Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual page 146

4520-xxx
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 Serial 3 Wrap. P and F
represent the same numbers for DRAM. The power indicator
blinks indicating the test is running.
3. This test runs continuously unless canceled by pressing Return/
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,
a message displays for approximately three seconds and the Fail
Count increases by 1. Once the maximum count is reached the test
stops. The power indicator goes on solid and the final results display.
4. Press Return/Stop to exit the test.
3-14
Service Manual