Tandrist,

Don't know if you have tried it yet.  But can you print a configuration page on the machines?  This will rule out if your formatter boards are bad or not.  I guessing this is all software. 

 

Straight from the manual

 

900.xx Error code service check

 

FRU Action

1

 

Printer POR Turn the printer off and on several times. If Error Code 900 continues

to display, go to step 2.

 

 

 

 

 

 

 

 

 

System board Turn the machine off and on several times, waiting a few minutes

between power on and power off.

If Error Code 900 continues to display, go to step 3.

 

 

 

Factory defaults Restore factory defaults. See “Factory Defaults” on page 3-28 3 2

.This resets the non-critical areas of the user NVRAM. If Error Code

900 continues to display, go to step 4.

 

 

 

 

 

Sub error codes With Error Code 900 displayed, press and . Record the

4

“Base

printer sub error codes” on page 2-9

 

 

 

. If none of the Sub Error

Codes are listed, then call your next level of support

 

 

Let me know if you need any other help.  This is a good one.

 

 

 

You can try to follow the official recomendation for this error from Lexmark. It did work for me. My problem was not with the printer, it was with a job stucked on the printer server.

http://support.lexmark.com/index?page=content&id=SO3309&locale=en&userlocale=EN_US

Good luck :emotion-1: