HP 4600dn Service Manual - Page 243

Jams in Tray 3 Table 7-8 Causes for jams in Tray 3 Cause Solution Separation tabs in the paper cassette are deformed. Straighten the tabs on the front corners of the tray, or replace the cassette. Pickup roller is worn or damaged. Replace the pickup roller. Feed roller is dirty, worn, or damaged. Clean the feed roller. If it is still dirty after cleaning, or if it is worn or damaged, replace the feed roller. Drive gears are damaged. Check the drive gears in the paper pickup unit. Replace the pickup drive assembly if the gears are damaged. Connector to the printer has poor contact. Reconnect all connectors to the printer. Replace any damaged connectors. Paper feeder pickup solenoid is damaged. 1 Disconnect the connector J4006 for the paper feeder solenoid from the paper feeder PCB. 2 Measure the resistance between the cable-side connectors J4006-2 and J4006-1. 3 If the measured resistance is NOT about 160 ohms, replace the paper feeder pickup solenoid. Pickup motor is defective. Replace the paper pickup drive assembly. Paper feeder PCB is defective. Replace the paper feeder PCB. Paper pickup assembly is defective. Replace the paper pickup assembly. DC controller PCB is defective. Replace the DC controller PCB. Calibrate the printer after replacing the DC controller. See "Calibrate Now" on page 294. C9660-90901 Chapter 7 Troubleshooting 241