HP LaserJet M9040/M9050 Service Manual - Page 344
Service-level diagnostics, Engine test, Service menu - mfp review
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Table 7-4 Service test abnormality codes (continued) Code Description 0142 Side registration guide home-position sensor 0143 OHT sensor 0144 Coil jam sensor FRU Duplexer Registration assembly Fuser assembly Service-level diagnostics Engine test The engine test verifies that the print engine is functioning correctly. This test bypasses the formatter completely and is useful for isolating product problems. The engine test prints a full page of horizontal lines across the printable area. NOTE: Media can be picked up from Tray 2 or Tray 3 if the formatter is installed. If the formatter is removed, open the tray that you do not want to test. Also, make sure that the print cartridge is installed. Service menu The Service menu product commands should be used only by authorized service personnel. It is PIN protected using the following format for the PIN: the first two digits are the month the product was released; the next 4 digits are the product number; the last 2 digits are the year released. You can access the Service menu using PIN code 04904008 for the HP LaserJet M9040 MFPs or 04905008 for the HP LaserJet M9050 MFPs. While in the Service menu, you can perform the following tasks: ● Clear the event log. ● Verify and set the page count and serial number (these appear on the configuration page). ● Change the maintenance intervals. ● Set the cold-reset media size. If a stapler/stacker is installed you can also perform these tasks: ● Calibrate the staple position. ● Review and edit the serial number of the output device. ● Review and edit the page count of the output device. Table 7-5 Service menu Item Explanation Clear event log Clear all events in the product event log. Engine cycle count The engine cycle count, which is stored in NVRAM and displayed on the configuration page, is considered the product mileage. It is the number of pages the formatter has processed not including engine test prints. Certain types of repairs, such as replacement of the controller PCA, can cause this number to be reset. Thus, this number can be configured to ensure that it represents the actual number of product pages processed rather than the number since a repair. 326 Chapter 7 Solve problems ENWW