HP LaserJet M9040/M9050 Service Manual - Page 310

General troubleshooting information The following lists symptoms and typical solutions to miscellaneous problems. Abnormal noises are evident, such as grinding or chattering when the main motor is turned on Print cartridge area: ● If the print cartridge is new, automatic seal roll-up will cause noise until seal removal is complete. ● If the print cartridge is not new, replace it. Fuser area: ● Remove and reinstall the fuser. Tray 2 or Tray 3: ● Inspect the fingers to ensure correct paper size detection. Tray 4: ● Verify that the tray is loaded correctly with acceptable media. ● Replace the Tray 4 paper path connection unit (PPCU). ● Replace the Tray 4 main-drive assembly. Media does not feed from Tray X when printing from a software program; the paper-path test is successful ● Verify software media settings. ● Check that the correct media size is loaded from the control panel. ● Tray 2, 3, or 4: Remove and reseat the paper guides in the correct position. ● Verify the correct custom-size-switch setting. Media does not print from Tray 4 ● Verify software media settings. ● Make sure that power is supplied to Tray 4. ● Print a configuration page to make sure that Tray 4 is listed in the paper-handling options section. ● Run a paper-path test from Tray 4. If successful, the paper-size-detection switches might have failed or an incorrect size might be specified in the software program. ● Verify that the custom-size-switch setting is correct. 292 Chapter 7 Solve problems ENWW