Lexmark C750 Service Manual - Page 206

5060-00x Serial Wrap Test Use this test to check the operation of the Serial Port Hardware using a wrap plug. Each signal is tested. Only displayed if the printer is configured with a standard serial port. If a serial port is available in the PCI slot 1, the Serial 1 Wrap appears. 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: Serial Wrap, Serial 1 Wrap, Serial 2 Wrap, or 3. Serial 3 Wrap. P and F represent the same numbers for DRAM. The power indicator blinks indicating the test is running. This test runs continuously unless canceled by pressing Return or Stop. Each time the test finishes, the screen updates with the result. If the test passes, the Pass Count increases by 1, however if the test fails, one of the following failure messages appears for approximately three seconds and the Fail Count increases by 1: Receive Status Interrupt Error Status Error Receive Data Interrupt Error Transmit Data Interrupt Error Transmit Empty Error Threshold Error Receive Data Ready Error Break Interrupt Error Framing Error Parity Error Overrun Error Data Error Data 232 Error Data 422 Error FIFO Error DSR Error DSR PIO Error DSR Interrupt Error CTS Error CTS PIO Error CTS Interrupt Error Once the maximum count is reached the test stops. The power indicator goes on solid and the final results are displayed. 3-22 Service Manual