HP 4600dn Service Manual - Page 287
Engine diagnostics, Diagnostics mode
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Note Engine diagnostics This section provides an overview of the engine diagnostics incorporated into the HP Color LaserJet 4600 series printer. The printer contains extensive internal diagnostics that help in troubleshooting print quality issues, paper path issues, noise issues, component issues, and timing issues. Diagnostics mode Some of the diagnostic tests automatically put the printer into a special diagnostics mode. The special diagnostics mode allows the printer to perform actions that it normally could not because the printer would enter an error state. Always follow the control panel directions in the Diagnostic menu to properly exit the special diagnostics mode and return the printer to a normal state. Diagnostics that put the engine into the special diagnostics mode There are three diagnostic tests that put the engine into a special state: q Disable cartridge check q Sensor test q Component test While the printer is in the special diagnostics mode, the display should read: Ready Diagnostics Mode To exit press Cancel Job When the printer is in the special diagnostics mode, the three tests listed above appear in the menu and are available to be run. To access other diagnostic tests or to leave the special state, press the CANCEL JOB button, and then select Exit diagnostics. The printer will reset itself, and then return to the normal state. A good understanding of how the printer operates is required to use the engine diagnostics successfully. Before proceeding with these diagnostic tests, be sure you understand the information in Chapter 5 of this manual. C9660-90901 Chapter 7 Troubleshooting 285