Phaser 4400 Laser Printer Service Manual 2-7Service DiagnosticsThe printerís Service Diagnostics provide the ability to: Print the Service Diagnostics Menu Map. Check the current print engine status. Start the Engine Test Print after selecting the print quantity, the source tray,output tray, and simplex or duplex printing. Test the functionality of printer motors and fans, solenoids, and clutches. Test some portions of drive trains by engaging combinations of motors andclutches or solenoids. Test the functionality of sensors, switches, and options by manually togglingeach sensor or installing an option. Perform NVRAM adjustments essential to the performance of the printer. Check eight different print engine components. Reset the PS NVRAM locations to factory defaults (see Resetting NVRAMon page 4-7).Entering Service DiagnosticsTo enter Service Diagnostics:While turning on power, press and hold Back + Info until the message ìEnteringService Diagnosticsî appears on the display, then release the keys. The ServiceDiagnostics Menu appears.The Service Diagnostic menu has the following selections:General Status ó Provides current print engine status.Engine Test Print ó Starts the test print.Motors/Fans Tests ó Tests the functionality of the printer Motors/Fan.Main Motor + Clutches/Sol Tests ó Tests the functionality of the mainmotor plus clutches or Solenoid at the same time.Sensor Tests ó Tests the functionality of sensors, switches, or the presence ofoptions by manually toggling each sensor or installing an option. Some of the sensortests require cheating the front and/or rear door interlocks.Note: The Service Diagnostics Sensor Tests do not include a checkof the Tray Stack Height Sensor. Refer to the Stack HeightSensor Checkout on page 3-23.Solenoid Tests ó Tests the functionality of printer solenoids.Clutch Tests ó Tests the functionality of printer clutches.Engine NVRAM Adjustments ó Perform NVRAM adjustments essential tothe performance of the printer.
