Lexmark T620 Service Manual - Page 119

4069-5XX/7XX Output Expander Service Check Service Tip: The majority of the mechanical components can be observed during operation by removing the left, right and system board covers. The output expander functions without the covers installed. Note: Make sure the option is correctly installed before attempting to service the unit. No jumpers should be installed at connector J6 on the output expander board. Problems with excessive static electricity buildup. FRU 1 Output Expander Control Board Cover Action Check the output expander control board cover to make sure the ESD brush ground lead is firmly attached to the output expander frame. Also check to make sure the ESD brush is not loose. Printer does not recognize one or more output expander options as being installed. Service Tip: If more than a single output expander option is installed, check each one to see if the printer recognizes any single option as being installed. If the printer recognizes any of the output expander options then the base printer autoconnect system is operating correctly and the problem is in the unrecognized expander option. Diagnostic Information 2-91