HP Color LaserJet CM4730 Service Manual - Page 596
Jams in the paper path, Table 6-6
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Table 6-6 Causes for jams in Tray 4 Cause The separation roller is worn or damaged. The pickup roller is worn or damaged. The feed roller is dirty, worn, or damaged. The gears in the lower pickup drive assembly might be damaged. The tray 4 pickup solenoid (SL8201) is damaged. The tray 4 pickup motor assembly is defective. The tray 4 pickup motor assembly is defective. The lower paper pickup assembly is defective. The DC controller PCB is defective. Solution Clean the separation tab or replace if it is worn. 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. Check the drive gears in the lower pickup drive assembly. Replace the lower pickup drive assembly if the gears are damaged. 1. Run the component test to verify that the solenoid is functioning correctly. If the solenoid does not activate during the test, replace it. 2. Disconnect the connector for the pickup solenoid (J8210) from the paper deck delivery PCB. 3. Measure the resistance between the cable-side connectors J8210-1 and J8210-2. 4. If the measured resistance is not about 160 ohms, replace the cassette pickup solenoid. Replace the tray 4 pickup motor assembly. Replace the tray 4 pickup motor assembly. Replace the lower paper pickup assembly. 1. Upgrade the DC controller firmware by using the RFU process. 2. If necessary, replace the DC controller PCB. Calibrate the MFP after replacing the DC controller. See Calibrate the MFP on page 604. Jams in the paper path The following table describes the cause of and solution for jams in the paper path. Table 6-7 Causes for jams in the paper path Cause Solution The drive gears are damaged. (This applies to jams that occur in advance of the registration roller.) Check the drive gears in the paper pickup unit. Replace the pickup drive assembly if the gears are damaged. The registration roller and registration sub roller are dirty, worn, or damaged. (This applies to jams that occur in advance of the registration roller.) Clean the registration roller or registration sub-roller if it is dirty. If it is still dirty after cleaning, or if it is worn or damaged, replace the paper feed assembly. The media attaching roller (MAR) is damaged. (This applies to jams in which media is crumpled into an accordion when it enters the ETB.) Make sure that the MAR is clean and undamaged. If it is damaged, replace the ETB. Calibrate the MFP after replacing the ETB. See Calibrate the MFP on page 604. 576 Chapter 6 Problem solving ENWW