Xerox 8500DN Service Manual - Page 134

General Troubleshooting Service Diagnostics The printer has built-in diagnostics to aid in troubleshooting. Service Diagnostics provides tests for sensors, motors, switches, clutches, fans and solenoids. Service Diagnostics also contains functions to report printer status and some NVRAM access. Note Tests listed without a typical value range for 8400/8500/8550/8560 models, indicates that no documented typical range exists. Use the test to observe if the system being tested is capable of performing the desired tested action. Service Diagnostics are executed through the Control Panel by a certified service technicians only. Service Diagnostics are invoked one of two ways: Entering Service Diagnostics without a Reboot: This method of entering diagnostics is to allow customers to be diverted to Service Diagnostics in order to perform some tests. 1. Display the Hidden Service Menu as described in "Hidden Service Menu" on page 4-2. 2. Scroll down to Enter Diagnostics and press the OK button. Entering Service Diagnostics by a Reboot (8400): 1. Turn the printer power Off. 2. Press and hold the Back and Help buttons. 3. Turn the power On and hold the Back and Help buttons for approximately 30 seconds until the Control Panel indicates Diagnostic Menu. Entering Service Diagnostics by a Reboot (8500/8550/8560): 1. Turn the printer power On. 2. Wait for the Xerox logo to begin moving across the display. 3. Before the logo is centered on the display (stops moving), press and hold the Back and Help buttons on the Control Panel. 4. Hold both buttons until the display reads Beginning Service Mode Initialization. Release the buttons and the printer reboots into service mode with the Service Diagnostics menu displayed. 4-4 Phaser 8400/8500/8550/8560 Color Printer Service Manual