Lexmark T642 Service Manual - Page 115
xx Error code service check, With Error Code 900 displayed, press - factory reset
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4061-xx0 900.xx Error code service check FRU 1 Printer POR 2 System board 3 Factory defaults 4 Sub error codes Action Turn the printer off and on several times. If Error Code 900 continues to display, go to step 2. 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. Restore factory defaults. See "Factory Defaults" on page 3-28. This resets the non-critical areas of the user NVRAM. If Error Code 900 continues to display, go to step 4. With Error Code 900 displayed, press and . Record the complete list of Sub Error Codes on the display. Check the "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 or call Lexmark. Diagnostic information 2-75
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