900 Error Code service check
1 Printer POR
Turn the printer off and on several times. If Error Code 900 continues
to display, go to step 2.
2 System board
Make sure the system board is properly seated in connector J7 on
the interconnect 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.
3 Factory defaults
Restore factory defaults. See “Restore EP Factory Defaults” on
page 3-18. This resets the non-critical areas of the user NVRAM. If
Error Code 900 continues to display, go to step 4.
4 Sub error codes
With Error Code 900 displayed, press Select and Return. Record the
complete list of Sub Error Codes on the display. Check the “Base
printer sub error codes” on page 2-6. If none of the Sub Error
Codes are listed, then call your next level of support.
From page 2-41 of IBM's service Guide
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