Appendix A: How to troubleshoot SE 79:04

„Conditions where the problem occurs and conditions prior to the first occurrence of the problem

„The results of the previous 8 steps

„The System Error detailed information (this can be obtained by pressing CANCEL + Down)

„The printer logs. In order to obtain the printer logs, check the corresponding appendix. See Appendix C: Obtaining printer logs on page 2-46.

Front panel displays 79:04 during printer operation – not while sending jobs

1Reboot the printer.

2Upgrade the printer’s firmware. Even if the currently installed firmware version is the latest one, re-install it.

3Reset the printer to factory defaults

4In order to narrow the scope of the issue, try the following: a Disable the queue

b Disable any unused network protocols

c Disable SNMP and WebServices (if they are available in the printer) d Disable “Sleep mode” from the Service Utilities menu

e Delete any Paper Presets that you may have uploaded or created using the printer Spectrophotometer

5Restart the printer in Diagnostics Boot Mode and perform the “Electronics test”. If an electronic component is identified as faulty, replace it.

6Restart the printer in Diagnostics Boot Mode and Reset the EEROM. If the issue is solved by this, this is a data related 79:04 system error and you should follow the guidelines for this type error. See Data related SE79:04 on page 2-35.

7Format the Hard Disk drive. To do so, you will need to start the printer normally, enter the Service Utilities menu and then the Secure Disk Erase option. Set the Erase method to “Fast Erase” and then perform the disk erase process. This will take 45-75 minutes and will erase all user information from the disk, resolving any issue caused by corrupt data. After the erase process, a firmware update will be required. If this solves the issue, this is a data related 79:04 system error and you should follow the guidelines for this type of error. See Data related SE79:04 on page 2-35.

8Try to identify the combination of settings or actions that led to the system error and try to reach the same result with a different combination. Escalate the issue to fix the original problem.

9If none of the previous steps could solve the issue, escalate it with the following information:

„Unit information: S/N, P/N, accessories

„Conditions where the problem occurs and conditions prior to the first occurrence of the problem

„The result of the previous 8 steps

HP Designjet T Series — Service Manual

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