HP Color LaserJet 8500 Service Manual - Page 425

Note Note Drum motor test This test activates the drum motor (M2), imaging drum, transfer drum, and imaging drum waste paddle simultaneously. To view the printer components, run the test with the right upper door open, the transfer drum and imaging drum removed, and the right upper door interlock defeated (see figure 214 on page 425). The engine runs this test for a fixed duration and then stops. For safety reasons, the fuser, high-voltage supplies, and scanner are all turned off during testing. 1 From the Service Mode Menu, press MENU until DRUM MOTOR appears. 2 Press ITEM until REPETITIONS appears. 3 Press - VALUE + to display the possible number of repetitions. 4 Press SELECT to choose the number of repetitions. 5 Press ITEM until EXECUTE TEST appears on the display. 6 Press SELECT to perform the drum motor test. Sensor monitor test This test allows service personnel to activate and deactivate sensors in the printer to verify that the sensors are working properly. For safety reasons, the fuser, high-voltage supplies, and scanner are all turned off during testing. 1 From the Service Mode Menu, press MENU until SENSOR MONITOR appears. 2 Press ITEM until EXECUTE TEST appears on the display. 3 Press SELECT to perform the sensor monitor test. 4 Determine whether each sensor is working by viewing the test results for each sensor on the printer control panel. A single character in the upper line of the display provides a label for each sensor bit. A 0 (off) or 1(on) is displayed for each sensor bit, indicating whether the sensor is activated or deactivated. See table 43 for an explanation of the test results. EN Aids to troubleshooting 423