HP LaserJet Pro 300 Service Manual - Page 30

Service approach Before performing service ● Remove all media from the product. ● Turn off the power using the power button. ● Unplug the power cable and interface cable or cables. ● Place the product on an ESD mat (if available). If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part. ● Remove the toner cartridges. ● Remove the Tray 2 cassette. After performing service ● Connect the interface cables, and then plug in the power cable. ● Reinstall the toner cartridges. ● Reinstall the Tray 2 cassette. Post-service test After service has been completed, perform the following test to verify that the repair or replacement was successful. Print-quality test 1. Verify that you have completed the necessary reassembly steps. 2. Make sure that the input tray contains clean, unmarked paper. 3. Attach the power cord and interface cable, and then turn on the product. 4. Verify that the expected startup sounds occur. 5. Print a configuration page, and then verify that the expected printing sounds occur. 6. Use the control-panel menus to calibrate the product. 7. Print a diagnostic page, and then verify that the print quality is as expected. 8. Send a print job from the host computer, and then verify that the output meets expectations. 9. If necessary, restore any customer-specified settings. 10. Clean the outside of the product with a damp cloth. 6 Chapter 1 Removal and replacement ENWW