Lexmark E320 Service Manual - Page 145

4500-E320/E322 Diagnostic tests mode The diagnostic tests mode causes the printers internal tests to be performed. If any of the diagnostic tests fail, a service indication is posted. You can determine which test failed by accessing the service code associated with the service error. The secondary service code is displayed by performing a button press while the service indication is posted on the operator panel. If the printer completes all its diagnostic tests successfully, the Toner Low light blinks. To exit diagnostics, turn off the printer. While running diagnostics, the printer performs the following tests: • Standard memory test • Optional memory test When the printer enters Normal or Demo modes, the total amount of installed memory detected during the POST sequence is compared with an NVRAM value representing the printer total installed memory. • If the amount of detected memory matches the value stored in NVRAM, the printer doesn't perform a Memory Test during POST sequence into Normal or Demo modes. • If the amount of detected memory does not match the NVRAM value representing total installed memory, the printer assumes the user has changed the printers memory configuration by adding or removing optional memory. To verify the new memory configuration, the printer performs a full Memory Test and then updates the NVRAM value representing the total installed memory. Note: The printer always performs a complete Memory Test when executing the Diagnostics Test. Diagnostic aids 3-9