Epson Stylus pro 7900 Repair Manual page 463

Pro 7900 and 9900 Field Repair Guide 10/6/10
3.
5. The utility will display the Printer's serial #.
7. The utility will display this while writing to the Printer.
8. Click on OK to finish.
6. Click on Write to begin.
Note: After the utility displays "complete", wait an
additional 20 seconds before turning off the Printer.
Printer Component, Software Item, LCD Display, Printer Button
NV-RAM BACKUP UTILITY Page 463.