Lexmark C510 Service Manual - Page 217

5021-0XX LCD test To run the LCD test: 1. Select LCD Test from the diagnostic menu. The LCD test continually executes the LCD display test. 2. Press Return or Stop to cancel the test. Button test To run the button test: 1. Select Button Test from the diagnostic menu. With no buttons pressed, several OP (Open) appear on the display. 2. Press each button one at a time and a CL (Closed) displays in place of an OP. The proper operation of each button can be checked. 3. Press Return or Stop to cancel the test. 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. Each time the test finishes, the screen is updated with the result (Display shows P:###### for pass and F:###### for fail). 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 and then the fail count increases by one. Sync Busy Error Strobe Interrupt Request Error Byte Interrupt Request Error Init Fall Error Diagnostic aids 3-9