Xerox 4400DT Service Manual - Page 44
Service Diagnostics, Entering Service Diagnostics
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Service Diagnostics The printer's Service Diagnostics provide the ability to: I Print the Service Diagnostics Menu Map. I Check the current print engine status. I Start the Engine Test Print after selecting the print quantity, the source tray, output tray, and simplex or duplex printing. I Test the functionality of printer motors and fans, solenoids, and clutches. I Test some portions of drive trains by engaging combinations of motors and clutches or solenoids. I Test the functionality of sensors, switches, and options by manually toggling each sensor or installing an option. I Perform NVRAM adjustments essential to the performance of the printer. I Check eight different print engine components. I Reset the PS NVRAM locations to factory defaults (see Resetting NVRAM on page 4-7). Entering Service Diagnostics To enter Service Diagnostics: While turning on power, press and hold Back + Info until the message "Entering Service Diagnostics" appears on the display, then release the keys. The Service Diagnostics Menu appears. The Service Diagnostic menu has the following selections: General Status - Provides current print engine status. Engine Test Print - Starts the test print. Motors/Fans Tests - Tests the functionality of the printer Motors/Fan. Main Motor + Clutches/Sol Tests - Tests the functionality of the main motor plus clutches or Solenoid at the same time. Sensor Tests - Tests the functionality of sensors, switches, or the presence of options by manually toggling each sensor or installing an option. Some of the sensor tests require cheating the front and/or rear door interlocks. Note: The Service Diagnostics Sensor Tests do not include a check of the Tray Stack Height Sensor. Refer to the Stack Height Sensor Checkout on page 3-23. Solenoid Tests - Tests the functionality of printer solenoids. Clutch Tests - Tests the functionality of printer clutches. Engine NVRAM Adjustments - Perform NVRAM adjustments essential to the performance of the printer. Phaser 4400 Laser Printer Service Manual 2-7