HP 4600 Service Manual - Page 353
Jams in tray 1, Table 7-8
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■ Defective paper-tray switches can cause jams by communicating the wrong paper size to the formatter. ■ Defective paper sensors along the paper path might falsely signal a jam. ■ Scraps of media that remain in the paper path can cause intermittent jams. Always check that the paper path is clear when cleaning the printer and when clearing jams. Also, remove the fuser and carefully check it for debris from jams. Jams in tray 1 The following table describes the cause of and solution for jams in tray 1. Table 7-8 Causes for jams in tray 1 Cause The pickup roller is dirty, worn, or damaged. The separation pad is defective. The drive gears are damaged. The multipurpose tray pickup solenoid is defective. Solution Clean the pickup roller. If it is still dirty after cleaning, or if it is worn or damaged, replace the pickup roller. Clean the separation pad. If it is still dirty after cleaning, or if it is worn or damaged, replace the separation pad. Check the drive gears in the paper pickup unit. Replace the pickup drive assembly if the gears are damaged. 1 Disconnect the connector J1020 for the multipurpose tray pickup solenoid from the DC controller PCA. 2 Measure the resistance between the cable-side connectors J1020-11 and J1020-10. 3 If the measured resistance is not about 160 ohms, replace the multipurpose tray pickup solenoid. The pickup motor is defective. The paper pickup assembly is defective. The DC controller PCA is defective. Replace the paper pickup drive assembly. Replace the paper pickup assembly. Replace the DC controller PCA. Calibrate the printer after replacing the DC controller. See Calibrate Now (HP Color LaserJet 4600 models) or Full Calibrate Now (HP Color LaserJet 4610n and 4650 models). Jams in tray 2 The following table describes the cause of and solutions for jams in tray 2. Table 7-9 Causes for jams in tray 2 Cause The separation tabs in the paper cassette are deformed. The pickup roller is worn or damaged. The feed roller is dirty, worn, or damaged. Solution Straighten the tabs on the front corners of the tray, or replace the cassette. Replace the pickup roller. Clean the feed roller. If it is still dirty after cleaning, or if it is worn or damaged, replace the feed roller. ENWW Paper-path troubleshooting 337