serial number of the output device z Review and edit the page count of the output device Table 23. Service menu Item Explanation Clear event log Clear the event log after maintenance or repairs are complete. Total page count Reset the total page count. Maintenance count Reset the pages since the last maintenance count. Maintenance interval Change or reset the maintenance interval. Serial number Reset the printer serial number. Cold reset paper Set the cold-reset the media size. Stapler/stacker Perform a staple position calibration. Service-level diagnostics 215