HEWLETT PACKARD (HP) LJ4000T
Service Manual

Interpret the Event Log
The Event Log is the key tool in troubleshooting printer problems. Figure 7-4 shows a typical Event Log. The Event Log shows the current page count at the top left of the page with the printer�s serial number directly to the right of the page count. The left column is the error sequence number, with the error listed at the top (the highest sequence number is the most recent error logged). The next column is the page count at the time of the error, and the last column is the Personality (PCL or PostScript) column or the cause of the jam at the time of the error. The Event Log may record errors in a different format than the Control Panel Display. For example, if 13.20 PAPER JAM is displayed on the Control Panel, the Event Log records error number 13.32.48 or 13.20.48. Hint Whenever a 13.xx appears on the Control Panel, a good practice is to clear the jammed paper from the printer and print the Event Log. If you cannot print the Event Log, you can still display it on the Control Panel. Write the error next to the last error logged. The last error is the error at the top of the Event Log printout with the highest number in the left-most column. To interpret the Event Log:
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Each individual entry in the log is called an �error,� while all errors occurring at the same page count are called an �event.� Read the Recommended Action for each error comprising an event to gain a clear picture of what took place during that event. Events usually conclude with a time-out, or no response from device (error 66.xx in the Event Log) which requires a power cycle of the print engine. Use the Event Log table in this section to associate errors in the Event Log with the Control Panel error message. Follow the Recommended Action listed in the table for each error or event.

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7-16 Troubleshooting

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