Lexmark C77X, Service Manual

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Service Manual
5061
POR (Power-On Reset) sequence
The following is an example of the events that occur during the POR sequence for the base machine with no
paper handling options installed.
1.
Power the machine on.
2.
+5 V LED (Power ON) on the system board comes on.
3.
Fans turn on.
4.
The operator panel LED comes on solid.
5.
While loading code, dots scroll across the display.
6.
The following is an example of the screen that displays after the code is loaded.
Where xxx MB displays the installed memory and xxx Mhz indicates the processor speed.
7.
The image of a clock face appears on the display.
8.
The heartbeat LED on system boards turns on.
9.
Color calibration may be initiated. This is displayed if one of the following occurs:
•
The printer detects at power on, or the front cover assembly is closed, that a new or different toner
cartridge has been installed.
•
The printer detects at power on when the cover is closed that a new or different ITU has been
installed.
•
The printer detects at power on that the fuser temperature is below 60° C.
•
When coming out of power saver if power saver has been active for eight hours or longer.
•
If the printer is turned on when a calibration cycle was in progress since the printer was last powered
off.
10.
The redrive exit roller turns.
11.
Ready
is displayed.
Various messages may appear during this sequence or immediately after. For example:
•
ITU Missing
is posted if the ITU is missing.
•
Fuser Missing
is posted if the fuser is missing.
•
Close Door
is posted if the front cover assembly is open.
•
Any cartridge errors are posted such as a defective cartridge, Return Program information, or missing
cartridge.
•
Any applicable maintenance messages display such as
80 Fuser Maintenance or 83 ITU Maintenance
.
•
One of the toner low messages appears when applicable:
88 Yellow Toner Low
,
88 Magenta Toner Low
,
88 Cyan Toner Low
, or
88 Black Toner Low
.
256MB 800Mhz