Lexmark C510 Service Manual - Page 219

5021-0XX Once the maximum pass or fail count is reached, the test stops and the final results display on the screen. DRAM memory test The purpose of this test is to check the validity of DRAM, both standard and optional. The test writes patterns of data to DRAM to verify that each bit in memory can be set and read correctly. To run the DRAM memory test: 1. Select DRAM Test from the menu. The power indicator blinks indicating the test is in progress. 2. If you need to stop the test before it finishes, turn the printer off. P:###### represents the number of times the memory test has passed and finished successfully. Initially 000000 displays with the maximum pass count being 999,999. F:##### represents the time the memory test has failed and finished with errors. Initially 00000 displays with the maximum fail count being 99,999. Once the maximum pass count or fail count is reached, the test stops, and the final results display. If the test fails, the message DRAM error, displays for approximately three seconds and the fail count increases by 1. Serial wrap test This test is used to check the operation of the serial port hardware using a wrap plug. Each signal is tested. To run the serial wrap test: 1. Disconnect the serial interface cable and install the wrap plug. 2. Select the appropriate Serial Wrap Test from the menu. The following screen displays: serial X wrap P:###### F:###### • X indicates which serial port is being tested, blank = standard 1 = optional serial port #1 2 = optional serial port #2 Diagnostic aids 3-11