HP LaserJet Enterprise 600 Service Manual - Page 229
Print/Stop test, Drum rotation test
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Print/Stop test Perform a Print/Stop Test to determine which image-formation component might be malfunctioning. 1. Press the Home button. 2. Open the following menus: ● Administration ● Troubleshooting ● Diagnostic Tests 3. Select the Print/Stop Test item, and then select from a range of 0 to 60,000 milli-seconds. NOTE: Select a range value that allows the page to progress through the paper path just past the component that you suspect is causing the print-quality problem. 4. Press the OK button to start the test. Drum rotation test The photosensitive drum, which is located in the print cartridge, must rotate in order for the print process to work. The photosensitive drum receives its drive from the main gear assembly. Use this procedure to determine whether the drum is rotating. 1. Open the top cover. 2. Remove the print cartridge. 3. Mark the cartridge drive gear with a felt-tipped marker. Note the position of the mark. 4. Install the print cartridge, and then close the top cover. The start-up sequence should rotate the drum enough to move the mark on the gear. 5. Open the product and inspect the mark on the cartridge drive gear. Verify that the mark moved. If there was no movement, inspect the main gear assembly to make sure that it connects with the print-cartridge gears. If the drive gears function but the drum does not move, replace the print cartridge. NOTE: This test is especially important if refilled print cartridges are in use. If a dark and distinct toner image is present on the drum surface, assume that the cleaning, conditioning, writing, and developing functions of the electrophotographic process are functioning correctly. Troubleshoot the failure as a transfer or fusing problem. If no image is present on the drum, perform the drum-rotation test. ENWW Tools for troubleshooting 205
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