Alternately, you can also use the PC diagnostics to selectively return either the
print engine NVRAM contents or the PostScript NVRAM contents to their factory
default values as shown in the following illustrations.
Running Reset PE NVRAM to Default or Clear PS NVRAM downloads a file to
the printer that performs the indicated reset function; there is no confirmation or
cancel function.
Resetting print engine NVRAM menu item
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Phaser 840 and 850 Color Printers