HP LaserJet 4250 Service Manual - Page 385
Jams in tray 1, Table 7-9
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Jams in tray 1 Table 7-9 Causes of tray 1 jams Cause The pickup roller is dirty, worn, or damaged. The separation pad is dirty, worn, or damaged. The drive gears are damaged. The tray 1 pickup solenoid (SL102) is defective. The tray 1 pickup assembly is defective. The dc controller PCA is defective. Damaged gears in the cassette pick-up drive unit. Dirty, worn, or deformed feed roller. Defective feed roller clutch. Solution Clean the pickup roller. If it is dirty after cleaning, or if it is worn or damaged, replace the pickup roller. Clean the separation pad. If it is dirty after cleaning, or if it is worn or damaged, replace the separation pad. Check the drive gears in the tray 1 pickup assembly. Replace the pickup assembly if the gears are damaged. 1 Disconnect the connector for the tray 1 pickup solenoid from the dc controller PCA (location J79). 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 1 pickup solenoid. Replace the tray 1 paper-pickup assembly. See Tray 1 paper-pickup assembly . Replace the dc controller PCA. See Dc controller PCA. 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. Clean the feed roller. If it is dirty after cleaning, or if it is worn or damaged, replace the pickup roller. Disconnect the connector J89. Measure the resistance between the cable side connectors J89-1 and J89-3. If it is not about 145 ohms, replace the feed roller clutch. Paper-path troubleshooting 371