HP LaserJet 4250 Service Manual - Page 387
Jams in tray 3 or tray 4, Table 7-11
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Jams in tray 3 or tray 4 Table 7-11 Causes of tray 3 and or tray 4 jams Cause The feed or separation rollers are dirty, worn, or damaged. The pickup roller is worn or damaged. The drive transmission gear is damaged. The tray 3 or tray 4 paper pickup drive gears are damaged, or the assembly is defective. The connector to the printer has poor contact. The paper-feeder pickup solenoid is damaged. Solution Clean the rollers. If they are dirty after cleaning, or if they are worn or damaged, replace the rollers. See 500-sheet feed rollers or 1,500-sheet feeder feed rollers, or 1,500-sheet feeder separation roller. Replace the pickup roller. Check the gears, and replace any damaged or worn parts. Check the drive gears in the paper-pickup unit. Replace the pickup drive assembly if the gears are damaged. See 500sheet feeder paper-pickup drive assembly or 1,500-sheet feeder paper-pickup drive assembly. Inspect the connector to the printer. Replace any damaged connectors. 1 Disconnect the connector for the paper-feeder solenoid from the feeder control PCA. 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 paperfeeder pickup solenoid. See 500-sheet feeder switches, sensors, solenoids, and PCAs or 1,500-sheet feeder switches, sensors, solenoids, and PCAs. The tray 3 or tray 4 lifter assembly or stack-position sensor (PS802 or SR2) is defective. The paper-feeder control PCA is defective. The dc controller PCA is defective. Replace the lifter-drive assembly (500-sheet feeder) or the lifter-drive assembly (1,500-sheet feeder). See 500-sheet feeder lifter-drive assembly or 1,500-sheet feeder lifter-drive assembly. Replace the surface stack sensor (PS802 for the 500-sheet feeder, or SR2 for the 1,500-sheet feeder. See 500-sheet feeder switches, sensors, solenoids, and PCAs or 1,500-sheet feeder switches, sensors, solenoids, and PCAs. Replace the paper-feeder control PCA. See 500-sheet feeder control PCA and 1,500-sheet feeder control PCA. Replace the dc controller PCA. See Dc controller PCA. Paper-path troubleshooting 373