Lexmark C720 Service Manual - Page 196

5024-001 Parallel Wrap Test This test is used with a wrap plug to check operation of the parallel port hardware. Each parallel signal is tested. To run the parallel wrap test: 1. Disconnect the parallel interface cable and install the wrap plug (P/N 1319128). 2. Select the Parallel Wrap Test from the menu. The power indicator blinks indicating the test is in progress. The test runs continuously until canceled. When the test finishes, the screen updates. If the test passes, the pass count increases by 1, however if the test fails, one of the following messages display for approximately 3 seconds: Sync Busy Error Strobe Interrupt Request Error Init Busy Error Host Busy Error RAM Data AA Error RAM Data 55 Error DMA Address Error DMA Memory Error Clear Init Rise Error Autofeed Rising Interrupt Error False Autofeed Rise Error Clear Autofeed Fall Error Interrupt Request Error Init Fail Error Init Rise Error RAM Data FF Error RAM Data 00 Error DMA Count Error DMA Interrupt Error DMA Background Error False Init Rise Error Clear Autofeed Rise Error Autofeed Falling Interrupt Error Once the maximum count is reached the test stops. The power indicator goes On solid and the final results display. 3. Press Return/Stop to exit the test. ROM Memory Test The ROM memory test is used to check the validity of the system board code and fonts. 3-10 Service Manual