HP Color LaserJet CM4730 Service Manual - Page 597
Jams in the right upper cover
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Table 6-7 Causes for jams in the paper path (continued) Cause Solution The cartridge shutter open/close mechanism is damaged. (This applies to jams in which media is crumpled into an accordion fold somewhere on the ETB belt.) The shutters in each print cartridge should open as you close the ETB. If a shutter does not open, replace that print cartridge. Also check for a damaged shutter mechanism in the MFP. The cartridge drive motor assembly is damaged. 1. Run the component test to verify that all cartridge motors are functioning correctly. Replace any defective drum drive motors. 2. Inspect the main drive assembly. If it is damaged, replace it. The top of page sensor (SR12) is defective. Replace the paper feed assembly. The DC controller PCB is defective. 1. Upgrade the DC controller firmware by using the RFU process. 2. Replace the DC controller PCB. Calibrate the MFP after replacing the DC controller. See Calibrate the MFP on page 604. Jams in the right upper cover The following table describes the causes of and solutions for jams in the right upper cover. Table 6-8 Causes for jams in the right upper cover Cause Solution The fuser paper sensor (SR1) or sensor lever is defective. 1. Make sure that the fuser paper sensor lever moves smoothly and is in place. 2. Run the component test. 3. Replace the sensor if it is defective. The fuser sleeve or pressure roller does not rotate smoothly. If the fuser drive gears are worn or damaged, replace the fuser. The fuser inlet guide is dirty or is covered with toner. Clean the fuser inlet guide. The fuser sleeve or pressure roller is dirty, worn, or damaged. Clean the fuser sleeve or pressure roller. If it is damaged, replace the fuser. The fuser pressure release motor is damaged. Run the component test. If the motor fails, replace it. The delivery tray paper-full sensor (SR2) or sensor lever is defective. 1. Make sure that the delivery paper-full sensor lever moves smoothly and is set in place. Replace the lever if it is damaged. 2. Run the component test. 3. Replace the sensor if it is defective. The fuser delivery roller is worn. Replace the fuser. The fuser delivery roller drive gears are worn or damaged. Replace the fuser. The face-down delivery roller is defective. Replace the fuser. ENWW Paper path troubleshooting 577