HP LaserJet M9040/M9050 Service Manual - Page 315

Troubleshooting by using control-panel messages Ready, Paused, or PowerSave On should appear on the control panel. For information about error messages, see the event log. Event log page Use the event log to diagnose and troubleshoot product errors and intermittent failures. The event log is a last in-first out (LIFO) ordered listing of the last 50 entries. The printed event log includes columns for the event number, the page count, the error code, and the description or personality. The description or personality provides detail about the error messages. The information is useful for troubleshooting. The following items should be listed in the event log. ● Critical errors ● Jams ● Sensors sensing out-of-range conditions ● Deleted jobs ● Unexpected media size ● Complex page ● Buffer overflow ● NVRAM changes ● Diagnostics tests Print the event log The product internal event log stores the 50 most recent events, and can be printed at any time. Use these steps to print the event log: 1. Touch Administration. 2. Scroll, and then touch Troubleshooting. 3. Touch Event Log. 4. Touch Print. Interpret the event log Each individual entry in the log is called an error, while all errors that occur at the same page count are called events. Events usually conclude with a time-out or no response from the product (error 66.XY in the event log). Turn the product off, and then on. ENWW Troubleshooting by using control-panel messages 297