Lexmark 5021-0XX - Manual (Page 209)

Diagnostic aids 3-1
5021-0XX
3. Diagnostic aids
This chapter explains the tests and procedures to identify printer
failures and to verify repairs have corrected the problem.
The following diagnostic aids can be initiated at POR by pressing
certain button sequences. These tests are also available in
diagnostic mode. See
“Diagnostic mode” on page 3-4 , for more
information.
Disabling download emulations
Error Code 964: Download Emulation CRC Failure. Checksum
failure detected in the emulation header or emulation file.
To help resolve Download Emulation problems, the following steps
are necessary to instruct the printer to POR without activating any
download emulations.
To disable the download emulation:
1. Turn the printer off.
2. Press and hold the Select and Return buttons.
3. Turn the printer on and release the buttons once “Performing
Self Test” displays.
After POR completes, the CONFIG Menu is displayed.
4. Select Download Emuls from the menu.
5. Select the Disable Option.
The printer automatically exits the configuration menu and
initializes as if the download emulator were not installed. Once
the printer is idle, a new emulator can be downloaded again.
Note: If you power cycle the printer after selecting the disable
option, the download emulator will be activated.