Lexmark C912 Service Manual - Page 166

5055-xxx Serial Wrap Tests The Serial Wrap Test checks each signal of the serial port hardware using a wrap plug. To perform the wrap test: 1. Disconnect the serial interface cable, and install the serial wrap plug. 2. Select HARDWARE TESTS from the Diagnostics Menu. 3. Select the appropriate Serial Wrap Test (Serial Wrap, Serial 1 Wrap). The printer begins testing the serial hardware and the following message is displayed: Serial X Wrap P:##### F:##### Terminology: x indicates which serial port is being tested (blank=standard serial, 1=optional serial port #1). P:###### represents the number of times the memory test finishes successfully. Initially 000000 displays for ######. The maximum pass count is 999,999. F:##### represents the number of times the memory test finishes with errors. Initially 00000 displays for #####. The maximum fail count is 99,999. The power indicator blinks indicating the memory test is in process. The printer runs this test continually. The test can be terminated by powering off the printer. Each time the test finishes, the screen is updated with the result. If the test is successful, the Pass Count increments by 1. If the test fails, a failure message displays for approximately three seconds and the Fail Count increments by 1. 3-16 Service Manual