HP Color LaserJet CM4730 Service Manual - Page 592
Persistent jams, Basic troubleshooting for jams, Data collection, General paper path troubleshooting
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Persistent jams If jams occur repeatedly, use the information in this section to diagnose the root cause of the problem. The tables in this section list possible causes and recommended solutions for jams in each area of the paper path. Items are listed in the order that you should use to investigate. In general, items at the beginning of the list are relatively minor repairs. Items at the end of the list are more complex repairs. Basic troubleshooting for jams Use the following basic troubleshooting process for jams: 1. Gather data. 2. Identify the cause of the problem. 3. Fix the problem. Data collection To troubleshoot jams, gather the following information: ● The exact jam error code that appears on the control panel display ● The location of the leading edge of the media that is in the paper path ● Whether media is in the paper path when the jam occurs or in the input tray ● Whether the jam occurs at power-up or while media is moving ● Whether the media is damaged and, if it is, where the damage occurs on the paper and where in the paper path the sheet stops ● Whether the jam occurs when feeding from one particular tray ● Whether the jam occurs only when using duplex printing ● Whether a particular type of media is jamming or not jamming ● Whether any of the supplies are non-HP (non-HP supplies are known to cause jams) ● Whether the customer is storing the media correctly, overloading the trays, damaging the edge of the media during loading, or using media that has already been fed through the MFP General paper path troubleshooting Use the following suggestions to isolate the cause of the problem. After you have identified the cause, use the tables in this section to find a recommended solution. NOTE: Use the paper path test in the Troubleshooting menu to print pages while troubleshooting. ● View or print the event log and determine if a particular jam error occurs more often than others. Try to identify a pattern. ● Use the event log to determine the frequency of a particular jam. If a jam occurs repeatedly at approximately the same page count, consider it a single jam that the customer tried to clear. 572 Chapter 6 Problem solving ENWW
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