Power-On Self Test (Post) - Lexmark X422 Laser MFP Service Manual

Power–on self test (POST)
When you turn the MFP on, it performs a Power–On Self Test. With
all the cables connected, the MFP completes POST between 15–20
seconds in the following sequence:
1. The four blue LEDs light and immediately revert to three
illuminated LEDs.
The display shows a series of dots across the screen. The MFP
is performing the memory test.
2. Then, two LEDs are illuminated and the display shows the
amount of installed memory and processor speed (for example,
128MB 300).
3. Next, one LED is illuminated for a moment.
The display message is 'Performing Self Test', the ADF is
tested, the scanner calibrates, and the drive motor and the
printhead motors run.
Note:
•
If non-critical sections of NVRAM, or factory defaults ARE
being restored from the configuration menu, the display
message is 'RESTORING FACTORY DEFAULTS' for a
minimum of three seconds.
•
If the firmware has detected a version change,
'PERFORMING SELT TEST' is displayed for a minimum of
three seconds.
•
If all NVRAM settings are being reset, 'RESETTING ALL OF
NVRAM' is displayed for a minimum of three seconds.
Diagnostic information
7001–001
2-5