HP 2300d Service Manual - Page 231

Note Performing a self test To initiate a self test: 1 Turn off the printer. 2 Press (SELECT) and hold it while turning on the printer. 3 Release (SELECT) when all three status lights are lit. 4 Use (UP arrow) or (DOWN arrow) to scroll to SELF TEST, and then press (SELECT). The status lights cycle, the printer initializes, and then the printer prints a configuration page. Performing a paper path test To initiate a paper path test: 1 Press (SELECT). 2 Use (UP arrow) or (SELECT). (DOWN arrow) to scroll to DIAGNOSTICS, and then press 3 Use (UP arrow) or (SELECT). (DOWN arrow) to scroll to PAPER PATH TEST, and then press 4 Use (UP arrow) or (DOWN arrow) to scroll to PRINT TEST PAGE, and then press (SELECT). The printer produces a test page. Drum-rotation functional check The photosensitive drum, located in the print cartridge, must rotate for the print process to work. The photosensitive drum receives its drive from the main drive assembly. To verify whether the drum is rotating, perform a drum-rotation functional check. To perform a drum-rotation functional check 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 close the top cover. The start-up sequence should rotate the drum enough to move the mark. 5 Open the printer and inspect the gear that was marked in step 3. Verify that the mark moved. If the mark did not move, inspect the main drive assembly to make sure it is meshing with the print cartridge gears. If the drive gears function and the drum does not move, replace the print cartridge. This test is especially important when the customer is using refilled print cartridges. ENWW Chapter 7 Troubleshooting 229