Lexmark 302 - Manual (Page 222)

2. Wait 10 seconds, then turn the power On (|).
3. If the printer displays this status code again, call for service.
These status messages are correct display sequences during
power-on, but they should not remain on.
If they remain on more than 30 seconds:
1. Turn the power Off (O).
2. Wait 10 seconds, then turn the power On (|).
3. If the printer displays the same message for more than 30
seconds, call for service.
DIAGNOSTICS IN PROGRESS <A>
DIAGNOSTICS IN PROGRESS <A>
Calibrating Printer <A>
Please Wait
DIAGNOSTICS COMPLETE <A>
B-22 User’s Guide Model 302