HP LaserJet 4250 Service Manual - Page 386

Jams in tray 2 Table 7-10 Causes of tray 2 jams Cause Solution The feed or separation rollers are dirty, worn, or damaged. Clean the rollers. If they are dirty after cleaning, or if they are worn or damaged, replace the rollers. The pickup roller is worn or damaged. The tray 2 paper pickup assembly drive gears are damaged or the assembly is defective. The tray 2 pickup solenoid (SL101) is damaged. Replace the pickup roller. Check the drive gears in the paper pickup drive assembly. Replace the pickup drive assembly if the gears are damaged. See Paper-pickup drive assembly. 1 Disconnect the connector for the tray pickup solenoid from the dc controller PCA (location J92). 2 Measure the resistance between the cable connectors. 3 If the measured resistance is not approximately 160 ohms for the HP LaserJet 4200/4300, or 110 ohms for the HP LaserJet 4250/4350, replace the tray 2 pickup solenoid. The tray 2 lifter-drive assembly or the stack position sensor (PS107) is defective. The dc controller PCA is defective. Dirty, worn, or deformed pick-up roller, cassette separation roller, and cassette feed roller. Damaged gears in the cassette pick-up drive unit. Replace the lifter-drive assembly. See Tray 2 lifter-drive assembly and/or Printer switches and sensors. Replace the dc controller PCA. See Dc controller PCA. Clean the rollers if they are dirty. Replace any worn or deformed rollers. The cassette separation roller and the cassette feed rollare are to be replaced together. Move the gears in the cassette pick up drive unit. If the gears are not rotating correctly, or are damaged or worn, replace the cassette pick-up drive unit. 372 7 Troubleshooting