HP Color LaserJet CM4730 Service Manual - Page 652

Troubleshooting the embedded HP Jetdirect print server If network-connection errors occur, you can disable the HP Jetdirect print server in order to determine if the problem is with the print server or with the network. This procedure requires that you temporarily install an optional EIO HP Jetdirect print server card while disabling the embedded HP Jetdirect print server. To disable the embedded HP Jetdirect print server 1. Turn the MFP off and then on. 2. When the memory count appears on the control panel display, press and hold 6 until all three LEDs flash once and then stay on. This might take up to 20 seconds. 3. Release 6, and then press and release 3 until Embedded LAN Disable appears on the control panel display. 4. Press 6 one time, and wait for the MFP to complete its initialization sequence. NOTE: To enable the HP Jetdirect print server again, perform this same procedure. Embedded LAN Enable appears on the control panel display instead of Embedded LAN Disable. Firmware-stack trace In rare instances, you might need to work with a call-center escalation agent to find the source of a 49.XX.XX Printer Error. Use the firmware-stack trace procedure to collect data that the agent might need. A firmware-stack trace indicates which firmware commands were executing at the time of the error. The firmware-stack trace procedure does not produce a report. Instead, you must write down the firmware instructions that appear on the control panel display and relay them to the agent. To perform a firmware-stack trace 1. When the error message appears on the control panel display, press 6 and then press 5. 2. Press 9 to scroll through each line of the firmware-stack trace. 632 Chapter 6 Problem solving ENWW