HP 8000dn Service Manual - Page 450

General Troubleshooting Information Miscellaneous Problems and Solutions The following lists symptoms and typical solutions to those problems. Abnormal noises are evident, such as grinding or chattering when main motor energized. From the EP Area: 1 Replace the toner cartridge. 2 Replace the Main Gear Assembly. See "Main Gear Assembly" on page 191 for instructions. From Tray 2 or 3: 1 Verify proper paper loading, acceptable media. 2 Inspect the "fingers" on the paper trays to ensure proper paper size detection. 3 Replace the Paper Input Unit. See "Paper Input Unit (PIU)" on page 195 for instructions. 4 Replace the Main Gear Assembly. See "Main Gear Assembly" on page 191 for instructions. From 2000-sheet Input Tray: 1 Check the white plastic bushing on Tray 4. The bushing is located on the Tray 4 main drive assembly. The bushing accepts the Tray 4 pilot pin when Tray 4 is closed. Replace if broken. 2 Replace 2000-sheet Input Tray Vertical Transfer Assembly. 3 Replace the 2000-sheet Input Tray Main Drive Assembly. See the HP LaserJet 8000, 8000 N, 8000 DN, and HP Mopier 240 Printers Service Manual Supplement for Paper-handling Accessories for instructions. From Multibin Mailbox: 1 Verify pawls are riding above the output rollers (see figure 7-14 on page 433). 426 Chapter 7 Troubleshooting EN