User`s guide

Troubleshooting Printer Diagnostic - 3
If no error is found, all LEDs come on and two pages print. See
next page for "error-found" configurations.
Note: If the "diagnostic executing" LEDs persist longer than 3
minutes, an unknown error exists.
An "error-found" configuration could indicate a fault anywhere
from the DC controller outward to the module or component. Go to
the topic in Flowcharts that corresponds to the error.